双蜗壳式双吸泵隔板结构对叶轮径向力的影响  

Influence of Rib Structure in Double-volute Centrifugal Pumps on the Impeller Radial Force

作　　者：肖若富[1] 吕腾飞[1] 王福军[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：《农业机械学报》2011年第9期85-88,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(50809073);中央高校基本科研业务费专项资助项目(2009-2-12)

摘　　要：分别对单、双蜗壳式双吸泵10个工况点进行全三维流道的数值模拟和试验测试,发现由于双蜗壳式泵内部隔板设计不合理,导致双蜗壳泵较单蜗壳泵在原设计工况点的扬程、效率分别相对下降了21.8%和41.3%。依据双蜗壳设计基本原理,对隔板结构提出3种改进方案,利用雷诺时均方法(RANS)和SST k-ω湍流模型对每一方案进行全三维流道的定常数值模拟。模拟和试验结果表明:2号双蜗壳泵既保持了泵原有的水力性能,又能够有效地减小叶轮径向力,因此得到双蜗壳式双吸泵中隔板结构的最优设计模型:起始位置为隔舌绕基圆旋转180°、曲线方程为对数螺旋线、终止位置为隔板起始点旋转180°。Double-volute casings were introduced to reduce the radial force that is inherent in single-volute designs. A general three-dimensional computational fluid dynamics （CFD） simulation of a double-volute centrifugal pump was presented to predict hydraulic performance and impeller radial force. By using the shear stress transport （SST） k - to turbulent model, the simulation results in the form of characteristic curves were compared with the experimental data. The result presented that the head and efficiency of the original double-volute pump drop were 21.8% and 41.3% respectively at design point due to the failed dividing rib （splitter） in the volute casing. Thus, with the aim to analyze the effects of rib structure on pumps, three optimized rib schemes were designed to reduce the impeller radial force and keep the hydraulic performance. Three factors were considered in the rib design： start point, end point and curve equation. According to the steady numerical simulation result in each optimized scheme by CFD, No. 2 scheme reduced about half of the radial force while keeping the hydraulic performance. A method in designing the rib structure for double-volute centrifugal pumps was provided.

关 键 词：离心泵 计算流体动力学 双蜗壳 径向力 

分 类 号：TH311[机械工程—机械制造及自动化]