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Wyszukujesz frazę "Banaszkiewicz, M." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Numerical investigation of creep behaviour of high-temperature steam turbine compone
    Autorzy:
    Banaszkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175375.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    creep
    lifetime assessment
    steam turbine
    Opis:
    The paper presents a model for creep basing on the so-called characteristic creep strain. It illustrates its application in computations of old steam turbines components. The presented model is a modification of the Norton model which relates the stress exponent to the creep rupture strength and current stress. Creep strain is a function of the above two quantities, i.e., rupture strength and current stress, and acharacteristic creep strain which is material constant for a given time and temperature. Computational examples regard the rotating and pressure components analysed using the finite element method.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 5-15
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Steam turbines start-ups
    Autorzy:
    Banaszkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175428.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    turbine
    numerical computations
    liquid flow parameters
    Opis:
    The article presents a procedure and the chosen results of numerical computations of liquid flow parameters, which use the data from their measurements realized on the test stand, for the model of formed suction intake with a rib, supplied by the screened open wet well. Comparative analysis of numerical computations and these determined by measurements, did concern the standard flow acceptance criteria.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 169-198
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A methodology for online rotor stress monitoring using equivalent Green’s function and steam temperature model
    Autorzy:
    Banaszkiewicz, M.
    Dominiczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/175458.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Steam turbine
    thermal stress
    Green's functions
    Duhamel’s integral
    Opis:
    The requirement of high operational flexibility of utility power plants creates a need of using online systems for monitoring and control of damage of critical components, e.g., steam turbine rotors. Such systems make use of different measurements and mathematical models enabling calculation of thermal stresses and their continuous control. The paper presents key elements of the proposed system and discusses their use from the point of view of thermodynamics and heat transfer. Thermodynamic relationships, well proven in design calculations, were applied to calculate online the steam temperature at critical locations using standard turbine measurements as input signals. The model predictions were compared with operational data from a real power plant during a warm start-up and show reasonably good accuracy. The effect of variable heat transfer coefficient and material properties on thermal stresses was investigated numerically by finite element method (FEM) on a cylinder model, and a concept of equivalent Green’s function was introduced to account for this variability in thermal stress model based on Duhamel’s integral. This approach was shown to produce accurate results for more complicated geometries by comparing thermal stresses at rotor blade groove computed using FEM and Duhamel’s integral.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 133; 13-37
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A verification approach to thermoelastic steam turbine rotor analysis during transient operation
    Autorzy:
    Dominiczak, K.
    Banaszkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175490.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam turbine
    thermal stress
    thermal growth
    differential expansion
    Opis:
    This paper presents a verification approach to thermoelastic steam turbine rotor analysis. Neither temperature nor stresses are measured on the rotor surface in utility power plants. Therefore analysis of the steam turbine rotor can be verified only based on absolute and differential thermal expansion measurements in vicinity of the steam turbine. Absolute and differential expansion measurements and steam turbine fixed points arrangement allow to calculate thermal growth of the steam turbine rotor during transients. Thermal growth of the rotor can be a baseline for the calculation using a numerical model.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 131; 55-65
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of the onset of condensation in the IMP PAN nozzle for cases without the appearance of shock waves in the steam flow
    Autorzy:
    Kornet, S.
    Banaszkiewicz, M.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175439.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spinodal
    binodal
    spontaneous condensation
    SCWS model
    IMP PAN nozzle
    wilson line
    Opis:
    The present paper focuses on the prediction of the spontaneous condensation phenomena in the wet steam flow depending on the inlet temperature. The basic tests including comparison with experimental data have been performed using the planar symmetrical nozzle with the de Laval geometry (IMP PAN nozzle). It was assumed in calculations that steam is pure and does not contain heterogeneous sources of condensation. Numerical analysis was performed for boundary conditions which correspond to the flow regime without the shock wave. The present work includes simulations results of the onset of condensation and shows whether initiation of phase transition is located in the region between a spinodal and a binodal. Numerical results along the nozzle axis are presented on thermodynamic diagrams for all considered flow conditions.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2017, 138; 107-123
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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