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    Wyświetlanie 1-4 z 4
    Tytuł:
    Comparison of methods for the determination of Tesla turbine performance
    Autorzy:
    Rusin, Krzysztof
    Wróblewski, Włodzimierz
    Strozik, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/280194.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    Tesla turbine
    roughness
    radial turbine
    Opis:
    A numerical and experimental investigation of the Tesla turbine is presented in the paper. The experiment is conducted for various inlet pressure and load. The roughness of the rotor disc is determined as it is a key factor to obtain high turbine efficiency and power. The numerical investigations are performed for the same conditions as in the experiment. The computational results are compared with the analytical model. Comparison of performance characteristics show a relatively good agreement between the experiment and CFD. The analytical model overestimates distributions of pressure and circumferential velocities, although the predicted power is on the similar level as in the experiment and CFD.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 563-575
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on unsteady cavitating flow around a Clark-Y 11.7% hydrofoil
    Autorzy:
    Homa, Dorota
    Wróblewski, Włodzimierz
    Majkut, Mirosław
    Strozik, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/280808.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    cavitation
    flow simulation
    flow visualization
    homogeneous cavitation model
    Opis:
    The paper concerns experimental and numerical investigations focused on the cloud cavitation phenomenon over a hydrofoil. The results of flow visualization by means of a high- -speed camera are presented. The cavitation cycles including vapour structures occurrence, development and collapse were recorded and described. Within the numerical investigation, transient calculations of cavitating flow were performed. OpenFOAM software was used. To model mass transfer between phases, the Kunz cavitation model was chosen. Turbulences were modelled by means of k-ω SST model. The vapour areas appearance, their shapes and changes in time were described and compared with experimental results. The characteristic features of cavitating flow were observed, however further adjustment of the cavitation model was advised.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 765-777
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental analysis on unsteady characteristics of sheet/cloud cavitating Venturi flow under the effect of dissolved air
    Autorzy:
    Malekshah, Emad Hasani
    Wróblewski, Włodzimierz
    Bochon, Krzysztof
    Majkut, Mirosław
    Rusin, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2134932.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cavitating flow
    venturi nozzle
    dissolved air
    unsteady characteristic
    experimental observation
    Opis:
    The highly dynamic and unsteady characteristics of the cavitating flow cause many negative effects such as erosion, noise and vibration. Also, in the real application, it is inevitable to neglect the dissolved air in the water, although it is usually neglected in the previous works to reduce the complexity. The novelty of the present work is analysing the impact of dissolved air on the average/unsteady characteristics of Venturi flow by conducting sets of experimental tests. For this purpose, two different amounts of dissolved air at five pressure levels (i.e. five different sets of cavitation numbers) were considered in the study of cavitating flow inside a Venturi nozzle. The fast Fourier transform analysis of pressure fluctuations proved that the shedding frequency reduces almost by 50% to 66%, depending on the case, with adding the amount of dissolved air. However, the reduction of 14% to 25% is achieved by the vibration transducers. On the other hand, the cavity enlarges as well as bubbly flow is observed in the test chamber at a higher level of dissolved air. Furthermore, it is observed that the re-entrant jet, as the main reason for the cavity detachment, is more effective for the detachment process in cases with a lower level of dissolved air, where the re-entrant jet front penetrates more toward the leading edge.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 3; 63--84
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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