基于熵产的旋流泵流动损失特性分析  

Analysis of flow loss characteristic of vortex pump based on entropy production

作　　者：赵凯尧 刘厚林[1] 杜振明 谈明高[1] 胡胜 董亮[1] ZHAO Kaiyao;LIU Houlin;DU Zhenming;TAN Minggao;HU Sheng;DONG Liang(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Dalian Leo Huaneng Pump Co.,Ltd.,Dalian,Liaoning 116049,China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013 [2]大连利欧华能泵业有限公司,辽宁大连116049

出　　处：《排灌机械工程学报》2021年第12期1284-1290,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51979124);国家重点研发计划项目(2019YFC0312404,2019YFC0312401)。

摘　　要：为揭示旋流泵运行过程中的能量损失特性,通过数值模拟的方法分别对60%,100%和120%设计流量工况下旋流泵的内部流场进行分析和研究,同时基于熵产理论对旋流泵各个过流部件的流动损失进行定量分析.结果表明:旋流泵在运行过程中总熵产先减小后增大,其中能量损失最大的区域是无叶腔和后腔部分,约占总熵产的70%以上.叶轮区域的熵产随着流量增加逐渐增大,设计流量、大流量工况下叶轮区域的熵产占总熵产的比例超过20%.进口延长段区域的熵产随流量增加逐渐减小,设计流量、大流量工况下熵产占比低于1%.流场分析显示,在小流量工况下,蜗壳隔舌前端和进口流道有明显的大尺度涡团和回流.设计流量、大流量工况下流动不稳定区域主要集中在叶轮区域,该区域涡核几乎充满所有流道,且有大量旋涡产生造成流道阻塞和回流.研究结果能够为旋流泵的优化设计提供一定的参考.To research the flow energy loss during the operation of the vortex pump, the numerical si-mulations under 60%, 100% and 120% best efficiency point flow rate conditions were developed. At the same time, the flow loss of different components inside of the pump was quantitatively analyzed based on entropy production theory. The results show that the total entropy production of the vortex pump decreases first and then increases during the operation. The area with the greatest energy loss is the volute and the back cavity, which accounts for more than 70% of the total entropy production. Entropy production of impeller area gradually increases with the increase of flow rate. Under the design flow condition, the proportion of the impeller area′s entropy production to the total entropy production exceeds 20%. The entropy production in the inlet extension region decreases with the increase of flow rate, and the proportion of entropy production is less than 1% at the design flow rate and the high flow rate. Flow field analysis shows that large-scale vortices and backflow are obvious in front of volute tongue and inlet flow passage under small flow conditions. The unstable flow area under design flow and large flow conditions is mainly concentrated in the impeller area, the vortex core is almost filled with all flow paths, and a large number of vortices cause flow paths blockage and backflow.The research provides a theoretical basis for the optimum design of vortex pump.

关 键 词：旋流泵 流动损失 旋涡 熵产 数值模拟 

分 类 号：TH313[机械工程—机械制造及自动化]