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

作　　者：王家斌 陈佳[2] 袁寿其[2] 裴吉[2] 孟凡[2] 

机构地区：[1]山东双轮股份有限公司,山东威海520000 [2]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013

出　　处：《排灌机械工程学报》2016年第4期283-289,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：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(1401069B)

摘　　要：为了研究双吸泵双蜗壳隔舌区的压力脉动特性,采用CFD方法对某一型号双吸双蜗壳离心泵进行不同工况下全流场非定常数值模拟,得到了泵内部流动特性及隔舌区监测点的压力脉动情况,并对其进行压力脉动强度分析和时域、频域分析.计算结果表明:压力脉动强度大的区域主要分布在叶轮出口与隔舌的交界面处,说明叶轮与隔舌的动静干涉作用将引起隔舌处较大的压力脉动;2个隔舌在额定流量下的脉动强度均小于偏离额定工况下的脉动强度,且随着流量的增大,隔舌A处压力脉动强度的分布逐渐变得对称;在额定工况下,2个隔舌区的压力脉动周期性明显,在隔舌A处中间平面上压力脉动频率以2倍轴频为主,两侧以1倍叶频为主;隔舌B处中间平面与其中一侧的压力脉动频率以2倍叶频为主,另一侧则以1倍叶频为主;在1.0Qd和1.2Qd工况下,隔舌A的中间平面上P0的压力脉动频率均以2倍叶频为主,小流量下则以1倍叶频为主,但其幅值变化并不明显,而隔舌B处中间平面上的压力脉动幅值受流量变化影响较大,0.8Qd倍和1.2Qd工况下压力脉动幅值明显增大.To study the pressure fluctuation near double volute tongue nf a large flow rate douhle-suc- tion centrifugal pump, the three-dimensional unsteady turhulent flow was numerieally simulated with CFD software under different operational conditions. The characteristics of flow field and pressure flue- tuation of the monitoring points near w）lute 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 tlucluation intensity areas are mainly located between impeller outlet and w）lute Iongue, which shows that the interaction of impeller and tongue will cause strong pressure fluctuation near volute tongue. Fluctuation intensity under 1. OQd 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 frequeney 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 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]