叶轮口环间隙对农用离心泵汽蚀性能的影响  

Effect of Clearance of Impeller Wear-rings on Cavitation Characteristic of Agriculture Pump

作　　者：牟介刚[1] 苏苗印[1] 张孝风 郑水华[1] 金建波[1] 赵永攀[1] 

机构地区：[1]浙江工业大学机械工程学院,杭州310014 [2]大耐泵业有限公司,辽宁大连116022

出　　处：《农机化研究》2010年第11期25-29,共5页Journal of Agricultural Mechanization Research

基　　金：科技部重点科研项目(2009GJC20008)

摘　　要：通过对农用离心泵的汽蚀性能进行介绍,建立了离心泵汽蚀余量的理论计算方程,并分析了汽蚀余量与叶轮口环间隙大小之间的关系。在此基础上,选用RNGk-ε湍流模型,局部网格加密技术和有限体积算法对LZA50-3400离心泵在Fluent软件中进行数值模拟,探讨了在改变叶轮口环间隙大小情况下液体进口处流场的流态特征。通过流场比较分析可以看出,离心泵叶轮口环间隙越小,则过流面积越大。这有利于改善入口流态,所以汽蚀性能也就越好。最后,在试验机上对CFD模拟的结果进行试验检测,试验数据与数值模拟分析的结果基本一致,可靠的研究结论可以为农用离心泵口环结构的研究和设计提供一定的理论依据。According to the analysis of cavitation of agriculture pump,the mathematical formula of net positive suction head （NPSH） was established,and discussed the relationship between NPSH and clearance of impeller.On the basis of the RNG k-ε turbulence model,technology of compact local grids and the finite method,three dimensional numerical simulation on LZA50-3400 centrifugal pump was calculated under various clearance of the wear-rings.The results indicated that the smaller size of clearance of the wear-rings,the better flow field distribution of impeller inlet as well as the better cavitation characteristic of centrifugal pump.In the end,NPSH was tested to compare with the result of numerical simulation,the conclusion showed its reliability.

关 键 词：农用离心泵 口环间隙 汽蚀余量 数值模拟 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]