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    Wyświetlanie 1-9 z 9
    Tytuł:
    The influence of steam extraction parameters on unsteady rotor forces
    Autorzy:
    Rządkowski, R.
    Gnesin, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933176.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska
    Tematy:
    steam extraction
    blade
    unsteady forces
    Opis:
    Aerodynamic unsteady forces of rotor blades in a turbine stage with steam extraction were calculated and blade failure was reported. A numerical calculation of the 3D transonic flow of an ideal gas through turbomachinery blade rows moving one in relation to another is presented. An ideal gas flow through mutually moving stator and rotor blades with periodicity on the whole annulus is described with unsteady Euler conservation equations, integrated using the explicit monotonous finite-volume difference scheme of Godunov-Kolgan and a moving hybrid H-H grid. In order to find the pressure distribution of steam parameters behind the rotor blades, calculations were performed for a steady flow through the stage and the steam extraction channels using the SPARC program and the unsteady forces of the rotor blade were calculated for four steam extraction conditions. For the maximal steam extraction the 10th harmonic of the axial force and moment was found to be close to the first natural frequency of the bladed disc with one nodal diameter. Thus, steam extraction can be the cause of the blade's failure.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 3; 253-261
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-excited vibration of a palisade in 2D subsonic, transonic and supersonic flow
    Autorzy:
    Rządkowski, R.
    Kovalyov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1941712.pdf
    Data publikacji:
    2000
    Wydawca:
    Politechnika Gdańska
    Tematy:
    blades
    flutter
    vibrations
    Opis:
    In recent years coupled fluid-structure problems have appeared. The computational method used to solve this problem was based on a time-marching algorithm, so it was natural to consider a time domain flutter analysis method. The time domain method of flutter analysis is based on the simultaneous integration in time of the equation of motion for the structure and the fluid. The flow model is capable of representing 2D flows over a wide Mach number range from low subsonic to supersonic, including transonic flows. The aerodynamic model fully accounts for blade thickness and camber and the angle-of-attack effects. The unsteady Euler equations are integrated by using the explicit monotonous second-order accurate Godunov scheme. The blade is modelled on the basis of extended beam theory including a bending-bending-torsional vibration and also by the simple two-degree of freedom model. The equation of motion is obtained by using the extended Hamilton's principle and the Ritz method. The direct integration method is used to find a solution of the coupled fluid-structure problem. In this work the comparison of numerical and experimental results is presented for the first and fourth standard configurations.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 1; 49-80
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural frequencies and modes shapes of two rigid bladed discs on the shaft
    Autorzy:
    Rządkowski, R.
    Sokołowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955709.pdf
    Data publikacji:
    2004
    Wydawca:
    Politechnika Gdańska
    Tematy:
    natural frequencies
    bladed disc-shaft
    Opis:
    The dynamic behavior of a rotor consisting of two bladed discs on a solid shaft is considered. The effect of shaft flexibility on the dynamic characteristics of the bladed discs and the coupling effects between the shaft and bladed disc modes are investigated. Results presented for various cases with differing blade flexibility show clearly the coupling effects in a bladed disc-shaft system. Interference diagrams are developed, from which the dynamic behavior of a system can be predicted for differing flexibility relationships between the solid shafts and the bladed discs. In this study, the global rotating mode shapes of flexible bladed disc-shaft assemblies have been calculated. Rotational effects such as centrifugal stiffening have been accounted for, and all the possible couplings between the flexible parts have been allowed. Gyroscopic effects have been included in the shaft with two discs. Calculated natural frequencies obtained from the blade, shaft, bladed disc and shaft with two discs have been checked to determine resonance conditions and coupling effects. The calculations have shown the influence of the shaft on the natural frequencies of the bladed discs up to one nodal diameter frequencies. The torsional frequency of the shaft with two discs is coupled with the zero nodal diameter modes of the single bladed discs. The bending modes of the shaft are coupled with one nodal diameter modes of the bladed discs. It is shown that including the shaft in the bladed discs model is important from a designer's point of view and can change the spectrum of frequencies considerably.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 1; 51-69
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D inviscid flutter of rotor blades and stator/rotor stage
    Autorzy:
    Rządkowski, R.
    Gnesin, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1967639.pdf
    Data publikacji:
    2001
    Wydawca:
    Politechnika Gdańska
    Tematy:
    3D inviscid flutter
    flutter
    blades
    stator/rotor stage
    rotor blades
    unsteady forces
    3D finite element model
    Opis:
    The approach is based on solution of the coupled aerodynamic-structure problem for 3D flow through the turbine stage in which fluid and dynamic equations are integrated simultaneously in time. An ideal gas flow through the mutually moving stator and rotor blades with periodicity on the whole annulus is described by unsteady Euler conservation equations, which are integrated using the explicit monotonous finite-volume difference scheme of Godunov-Kolgan and moving hybrid H-H grid. The structure analysis uses the modal approach and 3D finite element model of a blade. A calculation was performed for the last stage of the steam turbine with rotor blades of 0.765 m.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 4; 567-577
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frequencies and modes of rotating flexible shrouded bladed discs-shaft assemblies
    Autorzy:
    Sokołowski, J.
    Rządkowski, R.
    Kwapisz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954654.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Gdańska
    Tematy:
    blades
    discs
    shaft
    free vibration
    Opis:
    It is now increasingly necessary to predict accurately, at the design stage and without excessive computing costs, the dynamic behaviour of rotating parts of turbomachines, so that resonant conditions at operating speeds are avoided. In this study, global rotating mode shapes of flexible shrouded bladed disc-shaft assemblies are calculated. The rotating modes have been calculated by using a finite element cyclic symmetry approach. Rotational effects, such as centrifugal stiffening have been accounted for, and all the possible couplings between the flexible parts have been allowed. Gyroscopic effects have been neglected. The numerical results have been compared with the experimental. The calculations show the influence of shaft flexibility on the natural frequencies of shrouded bladed discs up to four nodal diameters for the two first frequencies series.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 2; 215-231
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural frequencies of tuned and mistuned bladed discs on a shaft
    Autorzy:
    Rządkowski, R.
    Drewczyński, M.
    Kubitz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955332.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska
    Tematy:
    bladed disc
    blade
    mistuning
    Opis:
    The dynamic behaviour of a rotor consisting of two tuned and mistuned bladed discs on a solid shaft is considered. The effect of the shaft's flexibility on the dynamic characteristics of the bladed discs and the coupling effects between the shaft and bladed disc modes are investigated. Results show clearly the coupling effects in a bladed disc-shaft system. Interference diagrams are developed, from which the dynamic behaviour of a bladed disc can be predicted for varying flexibility relationships between solid shafts and bladed discs. The global rotating mode shapes of flexible tuned and mistuned bladed disc-shaft assemblies are calculated. Rotational effects, such as centrifugal stiffening, are accounted for and all the possible couplings between the flexible parts are allowed. Calculated natural frequencies obtained from the blade, the bladed disc and the shaft with two discs are checked to discover resonance conditions and coupling effects. It is shown that blade mistuning strongly affects the interaction between flexible bladed discs and a flexible shaft. This interaction affects the flexible bladed disc modes and is not restricted to the modes with zero, one and two nodal diameters. The torsional frequency of the shaft with two bladed discs is coupled with the zero nodal diameter modes of the single bladed discs. It is shown that including the shaft in the bladed discs model is important from the designer's point of view and may alter the spectrum of frequencies considerably.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 3; 275-289
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelowanie strukturalnej warstwy nośnej łożyska foliowego
    Numerical modelling of the structural layer of foil bearing
    Autorzy:
    Kiciński, J.
    Żywica, G.
    Rządkowski, R.
    Drewczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/386867.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    modelowanie
    łożysko foliowe
    model numeryczny
    modelling
    foil bearing
    numerical models
    Opis:
    Łożyska foliowe dzięki swoim wielu zaletom znajdują w ostatnim czasie coraz więcej zastosowań. Dzisiejszy poziom wiedzy pozwala na modelowanie własności łożysk foliowych przede wszystkim na podstawie badań eksperymentalnych, gdyż dotychczas opracowane modele obliczeniowe nie pozwalają na otrzymanie wiarygodnych wyników. W niniejszej pracy przedstawiono wstępny etap prac nad modelowaniem strukturalnej warstwy nośnej łożyska foliowego. Opracowano model dyskretny fragmentu folii gładkiej i falistej oraz przeprowadzono symulację komputerową pracy takiego układu. Otrzymany model numeryczny został następnie zweryfikowany eksperymentalnie. Uzyskano dużą zgodność wyników symulacji i eksperymentu, co świadczy o dużej przydatności opracowanego modelu w przewidywaniu własności łożysk foliowych.
    Foil bearings fulfil most of the requirements of novel oil-free turbomachinery. Only the experimental investigation of foil bearings giving us the fundamental knowledge of their behaviour, because of the luck of good numerical models. This work presented the preliminary stage of numerical modelling of the structural layer of foil bearing. The FEM model of bump and top foil was prepared and mutual motion was analyzed. The results of FEM model were verified experimentally. A good agreement between numerical simulation and experiment was obtained.
    Źródło:
    Acta Mechanica et Automatica; 2008, 2, 1; 45-50
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rotor blade vibration simulator of steam turbine with aliasing frequencies up to 25 Hz
    Autorzy:
    Piechowski, L.
    Rządkowski, R.
    Troka, P.
    Piechowski, P.
    Szczepanik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/175409.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tip-timing
    rotor blade vibration
    blade vibration simulator
    Opis:
    The tip-timing measurement of rotor blade vibration of a real turbine is very expensive. An electronic simulator of unshrouded steam turbine rotor blade vibrations for aliasing frequencies up to 25 Hz is presented in this paper. The results of the simulated blade vibrations were compared with ones carried out on a real steam turbine. The simulator can be also used to: calibrate the measurement channels, help in the designing and manufacturing new tip-timing systems, and check the reliability of other tip-timing systems.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 134; 121-129
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Free vibrations analysis of shrouded bladed discs with one loose blade
    Autorzy:
    Rządkowski, R.
    Kwapisz, L.
    Drewczyński, M.
    Szczepanik, R.
    Rao, J.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955347.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska
    Tematy:
    blade
    shrouded bladed disc
    free vibration
    Opis:
    As a failure of rotor blades in a gas turbine was reported, the rotating-mode shapes of flexible shrouded bladed disc assemblies were calculated using a finite element approach. Rotational effects, such as centrifugal stiffening were accounted for, and all couplings between the flexible parts were allowed. The spin softening effects were neglected. A dynamic analysis of the shrouded bladed disc demonstrated that it was designed with a sufficient safety region of resonance. In case of one blade getting loose, it is vibrating in resonance.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 1; 83-95
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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