水力发电2018，Vol.44Issue(1)：68-72,5.
中比转速离心泵小流量工况下压力脉动特性
Pressure Fluctuation Characteristics of Centrifugal Pump with Medium Specific Speed at Low Flow Operation
摘要
Abstract
The unsteady flows for different operating conditions in centrifugal pump are numerically investigated by using Navier-Stokes equations and RNG k-ε turbulence model.The calculation results of external characteristic are in good agreement with experimental data.The pressure fluctuation in impeller has obvious periodic property under different flow conditions,the intensity of pressure fluctuation increases with the decrease of flow rate.The influence of low flow condition on impefler suction side is the most obvious.The dominant frequencies of pressure fluctuation on blade surface are the impeller rotating frequency.The amplitudes of pressure fluctuation increase gradually from impeller inlet to outlet.The maximum amplitude of pressure fluctuation appears in the condition of 30％ design flow and the value is about 3-4 times of that under design flow condition.The vortex in impeller is also periodically generated,developed and shed,which is the main cause of low operating efficiency,large pressure fluctuation and disturbed fluctuation waveform of centrifugal pump.关键词
中比转速离心泵/小流量工况/压力脉动/瞬态流线分布Key words
medium specific speed centrifugal pump/low flow operation/pressure fluctuation/transient streamline distribution分类
机械制造引用本文复制引用
王欣,孟根其其格..中比转速离心泵小流量工况下压力脉动特性[J].水力发电,2018,44(1):68-72,5.基金项目
国家自然科学基金资助项目(51579006) （51579006）
国家自然科学基金资助项目(51679122) （51679122）
北京市自然科学基金资助项目(3164045) （3164045）
内蒙古自治区高等学校科学研究项目(NJZY17450). （NJZY17450）
