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    Wyświetlanie 1-36 z 36
    Tytuł:
    CFD modelling of turbine stage stator/rotor interaction
    Autorzy:
    Świdyrczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955217.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska
    Tematy:
    stator wakes
    grid resolution
    vortices
    Opis:
    Issues related to numerical analyses of turbine stage stator/rotor interactions are disceussed, with special focus on the selection of grid parameters to secure proper modelling of the stator wake's dissipation. Unsteady calculations of the flow through a high-pressure turbine stage, based on 3D ORANS equations, are employed in the grid resolution analysis. Their results are compared with those obtained with other methods, both developed by the author or available in the literature. As a result, the 3D grid resolution of the order of 2000000 cells per one stator and/or one rotor passage has been determined as the necessary minimum for properly modelling the dissipation of the stator's wake on its war through the rotor's cascade, under the circumstances determined by the used CFD code. A generalization of this result is proposed.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 2; 113-124
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of vortex structures in a turbine stage rotor passage
    Autorzy:
    Świdryczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943253.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska
    Tematy:
    turbine stage
    CFD analysis
    vortex structures
    Opis:
    The article analyses the formation and development of horseshoe vortices in a highpressure turbine stage rotor passage. Two turbine stages are examined: a standard performance stage, revealing regular performance characteristics and distributions of flow parameters, and a lowefficiency stage in which a large separation zone is observed in rotor passages. In the latter stage the interaction of the hub horseshoe vortex with the separation structures has been found to take a highly unsteady and periodic course and be a source of remarkable flow fluctuations.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2008, 12, 3-4; 147-158
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Obtaining fluid flow pattern for turbine stage with neural model
    Autorzy:
    Butterweck, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2073533.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    turbine
    diagnostics
    neural model
    pattern
    fluid flow
    Opis:
    In the paper possibility of applying neural model to obtaining patterns of proper operation for fluid flow in turbine stagefor fluid-flow diagnostics is discussed. Main differences between Computational Fluid Dynamics (CFD) solvers and neural model is given, also limitations and advantages of both are considered. Time of calculations of both methods was given, also possibilities of shortening that time with preserving the accuracy of the calculations are discussed. Gathering training data set and neural networks architecture is presented in detail. Range of work of neural model was given. Required input data for neural model and reason why it is different than in computational fluid dynamics solvers isexplained. Results obtained with neural model in 21 tests are discussed. Arithmetic mean and median of relative errors of recreating distribution of pressure and temperature are shown. Achieved results are analysed.
    Źródło:
    Journal of Polish CIMEEAC; 2019, 14, 1; 45--50
    1231-3998
    Pojawia się w:
    Journal of Polish CIMEEAC
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Steam turbine stage modernisation in front of the extraction point
    Autorzy:
    Szymaniak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260514.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    turbine stages
    leakages
    extraction point
    axial flow turbines
    Opis:
    The paper presents modernisation of the steam turbine stage situated in front of the turbine extraction point, based on a 225 MW turbine LP stage as an example. The modernised design is intended to better control the steam flow in this area. In the presented design a special ring is used to drive the steam leakage flow directly to the heat exchanger. The performed experiments and numerical analyses confirmed measurable exploitation and efficiency advantages of the introduced modernisation. So far, it has been successfully applied in a number of turbines working in inland power plants, but its use can be easily extended, without need for further modification and without advantage loss, to marine turbines, especially those used as main propulsion in sea-going vessels.
    Źródło:
    Polish Maritime Research; 2018, 2; 116-122
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unsteady performance of an HP turbine stage optimised for steady flow conditions
    Autorzy:
    Świrdyczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964172.pdf
    Data publikacji:
    2005
    Wydawca:
    Politechnika Gdańska
    Tematy:
    turbine stage
    blade optimisation
    unsteady effects
    Opis:
    The article is focused on the examination of the unsteady performance of an HP turbine stage the blades of which were previously optimised for steady flow conditions. For the purpose of this examination, two pairs of initial and optimised stages of comparable output parameters were selected. The results have revealed that the modification of the blade profile in the optimisation process made the rotor blades more vulnerable to unsteady flow fluctuations, which eventually cancelled a considerable part of the stage efficiency gained from the steady flow optimisation.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 2; 187-198
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of the turbulence model on the turbine stage flow exit angle distribuation
    Autorzy:
    Świrydczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933955.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska
    Tematy:
    turbine stage
    turbulence model
    flow exit angle
    Opis:
    The article analyses the effect of the turbulence model on the calculated exit angles of the flow leaving the rotor of a low-pressure turbine stage. Three turbulence models were taken into account: the algebraic Baldwin-Lomax model and two advanced differential models based on the Shear Stress Transport (SST) approach proposed by Menter. The calculated results have revealed that even such extremely different turbulence models impose little difference in the resultant averaged flow exit angle distributions, especially in stages in which a regular flow pattern without flow separation and/or other irregularities is observed. Larger differences can be observed in local distributions of this parameter, especially in the regions of activity of secondary vortex structures.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2012, 16, 3-4; 239-252
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the internal efficienty of a turbine stage: classical and computational fuid dynamics definitions
    Autorzy:
    Nastałek, L.
    Karcz, M.
    Sławiński, D.
    Zakrzewski, W.
    Ziółkowski, P.
    Szyrejko, C.
    Topolski, J.
    Werner, B.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175251.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    turbine stage
    stage power
    stage efficiency
    losses
    Opis:
    Almost entire fleet of steam turbines in Poland was designed between 1950_1980 with the use of the so-called zero-dimensional (0D) calculation tools. For several years, design and modernization of the turbines occur in assistance with the state-of-the-art methods that describe working fluid flow field based on three-dimensional (3D) models and computational fluid dynamics (CFD) codes. This cooperation between 0D and 3D codes requires exchange of overall, integral information such as: power, efficiency, heat and mass fluxes. In consequence the question arises regarding the cohesion of definitions, and particularly regarding the correctness of the definition for internal efficiency of the turbine's stage and the turbine as a whole. In the present paper we formulate basic definitions reason of efficiency that are naturally adapted to the numerical 0D and 3D models. We show that the main reason of differences between the definitions in 0D and 3D is the definition of the theoretical work of the stage lt. In the classical 0D models, mostly employed is the isentropic approach, and hence the isentropic efficiency occurs. Meanwhile, in the increasingly common 3D approach (most likely by CFD), we use more physically correct pathway by subtracting energy loss from the available energy, that leads to the polytropic definition of efficiency. We show an example of computing the efficiency and the 3D losses, denoted with additional subscript CFD, we also discuss benefits of this definition in comparison with the isentropic classical definition in 0D.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 17-39
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proposal of modernisation of a steam turbine stage before extraction, CFD and CSD analysis
    Autorzy:
    Gardzielewicz, A.
    Karcz, M.
    Marcinkowski, S.
    Bielecki, M.
    Badur, J.
    Malec, A.
    Banaszkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931599.pdf
    Data publikacji:
    2002
    Wydawca:
    Politechnika Gdańska
    Tematy:
    steam turbine stage
    flow and stress optimisation
    Opis:
    The paper presents an idea and analysis of application of a new solution of a stage before extraction in the modernised LP part of 200MW turbines with ND exhaust. The idea of the patent is to introduce to the turbine steam path a ring directing high energy tip leakage steam from the stage to the regenerative extraction. Owing to this it is possible to cheaply achieve some energy benefits from the operation of first heat exchanger which in the modernised 200MW turbine is continuously underheated. Ring design has been checked using CFD and CSD numerical codes.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 4; 577-589
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of an impulse and a reaction turbine stage for an ORC power plant
    Autorzy:
    Zaniewski, Dawid
    Klimaszewski, Piotr
    Witanowski, Łukasz
    Jędzejewski, Łukasz
    Klonowicz, Piotr
    Lampart, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/240056.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CFD
    waste heat recovery
    steam turbine
    organic Rankine cycle
    ciepło odpadowe
    odzysk ciepła
    ORC
    organiczny cykl Rankine'a
    Opis:
    Turbine stages can be divided into two types: impulse stages and reaction stages. The advantages of one type over the second one are generally known based on the basic physics of turbine stage. In this paper these differences between mentioned two types of turbines were indicated on the example of single stage turbines dedicated to work in organic Rankine cycle (ORC) power systems. The turbines for two ORC cases were analysed: the plant generating up to 30 kW and up to 300 kW of net electric power, respectively. Mentioned ORC systems operate with different working fluids: DMC (dimethyl carbonate) for the 30 kW power plant and MM (hexamethyldisiloxane) for the 300 kW power plant. The turbines were compared according to three major issues: thermodynamic and aerodynamic performance, mechanical and manufacturing aspects. The analysis was performed by means of the 0D turbomachinery theory and 3D computational aerodynamic calculations. As a result of this analysis, the paper indicates conclusions which type of turbine is a recommended choice to use in ORC systems taking into account the features of these systems.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 3; 137-157
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Secondary flow structures and resultant exit flow angle fluctuations in high pressure steam turbine stage
    Autorzy:
    Świdryczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943184.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska
    Tematy:
    turbine stage
    vortices
    exit flow angle
    Opis:
    The object of investigation is the stage, the geometry and flow conditions of which are typical for a series of steam turbines in operation in Polish power plants. The flow analysis is based on the CFD calculations performed using FlowER, a specialized URANS code developed for studying unsteady phenomena in turbine stages and sections. The paper presents flow patterns illustrating the interaction between vortices inside and downstream of the rotor passage and the resultant exit flow angle (EFA) fluctuations recorded at the stage exit. An attempt is made to attribute individual EFA fluctuations to particular vortices and their development stages.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2010, 14, 1-2; 15-28
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of Baumann’s turbine stage operation. Part I - Flow
    Modelowanie pracy turbinowego stopnia Baumanna, część I - przepływ
    Autorzy:
    Zakrzewski, W.
    Nastałek, L.
    Badur, J.
    Jesionek, K.
    Straś, K.
    Masłyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/172821.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    turbina kondensacyjna
    stopień Baumanna
    symulacja komputerowa
    condensing turbine
    Baumann's stage
    computer simulation
    Opis:
    A Baumann stage is one of the way, to increase the turbine’s output without an increase of the last stage blade length. Due to the complicated design, the Baumann’s blade technology is complex, and its efficiency is lower in comparison to a free-standing blade. Currently that stage is used mostly in back pressure cogeneration heating turbines. This paper presents the operation of low pressure part steam turbine in different conditions, calculated with two models of steam and compared to measurements and TURBINA 0D code.
    W pracy nawiązano do stopnia Baumanna i całej części niskoprężnej turbiny kondensacyjnej typu 13K215, w której występują różnice między pomiarami a danymi projektowymi określonymi na podstawie klasycznych narzędzi obliczeniowych typu „0D TURBINA”. Dlatego celem artykułu jest próba wyjaśnienia tych różnic poprzez, dokładniejszą niż 0D, symulację 3D przepływu kondensującej pary w części niskoprężnej turbiny.
    Źródło:
    Archiwum Energetyki; 2012, 42, 2; 175-183
    0066-684X
    Pojawia się w:
    Archiwum Energetyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modernisation of steam turbine construction at regenerative steam extraction point
    Autorzy:
    Szymaniak, M.
    Gardzilewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955313.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska
    Tematy:
    modernization
    turbine stage
    extraction point
    leakage
    Opis:
    The paper presents a methodology which has led to improvement of the turbine stage performance in the regenerative steam extraction chamber area by introducing a ring which collects the leakage flow from the gaps over unshrouded rotor blade tips and directs it to the extraction chamber. A comparison is made between the results obtained for the initial design (without a ring) and the design with the ring mounted. The results obtained for the construction were calibrated using the data measured on a real turbine in a Polish power plant.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2010, 14, 4; 319-327
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Turbine stage expansion model including internal air film cooling and novel method of calculating theoretical power of a cooled stage
    Autorzy:
    Trawiński, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/2134930.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas turbine
    expansion line
    air film cooling
    theoretical stage power
    Opis:
    Systematic attempts to maximise the efficiency of gas turbine units are achieved, among other possibilities, by increasing the temperature at the inlet to the expansion section. This requires additional technological solutions in advanced systems for cooling the blade rows with air extracted from the compressor section. This paper introduces a new mathematical model describing the expansion process of the working medium in the turbine stage with air film cooling. The model includes temperature and pressure losses caused by the mixing of cooling air in the path of hot exhaust gases. The improvement of the accuracy of the expansion process mathematical description, compared with the currently used models, is achieved by introducing an additional empirical coefficient estimating the distribution of the cooling air along the profile of the turbine blade. The new approach to determine the theoretical power of a cooled turbine stage is also presented. The model is based on the application of three conservation laws: mass, energy and momentum. The advantage of the proposed approach is the inclusion of variable thermodynamic parameters of the cooling medium. The results were compared with the simplified models used in the literature: separate Hartsel expansion, mainstream pressure, weighted-average pressure and fully reversible. The proposed model for expansion and the determination of theoretical power allows for accurate modelling of the performance of a cooled turbine stage under varying conditions.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 3; 3--27
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adjustable (rotated) stator blade aerodynamics in adaptive control of extraction/condensing turbines
    Autorzy:
    Lampart, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/175580.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    LP turbine
    turbine stage group
    adaptive control
    Opis:
    Cogeneration of electric energy and heat as well as seasonal changes of the condenser pressure in low-pressure extraction/condensing turbines require adaptive control to adapt the geometry of the blading system to the changing flow conditions. In this paper adaptive control is achieved by means of restaggering (rotating) adjustable stator blades. An increase of turbine efficiency and power coming from adaptive control is numerically estimated for a group of two exit stages of an extraction/condensing turbine of power 60 MW. The calculations are made with the help of a computer code FlowER – a 3D solver of turbomachinery flows based on Reynolds-averaged Navier-Stokes equations for perfect gas.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2018, 141; 41-52
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda obliczeń parametrów stopnia turbiny chłodzonej w projekcie koncepcyjnym zespołu
    Method for calculation of cooled turbine stage parameters in the conceptual design of unit
    Autorzy:
    Antas, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/2204383.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    turbina osiowa
    metoda obliczeń
    stopień chłodzony
    axial flow turbine
    method for calculation
    cooled stage
    Opis:
    W pracy przedstawiono podstawowe rodzaje układów chłodzenia turbin lotniczych silników przepływowych oraz zasadnicze metody chłodzenia łopatek wieńców stopnia turbiny. W głównej części artykułu zaprezentowano metodę wyznaczania parametrów strumienia w przekrojach wyjściowych wieńców stopnia turbiny chłodzonej, polegającej na wykonaniu w pierwszym etapie obliczeń parametrów termicznych i kinematycznych strumienia oraz geometrycznych na średnicy średniej w stopniu niechłodzonym. Drugi etap metody obejmuje korektę parametrów spalin oraz parametrów geometrycznych profili wieńca dyszowego i wirnikowego w stopniu chłodzonym. Metoda może być stosowana w trakcie realizacji projektu koncepcyjnego stopnia osiowej turbiny chłodzonej, a oparto ją na równaniu zachowania energii, równaniu ciągłości przepływu, równaniu Eulera, pierwszej zasadzie termodynamiki oraz definicjach współczynników używanych w teorii maszyn wirnikowych. Końcowa część pracy zawiera zalecenia dotyczące parametrów geometrycznych profili wieńców chłodzonych oraz wnioski.
    The paper presents the basic types of turbine cooling systems for aircraft turbine engines as well as the essential methods of cooling turbine rim blades. The main part of the article presents the method of determining the stream parameters in the cross - sections of the output rims of the cooled turbine stage, consisting in the first stage of calculations of thermal and kinematic parameters for the stream and geometric parameters on the mean diameter in the uncooled stage. The second stage of the method includes the correction of the exhaust gas parameters and the geometric parameters of the profiles for the nozzle and rotor rim in a cooled stage. The method can be used during the conceptual design of the axial cooled turbine stage and is based on the energy conservation equation, the Euler’s moment of momentum equation, the first law of thermodynamics and definitions of the coefficients used in the theory of turbomachinery. The final part of the work includes recommendations regarding the geometric parameters of the cooled rim profiles and conclusions.
    Źródło:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2022, z. 94; 5--22
    0209-2689
    2300-5211
    Pojawia się w:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of the steam flow past the turbine blade stage
    Autorzy:
    Rogowski, K.
    Pawlicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/99392.pdf
    Data publikacji:
    2017
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    computational fluid dynamics
    steam turbine
    turbulence model
    Opis:
    The steam flow past a last stage (the eleventh stage) of the high pressure part of the TK120 steam turbine was investigated using computational fluid dynamics (CFD). The simulations are performed using the unsteady compressible Navier-Stokes equations. Viscous steam flow has been analyzed using the Spalart-Allmaras turbulence model. The paper presents distributions of instantaneous flow parameters around turbine blades as well as instantaneous aerodynamic blade loads. Flow parameters such as: velocity and static pressure are presented as contour maps whereas aerodynamic loads, axial and circumferential, are given as functions of time. Theoretical power of the examined turbine stage is 4.11 MW. Based on the numerical investigations the power of the analyzed stage is evaluated to be 3.5 MW. All presented in this paper results have been performed using the ANSYS Fluent solver.
    Źródło:
    Journal of Machine Engineering; 2017, 17, 2; 102-110
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of the Baumann turbine stage operation Part II. Free and kinetic vibrations
    Modelowanie pracy turbinowego stopnia Baumanna, część II – drgania swobodne i wymuszone kinetycznie
    Autorzy:
    Jesionek, K.
    Kron, J.
    Zakrzewski, W.
    Sławiński, D.
    Kornet, S.
    Ziółkowski, P.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/172994.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    turbina kondensacyjna
    stopień Baumanna
    CSD
    drgania swobodne
    drgania wymuszone
    condensing turbine
    Baumann's stage
    random vibrations
    forced vibration
    Opis:
    In this paper has been presented a methodology of validation a novel mathematical model dedicated to evaluation and prediction of material degradation and damage of steam turbine elements such as blades, valves, and pipes due to three mechanisms: stress-corrosion, high-temperature creep and low-cyclic fatigue. The validation concept is based on an experimental setup manufactured in the Laboratory of Faculty of Mechanical and Power Engineering, Wrocław UT. The concept of validation by comparison of measured and numerically predicted eigen-frequencies and eigen-modes of different turbine elements within laboratory conditions are presented, and mathematical models of three damage mechanisms have been described. Using the mentioned method of experimental validation based on comparisons of eigen-frequencies, we could calibrate yet unknown coefficients in the turbine damage model. A practical aim is an implementation of a novel life-time module for the BOTT (block of thermal stresses restriction) system. In particular the stress-corrosion factor will be added for the advanced numerical control system, creating in such way a universal, flexible and a complete tool for monitoring degrees of degradation, corrosion and damage of critical points in a steam turbine.
    Niniejszy artykuł jest kolejnym z cyklu, którego celem jest opracowanie numerycznego narzędzia badawczego opartego na CSD (Computational Solid Dynamics). Zadaniem jego byłaby weryfikacja stanu wytrzymałościowego i dynamicznego trudnodostępnych dla pomiarów urządzeń w turbinie takich jak: rurociągi pary świeżej, zawory, wirniki czy łopatki. Narzędzie obserwowałoby rozwijające się mechanizmy: korozji, pełzania wysokotemperaturowego i niskocyklicznego zmęczenia. Ostateczną walidacje modeli numerycznych z eksperymentem zaplanowano wykonać w Laboratorium Wydziału Mechaniczno-Energetycznego Politechniki Wrocławskiej. W tej części cyklu artykułów pokazano m.in. walidację modelu numerycznego z pomiarami drgań, jakie wykonano na stanowisku badawczym oraz w skrócie opisano poszczególne moduły narzędzia. Po implementacji wszystkich modeli do systemu nadzorującego pracę turbozespołu o nazwie BOTT (Blok Ograniczeń Termicznych), powstanie zupełnie nowy, elastyczny i kompletny system monitorujący stopień degradowania się elementów turbozespołu o nazwie ANCS (Advance Numerical Control Systems) działający w sposób on-line.
    Źródło:
    Archiwum Energetyki; 2013, 43, 1/2; 61--74
    0066-684X
    Pojawia się w:
    Archiwum Energetyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A role of the heat and work uncompensated transformations in the balance of entropy and the turbomachinery efficienc
    Autorzy:
    Kowalczyk, T.
    Ziółkowski, P.
    Sławiński, D.
    Cisak, M.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175450.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    entropy balance
    entropy sources
    uncompensated transformations
    isentropic efficiency
    polytropic efficiency
    eulerian fluid
    turbine stage
    Puzyrewski number
    Opis:
    The notion of heat uncompensated transformation has early been introduced by Clausius in 1854 and next, after fifty years of forgetting, in 1904 Duhem has revalorized it and combined it with a new notion of work uncompensated transformation [3]. In this way the so-called ClausiusDuhem inequality has been established. In our paper we wish to present a novelized procedure of estimating the role of the uncompensated transformations of heat and work within the flow of viscous and heat conducting working fluid like water stream. The original procedure was introduced by Puzyrewski and it is essential in expressing of a local, in time and space, balance of entropy. Futhermore, this unique approach leads to redefinition of the efficiency notion, as is usually applied to fluid-flow machineries, to a new one important in computational fluid dynamics (CFD) three-dimensional modeling. As a result, it is shown that usage of the polytropic efficiency, instead of the isentropic efficiency, is more convenient and seems to be natural in CFD approach. Helpfully, we have also found a correlation between those two efficiency definitions with usage of proposed new dimensionless (criterion) number.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2017, 135; 11-27
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ mimośrodowego przemieszczenia wału względem korpusu na wymuszenia aerodynamiczne generowane w uszczelnieniu nadbandażowym wirnika turbinowego. Cz. 1: Stanowisko badawcze
    The influence of rotor speed on the aerodynamic forces generated in the shroud clearance of a turbine stage Part 1: Test rig
    Autorzy:
    Kosowski, K.
    Piwowarski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/328268.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    dynamika wirników
    drgania samowzbudne
    rotor dynamics
    self-exited vibrations
    Opis:
    Zagadnienia poruszone w pracy dotyczą badań eksperymentalnych wymuszeń aerodynamicznych generowanych w uszczelnieniach nadbandażowych stopni turbinowych. Referat składa się z trzech części. W pierwszej opisano stanowisko powietrznej turbiny modelowej typu tarczowego z cylindrycznymi łopatkami, która odwzorowuje typowy stopień części wysokoprężnej turbiny parowej oraz omówiono układ pomiarowy pozwalający na wyznaczenie rozkładu ciśnień w szczelinie nadbandażowej. Przedstawiono wpływ takich parametrów, jak mimośrodowe przemieszczenie osi wirnika względem osi korpusu, zmiana luzu osiowego i skośne ustawienie osi wirnika względem osi korpusu na siły i momenty generowane w uszczelnieniu nadbandażowym. Sprawdzono hipotezę, że w przypadku labiryntowego, promieniowego uszczelnienia nadbandażowego decydujący wpływ na rozkład oraz wartości generowanych sił i momentów aerodynamicznych wywiera zmiana luzu promieniowego i skośne przemieszczenie osi wirnika względem osi korpusu, a zmiana luzu osiowego odgrywa znacznie mniejszą rolę.
    The experimental investigations into the pressure field in the shroud clearance were performed on a one-stage air model turbine of impulse type. Basing on the pressure distribution, the aerodynamic forces and moments were investigated as a function of rotor speed, rotor eccentricity, axial gap and rotor-stator misalignment. The experimental investigations proved that for a given turbine output, the rotor speed and the rotor-stator eccentricity appear the most important parameters influencing the aerodynamic forces and moments generated in shroud clearances.
    Źródło:
    Diagnostyka; 2002, 26; 59-64
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ mimośrodowego przemieszczenia wału względem korpusu na wymuszenia aerodynamiczne generowane w uszczelnieniu nadbandażowym wirnika turbinowego. Cz. 2: Pole ciśnienia
    The influence of rotor speed on the aerodynamic forces generated in the shroud clearance of a turbine stage Part 2: Pressure distribution
    Autorzy:
    Kosowski, K.
    Piwowarski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/328270.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    dynamika wirników
    drgania samowzbudne
    rotor dynamics
    self-exited vibrations
    Opis:
    Zagadnienia poruszone w pracy dotyczą badań eksperymentalnych wymuszeń aerodynamicznych generowanych w uszczelnieniach nadbandażowych stopni turbinowych. W pierwszej części referatu opisano stanowisko doświadczalne, a w drugiej przedstawiono pomierzone rozkłady ciśnień w uszczelnieniu nadbandażowym stopnia turbiny modelowej. Badania przeprowadzono dla różnego mimośrodowego przemieszczenia osi wirnika względem osi korpusu. Zaobserwowano pulsacyjny charakter przepływu w szczelinie nadbandażowej oraz bardzo wyraźny wpływ ekscentryczności wirnika na wartość i rozkład ciśnienia statycznego nad bandażem łopatki wirnikowej.
    The experimental investigations into the pressure field in the shroud clearance were performed on a one-stage air model turbine of impulse type. The changes of the pressure distribution were investigated as a function of rotor eccentricity. The pressure is not stationary but it pulsates. The results show the influence of the rotor-stator eccentricity on the pressure distribution in the shroud clearance.
    Źródło:
    Diagnostyka; 2002, 26; 65-69
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of bypass ratio increasing possibility for turbofan engine and turbofan with inter turbine burner
    Autorzy:
    Jakubowski, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/244907.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    aero engine
    turbofan engine
    combustion engines
    aero engine development
    turbine inter stage burner
    Opis:
    Current trends in the high bypass ratio turbofan engines development are discussed in the beginning of the paper. Based on this, the state of the art in the contemporary turbofan engines is presented and their change in the last decade is briefly summarized. The main scope of the work is the bypass ratio growth analysis. It is discussed for classical turbofan engine scheme. The next step is presentation of reach this goal by application of an additional combustor located between high and low pressure turbines. The numerical model for fast analysis of bypass ratio grows for both engine kinds are presented. Based on it, the numerical simulation of bypass engine increasing is studied. The assumption to carry out this study is a common core engine. For classical turbofan engine bypass ratio grow is compensated by fan pressure ratio reduction. For inter turbine burner turbofan, bypass grown is compensated by additional energy input into the additional combustor. Presented results are plotted and discussed. The main conclusion is drawing that energy input in to the turbofan aero engine should grow when bypass ratio is growing otherwise the energy should be saved by other engine elements (here fan pressure ratio is decreasing). Presented solution of additional energy input in inter turbine burner allow to eliminate this problem. In studied aspect, this solution not allows to improve engine performance. Specific thrust of such engine grows with bypass ratio rise – this is positive, but specific fuel consumption rise too. Classical turbofan reaches lower specific thrust for higher bypass ratio but its specific fuel consumption is lower too. Specific fuel consumption decreasing is one of the goal set for future aero-engines improvements.
    Źródło:
    Journal of KONES; 2019, 26, 2; 61-68
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ mimośrodowego przemieszczenia wału względem korpusu na wymuszenia aerodynamiczne generowane w uszczelnieniu nadbandażowym wirnika turbinowego. Cz. 3: Siły i momenty
    The influence of rotor speed on the aerodynamic forces generated in the shroud clearance of a turbine stage Part 3: Aerodynamic forces and moments
    Autorzy:
    Kosowski, K.
    Piwowarski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/328266.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    dynamika wirników
    drgania samowzbudne
    rotor dynamics
    self-exited vibrations
    Opis:
    Zagadnienia poruszone w pracy dotyczą badań eksperymentalnych wymuszeń aerodynamicznych generowanych w uszczelnieniach nadbandażowych stopni turbinowych. W pierwszej części referatu opisano stanowisko doświadczalne, a w drugiej przedstawiono pomierzone rozkłady ciśnień w uszczelnieniu nadbandażowym stopnia turbiny modelowej. W części 3 przedstawiono zagadnienie wpływu mimośrodowego przemieszczenia osi wirnika względem osi korpusu na siły ciśnieniowe i pochodzące od nich momenty, które działają na wirnik turbinowy i mogą prowadzić o drgań samowzbudnych typu aerodynamicznego.
    The experimental investigations into the forces and moments generated in the shroud clearance were performed on a one-stage air model turbine of impulse type. Basing on the pressure distribution, the aerodynamic forces and moments were calculated as a function the rotor eccentricity. The results show the influence of the rotor-stator eccentricity on the aerodynamic forces and moments generated in shroud clearances. Although the axial component of the pressure force is relatively low, the moments exerted by this force should be take into account when total aerodynamic moments are determined.
    Źródło:
    Diagnostyka; 2002, 26; 70-74
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance of three turbulence models in 3D flow investigation for a 1.5-stage turbine
    Autorzy:
    Karczewski, M.
    Błaszczak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943250.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska
    Tematy:
    turbulence modeling
    numerical research
    low-pressure turbine
    Opis:
    The object of this study was to investigate the flow phenomena in a cold air turbine built at the Institute of Jet Propulsion and Turbomachinery at Aachen Technical University (IST RWTH Aachen, Germany). The said turbine had been studied previously both experimentally and numerically on an IST’s flow solver called Panta Rhei. Since that time certain improvements, computational-wise, have been implemented in the code. In order to test them, new simulation runs were conducted. The detailed studies of the measured and computed flow angles as well as a flow velocity analysis are the means for this evaluation.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2008, 12, 3-4; 185-195
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculating study of the turbine at last stage flow field in the small volume flow condition
    Autorzy:
    Jiang, T.
    Jin, J.
    Wang, Z.
    Cao, L.
    Li, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/258680.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    turbine
    small volume flow
    flow model
    backflow
    Opis:
    Based on basic equation and boundary layer theory of pneumodynamics, the thesis conducts numerical modeling and theoretical analysis on the last stage of turbine characteristics at a small volume flow by using FLUENT, gives an emphasized analysis on the position of first occurrence of backflow and its expansion direction and comes up with flow structure of the turbine flow field at last stage in the small volume flow condition. In connection with specific experiments, it puts forward the flow model of backflow occurring in the last stage field and the solution to the model. The flow field at last stage for a 100MW turbine in the small volume flow condition that is calculated by using the model is basically in conformity to the actual result.
    Źródło:
    Polish Maritime Research; 2017, S 3; 23-27
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multidisciplinary design and optimization of gas turbine engine low pressure turbine at preliminary design stage
    Autorzy:
    Bar, W.
    Orkisz, M.
    Moustapha, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/246241.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    design and optimization
    turbomachinery
    turbines
    Opis:
    The gas turbine engine has evolved rapidly during past decades to provide a reliable and efficient business solution for global transportation. The engine design process is clearly a large contributor to this evolution. This process is highly iterative, multidisciplinary and complex in nature. The success of an engine depends on a carefully balanced design that best exploits the interactions between numerous traditional engineering disciplines such as aerodynamics and structures as well as lifecycle analysis of cost, manufacturability, serviceability and supportability. To take into account all of these disciplines and optimization should be used. Currently most of present state-of-art numerical modelling methods, which are used mainly at detailed design stage, are unsuitable for this task due to very high computational time. The solution to this problem can be found in multidisciplinary design and optimization at preliminary design stage with use of simple 1-2D models. This paper presents current aero engine design process and indicates possibilities of future improvements by utilization of proposed methodology, which take into account aerodynamic, thermodynamic and structures (blade, fixing and disc) calculations, connected in one multidisciplinary model, which is suited for optimization. All disciplinary models are presented and described in this paper as well as connection between them, with study over design variable, goal function and constrains that should be used. Moreover, a strategy of optimization is proposed as well as methods for acceleration of optimization process by use of surrogate. The presentation of methodology is followed by example optimization of low-pressure aero engine turbine.
    Źródło:
    Journal of KONES; 2014, 21, 3; 15-22
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in aerodynamic parameters for 5-stage steam turbine during warming and gradual start-up to nominal operating parameters
    Autorzy:
    Hoznedl, M.
    Bednář, L.
    Tajč, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/175267.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam turbine
    experimental measurement
    warming
    start-up
    efficiency
    Opis:
    The results of experiments on the 5-stage steam turbine are presented. The parameters of individual stages as well as the whole turbine are observed during the gradual start-up to nominal operating parameters. The pressures and temperatures are shown at stages in idling, heating up the experimental turbine and during the transition to operating speed. A greater attention is devoted to three selected operational conditions with different processed enthalpy drops. Problems with efficiency and enthalpy drops measurement during warming are described. The attempts to measure flow parameters quickly and without time for heating of turbine casings and other parts are often in the experimental research caused byprice of the survey. This contributionÞs task is to inform about these situations and to avoid confused and untrue results obtained by somewhat hasty measurements due to reduction and optimisation of costs.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 134; 45-62
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Repairability analysis of the energy gas turbine rotor blade second stage shroud by high-temperature brazing
    Analiza możliwości naprawy metodą lutowania wysokotemperaturowego osłony łopatki wirnika drugiego stopnia energetycznej turbiny gazowej
    Autorzy:
    Klimczuk, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1819233.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    turbina gazowa
    lutowanie wysokotemperaturowe
    uszczelnienie ulowe
    uszczelnienie labiryntowe
    gas turbine
    high temperature brazing
    honeycomb seal
    labyrinth seal
    Opis:
    The article considers the repair of the energy gas turbine rotor blade second stage shroud. The paper presents an analysis of the possibility of the repair consisting of the replacement of both labyrinth and honeycomb seals by the high-temperature brazing process. All the steps of the repair process were discussed and the results of microscopic metallographic evaluation using a light microscope and a scanning electron microscope were presented. SEM BSE microstructure and elements distribution of the joints has been presented. Several advantages related to the use of this technology were indicated.
    W artykule omówiono tematykę regeneracji osłony łopatki wirnika drugiego stopnia energetycznej turbiny gazowej. Przedstawiono analizę możliwości jej naprawy polegającej na wymianie zarówno uszczelnień labiryntowych jak i ulowych z zastosowaniem procesu lutowania wysokotemperaturowego. Omówiono poszczególne etapy procesu naprawy oraz zaprezentowano wyniki badań metalograficznych mikroskopowych z użyciem mikroskopu świetlnego oraz elektronowego mikroskopu skaningowego. Wskazano na szereg korzyści związanych ze stosowania tej technologii.
    Źródło:
    Welding Technology Review; 2021, 93, 2; 23--31
    0033-2364
    2449-7959
    Pojawia się w:
    Welding Technology Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza propagacji hałasu siłowni wiatrowych na etapie planowania farmy wiatrowej Wieliszewo (województwo pomorskie)
    Analysis of wind turbine noise at the planning stage of a Wieliszewo wind farm (Pomorskie Province)
    Autorzy:
    Gnyp, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/357240.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Śląska
    Tematy:
    wind turbine noise
    PN-ISO 9613-2
    wind turbine
    micrositing
    WindPRO
    digital elevation model (DEM)
    hałas siłowni wiatrowych
    siłownia wiatrowa
    lokalizowanie siłowni wiatrowych
    numeryczny model terenu
    Opis:
    The noise analysis of wind turbines was performed using wind energy software WindPRO. For the calculation parameters of Vestas V100 wind turbine with a nominal power of 2 MW generator, the tower height of 95 m and a maximum sound power level of 105 dB was used. Considered acceptable levels of noise emissions of wind turbines in accordance with „Rozporządzenie Ministra Środowiska, z dnia 14 czerwca 2007r. w sprawie dopuszczalnych poziomów hałasu w środowisku, (Dz. U. Nr 120 poz. 826).” Analysis of noise propagation was performed in accordance with „Rozporządzenie Ministra Środowiska z dnia 7 listopada 2014 r. w sprawie wymagań w zakresie prowadzenia pomiarów wielkości emisji oraz pomiarów ilości pobieranej wody, (Dz. U. z 2014 r., poz. 1542)”. The calculation method has been applied in accordance with ISO standard PN-ISO 9613-2. The map showing the propagation of noise with isolines for a Wieliszewo wind farm was generated. The results analysis show no exceeding noise limit values at the calculation points.
    Analizę propagacji hałasu siłowni wiatrowych wykonano przy użyciu specjalistycznego oprogramowania dla energetyki wiatrowej WindPRO. Do obliczeń wykorzystano parametry siłowni wiatrowej Vestas V100 o mocy nominalnej generatora 2 MW, wysokości wieży 95 m i maksymalnej mocy akustycznej na poziomie 105 dB. Zostały uwzględnione dopuszczalne poziomy emisji hałasu siłowni wiatrowych zgodnie z Rozporządzeniem Ministra Środowiska, z dnia 14 czerwca 2007r. w sprawie dopuszczalnych poziomów hałasu w środowisku, (Dz. U. Nr 120 poz. 826). Analiza propagacji hałasu została wykonana w zgodzie z Rozporządzeniem Ministra Środowiska z dnia 7 listopada 2014 r. w sprawie wymagań w zakresie prowadzenia pomiarów wielkości emisji oraz pomiarów ilości pobieranej wody (Dz. U. z 2014 r., poz. 1542). Zastosowano metodę obliczeniową zgodna z normą PN-ISO 9613-2. Wygenerowano izofony obrazujące propagację hałasu dla farmy wiatrowej Wieliszewo. Wyniki analizy wskazują na brak przekroczeń dopuszczalnych poziomów immisji hałasu dla przyjętych punktów obliczeniowych.
    Źródło:
    Archiwum Gospodarki Odpadami i Ochrony Środowiska; 2016, 18, 1; 7-14
    1733-4381
    Pojawia się w:
    Archiwum Gospodarki Odpadami i Ochrony Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fe analysis of a steam turbine HP rotor blade stage concerning material effort, dynamic properties and creep damage assessment
    Analiza MES wysokoprężnego stopnia turbiny parowej dotycząca wytężenia materiału, własności dynamicznych i oceny trwałości ze względu na pełzanie
    Autorzy:
    Borkowski, P.
    Głowacki, D.
    Nowakowska, A.
    Pawlicki, J.
    Zwoliński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/139804.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam turbine
    structural analysis
    creep analysis
    modal analysis
    finite element method
    FEM
    turbina parowa
    analiza strukturalna
    analiza pełzania
    analiza modalna
    metoda elementów skończonych
    MES
    Opis:
    This paper is concerned with the 1st stage of HP rotor blade assembly steam turbine TK 120. The methodology was focused on the selection of mechanical properties and the way of the rotor disc modeling and estimating the degree of damage caused by creep. Then the dynamic interference between the frequencies of excitation and the natural frequencies was assessed. Static calculations were performed for the cyclic sectors consisting of the disc, disc blades, spacers and shrouding, including loads as temperature, mass forces from the angular velocity and the pressure on the blades. Then, the creep analysis using a Norton’s model and the modal analysis were performed. Static analysis gave information concerning the distributions of displacements, stress and strain components. In the creep analysis, the creep displacements and stress relaxation versus time were determined and the estimated degree of damage caused by creep was evaluated at each part of the rotor disc. In the modal analysis, the natural frequencies and modes of vibrations corresponding to the nodal diameters were found. The results of modal analysis were shown in the SAFE graph. Numerical calculations have shown that the rotor disc was a well-designed structure and did not reveal any dynamic interference.
    Praca dotyczyła pierwszego stopnia wysokoprężnej części wirnika turbiny parowej TK 120. Przedstawiono metodykę doboru właściwości mechanicznych, sposobu modelowania wirnika, szacowania stopnia zużycia spowodowanego pełzaniem oraz oceny interferencji dynamicznych pomiędzy częstościami wymuszeń a częstościami drgań własnych. W obliczeniach statycznych modelu tarczy wirnika z łopatkami, przekładkami i bandażem wykorzystano cykliczną symetrię, z uwzględnieniem temperatury, sił masowych od wirowania i ciśnienia na łopatkach. Następnie przeprowadzono analizę pełzania według modelu Nortona oraz analizę modalną. W obliczeniach statycznych wyznaczono rozkłady przemieszczeń, odkształceń i naprężeń. W analizie pełzania wyznaczono przemieszczenia pełzania i relaksację naprężeń w czasie oraz oszacowano stopień zużycia ze wzgledu na pełzanie w poszczególnych częściach wirnika turbiny. W analizie dynamicznej wyznaczono częstości i postacie drgań własnych odpowiadajace poszczególnym średnicom węzłowym. Wyniki analizy modalnej przedstawiono na wykresie SAFE. Obliczenia numeryczne wykazały, że wirnik jest konstrukcją dobrze zaprojektowaną i nie wykazującą interferencji dynamicznych.
    Źródło:
    Archive of Mechanical Engineering; 2016, LXIII, 1; 163-185
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of last stage blade of 13K215 turbine intermediate pressure module
    Autorzy:
    Bondyra, Radosław
    Przytulski, Jan
    Dominiczak, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2091352.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    efficiency
    strength calculation
    steam turbine
    last stage blade
    fluid flow
    calculation
    Opis:
    Paper is considering the purpose and the process of development of last stage blade for intermediate pressure module of 13K215 steam turbine. In the last 20–30 years most of the steam turbine manufacturers were focused on improving such a turbine mainly by upgrading low pressure module. In a result of such a modernization technology were changed from impulse to reaction. The best results of upgrading were given by developing low pressure last stage blade. With some uncertainty and based on state of art knowledge, it can be stand that improving of this part of steam turbine is close to the end. These above indicators show an element on which future research should be focused on – in the next step it should be intermediate pressure module. In the primary design the height of intermediate pressure last stage blade was 500 mm but because of change of technology this value was decreased to 400 mm. When to focus on reaction technology, the height of the last stage blade is related to output power and efficiency. Considered here is the checking the possibility of implementing blades, in a reaction technology, higher than 400 mm and potentially highest. Article shows a whole chosen methodology of topic described above. It leads through the reasons of research, limitations of 13K215 steam turbine, creation of three-dimensional models, fluid flow calculations, mechanical integrity calculations and proposed solutions of design.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 1; 45--62
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of stator-rotor interspace overlap of meridional contours on the efficiency of high-pressure steam turbine stages
    Autorzy:
    Rusanov, Andrii
    Rusanov, Roman
    Powiązania:
    https://bibliotekanauki.pl/articles/1845496.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-pressure steam turbine
    cavern
    overlap
    impulse type stage
    reactive type stage
    Opis:
    The results of a systematic study of the influence of meridional contours overlap in the stator-rotor axial interspace of the impulse and reactive type stages of a high-pressure steam turbine on the flow structure and gas-dynamic efficiency of the flow part are introduced. The studied flow parts of the impulse and reactive stages are typical for high-power high-pressure steam turbines. It is shown that the stages that have no overlaps and/or have a smooth shape of meridional contours have the best gasdynamic efficiency, and the most negative effect on the flow part is caused by the presence of caverns in the stator-rotor interspace. For cases where, due to technological limitations, it is impossible to avoid the presence of caverns and overlaps with a sharp (step-wise) change in the shape of the meridional contours, it is recommended to perform overlaps with positive size of overlap values near the rotor blades.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 1; 97-114
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and computational fluid dynamics analysis of the last stage of innovative gas-steam turbine
    Autorzy:
    Głuch, Stanisław Jerzy
    Ziółkowski, Paweł
    Witanowski, Łukasz
    Badur, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1955024.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    axial turbine
    blade design
    computational fluid dynamics
    last stage of low-pressure
    twisted blade
    Opis:
    Research regarding blade design and analysis of flow has been attracting interest for over a century. Meanwhile new concepts and design approaches were created and improved. Advancements in information technologies allowed to introduce computational fluid dynamics and computational flow mechanics. Currently a combination of mentioned methods is used for the design of turbine blades. These methods enabled us to improve flow efficiency and strength of turbine blades. This paper relates to a new type turbine which is in the phase of theoretical analysis, because the working fluid is a mixture of steam and gas generated in a wet combustion chamber. The main aim of this paper is to design and analyze the flow characteristics of the last stage of gas-steam turbine. When creating the spatial model, the atlas of profiles of reaction turbine steps was used. Results of computational fluid dynamics simulations of twisting of the last stage are presented. Blades geometry and the computational mesh are also presented. Velocity vectors, for selected dividing sections that the velocity along the pitch diameter varies greatly. The blade has the shape of its cross-section similar to action type blades near the root and to reaction type blades near the tip. Velocity fields and pressure fields show the flow characteristics of the last stage of gas-steam turbine. The net efficiency of the cycle is equal to 52.61%.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 3; 255-278
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic analysis of the control stage of a high speed steam turbine
    Autorzy:
    Sławiński, D.
    Zakrzewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/175498.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    control stage
    residual stresses
    initial displacement blade
    vibrations blade
    Opis:
    This paper analyzes the possibility of resonances within a control stage of a high speed turbine. An original method for steady state operation is used for the analysis of the stiffness matrix representing: initial displacement blade (nominal shape blade obtained by nominal working point of turbine) and residual stresses following local crossing yield plastic strain. In the analysis there has been found a possibility of occurance of the resonance frequency, and mistuning by showing the safe working ranges. The calculation used the 3D modal and harmonic analysis within computational solid dynamics (CSD) and the results were compared with the 0D data from literature. After local crossing of yields stresses, on the basis of the harmonic analysis, there has been shown operation of the blade in the resonance point. Before crossing the yield stresses the blade is working in mistuning and a safe point.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 41-49
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of geometric errors of throat sizes of last stage blades in a mid-size steam turbine
    Autorzy:
    Eret, Petr
    Hoznedl, Michal
    Powiązania:
    https://bibliotekanauki.pl/articles/2142353.pdf
    Data publikacji:
    2022
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    steam turbine
    blade throat
    3D optical scanning
    geometric deviation
    Opis:
    Steam turbine technology with enhanced flexibility will continue to participate in electric power supply mixes. Last stage blades secure the reliability of a steam turbine and require high precision manufacturing and assembly. This case study presents a statistical analysis of geometric errors of the throat sizes of the last stage blades in a mid-size steam turbine. A 3D optical scanner is employed to capture detailed geometries of rotor blades and a half of assembled nozzle diaphragm. Unrolled cylinder cross-sections are used to evaluate 2D geometrical features such as blade throats and areas at three different diameters, and the results are compared to intended designs. In addition, linear correlations between the throat size and blade pitch, area and trailing edge thickness are established, and blade throat position shifts are quantified. Such a comprehensive study is presented for the first time, and some useful conclusions can be retrieved from this case study.
    Źródło:
    Journal of Machine Engineering; 2022, 22, 3; 132--147
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and performance study of a small-scale waste heat recovery turbine
    Autorzy:
    Rusanov, R.
    Jędrzejewski, Ł.
    Klonowicz, P.
    Żywica, G.
    Lampart, P.
    Rusanov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/175197.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cogeneration unit
    low-boiling working media
    numerical method
    turbine
    radialaxial stage
    Opis:
    The paper presents the design process of a radial-axial turbine working with SES36 working fluid. First, the mean-line design process is performed and then the geometry is developed. In the next stage the numerical verification is performed taking into account the real properties of the working fluid. The properties are implemented via a look-up table and by a modified Benedict-Webb-Rubin equation of state. The presented turbine is characterized by a very small stator outflow angle which is about 4.5◦ but despite this small value, the efficiency of the machine is relatively high and equal to about 88%. The influence of internal leakages has also been investigated.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 133; 145-162
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modern methods of identification design conditions for single stage micro scale centrifugal compressor
    Autorzy:
    Czarnecki, M.
    Olsen, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/243293.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    jet engine
    gas turbine
    design
    off design
    trend prediction
    centrifugal compressor
    Opis:
    Micro scale gas turbine engines are low cost engines. They share their compressor impeller with automotive turbochargers. An identified design condition for the selected impeller is a critical stage of the design process. This process is had difficulties due the large number of manufacturers that provide OEM parts. It is common practice that one OEM part number provides the same impeller at different design revision. In general, parts are interchangeable but in detail, they differ slightly in terms of dimensions and performance. To avoid under predict or over predict inputs data, it is important to check the design parameters with as many methods as possible. In practice, the designer could rely on analytical methods, which are straightforward limited to the applied design. When shared its (compressor operation) it is recommended additional information be provided by computational fluid dynamics that produces a three-dimensional look into the predesign. That allows avoidance of future design failure and reduces both design time and prototype manufacturing costs.
    Źródło:
    Journal of KONES; 2017, 24, 2; 73-84
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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