某离心泵内部流场非定常空化分析  

Analysis of Unsteady Cavitation in A Centrifugal Pump

作　　者：邓志强 蒋佳睿 刘小兵[1] DENG Zhi-qiang;JIANG Jia-rui;LIU Xiao-bing(Key Laboratory of Fluid and Power Machinery,Ministry of Education,Xihua University,Chengdu 610039,China)

机构地区：[1]西华大学流体及动力机械教育部重点实验室,四川成都610039

出　　处：《水电能源科学》2021年第6期166-170,共5页Water Resources and Power

基　　金：国家自然科学基金项目(51279172)。

摘　　要：为研究某小型离心泵转轮空化情况,在设计工况下应用SSTκ-ω湍流及Zwart-Gerber-Belamri空化模型对小型离心泵全流道进行数值模拟计算与分析,探讨其内部空化特性。结果表明,空泡率先出现在叶片头部近吸力面区域且进口压力梯度变化较均匀,叶轮进口处压力值最低;随着空化余量的降低,空泡下游区域的压力梯度变化增大,局部扰动增强,随着漩涡向下游发展,流动的不稳定性加剧,最明显的特征表现为水泵扬程降至0.98m,严重影响离心泵做功能力。In order to study the cavitation of a small centrifugal pump runner,SSTκ-ωturbulence model and ZwartGerber-Belamri cavitation model were used to simulate and analyze the whole flow channel of a small centrifugal pump under the design operating condition,and the internal cavitation characteristics were studied.The results show that the cavitation first appears in the region near the suction surface of the blade head,and the inlet pressure gradient changes more evenly,and the pressure value at the impeller inlet is the lowest;With the decrease of cavitation margin,the change of pressure gradient in the downstream region of the cavitation increases,and the local disturbance increases.With the development of the vortex toward the downstream,the flow instability is intensified.The most obvious characteristic is that the pump head drops to 0.98 m,and the work capacity of centrifugal pump is seriously affected.

关 键 词：离心泵 非定常 空化 数值模拟 

分 类 号：TV131.4[水利工程—水力学及河流动力学] TH311[机械工程—机械制造及自动化]