离心泵锥形吸水室内置隔板对水力性能的影响  

Influence on Hydraulic Performance of Suction Chamber with Built-in Baffles in Centrifugal Pump

作　　者：牟介刚[1] 李思[1] 许明远 赵永攀[1] 金建波[1] 

机构地区：[1]浙江工业大学机械工程学院,杭州310014 [2]中国镍业有限公司供应部,北京100029

出　　处：《农业机械学报》2011年第3期80-84,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家科技人员服务企业行动项目(2009GJC20008)

摘　　要：分析了离心泵锥形吸水室内部预旋及回流的产生原因,并指出在吸水室内置隔板优化内部流动状态的传统做法可行。采用CFD数值模拟与试验研究相结合的方法,分析了吸水室内置隔板对单级离心泵性能的影响。通过改变隔板的径向长度、轴向长度、安放位置以及数量,得出吸水室内流状态及泵性能随隔板参数值的变化趋势,确定出隔板最佳的相关参数值为:隔板数量n=2,径向长度a=D0/4,轴向长度b=3L/4,在靠近叶轮入口端安放;并设计内置相应隔板的锥形吸水室,制造典型样机进行试验测试,结果表明:改进隔板设计参数后的离心泵水力模型在设计工况点,扬程提高0.8 m,效率提高1.7个百分点,消除了性能曲线驼峰。The cause for the generation of prerotation and recirculation in the suction chamber was analyzed and the two-sided effect of prerotation on the hydraulic performance in centrifugal pump was pointed out.The effective solution was baffles built in suction chamber.With different physical parameters and placement of the baffles in suction chamber,CFD numerical simulation was applied to predict the performance variation trend of centrifugal pump.According to the performance curve and the flow state in the chamber,the optimum baffle came out： the radial length is D0 /4（inlet diameter）,and the 3/4 length of chamber is the value of axial length for the baffle.And,two baffles should be put closed by the impeller.The prototype was designed for hydraulic modeling test.The result indicated that the performance of the new model is superior to the original one.The values of head and efficiency rose by 0.8m and 1.7% at the design condition,relatively.Fluent numerical simulation with high accuracy could be applied in structural optimal design of centrifugal pump.

关 键 词：离心泵 锥形吸水室 预旋 回流 隔板结构 水力性能 

分 类 号：TH311[机械工程—机械制造及自动化]