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    Wyświetlanie 1-13 z 13
    Tytuł:
    Application of hybrid CFD/CAA technique for modeling pressure fluctuations in transonic flows
    Autorzy:
    Dykas, S.
    Wróblewski, W.
    Rulik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955297.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska
    Tematy:
    transonic flow
    aeroacoustic noise
    hybrid technique
    Opis:
    Solving AeroAcoustics (CAA) problems by means of the Direct Numerical Simulation (DNS) or even the Large Eddy Simulation (LES) for a large computational domain is very time consuming and cannot be applied widely for engineering purposes. In this paper in-house CFD and CAA codes are presented. The in-house CFD code is based on the LES approach whereas the CAA code is an acoustic postprocessor solving non-linearized Euler equations for fluctuating (acoustic) variables. These codes are used to solve the pressure waves generated aerodynamically by a flow over a rectangular cavity and by the vortex street behind a turbine blade. The obtained results are discussed with respect to the application of the presented numerical techniques to pressure waves modeling in steam turbine stages.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2013, 17, 3-4; 145--154
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Method for Modeling of Acoustic Waves Propagation
    Autorzy:
    Dykas, S.
    Wróblewski, W.
    Rulik, S.
    Chmielniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/177994.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic wave
    fluctuations
    aerodynamic noise
    Euler equations
    Opis:
    In this paper, numerical results of modeling of acoustic waves propagation are presented. For calculation of the acoustic fluctuations, a solution of the full non-linear Euler equation is used. The Euler equations are solved with the use of a numerical scheme of third-order accuracy in space and time. The paper shows a validation process of the described method. This method is suitable also for an aerodynamic noise assessment on the basis of unsteady mean flow field data obtained from a CFD calculations. In such case this method is called a hybrid CFD/CAA method. The proposed method is numerically decoupled with CFD solution, therefore the information about the mean unsteady flow field can be obtained using an arbitrary CFD method (solver). The accuracy of the acoustic field assessment depends on the quality of the CFD solutions. This decomposition reduces considerably the computational cost in comparison with direct noise calculations. The presented Euler acoustic postprocessor (EAP) has been used for modeling of the acoustic waves propagation in a cavity and in the flow field around a cylinder and an aerodynamic profile.
    Źródło:
    Archives of Acoustics; 2010, 35, 1; 35-48
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of the internal reheat application on the efficiency of the 900 MW ultra-supercritical coal-fired power unit
    Autorzy:
    Łukowicz, H.
    Dykas, S.
    Stępczyńska, K.
    Rulik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/240128.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sprawność generowania energii elektrycznej
    ultra-nadkrytyczne bloki energetyczne
    wewnętrzne podgrzewanie
    electricity generation efficiency
    internal reheat
    ultra-supercritical coal-fired power units
    Opis:
    The paper presents a thermal-economic analysis of a 900 MW coal-fired power unit for ultra-supercritical parameters with internal steam reheat. The subject of the study was the cycle proposed as the "initial thermal cycle structure" during the completion of the project "Advanced Technologies for Energy Generation" with the steam parameters of 650/670 [degrees]C/30 MPa. Two configurations of internal reheat were analysed: with a fourand seven-section exchanger. The effect of reheat on the operation of the power unit under a partial load was also analysed, and preliminary calculations of the heat exchange area of the internal reheat were made.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 3; 127-144
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic and economic analysis of a 900 MW ultra-supercritical power unit
    Autorzy:
    Łukowicz, H.
    Dykas, S.
    Rulik, S.
    Stępczyńska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/240644.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    obieg pary
    parametry apry
    podwójne podgrzewanie
    coal-fired power unit
    double reheat
    steam cycle
    ultra-supercritical steam parameters
    Opis:
    The paper presents a thermal-economic analysis of different variants of a hard coal-fired 900 MW ultra-supercritical power unit. The aim of the study was to determine the effect of the parameters of live and reheated steam on the basic thermodynamic and economic indices of the thermal cycle. The subject of the study was the cycle configuration proposed as the "initial thermal cycle structure" during the completion of the project "Advanced Technologies for Energy Generation" with the live and reheated steam parameters of 650/670 [degrees]C. At the same time, a new concept of a thermal cycle for ultra-supercritical parameters with live and reheated steam temperature of 700/720 [degrees]C was suggested. The analysis of the ultra-supercritical unit concerned a variant with a single and double steam reheat. All solutions presented in the paper were subject to a detailed thermodynamic analysis, as well as an economic one which also included CO2 emissions charges. The conducted economic analysis made it possible to determine the maximum value of investment expenditures at which given solutions are pro.table.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 3; 231-245
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical modeling of CO2 separation process
    Autorzy:
    Remiorz, L.
    Rulik, S.
    Dykas, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/240653.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CO2 separation
    thermoacoustic
    CFD
    separacja CO2
    termoakustyka
    Opis:
    Paper presents the results of numerical modelling of a rectangular tube filled with a mixture of air and CO2 by means of the induced standing wave. Assumed frequency inducing the acoustic waves corresponds to the frequency of the thermoacoustic engine. In order to reduce the computational time the engine has been replaced by the mechanical system consisting of a piston. This paper includes the results of model studies of an acoustic tube filled with a mixture of air and CO2 in which a standing wave was induced.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 1; 41-53
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical modelling of thermoacoustic phenomenon as contribution to thermoacoustic engine model
    Autorzy:
    Remiorz, L.
    Dykas, S.
    Rulik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943211.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska
    Tematy:
    thermoacoustic engine
    Rijke tube
    Opis:
    The presented paper shows our first step into the numerical modelling of the thermoacoustic phenomenon. The thermoacoustic effect has a great application potential, for instance, in thermoacoustic engines or thermoacoustic mixture separation. These two applications are in the centre of our interest. The modelling of thermoacoustic effects consists in a solution of transport equations, mass, momentum and energy, to identify the influence of heat transfer on the sonic oscillation and vice versa. The numerical modelling of such sensitive and sophisticated phenomena requires a high quality numerical tool. The commercial CFD code ANSYS CFX 12 was chosen as the numerical tool. This investigation will be supported by using the finite time thermodynamic theory. At the beginning preliminary numerical tests were performed in order to validate the numerical methods and the boundary conditions implemented in CFX. The numerical calculations of the Rijke tube were carried out and the results were validated against analytical relations.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2010, 14, 3; 257-269
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Numerical Study of The Heat Transfer Intensification Using High Amplitude Acoustic Waves
    Autorzy:
    Rulik, S.
    Wróblewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/177492.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cavity noise
    sound wave cooling
    flow over a cavity
    transient cooling
    blade cooling intensification
    Opis:
    The current practice in the efforts aiming to improve cooling conditions is to place emphasis on the application of non-stationary flow effects, such as the unsteady jet heat transfer or the heat transfer intensification by means of a high-amplitude oscillatory motion. The research presented in this paper follows this direction. A new concept is put forward to intensify the heat transfer in the cooling channels with the use of an acoustic wave generator. The acoustic wave is generated by a properly shaped fixed cavity or group of cavities. The sound generated by the cavity is a phenomenon analysed in various publications focused on the methods of its reduction. The phenomenon is related to the feedback mechanism between the vortices flowing from the leading edge and the acoustic waves generated within the cavity. The acoustic waves are generated by the interaction between the vortices and the cavity walls. Strong instabilities can be observed within a certain range of the free flow velocities. The investigations presented in this paper are oriented towards the use of the phenomenon for the purposes of the heat transfer process intensification. The first part of the work presents the numerical model used in the analysis, as well as its validation and comparison with empirical relations. The numerical model is constructed using the commercial CFD Ansys CFX-16.0 commercial program. The next part includes determining of the relationship between the amplitude of the acoustic oscillations and the cooling conditions within the cavity. The calculations are performed for various flow conditions.
    Źródło:
    Archives of Acoustics; 2018, 43, 1; 31-47
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Numerical Study of the Relation Between the Acoustic Generator Geometry and the Heat Transfer Conditions
    Autorzy:
    Rulik, S.
    Wróblewski, W.
    Rusin, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/140076.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cavity noise
    cavity cooling
    new cooling techniques
    acoustic cooling
    acoustic waves
    heat transfer in cavities
    thermoacoustics
    szum aerodynamiczny
    chłodzenie zewnętrzne
    nowe techniki chłodzenia
    chłodzenie akustyczne
    fale akustyczne
    przepływ ciepła
    termoakustyka
    Opis:
    Modern gas turbine systems operate in temperatures ranging from 1200°C to even 1500°C, which creates bigger problems related to the blade material thermal strength. In order to ensure appropriate protection of the turbine blades, a sophisticated cooling system is used. Current emphasis is placed on the application of non-stationary flow effects to improve cooling conditions, e.g., the unsteady-jet heat transfer or the heat transfer enhancement using high-amplitude oscillatory motion. The presented research follows a similar direction. A new concept is proposed of intensification of the heat transfer in the cooling channels with the use of an acoustic wave generator. The acoustic wave is generated by an appropriately shaped fixed cavity or group of cavities. The phenomenon is related to the coupling mechanism between the vortex shedding generated at the leading edge and the acoustic waves generated within the cavity area. Strong instabilities can be observed within a certain range of the free flow velocities. The presented study includes determination of the relationship between the amplitude of acoustic oscillations and the cooling conditions within the cavity. Different geometries of the acoustic generator are investigated. Calculations are also performed for variable flow conditions. The research presented in this paper is based on a numerical model prepared using the Ansys CFX-17.0 commercial CFD code.
    Źródło:
    Archive of Mechanical Engineering; 2018, LXV, 1; 5-26
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of CFD technique for modelling of the thermoacoustic engine
    Autorzy:
    Rulik, S.
    Remiorz, L.
    Dykas, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/239996.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silnik termoakustyczny
    termoakustyka
    CFD
    thermoacoustic
    thermoacoustic engine
    thermoacoustic regiferator
    Opis:
    The paper is concerned with an important issue from the field of thermoacoustics - the numerical modelling of the flow field in the thermoacoustic engine. The presented way of modelling is based on the solution to fundamental fluid mechanics equations that govern the flow of compressible, viscous, and heat-transferring gas. The paper presents the way of modelling the thermoacoustic engine, the way of conducting calculations and the results which illustrate the correctness of the selected computational technique.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 3; 175-190
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metamodel-Based Optimization of the Labyrinth Seal
    Autorzy:
    Rulik, S.
    Wróblewski, W.
    Frączek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/140287.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    labyrinth seal
    metamodel optimization
    neural network
    genetic algorithm
    evolutionary algorithm
    CFD optimization
    uszczelnienie labiryntowe
    optymalizacja oparta na metamodelu
    sieć neuronowa
    algorytm genetyczny
    algorytm ewolucyjny
    optymalizacja CFD
    Opis:
    The presented paper concerns CFD optimization of the straight-through labyrinth seal with a smooth land. The aim of the process was to reduce the leakage flow through a labyrinth seal with two fins. Due to the complexity of the problem and for the sake of the computation time, a decision was made to modify the standard evolutionary optimization algorithm by adding an approach based on a metamodel. Five basic geometrical parameters of the labyrinth seal were taken into account: the angles of the seal’s two fins, and the fin width, height and pitch. Other parameters were constrained, including the clearance over the fins. The CFD calculations were carried out using the ANSYS-CFX commercial code. The in-house optimization algorithm was prepared in the Matlab environment. The presented metamodel was built using a Multi-Layer Perceptron Neural Network which was trained using the Levenberg-Marquardt algorithm. The Neural Network training and validation were carried out based on the data from the CFD analysis performed for different geometrical configurations of the labyrinth seal. The initial response surface was built based on the design of the experiment (DOE). The novelty of the proposed methodology is the steady improvement in the response surface goodness of fit. The accuracy of the response surface is increased by CFD calculations of the labyrinth seal additional geometrical configurations. These configurations are created based on the evolutionary algorithm operators such as selection, crossover and mutation. The created metamodel makes it possible to run a fast optimization process using a previously prepared response surface. The metamodel solution is validated against CFD calculations. It then complements the next generation of the evolutionary algorithm.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 1; 75-91
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of pipeline transportation systems for carbon dioxide sequestration
    Autorzy:
    Witkowski, A.
    Majkut, M.
    Rulik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/240910.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    carbon dioxide
    dense phase
    pipeline transportation
    energy efficiency
    thermal insulation
    dwutlenek węgla
    transport przesyłowy
    energoefektywność
    izolacja termiczna
    Opis:
    A commercially available ASPEN PLUS simulation using a pipe model was employed to determine the maximum safe pipeline distances to subsequent booster stations as a function of carbon dioxide (CO2) inlet pressure, ambient temperature and ground level heat flux parameters under three conditions: isothermal, adiabatic and with account of heat transfer. In the paper, the CO2 working area was assumed to be either in the liquid or in the supercritical state and results for these two states were compared. The following power station data were used: a 900 MW pulverized coal-fired power plant with 90% of CO2 recovered (156.43 kg/s) and the monothanolamine absorption method for separating CO2 from flue gases. The results show that a subcooled liquid transport maximizes energy efficiency and minimizes the cost of CO2 transport over long distances under isothermal, adiabatic and heat transfer conditions. After CO2 is compressed and boosted to above 9 MPa, its temperature is usually higher than ambient temperature. The thermal insulation layer slows down the CO2 temperature decrease process, increasing the pressure drop in the pipeline. Therefore in Poland, considering the atmospheric conditions, the thermal insulation layer should not be laid on the external surface of the pipeline.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 1; 117-140
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza sprawności obiegu cieplnego ultra-nadkrytycznego bloku kondensacyjnego dla szeregowej konfiguracji skraplaczy
    The influence of application of a serial condenser for the ultra-critical power unit
    Autorzy:
    Wróblewski, W.
    Łukowicz, H.
    Rulik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/173112.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    obieg cieplny
    ultra-nadkrytyczny blok kondensacyjny
    skraplacz
    thermal cycle
    ultra-supercritical condensing unit
    condenser
    Opis:
    Przedmiotem niniejszej analizy jest dobór parametrów oraz konfiguracji układu chłodzenia dla bloku ultra-nadkrytycznego o mocy 900 MW. Analizę pracy skraplacza oparto o amerykańską normę Heat Exchange Institute. Przedstawione badania obejmują porównanie dwóch wariantów układu chłodzenia, które dotyczą konfiguracji równoległej oraz szeregowej pracy skraplacza. Układ równoległy jest powszechnie stosowany, a rozdzielenie strumienia wody chłodzącej na poszczególne skraplacze bądź sekcje skraplacza daje w nich jednakowe warunki kondensacji. W przypadku konfiguracji szeregowej całkowity strumień wody chłodzącej przepływa szeregowo przez skraplacz pierwszy, a następnie trafia do skraplacza drugiego. Takie rozwiązanie w stosunku do układu równoległego powoduje wzrost sprawności obiegu wynikający z obniżenia całkowitego ciśnienia w skraplaczu. Konfiguracja szeregowa powoduje, że obniżeniu ciśnienia w pierwszej sekcji skraplacza towarzyszy nieznaczny wzrost ciśnienia w drugiej sekcji skraplacza. Stąd też pole powierzchni wymiany ciepła drugiej sekcji skraplacza jest często zwiększone w celu poprawy warunków kondensacji. Niniejsza praca stanowi uzupełnienie oraz rozszerzenie przedstawionych w literaturze analiz. Dotyczy to w szczególności dokładnego uwzględnienia wpływu straty wylotowej turbiny niskoprężnej na wartość uzyskiwanych przyrostów sprawności obiegu cieplnego w przypadku konfiguracji szeregowej pracy skraplacza.
    The aim of this paper is the selection of parameters and configuration of the cooling system of 900 MW ultra-supercritical power unit. The performed analysis of the condenser was based on the Heat Exchange Institute standard. The presented studies include comparison of two variants of cooling water system. Both, the parallel and serial configuration of the condenser was investigated. Parallel cooling water system is widely used, and the separation of the cooling water stream into individual sections of the condenser or condensers give equal conditions of condensation. In the case of a serial configuration, the total flow of cooling water flows through the first condenser and then it goes to the second condenser. This causes the decrease of pressure in the first and increase of pressure in the second condenser. Hence, the heat exchange surface area of the second condenser is often increased to improve the conditions of condensation. This paper extends the analyzes presented in the literature. It particularly concerns the investigation of influence of the exhaust loss for obtained efficiency gains in case of the serial configuration of condenser.
    Źródło:
    Archiwum Energetyki; 2013, 43, 1/2; 117-127
    0066-684X
    Pojawia się w:
    Archiwum Energetyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of tip seal with honeycomb land in LP counter rotating gas turbine engine
    Autorzy:
    Wróblewski, W.
    Dykas, S.
    Bochon, K.
    Rulik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943216.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska
    Tematy:
    tip seal
    LP turbine
    honeycomb land
    optimization
    Opis:
    The goal of the presented work is an optimization of the geometrical configuration of the tip seal with a honeycomb land, to reduce the leakage flow in the counter-rotating LP turbine of a contra-rotating open rotor aero-engine. This goal was achieved with the use of the Ansys-CFX commercial code and an in-house optimization procedure. The detailed studies including the mesh influence, the stages of the computational domain simplification, and geometry variants are discussed. The optimization process is based on a single objective genetic algorithm (SOGA). The automatic grid generation process and the CFD calculations are based on scripts prepared under the Ansys-ICEM and Ansys-CFX software. The whole procedure is written in the Visual Basic for Applications language (VBA), which allows a direct access to the CAD software with the use of macros and allows a proper connection between the CAD environment and the CFD software. The described algorithm allows parallel computing. In addition to the optimization studies, a sensitivity analysis was also performed. For this purpose, the Elementary Effects Method (EEM) was used. This paper was written within the DREAM European project (Validation of Radical Engine Architecture Systems) of the 7th Framework Program of the European Union.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2010, 14, 3; 189-207
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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