叶片包角对混流泵作透平的特性影响  

Influence of blade wrap angle on characteristics of mixed flow pump as turbine

作　　者：杨孙圣[1] 邵珂 戴韬 YANG Sunsheng;SHAO Ke;DAI Tao(National Research Center of Pumps, Jiangsu University, Zhenjiang, Jangsu 212013, 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

出　　处：《排灌机械工程学报》2019年第6期475-479,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(11602097);江苏高校优势学科建设工程项目

摘　　要：采用数值模拟与试验验证相结合的方法,在保证叶轮其他主要几何参数不变的情况下,分别模拟叶片包角为45°,65°,75°,85°,95°和105°的叶轮模型,并通过试验进行验证,探究叶片包角变化对混流泵作透平性能的影响规律.结果表明:随着叶片包角增大,混流泵作透平流量效率曲线向小流量工况偏移,且高效区间逐渐减小,流量扬程曲线和流量轴功率曲线上升趋势越来越陡峭.随着包角增加,液流流动将更加贴近叶片型线,叶轮流道内部旋涡现象得到一定程度的改善.包角增加使得叶片对液流约束能力加强,旋涡损失减小从而小流量区域水力损失减小;在大流量区域,包角增大使得叶轮流道加长,摩擦损失增加从而流道内的水力损失加大.因此旋涡损失和摩擦损失的共同作用使叶片包角存在一个最佳值使得透平最高,效率最高,对混流泵作透平叶片设计有一定的指导意义.Numerical simulation was adoped and the blade wrap angles were 45°, 65°,75°,85°,95° and 105° when impellers′ other geometric parameters remained the same. The influence of blade wrap angles on PATs was studied. The results show that with the increase of the blade wrap angles, the li-quid flow is closer to the blade profile. The vortex in the impeller channel inside is improved. The turbine′s high-efficiency curves shift toward the small flow rate area, the high efficiency region becomes smaller and the head curve and shaft power curve are getting steeper. The blade′s constraint on the flow is enhanced with the increase of blade wrap angles, the hydraulic loss in the small flow area is reduced, but the runner is lengthened, the friction loss is increased. With the augment of the blade wrap angles, the hydraulic loss increases in the mass flow area indicating that there is a best blade wrap angles. This result can provide some guidance to the design of the mixed-flow pump as turbines.

关 键 词：混流泵作透平 叶片包角 水力损失 数值模拟 

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