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Large Eddy Simulation of the Dynamic Response of an Inducer to Flow Rate Fluctuations

Kang, Dong-Hyuk    (Graduate School of Engineering Science, Osaka University   ); Yonezawa, Koichi    (Graduate School of Engineering Science, Osaka University   ); Ueda, Tatsuya    (Graduate School of Engineering Science, Osaka University   ); Yamanishi, Nobuhiro    (Japan Aerospace Exploration Agency   ); Kato, Chisachi    (Institute of Industrial Science, Tokyo University   ); Tsujimoto, Yoshinobu    (Graduate School of Engineering Science, Osaka University  );
  • 초록

    A Large Eddy Simulation (LES) of the flow in an inducer is carried out under flow rate oscillations. The present study focuses on the dynamic response of the backflow and the unsteady pressure performance to the flow rate fluctuations under non-cavitation conditions. The amplitude of angular momentum fluctuation evaluated by LES is larger than that evaluated by RANS. However, the phase delay of backflow is nearly the same as RANS calculation. The pressure performance curve exhibits a closed curve caused by the inertia effect associated with the flow rate fluctuations. Compared with simplified one dimensional evaluation of the inertia component, the component obtained by LES is smaller. The negative slope of averaged performance curve becomes larger under unsteady conditions. From the conservations of angular momentum and energy, an expression useful for the evaluation of unsteady pressure rise was obtained. The examination of each term of this expression show that the apparent decrease of inertia effects is caused by the response delay of Euler's head and that the increase of negative slope is caused by the delay of inertial term associated with the delay of backflow response. These results are qualitatively confirmed by experiments.


  • 주제어

    Inducer .   Backflow Vortex .   Dynamic Response to flow rate fluctuation .   Large Eddy Simulation.  

  • 참고문헌 (12)

    1. Yokota, K., Kurahara, K., Kataoka, D., Tsujimoto, Y., 1998, “A study of Swirling Backflow and a Vortex Structure in the Inlet of an Inducer, ” Journal of the Japan Society of Mechanical Engineers, 64-622, pp. 51-58. 
    2. Qiao, X., Horiguchi, H., Tsujimoto, Y., 2007, “Response of Backflow to Flow Rate Fluctuations, ASME, Vol. 139, pp. 350-358. 
    3. Yamanishi, N., Fukao, S., Qiao, X., Kato. C., Tsujimoto. Y., 2007, “LES simulation of Backflow vortex Structure at the Inlet of Inducer, ASME,” Vol. 139, pp. 587-594. 
    4. Acosta, A. J., 1958, “An Experimental Study of Cavitating Inducers,” Proceedings of the Second Symposium on Naval Hydrodynamics, pp. 533-557. 
    5. Acosta, A, Tsujimoto, Y., Yoshida, Y., Azuma, S., 2001, “Effects of Leading Edge Sweep on the Cavitation Characteristics of Inducer Pumps,” International Journal of Rotating Machinery, Vol. 7, No. 6, pp. 397-404. 
    6. Kamijo, K., Yoshida, M., Tsujimoto, Y.,1993, “Hydraulic and Mechanical Performance of LE-7 LOX Pump Inducer,” Journal of Propulsion and Power, Vol. 9, No. 6. 
    7. Kato, C., Kaiho, M., Manabe, A., 2003, “An Overset Finite-Element Large-Eddy Simulation Method with Applications to Turbomachinery and Aeroacoustics,” ASME, Journal of Applied mechanics, Vol. 70, pp. 32-43. 
    8. Yamamoto, K.,1992, “Instability in a Cavitating Centrifugal Pump_3rd Report: Mechanism of Low Cycle System Oscillation, ” Journal of the Japan Society of Mechanical Engineers , 58-545, pp. 180-186. 
    9. Yamamoto, K., Tsujimoto, Y., “A Backflow Vortex Cavitation and Its Effect on Cavitation Instabilities,” International Journal of Fluid Machinery and Systems, Vol. 2, No. 1, pp. 40-54. 
    10. Ohashi, H., 1968, “Analytical and Experimental study of Dynamic Characteristics of Turbopumps,” NASA TN D-4298, pp. 1-109. 
    11. Kawata, Y., Tanaka, T., Yasuda, O., Takeuchi, T., 1988, “Measurement of the transfer matrix of a prototype multi-stage centrifugal pump,” ImechE, C346/88. 
    12. Lacoppozi, M., Lingnarlol, V., Prevel, D.,1993, “Pogo Characterization of Ariane V Turbopump Lox Pump with Hot Water,” AIAA-93-2134. 

 저자의 다른 논문

  • Kang, Dong-Hyuk (4)

    1. 2008 "Choked Surge in a Cavitating Turbopump Inducer" International journal of fluid machinery and systems 1 (1): 64~75    
    2. 2009 "Cause of Cavitation Instabilities in Three Dimensional Inducer" International journal of fluid machinery and systems 2 (3): 206~214    
    3. 2009 "Inducer Design to Avoid Cavitation Instabilities" International journal of fluid machinery and systems 2 (4): 439~448    
    4. 2010 "Suppression of Cavitation Instabilities in an Inducer by Circumferential Groove and Explanation of Higher Frequency Components" International journal of fluid machinery and systems 3 (2): 137~149    

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