基于空泡溃灭势能的泵内空化空蚀特性  

Cavitation and cavitation erosion characteristics in pump based on cavitation bubble collapse energy

作　　者：李林敏 宁望辉 杨顺银 陈小光 李晓多 张祥 李林锋 LI Linmin;NING Wanghui;YANG Shunyin;CHEN Xiaoguang;LI Xiaoduo;ZHANG Xiang;LI Linfeng(School of Mechanical Engineering,Zhejiang Sci-Tech University,Hangzhou,Zhejiang 310018,China;Ebara Great Pumps Co.Ltd.,Wenzhou,Zhejiang 325000,China)

机构地区：[1]浙江理工大学机械工程学院,浙江杭州310018 [2]嘉利特荏原泵业有限公司,浙江温州325000

出　　处：《排灌机械工程学报》2024年第12期1203-1210,共8页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(U23A20669,52372366,U21A20126);浙江省重点研发计划项目(2024C01168)。

摘　　要：针对一双吸式离心泵内部空化流动特性及空蚀问题,开展了基于多相空化模型和空泡溃灭势能的泵内空化空蚀特性分析.基于流体体积法(VOF)和Schnerr-Sauer空化模型,并结合非定常RNG k-ε湍流模型,对双吸泵内全流场及空化流动特性开展了模拟分析.在此基础上,基于空泡溃灭势能建立空蚀风险评估方法,分析了由于泵内空化造成的空蚀风险区域.最后,基于熵产方法分析了空化造成的泵内能量损失特性及空泡产生溃灭与能量损失的关联.结果表明:该空化流动计算方法能准确模拟双吸泵扬程的变化趋势、空泡的产生过程以及空化时叶轮流道内的流动特性;空蚀风险预测结果表明:空蚀主要分布在叶轮吸力面及叶轮前盖板并位于空泡尾缘附近,且叶片表面的空蚀风险高于前盖板;泵内能量损失与空泡的产生溃灭密切相关,1个周期内能量损失极大值发生在空泡溃灭时刻.Aiming at the cavitating flow characteristics and cavitation erosion problems in a double suction centrifugal pump,the characteristics of cavitation and the cavitation erosion were investigated based on the multiphase cavitation model and cavitation bubble collapse energy.Using the Volume of Fluid(VOF)method combined with the Schnerr-Sauer cavitation model,and the unsteady RNG k-εturbulence model,the simulation of the cavitating flow field in the double suction pump was carried out.On this basis,a cavitation erosion risk assessment method was established based on the cavitation bubble collaspe energy,and the cavitation erosion risk area in the pump was predicted.Finally,based on the entropy production analysis,the energy loss characteristics in the pump caused by cavitation and the relationship between energy loss and cavitation were analyzed.The results show that the numerical model can accurately predict the pump head and its change with the cavitation,as well as the cavita-ting flow characteristics in the impeller channel.The cavitation erosion risk prediction results show that the cavitation erosion is mainly distributed in the impeller suction surface and the front cover of the impeller,which located at the cavitation tail.Moreover,the risk of cavitation erosion on the blade surface is higher than that on the front cover.The energy loss in the pump is closely related to the cavitation and the maximum energy loss in a cycle occurs when the cavitation bubble collapses.

关 键 词：双吸泵 空化 计算流体力学 空蚀 多相流 

分 类 号：S277.9[农业科学—农业水土工程]