排灌机械工程学报2016，Vol.34Issue(4)：283-289,7.DOI:10.3969/j.issn.1674-8530.15.0134
双吸双蜗壳离心泵隔舌处的压力脉动特性
Pressure fluctuation near double volute tongue for double-suction centrifugal pump
摘要
Abstract
To study the pressure fluctuation near double volute tongue of a large flow rate double-suc-tion centrifugal pump,the three-dimensional unsteady turbulent flow was numerically simulated with CFD software under different operational conditions.The characteristics of flow field and pressure fluc-tuation of the monitoring points near volute tongue were obtained,and pressure fluctuation intensity as well as the time and frequency spectra were analyzed respectively.The results show that the high-pres-sure fluctuation intensity areas are mainly located between impeller outlet and volute tongue,which shows that the interaction of impeller and tongue will cause strong pressure fluctuation near volute tongue.Fluctuation intensity under 1.0Qd flow rate near both volute tongues is lower than that under large and small flow rates,and the distribution of pressure fluctuation intensity near A tongue becomes uniform gradually with the increasing of flow rate.Under 1.0Qd flow rate examined,in A tongue width direction,the double rotating frequency dominates the pressure fluctuation on middle position while other two sides are only one blade passing frequency;the dominant frequency on middle position and one side in B tongue width direction is double blade passing frequency while the other side is only one blade passing frequency.Under 1.0 Qd and 1.2Qd flow rate,the dominant frequency is double blade passing frequency at point P0 on middle position in A tongue width direction while it is only one blade passing frequency under 0.8Qd ,and unapparent change of amplitude can be found for any flow rates in A tongue width direction,however,the pressure fluctuation amplitude on the same position near B tongue increases significantly under the conditions of 0.8Qd and 1.2Qd flow rate.关键词
双吸泵/双蜗壳/隔舌/压力脉动/压力脉动强度Key words
double-suction centrifugal pump/double volute/tongue/pressure fluctuation/pressure fluctuation intensity分类
农业科技引用本文复制引用
王家斌,陈佳,袁寿其,裴吉,孟凡..双吸双蜗壳离心泵隔舌处的压力脉动特性[J].排灌机械工程学报,2016,34(4):283-289,7.基金项目
江苏高校优势学科建设工程项目；国家自然科学基金资助项目（51409123）；江苏省博士后科学基金资助项目 （）
