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Wyszukujesz frazę "turbine dynamics" wg kryterium: Temat


Tytuł:
The strength and dynamic analysis of the prototype of Tesla turbine
Badania wytrzymałościowe i dynamiczne prototypu turbiny Tesli
Autorzy:
Bagiński, P.
Jędrzejewski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/328388.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
turbine dynamics
strength
Tesla turbine
modal analysis
dynamika turbin
wytrzymałość
turbina Tesli
analiza modalna
Opis:
This article presents the strength and modal analysis of the rotor model of the Tesla micro-turbine. The calculations were made in order to verify the design of multi-disc turbine’s rotor before production process. Two commercial solvers were used independently, which are capable to deal with problems of solid state physics – Abaqus and Ansys Mechanical with Workbench software. The comparison of results from two applications aimed at checking solvers’ applicability in the present case. Preliminary analysis was carried out in Abaqus software. The calculations were performed assuming perfect bearing stiffness for different rotation speeds. A more detailed analysis was made in Ansys Mechanical software using structure analysis modules to determine the stresses in the structure which arise as a consequence of rotor’s rotational motion. Subsequently, it was followed up with modal analysis results. Additionally the parameters of selected bearings were determined and modal analysis took into account the stiffness corresponding to individual rolling bearings.
W niniejszej artykule przedstawiono wyniki analizy wytrzymałościowej i dynamicznej prototypu modelu wirnika mikroturbiny Tesli. Analizy zostały przeprowadzone w celu sprawdzenia i weryfikacji projektu wielodyskowego wirnika turbiny Tesli przed etapem produkcyjnym. Obliczenia zostały przeprowadzone niezależnie przy pomocy dwóch komercyjnych solwerów do analizy mechaniki ciała stałego - Abaqus oraz Ansys Mechanical w środowisku Workbench. Porównanie wyników z dwóch aplikacji ma na celu wzajemną weryfikację stosowalności solwerów do omawianego przypadku. Wstępna analiza została wykonana w programie Abaqus. Obliczenia zostały wykonane przy założeniu całkowitej sztywności łożysk i zadanej prędkości obrotowej. Dokładna analiza została wykonana w programie Ansys Mechanical w środowisku Workbench przy wykorzystaniu modułów do analizy strukturalnej w celu wyznaczenia wstępnego stanu naprężeń będącego konsekwencją ruchu obrotowego wirnika oraz modułu analizy modalnej. Dodatkowo wyznaczono parametry wstępnie dobranych łożysk i wykonano analizę modalną uwzględniającą sztywności właściwe dla zastosowanych typów poszczególnych łożysk tocznych.
Źródło:
Diagnostyka; 2015, 16, 3; 17-24
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unstable operation of the turbine aircraft engine
Autorzy:
Kozakiewicz, A.
Kowalski, M.
Powiązania:
https://bibliotekanauki.pl/articles/280192.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
turbine engine
engine dynamics
compressor stall
Opis:
The article presents reasons for generating a non-uniform field of parameters in the compressor inlet of a turbine aircraft engine and its influence on the air jet kinematics at lowering fatigue strength of the compressor blade. Analysis of the engine torque in function of the engine operation time has been performed. Courses of the basic turbine engine operations parameters during compressor stall have been presented. The significant role of changes of the first torque derivative in relation to variation of the rotor acceleration in that assessment has been determined, which may be an important signal of the compressor surge occurring in the compressor. That parameter may be a signal for the control system to eliminate the negative phenomenon. The engine dynamics during the compressor surge has also been presented by developing the phase images of the engine operation basic parameters. The article includes analysis of dynamical changes in temperature of the combustion gases.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 719-727
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
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:
Thermal oil biomass boiler dynamics as a part of the micro-CHP ORC plant
Autorzy:
Turzyński, T.
Żywica, G.
Powiązania:
https://bibliotekanauki.pl/articles/175454.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CHP
boiler
dynamics
ORC
micro-turbine
thermal oil
Opis:
The aim of the paper is to present the results of experimental research conducted on two helical coil biomass boilers with oil heatingagent, which are acentral unitsof co generative micro powerplant designed and built in IFFM in Gdańsk. Experimental data served as a source for defining the interdependencies governing the dynamics of the micro-CHP as a whole. Furthermore, during the research the authors came across a few possible modifications to the construction that may yet improve the device.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 138; 3-11
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD computation of the savonius rotor
Autorzy:
Rogowski, K.
Maroński, R.
Powiązania:
https://bibliotekanauki.pl/articles/280680.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
vertical axis wind turbine
simulation
computational fluid dynamics (CFD)
Opis:
In this paper, Computational Fluid Dynamics (CFD) analysis of a two-dimensional two- -bucket Savonius rotor, using ANSYS Fluent solver, is presented. Computational methods of fluid dynamics are used to estimate the aerodynamic forces acting on the rotor, the torque and the power extracted by the Savonius rotor. In addition, an analysis of the results for different turbulence models is performed. Numerical investigations are compared with the experiment of the Sandia National Laboratories.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 1; 37-45
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of the intake vortex formation in the case of a double fuselage shielded inlet
Autorzy:
Kozakiewicz, A.
Frant, M.
Powiązania:
https://bibliotekanauki.pl/articles/281631.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
turbine jet engine
inlet intake vortex
computational fluid Dynamics
Opis:
The paper raises a very important problem, concerning the work of turbine-jet engines, that is the intake vortex. A phenomenon which is relevant to all engines of this type. The article demonstrates literature data determining the influence of the airflow direction and zone on the possibility of vortex formation, taking into consideration the influence of basic geometrical data. The outcomes of calculations related to the formation of the inlet vortex for a given fuselage shielded inlet constructional system are shown. The studies are concerned with determination of the influence of angles and the gust speed value on forming of the vortex in this kind of intake.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 3; 757-766
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Steady and unsteady analysis of NACA 0018 airfoil in vertical-axis wind turbine
Autorzy:
Rogowski, K.
Hansen, M. O. L.
Maroński, R.
Powiązania:
https://bibliotekanauki.pl/articles/279244.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
airfoil characteristics
vertical-axis wind turbine
computational fluid dynamics
Opis:
Numerical results are presented for aerodynamic unsteady and steady airfoil characteristics of the NACA 0018 airfoil of a two-dimensional vertical-axis wind turbine. A geometrical model of the Darrieus-type wind turbine and the rotor operating parameters used for numerical simulation are taken from the literature. Airfoil characteristics are investigated using the same mesh distribution around the airfoil edges and two turbulence models: the RNG k-ε and the SST Transition. Computed results for the SST Transition model are in good agreement with the experiment, especially for static airfoil characteristics.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 203-212
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the gust impact on inlet vortex formation of the fuselage-shielded inlet of an jet engine powered aircraft
Autorzy:
Kozakiewicz, A.
Frant, M.
Powiązania:
https://bibliotekanauki.pl/articles/279399.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
turbine jet engine inlet
intake vortex
numerical fluid dynamics
Opis:
Selected problems of a complex structure, namely the fuselage-shielded inlet model of a turbine jet engine for numerical analysis purposes of the intake vortex formation phenomenon are presented in this paper. As a result of numerical analysis, an intake vortex has been developed. The analysis of the impact of changes in speed, angle and the direction of gust on vortex development has been conducted. Also, consequences of ingestion of foreign objects by the inlet and relevant statistics concerning damage to turbine engines have been presented.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 4; 993-1002
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical verification of icing hypotheses of the inlet of aircraft turbine engine TW2-117A
Autorzy:
Panas, A. J.
Fafiński, T.
Frant, M.
Chachurski, R.
Powiązania:
https://bibliotekanauki.pl/articles/246458.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aerospace technology
turbine power plants
TW2-117A turbine power plant
turbine engine inlet icing
numerical fluid dynamics
Opis:
Numerical analysis of the inlet flow of aircraft turbine powerplant has been performed. The analysis has been focused on thermal conditions in view of the expected inlet icing phenomena. A commercial CFD Fluent package has been utilized in developing the model and solving the stated problem. The modelled system was a TW2-117A engine inlet of Mi-8P helicopter. Calculations of 2-D axisymmetric compressible viscous flow have been conducted. The modelled medium has been assumed of the air thermophysical properties. At the present stage effects the moist content and two-phase flow have been neglected. The calculations complemented results of previous theoretical analyses and experimental measurements with images of the temperature and the flow velocity distribution. The maximum temperature drop has been estimated to be at last -4 K close to the external inlet wall and about -5 K close to the central body. The boundary layer parameters have been identified applying several standard models of turbulence. The qualitative image of icing flow conditions has been verified and confirmed.
Praca dotyczy analizy numerycznej termicznych warunków przepływu powietrza we wlocie lotniczego silnika turbinowego. Do analizy wykorzystano pakiet numerycznych obliczeń przepływowych FLUENT. Modelowano ściśliwy przepływ powietrza we wlocie silnika TW2-117A śmigłowca Mi-8P. Obliczenia wykonano w wariancie dwuwymiarowym osiowosymetrycznym dla założonych charakterystycznych warunków brzegowych przepływu. Kontekst analizy stanowiły zjawiska oblodzeniowe uwzględnione głównie w warunkach termicznych i w opisie właściwości modelowanego medium - powietrza. Ze względu na skupienie uwagi na zagadnieniach zmian temperatury uwarunkowanych kinetyką przepływu pominięto w obecnym etapie pracy zjawiska związane z efektami przepływu dwufazowego, uwzględniono natomiast lepkość powietrza. Wyniki obliczeń, w tym rezultaty otrzymane dla różnych modeli turbulencji, porównano z rezultatami wcześniej przeprowadzonej analizy teoretycznej i wynikami pomiarów zmian temperatury w trakcie prób silnika na hamowni. Uzyskano potwierdzenie hipotez oblodzeniowych oraz potwierdzono poprawność zastosowanych procedur badań doświadczalnych. Analiza wyników obliczeń numerycznych pozwoliła na odtworzenie obrazu przestrzennego pól parametrów przepływu. Maksymalny spadek temperatury w pobliżu ścianek zewnętrznych kanału określono jako nie mniejszy od -4 K, a w pobliżu ciała centralnego -5 K. Porównując wyniki obliczeń z wykorzystaniem kilku modeli turbulencji zidentyfikowano również parametry warstwy przyścienne.
Źródło:
Journal of KONES; 2007, 14, 3; 503-510
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wind turbine operation parameter characteristics at a given wind speed
Autorzy:
Kamiński, Z.
Czyż, Z.
Wendeker, M.
Powiązania:
https://bibliotekanauki.pl/articles/103129.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wind turbine
renewable energy
computational fluid dynamics (CFD)
numerical analysis
Opis:
This paper discusses the results of the CFD simulation of the flow around Vertical Axis Wind Turbine rotor. The examined rotor was designed following patent application no. 402214. The turbine operation is characterised by parameters, such as opening angle of blades, power, torque, rotational velocity at a given wind velocity. Those parameters have an impact on the performance of entire assembly. The distribution of forces acting on the working surfaces in the turbine can change, depending on the angle of rotor rotation. Moreover, the resultant force derived from the force acting on the oncoming and leaving blades should be as high as possible. Accordingly, those parameters were individually simulated over time for each blade in three complete rotations. The attempts to improve the performance of the entire system resulted in a new research trend to improve the performance of working turbine rotor blades.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 22; 75-82
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on aerodynamic forces in seals of turbine stages
Autorzy:
Stępień, R.
Kosowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/259359.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
rotor dynamics
self-excited vibrations
aerodynamic forces
blade seals
turbine shrouds
Opis:
This paper presents results of numerical examination of flow through over-shroud seals of turbine stages. Various labyrinth seals of different configurations and number of sealing teeth were considered. It was demonstrated that results of investigations of isolated seals cannot be directly used for analyzing turbine stage operation. Such approach may lead to relatively large errors in determining value of aerodynamic force and direction of its action.
Źródło:
Polish Maritime Research; 2009, S 1; 58-63
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the modelling of aerodynamic force coefficients for over-shroud seals of turbine stages
Autorzy:
Włodarski, W.
Kosowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/259389.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
rotor dynamics
self-excited vibrations
aerodynamic forces
blade seals
turbine shrouds
Opis:
This paper presents experimental investigations which made it possible to determine dynamic coefficients of labyrinth over-shroud seal of a model air turbine. The coefficients associate pressure forces with turbine rotor displacement, velocity and acceleration respective to turbine casing (linear model) and play important role in analyzing turbine-set dynamics. The obtained results indicated that involving serious errors can be expected in the case of application of the simplification consisting in neglecting inertia coefficients, proposed in the literature. It was simultaneously demonstrated that seals can be also met of weak damping qualities, for which to neglect damping coeffcients is allowable.
Źródło:
Polish Maritime Research; 2009, S 1; 71-74
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of the FKT system with different mooring lines
Autorzy:
Wu, Jo-Ti
Chen, Jiahn-Horng
Hsin, Ching-Yeh
Chiu, Forng-Chen
Powiązania:
https://bibliotekanauki.pl/articles/258986.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ocean current energy
floating turbine system
mooring line
system dynamics
surface waves
Opis:
To harness the endless hydrokinetic energy of the Kuroshio current, the joint research team of the National Taiwan University and the National Taiwan Ocean University has developed a floating Kuroshio turbine (FKT) system in Taiwan. In normal operation, the system floats at a certain small depth from the ocean surface to reduce the wave effects and take advantage of faster current speeds. In the present study, the effect of the mooring line on the system dynamics is investigated computationally. Two different auxiliary mooring line designs and, for each design, three different common mooring lines (polyester ropes of neutral buoyancy, iron chains, and 6×19 wires ropes with wire core) are examined. The study makes use of several commercial and in-house packages, integrated to find various coefficients. It is found that the mooring line, the auxiliary mooring line design, and the gravity centre can have a significant effect on system fluctuations in normal operation if the combination of these factors is not properly matched.
Źródło:
Polish Maritime Research; 2019, 1; 20-29
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational design and optimisation of innovative, high-efficiency wind turbine
Autorzy:
Stalewski, W.
Zalewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/246604.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
green power
wind turbine
computational fluid dynamics (CFD)
computer-aided design
optimisation
Opis:
New concept of innovative, high-efficiency wind turbine has been developed and optimised. The turbine consists of a rotor with a vertical axis of rotation and a ring-palisade casing, which task is to deflect wind stream so that it flows perpendicularly to the rotor plane. The main advantage of such configuration of a wind turbine is that due to the vertical axis of symmetry, it works independently on the wind direction and it does not need any mechanism directing it towards the wind. The greatest challenge when designing the turbine was to minimise losses of energy of the wind stream deflected by 90 degrees by the ring vanes of the casing. This involved optimisation of number, shapes and mutual positions of the ring vanes. The whole optimisation works were done based on computational methods of Computer-Aided Design and Optimisation and Computational Fluid Dynamic. Subsequent variants of the ring-palisade casing were designed using an appropriately adapted in-house-software package supporting design and optimisation of multi-element airfoils. Three-dimensional analysis of flow around and inside the casing was conducted by application of commercial URANS solver ANSYS FLUENT. Eventually designed turbine is characterised by high efficiency in respect of acceleration of the wind stream. On the basis of computer simulations, it is estimated that the average velocity of air stream flowing through the rotor plane may be higher than the wind speed by about 45%. Extent of the acceleration of the wind stream partially depends on the number of ring vanes comprising a casing. Depending on specificity of application, this number of ring vanes may be chosen by a compromise between performance and dimensions of the turbine. The proposed wind turbine seems to be very promising solution, especially within the area of small and moderate renewable-energy sources, which in particular may be placed directly in residential-building areas, e.g. on the roofs of houses. This type of renewable-energy sources may also be successfully used in the field of environmentally friendly transport, in the process of producing hydrogen as fuel for fuel cell vehicles.
Źródło:
Journal of KONES; 2015, 22, 2; 221-232
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
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

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