离心泵叶轮进口空化形态的试验测量  

Experimental Measurement on Cavitation Pattern at Impeller Inlet of Centrifugal Pump

作　　者：王勇[1] 刘厚林[1] 王健[1] 吴贤芳[1] 刘东喜[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,镇江212013

出　　处：《农业机械学报》2013年第7期45-49,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(51239005;51079062;51179075);'十二五'国家科技支撑计划资助项目(2011BAF14B03);江苏高校优势学科建设工程项目;江苏省博士后科研资助项目(1202076C);江苏大学高级人才基金资助项目(12JDG044)

摘　　要：为研究离心泵叶轮进口部分的空化形态,以一台中等比转数离心泵为对象,在泵进口管路上增加全透明水箱,基于泵产品智能测试系统和图像采集系统,在离心泵闭式试验台上对3种不同流量下叶轮进口的空化形态进行可视化试验研究。试验结果表明:空泡首先在模型泵叶片背面进口边附近初生,空泡的产生位置因运行工况不同而变化;随着装置空化余量NPSHa的下降,多个叶片背面有空泡产生,并随着叶轮的转动,呈现明显的初生、生长和溃灭的动态过程;当泵扬程下降较大时,空泡的分布随叶轮转动变化不大,且靠后盖板一侧的空泡分布小于靠前盖板一侧。speed cen In order to study the cavitation pattern at impeller inlet of centrifugal pump, a medium specific trifugal pump was selected as an object, and a total transparent water tank was located at inlet pipeline of model pump. Based on pump product testing system and image acquisition system, the cavitation pattern at impeller inlet under three different conditions were measured on the centrifugal pump closed experimental rig. Experimental results showed that the vapors generated at suction side of blade near the leading edge at first, but the location varied with the operation condition. With the decrease of NPSHa, the vapors generated at plurality of blades. The generation, development and collapse process obviously appeared with the rotation of impeller. When the head dropped seriously, the distribution of the vapors hardly varied with the rotation of impeller, and the vapor volume fraction near impeller hub was less than that at shroud side.

关 键 词：离心泵 空化 叶轮进口 

分 类 号：TH311[机械工程—机械制造及自动化]