隔舌安放角对离心泵空化状态下压力脉动的影响  

Influence of diaphragm installation angle on pressure pulsation of centrifugal pump under cavitation state

作　　者：舒乙宸 宋文武 马晓堂 陈洪阳 杜聪 SHU Yi-chen;SONG Wen-wu;MA Xiao-tang;CHEN Hong-yang;DU Cong(School of Energy and Power Engineering,Xihua University,Chengdu 610039,China)

机构地区：[1]西华大学能源与动力工程学院,四川成都610039

出　　处：《机电工程》2022年第3期350-355,共6页Journal of Mechanical & Electrical Engineering

基　　金：四川省教育厅重点科研基金资助项目(18ZA0457)。

摘　　要：针对隔舌安放角对离心泵空化状态下压力脉动的影响问题,采用ANSYS CFX软件对不同隔舌安放角(28°,29.8°,32°)的离心泵进行了数值模拟,研究了隔舌安放角对离心泵空化状态下压力脉动的影响。首先,以3种不同隔舌安放角的离心泵为研究对象,利用前处理网格软件ICEM对模型泵的水体进行了网格的划分;然后,基于RNG k-ε湍流模型和Rayleigh-Plesset空化模型对不同隔舌安放角的离心泵空化过程进行了求解,通过分析离心泵的内、外特性和不同隔舌安放角模型泵隔舌处的压力脉动特征,对隔舌安放角对离心泵空化状态下压力脉动的影响进行了总结。研究结果表明:在相同有效空蚀余量下,随着隔舌安放角由28°向32°增大,离心泵的扬程和效率有所提高,压力脉动幅值有所减小;因此,适当地增大隔舌安放角能稳定隔舌在空化状态下的压力脉动,并且能有效地优化离心泵的性能。Aiming at the influence of the installation angle of the diaphragm on the pressure pulsation of the centrifugal pump under cavitation,the numerical simulation of centrifugal pump was carried out by using ANSYS CFX software with different installation angles of the diaphragm(28°,29.8°,32°),the influence of tongue angle on the pressure pulsation of centrifugal pump under cavitation condition was studied.Firstly,three centrifugal pumps with different tongue placement angles were studied and the water column of the model pump was meshed using the pre-processing meshing software ICEM,and the cavitation process of the centrifugal pump with different tongue placement angles was solved based on the RNG k-turbulence model and the Rayleigh-Plesset cavitation model.The influence of the spacer angle on the pressure pulsation of centrifugal pumps under cavitation was summarized by analyzing the internal and external characteristics of centrifugal pumps and the pressure pulsation characteristics at the spacer of model pumps with different spacer angles.The results show that with the same effective cavitation margin,as the installation angle of the separating tongue increases from 28°to 32°,the lift and efficiency are improved,and the pressure pulsation amplitude is reduced.Therefore,an appropriate increase in the spacer angle stabilizes the pressure pulsation of the spacer during cavitation and effectively optimizes the performance of the centrifugal pump.

关 键 词：离心泵 空化状态 压力脉动 隔舌安放角 

分 类 号：TH311[机械工程—机械制造及自动化]