流体机械2025，Vol.53Issue(2)：50-57,8.DOI:10.3969/j.issn.1005-0329.2025.02.007
低比转速离心泵临界空化特性研究
Research on characteristics of critical cavitation in low specific speed centrifugal pump
摘要
Abstract
In order to study the internal flow field and induced pressure pulsation phenomena at the inception of cavitation and to determine a reasonable critical cavitation criterion,this paper conducted cavitation experiment on a low specific speed centrifugal pump and carried out steady and unsteady CFD simulations based on the RNG k-ε turbulence model and Rayleigh-Plesset cavitation model.The errors of efficiency and head are within 3%.Energy performance,flow field,and pulsation analyses were conducted under both non-cavitating conditions and different degrees of cavitation.The results indicate that the overall flow state is stable,and that the transport and collapse of local bubbles cause turbulent dissipation,leading to low-frequency pressure pulsation when cavitation triggers a 1%efficiency drop.When the head drops by 3%,the flow state in the pump is disturbed with vortex and large energy loss,and the wide band pressure pulsation which is easy to cause the vibration and noise of the pump body is induced.In the design of low-specific-speed centrifugal pump,it is recommended to set the critical cavitation margin to the device cavitation margin and above when the efficiency is reduced by 1%to ensure the stable operation of the pump.The research results can provide reference for the optimization design of low specific speed centrifugal pumps.关键词
空化/离心泵/数值模拟/压力脉动/流场分析Key words
cavitation/centrifugal pump/numerical simulation/pressure pulsation/flow filed analysis分类
机械工程引用本文复制引用
赵奇峰,刘德民,赵林,王钊宁..低比转速离心泵临界空化特性研究[J].流体机械,2025,53(2):50-57,8.基金项目
四川省科技计划资助项目(2022ZDZX0041) （2022ZDZX0041）
