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Rotating Choke and Choked Surge in an Axial Pump Impeller

Watanabe, Toshifumi    (Graduate School of Engineering Science, Osaka University   ); Sato, Hideyoshi    (Yamaha Motor Co., Ltd.   ); Henmi, Yasuhiko    (Yamaha Motor Co., Ltd.   ); Horiguchi, Hironori    (Graduate School of Engineering Science, Osaka University   ); Kawata, Yutaka    (Faculty of Engineering, Osaka Institute of Technology   ); Tsujimoto, Yoshinobu    (Graduate School of Engineering Science, Osaka University  );
  • 초록

    Unlike usual turbopump inducers, the axial flow pump tested operates very stably at design flow rate without rotating cavitation nor cavitation surge. Flow visualization suggests that this is because the tip cavity smoothly extends into the flow passage without the interaction with the leading edge of the next blade. However, at low flow rate and low cavitation number, choked surge and rotating choke were observed. Their correlation with the performance curve under cavitation is discussed and their instantaneous flow fields are shown.


  • 주제어

    Pump .   Cavitation .   Cavitation Instability .   Rotating Choke .   Choked Surge.  

  • 참고문헌 (8)

    1. Young, W. E., Murphy, R., and Reddecliff, J. M., 1972, “Study of Cavitating Inducer Instabilities,” Final Report, NACACR-123939, pp.1-149. 
    2. Kamijo, K., Shimura, T., and Watanabe, M., 1977, “An Experimental Investigation of Cavitating Inducer Instability,” ASME Paper, 77-WA/FW-14, pp.1-9. 
    3. Tsujimoto, Y., Kamijo, K., and Yoshida, Y., 1993, “A Theoretical Analysis of Rotating Cavitation in Inducers,” Transactions of the ASME, Journal of Fluids Engineering, Vol.115, No.1, pp.135-141. 
    4. Tsujimoto, Y., Watanabe S., and Horiguchi, H., 2008, “Cavitation Instabilities of Hydrofoils and Cascades,” International Journal of Fluid Machinery and Systems, Vol.1, No.1, pp.38-46.     
    5. Shimura, T., Yoshida, M., Kamijo, K., Uchiumi, M., and Yasutomi, Y., 2002, “A Rotating Stall Type Phenomenon Caused by Cavitation in LE-7A LH2 Turbopump,” JSME International Journal, Series B, Vol.45, No.1, pp.41-46. 
    6. Semenov, Y., Fujii, A., and Tsujimoto, Y., 2004, “Rotating Choke in Cavitating Turbopump Inducer,” Transactions of the ASME, Journal of Fluids Engineering, Vol.126, No.1, pp.87-93. 
    7. Watanabe, T., Kang, D., Cervone, A., Kawata, Y., and Tsujimoto, 2008, Y., “Choked Surge in a Cavitating Turbopump Inducer,” International Journal of Fluid Machinery and Systems, Vol.1, No.1, pp.64-75.     
    8. Yamamoto, K. and Tsujimoto, Y., 2009, “Backflow Vortex Cavitation and Its Effects on Cavitation Instabilities,” International Journal of Fluid Machinery and Systems,” Vol.2, No.1, pp.40-54.     

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