双吸式双蜗壳泵隔板优化设计  

Optimal design of double-volute splitter in double-suction pump

作　　者：肖若富[1] 吕腾飞[1] 王福军[1] 刘竹青[1] 

机构地区：[1]中国农业大学水利与土木工程学院,北京100083

出　　处：《排灌机械工程学报》2011年第6期477-482,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(50809073)

摘　　要：双蜗壳可减小离心泵的叶轮径向力,但数值模拟及试验结果均表明,不合理的隔板设计会导致双蜗壳泵较单蜗壳泵在原设计工况点处的扬程、效率分别相对下降21.8%和41.3%,不能满足实际工程需要.对隔板重新进行优化设计,取隔板起始位置、曲线方程中的常数、蜗壳第Ⅷ断面至隔板末端的长度3个参数为影响因素,每个因素各取两个水平,制定L4(23)标准正交试验,并对每一试验方案进行数值模拟,试验结果表明隔板起始位置(因素A)对泵的水力性能和径向力影响最为显著.由正交试验得到隔板的最优方案,并对其构成的双蜗壳泵进行内部流场分析和试验验证.结果表明:最优隔板应为隔板起始位置旋转至与蜗壳隔舌成180°对称结构、曲线方程中的常数为蜗壳基圆半径、隔板终止位置与隔舌处于同一铅直线,由此隔板构成的双蜗壳泵在保持泵原有的水力性能的同时,平均削减1/2的叶轮径向力.The double-volute was adopted to reduce the radial force that is inherent in single-volute centrifugal pumps. The hydraulic performance and radial force on the impeller in a double-volute centrifugal pump were estimated numerically based on a three-dimensional, steady and turbulent flow model. Due to the poorly designed splitter, the pump head and efficiency were relatively decreased by 21.8% and 41.3% respectively at the design point, comparing with the pump without splitter in the volute. In order to restore the performance, the splitter was optimized by approach of CFD and orthogo- hal experimental design techniques. Three factors,including starting circumferential angle and radius as well as length of free part of splitter were involved in the optimization process. The design cases were determined by the orthogonal experiment L4 （23 ） table at the two levels of those factors, subsequently, they were analyzed using a CFD code to obtain their effects on the performance of the pump. The optimum design of splitter was achieved as the result of orthogonal experiment. According to the CFD predictions and testing results of the optimized design, the radial force has been reduced by about half and the hydraulic performance has kent nearly unchanged compared with the pump without splitter in the volute.

关 键 词：双蜗壳泵 隔板 计算流体动力学 正交试验 径向力 

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