蜗壳基圆对离心泵性能的影响  

Relationship between Cutwater Diameter and Performance of Centrifugal Pump

作　　者：王洋[1] 刘静[1] 王维军[1] 张文静[1] 李敏敏[1] 

机构地区：[1]江苏大学流体机械研究中心,江苏镇江212013

出　　处：《农机化研究》2012年第6期184-188,共5页Journal of Agricultural Mechanization Research

基　　金：国家"863计划"项目(2007AA05Z207);江苏省高等学校优秀科技创新团队计划项目(苏教科[2009]10号)

摘　　要：通过联立蜗壳的两个不同形式特性方程,得出了基圆直径的计算公式,建立了基圆直径和蜗壳喉部面积及叶轮外径之间的关系。为了验证公式的准确性,在保证蜗壳其他主要几何参数不改变的前提下,取基圆直径分别为叶轮外径1.05,1.10,1.15,1.20倍的不同的蜗壳与同一叶轮匹配,数值模拟和试验分析了蜗壳基圆和泵性能的关系。结果表明:在一定范围内,随着基圆的增大,流量扬程曲线有明显的变化,符合公式给出的变化趋势,且较大基圆对流量扬程曲线的驼峰有显著的改善;但是超过一定范围后,由于蜗壳和叶轮之间间隙的二次流增加,致使泵性能明显下降。Through the simultaneous equations of two different forms of volute performance,it was concluded that the calculation formula of cutwater diameter,the relationships between cutwater and volute areas as well as impeller outside diameter were established.In order to verify the accuracy of the formula,based on ensuring that the other major geometric parameters of volute was unchanged,the impeller was matched with different volute including respectively 1.05,1.10, 1.15 and 1.20times impeller outside diameter.Through numerical simulation and experiments,the relationship between the cutwater diameter and the performance of pump was analyzed.The results shows that in a certain changing range with cutwater diameter,the H-Q curve have apparently changed,which is consistent with the variation tendency of formula,and bigger cutwater diameter improve the hump of H-Q curve significantly.Yet beyond a certain range,the performance of pump is degraded obviously due to the increase of secondary flow between the clearance of impeller and volute

关 键 词：离心泵 蜗壳基圆 数值模拟 蜗壳喉部面积 

分 类 号：TH311[机械工程—机械制造及自动化]