基于叶片载荷分布的离心泵叶轮水力性能优化  

Optimization of the hydraulic performance of a centrifugal pump impeller based on the blade load distribution

作　　者：江伟[1] 李国君[1] 张新盛[1] 

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室,陕西西安710049

出　　处：《哈尔滨工程大学学报》2015年第4期505-510,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金资助项目(51076126)

摘　　要：载荷分布是三元反问题设计中的关键参数,为分析叶片载荷分布规律对离心泵叶轮水力性能和气蚀性能的影响,采用软件CFX对叶轮a、b和c 3种不同叶片载荷方式的离心泵叶轮内流场进行数值模拟。由分析结果可知:不同叶片载荷对离心泵叶轮外特性存在较大影响,外特性性能最好的是叶轮b,但其吸力面进口处静压值最小,外特性性能其次的为叶轮a,其吸力面进口处静压值最大,所以在兼顾离心泵叶轮效率与气蚀性能的条件下,优化出最佳载荷分布方式为叶轮a,即外特性和气蚀性最好,在其最佳载荷的基础上对其载荷分布再次进行优化可知:叶轮a-3的载荷分布水力性能和气蚀性能较好。分析结果为离心泵叶轮三元反设计提供一定参考。The load distribution of a blade is the key parameter of the 3-D inverse design method.In order to analyze the influence of the load distribution of blade on the hydraulic and cavitation performance of the impeller of centrifu-gal pump, the software CFX is used to simulate internal flow field of three impellers of centrifugal pump with different blade load distributions, i.e.impeller a, impeller b and impeller c.Analysis results showed that different blade load distributions have great influence on the hydraulic and cavitation performance of the centrifugal pump.The impeller has a better external characteristic performance and the maximum static pressure at the inlet of the suction face of blade.The impeller b has the best external characteristic performance, but the static pressure at the inlet of the suc-tion face of blade is the minimum.Therefore, under the conditions of considering both the impeller efficiency and cavitation performance of the impeller of centrifugal pump, the impeller has the optimum load distribution, i.e.the external characteristic and cavitation are the best.On the basis of the optimum load, the load distribution is optimized again and the load distribution of the impeller a-3 has better hydraulic and cavitation performance.The results provid-ed a reference for 3-D inverse design of impeller in a centrifugal pump.

关 键 词：叶片载荷 叶轮 数值模拟 水力性能 气蚀性能 三元反设计 

分 类 号：TH311[机械工程—机械制造及自动化]