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分流叶片对离心泵空化性能影响的数值分析
引用本文:张云蕾,袁寿其,张金凤,冯耀宁,冒杰云. 分流叶片对离心泵空化性能影响的数值分析[J]. 排灌机械工程学报, 2015, 33(10): 846-852. DOI: 10.3969/j.issn.1674-8530.14.0142
作者姓名:张云蕾  袁寿其  张金凤  冯耀宁  冒杰云
作者单位:江苏大学国家水泵及系统工程技术研究中心, 江苏 镇江 212013
摘    要:为了研究分流叶片对离心泵空化性能的影响规律,以模型泵IS50-32-160为研究对象,设计了1种不带分流叶片与3种带分流叶片不同短叶片进口直径的叶轮,利用CFD对此离心泵的全流道进行了数值模拟,并对分流叶片离心泵在不同空化余量时泵的空化性能和叶轮内部流场分布进行分析研究.分析结果表明:添置分流叶片后,泵的扬程和效率均显著提高,但短叶片的长短对扬程和效率的影响不大;添置分流叶片后,泵的抗空化性能均有提高,且当离心泵短叶片进口直径为0.725D2时,离心泵的抗空化性能相对较好,必须空化余量比其他2个带分流叶片方案减小了0.5 m;空化发生以后,叶轮出口射流速度会增加损失,同时叶轮内部速度的减小又会减少叶轮产生的动能,因而扬程会发生突降;带分流叶片的方案气泡分布情况比无分流叶片方案均有一定的改善,添置分流叶片后,气泡发展较为缓慢.

关 键 词:分流叶片  离心泵  空化  数值模拟  
收稿时间:2014-09-03

Numerical analysis of effects of splitter blades on cavitation performance in a centrifugal pump
Zhang Yunlei,Yuan Shouqi,Zhang Jinfeng,Feng Yaoning,Mao Jieyun. Numerical analysis of effects of splitter blades on cavitation performance in a centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engineering, 2015, 33(10): 846-852. DOI: 10.3969/j.issn.1674-8530.14.0142
Authors:Zhang Yunlei  Yuan Shouqi  Zhang Jinfeng  Feng Yaoning  Mao Jieyun
Affiliation:National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract:The pump cavitation performance will be influenced by the additional splitter blades because the shape of the impeller inlet channel is changed. In order to investigate the influences, four impeller schemes were presented based on a model pump IS50-32-160, one without splitter blades and another three with splitter blades of different inlet diameters. By using the CFD technique, numerical simulations were carried out to investigate the characteristics of internal flow and the pump cavitation performances at different NPSHA. The results show that the cavitation performance of pump is improved by the additional splitter blades, and that the proper selection of the inlet diameter of splitter blades contribute to the degree of improvements of the cavitation performance of pump, which even could avoid the blocking at the impeller inlet and vortex cavitation inside the water passage effectively, and that the cavitation performance reaches its best when the inlet diameter of splitter blades is 0.725D2 for the pump model under our investigation.
Keywords:splitter blade  centrifugal pump  cavitation  numerical simulation  
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