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Wyświetlanie 1-15 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
Wyświetlanie 1-15 z 36

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