排灌机械工程学报
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排灌机械工程学报  2016, Vol. 34 Issue (5): 375-380    DOI: 10.3969/j.issn.1674-8530.14.1017
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低比转数离心泵内部流动特性和外特性试验
崔宝玲, 方晨, 葛明亚
浙江理工大学浙江省流体传输技术研究重点实验室, 浙江 杭州 310018
Internal flow characteristics and performance test of two low specific-speed centrifugal pumps
CUI Baoling, FANG Chen, GE Mingya
Province Key Laboratory of Fluid Transmission Technology, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
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摘要 为研究分流叶片对低比转数离心泵内部流动和性能的影响,在原型泵叶轮(具有4长4短叶片)基础上,设计了8长叶片的叶轮模型.基于雷诺时均Navier-Stokes方程和Spalart-Allmaras湍流模型对各模型泵内的流场进行三维定常数值模拟计算,得到了泵内部流动特性.同时对原型泵进行外特性试验,并将计算结果与试验结果进行对比验证.数值计算结果表明:离心泵蜗壳内的周向速度大于径向速度,流体呈周向流动;径向速度随着周向角度的增大缓缓变大;8长叶片的叶轮相对于4长4短叶片叶轮在设计流量工况下具有更高的扬程和效率,8长叶片的叶轮比4长4短叶轮具有更好的水力性能;8长叶轮的叶片进口处具有更大的相对低压区;叶轮内部都存在旋涡,相对于4长4短叶片的叶轮,8长叶片的叶轮具有更大的涡.试验结果验证了数值计算的正确性.
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崔宝玲
方晨
葛明亚
关键词离心泵   分流叶片   数值模拟   外特性试验     
Abstract: To investigate into the influence of blade length on internal flow and performance of a low specific speed centrifugal pump, an impeller with 8 full-length blades is designed by updating a refere-nce impeller which has 4 full-length blades plus 4 splitters. The flow field in the pumps is calculated based on the time-averaged Navier-Stokes equation and the Spalart-Allmaras turbulence model, then the internal flow characteristics are obtained. At the same time, the pump performance is tested to validate the performance predicted. It is found that the circumferential velocity is greater than the radial velocity in the volute, and the latter increases slowly with increasing circumferential angle. At the design point, both the head and the efficiency of the impeller with 8 full-length blades are higher than those of the impeller with 4 full-length blades and 4 splitters. The numerical results show that the low pressure area at the inlet of the impeller with 8 full-length blades is larger than that of the impeller with splatters. There exist vortexes in the flow passages of both impellers, and the area covered by the vortexes in the impeller with 8 full-length blades is larger than that in the impeller with splitters. Experimental results have verified the correctness of the numerical computation.
Key wordscentrifugal pump   splitter blade   numerical simulation   external characteristics   
收稿日期: 2014-12-25;
基金资助:国家自然科学基金资助项目(51536008)作者简介:崔宝玲(1975—),女,河北唐山人,副教授(blcui@zstueducn),主要从事流体机械及工程研究方晨(1988—),男,浙江金华人,硕士研究生(fxf432@163com),主要从事流体机械内部流动及优化研究
通讯作者: 方晨(1988—),男,浙江金华人,硕士研究生(fxf432@163.com),主要从事流体机械内部流动及优化研究.   
作者简介: 崔宝玲(1975—),女,河北唐山人,副教授(blcui@zstu.edu.cn),主要从事流体机械及工程研究.
引用本文:   
崔宝玲,方晨,葛明亚. 低比转数离心泵内部流动特性和外特性试验[J]. 排灌机械工程学报, 2016, 34(5): 375-380.
CUI Bao-Ling,FANG Chen,GE Ming-Ya. Internal flow characteristics and performance test of two low specific-speed centrifugal pumps[J]. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(5): 375-380.
 
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