水利水电技术2018，Vol.49Issue(3)：78-82,5.DOI:10.13928/j.cnki.wrahe.2018.03.012
微型高速离心泵多工况内部空化特性分析
Analysis on internal cavitation characteristics of micro-high speed centrifugal pump under mult-operation conditions
摘要
Abstract
Based on CFX software and RNG k-εturbulence model,the characteristics of cavitation inside of pump under different flow rates and different inlet pressures are studied herein.The relationship between the cavity number within the impeller and the variation of the impeller torque along with the cavitation coefficient,the original and main positions of the cavitation as well as the static pressure variation characteristics of the flow-passage are analyzed with the Rayleigh-Plesset equation-based homogeneous flow cavitation model.The results show that the cavity volume enlarges along with the decrease of the cavitation coefficient,while the cavitation originally forms at the front-edge of blade and the adjacent flow-passage.Following with the decrease of the inlet pressure,the low-pressure zones those induce cavitation concentrate at the mid-part between blade and flow-passage with non-uniform distribution.Under all the small flow rate operation conditions,the variation of torque decreases along with the decrease of the cavitation coefficient,while the torque is to be irregularly fluctuated and the critical points of all the curve changes are to gradually move forward,but the general changing trends are roughly the same.The characteristics of the internal cavitated flowpassage in micro-high speed centrifugal pump as well as the impact from cavitation on the stable pump operation performance studied herein can provide references for the design of the micro-high speed centrifugal pump with higher operation efficiency.关键词
微型高速离心泵/流量/空化特性/扭矩Key words
micro-high speed centrifugal pump/flow rate/cavitation characteristics/torque分类
水利科学引用本文复制引用
罗旭,宋文武,陈建旭,虞佳颖..微型高速离心泵多工况内部空化特性分析[J].水利水电技术,2018,49(3):78-82,5.基金项目
四川省科技厅项目(2016JY0187) （2016JY0187）
四川省教育厅重大培育项目(14CZ0013) （14CZ0013）
流体及动力机械教育部重点实验室开放基金(szjj2016-003) （szjj2016-003）
