低比转数变工况离心泵的性能优化  

Performance optimization of low-specific speed centrifugal pump under variable operation conditions

作　　者：卜学兵 陈晖[1] 李永鹏[1] 王文廷[1] 

机构地区：[1]西安航天动力研究所,陕西西安710100

出　　处：《排灌机械工程学报》2015年第3期203-208,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：中国航天科技集团公司科研支撑项目(2011TY09)

摘　　要：为了提高低比转数变工况离心泵的全局效率,采用单独离心叶轮优化、单独蜗壳优化和叶轮与蜗壳整体优化3种设计方案,基于拉丁超立方抽样试验和模拟退火优化算法,利用数值模拟方法对流量比(最大流量/最小流量)为8的离心泵进行性能优化.研究结果表明:3种优化方案都能提高变工况离心泵的全局效率,其中蜗壳优化和整体优化获得的泵效率比较接近,而叶片优化方案的效果相对较弱,故开展低比转数变工况离心泵优化时,可以优先考虑对蜗壳结构参数进行优化设计;进行变工况离心泵水力设计时,为了提高离心泵整体效率,应使选取的设计流量稍微小于最大工作流量.In order to improve the overall efficiency of a low-specific speed centrifugal pump at multioperation point, the hydraulic performance of such a pump is optimized numerically across a flow rate ratio of 8 （ the maximum flow rate to the minimum one） by making use of a global optimization algorithm based on Latin hypercube sampling and simulated annealing algorithm. Three optimization schemes are exploited, i.e. impeller optimization, volute optimization, and overall （impeller plus volute ） optimization. It is shown that the efficiency of the optimized pumps becomes better in all the optimization schemes. The efficiency of the optimized pump in the volute optimization scheme is quit close to that in the overall optimization. However, the improvement of efficiency in the impeller optimization scheme is less than that in the other schemes. Thus, when a centrifugal pump with low-specific speed is optimized at variable operation points, the first priority is to conduct a volute optimization. Moreover, in order to improve the overall efficiency of a centrifugal pump at multi-operation point, the design flow rate should be slightly lower than the maximum operation flow rate.

关 键 词：离心泵 低比转数 变工况 性能优化 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]