低比转数离心泵叶轮内流动分离的PIV实验研究  

PIV Measurement of Flow Separation in a Low-specific Centrifugal Pump Impeller

作　　者：邱勇[1] 季燕羽 杨洪镔[3] 唐晓晨[1] 谈明高[2] 

机构地区：[1]江苏振华泵业制造有限公司,江苏姜堰225500 [2]江苏大学流体机械工程技术研究中心,江苏镇江212013 [3]永州职业技术学院,湖南永州425100

出　　处：《中国农村水利水电》2016年第10期182-185,共4页China Rural Water and Hydropower

基　　金：国家自然科学基金(51209105;51509109);江苏省科技支撑项目(BE2014879)

摘　　要：针对离心泵叶轮内流动分离的现象,采用粒子图像测速技术(PIV)对一台低比转数离心泵进行了测试。分析了在叶轮的设计工况Q/Q_(BEP)=0.18下,不同相位时,不同流道内流动分离产生的分离泡变化情况。结果表明:由于蜗壳周向的压力不平衡,分离泡随叶轮旋转周期性地产生、发展和溃灭。由于流道进口相互作用的影响,流动分离和分离泡的周期性变化与流道出口压力的周期性变化不一致。分离泡在叶片压力面中部产生,而在叶片压力面出口附近溃灭。在分离泡形成初期,分离泡的滞止点运动轨迹近似呈线性;在分离泡发展稳定后直到溃灭前,滞止点运动轨迹近似呈圆弧状。The flow in a low-specific centrifugal pump is measured by PIV technique, focusing on the flow separation of the cenmtugal pump impeller. The separation bubble induced by flow separation in different channels is studied and analyzed in different phases, operating at flow rate Q/Qpep =0. 18. The results show that the separation bubble generates, develops and collapses periodically with the impeller rotation, because the circumferential pressure distribution of the volute is unbalanced. However, the periodical change of the flow separation and subsequent separation bubble is inconformity with the outlet pressure of the channel. The separa- tion bubble generates on the middle part of the pressure side of the blade, and collapses near the outlet of the blade pressure side. The movement trail of the stagnation point is approximately linear, at the beginning of the separation bubble formation. From the de- velopments to the collapse of the separation bubble, the movement trail of the stagnation point is approximately arc-shaped.

关 键 词：低比转数离心泵 粒子图像测速技术 流动分离 分离泡 滞止点 

分 类 号：S277.92[农业科学—农业水土工程] TV93[农业科学—农业工程]