본문 바로가기
HOME> 논문 > 논문 검색상세

논문 상세정보

Prediction of Cavitation Intensity in Pumps Based on Propagation Analysis of Bubble Collapse Pressure Using Multi-Point Vibration Acceleration Method

Fukaya, Masashi    (Mechanical Engineering Research Laboratory, Hitachi, Ltd.   ); Ono, Shigeyoshi    (Engineering Cluster, Hitachi Technologies and Services, Ltd.   ); Udo, Ryujiro    (Mechanical Engineering Research Laboratory, Hitachi, Ltd.  );
  • 초록

    We developed a 'multi-point vibration acceleration method' for accurately predicting the cavitation intensity in pumps. Pressure wave generated by cavitation bubble collapse propagates and causes pump vibration. We measured vibration accelerations at several points on a casing, suction and discharge pipes of centrifugal and mixed-flow pumps. The measured vibration accelerations scattered because the pressure wave damped differently between the bubble collapse location and each sensor. In a conventional method, experimental constants are proposed without evaluating pressure propagation paths, then, the scattered vibration accelerations cause the inaccurate cavitation intensity. In our method, we formulated damping rate, transmittance of the pressure wave, and energy conversion from the pressure wave to the vibration along assumed pressure propagation paths. In the formulation, we theoretically defined a 'pressure propagation coefficient,' which is a correlation coefficient between the vibration acceleration and the bubble collapse pressure. With the pressure propagation coefficient, we can predict the cavitation intensity without experimental constants as proposed in a conventional method. The prediction accuracy of cavitation intensity is improved based on a statistical analysis of the multi-point vibration accelerations. The predicted cavitation intensity was verified with the plastic deformation rate of an aluminum sheet in the cavitation erosion area of the impeller blade. The cavitation intensities were proportional to the measured plastic deformation rates for three kinds of pumps. This suggests that our method is effective for estimating the cavitation intensity in pumps. We can make a cavitation intensity map by conducting this method and varying the flow rate and the net positive suction head (NPSH). The map is useful for avoiding the operating conditions having high risk of cavitation erosion.


  • 주제어

    Cavitation intensity .   Bubble collapse .   Pressure propagation .   Vibration acceleration .   Pump.  

  • 참고문헌 (9)

    1. Konno, A., et al., 2001, “On the collapsing behavior of cavitation bubble clusters,” Proc. of Fourth Int. Symposium onCavitation (CAV2001), Pasadena, CA/USA, session A8.003. 
    2. Soyama, H. and Kumano, H., 2002, “The Fundamental Threshold Level - a New Parameter for Predicting Cavitation Erosion Resistance”, J. of Testing and Evaluation, ASTM Int., pp. 421-431. 
    3. Maekawa, M., et. al., 2003, “Study of Cavitation on Hydraulic Turbine Runners,” Proc. of 5th Int. Symposium on Cavitation(CAV2003), Osaka, Japan, Cav03-OS-6-015. 
    4. Turbomachinery Society of Japan, 2003, “TSJ Guideline; Guideline for Prediction and Evaluation of Cavitation Erosion inPumps (in Japanese),” TSJ G 001:2003. (in Japanese) 
    5. Fukaya, M., et. al., 2006, “Experimental Prediction Method of Cavitation Erosion in Pumps by Using Aluminum Sheet,” Proc. of 6th Int. Symposium on Cavitation (CAV2006), Wageningen, The Netherlands, 104. 
    6. Udo, R., et. al., 2006, “Measurement of Cavitation Intensity in Pumps by Using Aluminum Sheet,” Proc. of 6th Int. Symposiumon Cavitation (CAV2006), Wageningen, The Netherlands, 122. 
    7. Ono Sokki, http://www.onosokki.co.jp/HP-WK/products/keisoku/soundvib/np2000_series.html. 
    8. Ono Sokki, http://www.onosokki.co.jp/HP-WK/products/keisoku/data/ds2000.html. 
    9. Hitachi Technologies and Services, Ltd., http://www.hitachi-ts.co.jp/business/engineering/testing/laser3d/index.html. 

 활용도 분석

  • 상세보기

    amChart 영역
  • 원문보기

    amChart 영역

원문보기

무료다운로드
유료다운로드

유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.

원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.

NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.

이 논문과 함께 출판된 논문 + 더보기