文献类型：期刊文献

中文题名：Numerical Study of Unsteady Flows with Cavitation in a High-Speed MicroCentrifugal Pump

英文题名：Numerical Study of Unsteady Flows with Cavitation in a High-Speed Micro Centrifugal Pump

作者：Li Yeqiang[1];Yuan Shiwei[2];Lai Huanxin[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Shanghai First Fluid Machinery Co Ltd, Shanghai 201709, Peoples R China

年份：2017

卷号：26

期号：1

起止页码：18

中文期刊名：Journal of Thermal Science

外文期刊名：JOURNAL OF THERMAL SCIENCE

收录：;EI(收录号：20170403268555);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000391416800003)】；CSCD:【CSCD2017_2018】；

基金：The study in this paper is funded by the National Natural Science Foundation of China under Grants 51176048 and 51576067.

语种：英文

中文关键词：Centrifugal pumps;Impellers;Pumps;Unsteady flow

外文关键词：Micro-centrifugal pump; Unsteady flow; Cavitation; Pressure fluctuation

摘要：The unsteady flows caused by the interaction between the impeller and the volute in a high-speed micro centrifugal pump are numerically studied. The internal flows of both with and without cavitations are analyzed using the CFX. The characteristics of unsteady pressure on the blade surfaces and the symmetric plane of the volute are presented and compared. The results show that the amplitudes of pressure fluctuations of critical cavitation on the blade pressure surface (PS) are bigger as compared with those at the non-cavitation condition, but on the suction surface (SS), the situation is on the contrary. When cavitation occurs, reduction of load in the impeller is a result. In the present study, such reduction of load is observed mainly on the first half of the blades. Pressure fluctuations at five monitoring points, denoted by WK1 to WK5 in the volute, are also analyzed. No matter at the critical cavitation or at the non-cavitation conditions, the monitored pressure fluctuations are at the same frequencies, which equal to the blade passing frequency (BPF) and its multiples. However, the amplitudes of the fluctuations at critical cavitation condition are considerably stronger, as compared with those for without cavitation. ? 2017, Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg.
The unsteady flows caused by the interaction between the impeller and the volute in a high-speed micro centrifugal pump are numerically studied. The internal flows of both with and without cavitations are analyzed using the CFX. The characteristics of unsteady pressure on the blade surfaces and the symmetric plane of the volute are presented and compared. The results show that the amplitudes of pressure fluctuations of critical cavitation on the blade pressure surface (PS) are bigger as compared with those at the non-cavitation condition, but on the suction surface (SS), the situation is on the contrary. When cavitation occurs, reduction of load in the impeller is a result. In the present study, such reduction of load is observed mainly on the first half of the blades. Pressure fluctuations at five monitoring points, denoted by WK1 to WK5 in the volute, are also analyzed. No matter at the critical cavitation or at the non-cavitation conditions, the monitored pressure fluctuations are at the same frequencies, which equal to the blade passing frequency (BPF) and its multiples. However, the amplitudes of the fluctuations at critical cavitation condition are considerably stronger, as compared with those for without cavitation.