蜗壳隔舌半径对离心泵性能及水力载荷特性的影响  

Effects of tongue tip radius on performance and hydrodynamic load characteristics in centrifugal pump

作　　者：高波[1] 杨丽[1] 张宁[1] 杜文强[1] 袁霄 GAO Bo;YANG Li;ZHANG Ning;DU Wenqiang;YUAN Xiao(School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China;Jiangsu Zhenhua Pump Industry Co. Ltd., Taizhou, Jiangsu 225500, China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013 [2]江苏振华泵业股份有限公司,江苏泰州225500

出　　处：《排灌机械工程学报》2018年第3期185-190,203,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51576090);江苏高校优势学科建设工程项目

摘　　要：为研究蜗壳隔舌半径对离心泵性能及水力载荷特性的影响,针对同一叶轮匹配5种不同隔舌半径的离心泵进行非定常数值计算.通过计算获得了不同泵的水力性能、压力脉动特征、叶片载荷及叶轮上的径向力分布,并且与试验结果进行对比分析,验证了采用的数值计算方法具有较高的正确性.研究结果表明:隔舌半径对扬程的影响较小,随隔舌半径的增大,各工况下效率呈先增大后减小的趋势;当隔舌与基圆半径之比TR取值为0.09~0.24时,叶片工作面与背面的载荷差值有最小值,即此时叶片受力沿进口至出口的变化最小;随着隔舌半径的增大,泵内的压力脉动水平逐渐降低,TR=0.03时,叶频处的压力脉动幅值约为TR=0.30时的2倍;隔舌半径对叶轮径向力的大小影响显著,在设计工况下,径向力随隔舌半径的增大而增大,且TR=0.3时的径向力约为TR=0.03时的2.5倍.In order to investigate effects of volute tongue tip radius on performance and hydraulic load characteristics,unsteady flow fields in a centrifugal pump with the same impeller but different volutes in five tongue tip radii were simulated numerically.The hydraulic performance,pressure pulsation,blade loading and radial thrust on the impeller were acquired and analysed,and the predicted performance was compared with the experiment results,showing the numerical methods adopted in the paper were in a better accuracy.The results show that the tip radius has a little effect on the hydraulic performance,but the best hydraulic efficiency can be achieved at a certain tip radius.When the dimensionless tip radius TR（tip radius-to-base circle radius ratio） is in a range of 0.09-0.24,the loading across the blade pressure side and suction side is the minimum,i.e.the force acting on a blade exhi-bits the least variation from the leading to trailing edges.With increasing TR,the pressure fluctuation level in the pump reduces gradually,particularly the pressure amplitude at TR = 0.03 is about 2 times the amplitude at TR = 0.30 for blade passing frequency.The tip radius has a significant effect on impeller radial thrust.At the nominal flow rate,the radial thrust increases with increasing tip radius,and at TR = 0.30 the thrust is about 2.5 times the thrust at TR = 0.03.

关 键 词：离心泵 隔舌半径 叶片载荷 径向力 数值模拟 

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