基于流固耦合的斜流泵空间导叶多工况强度分析

Strength Analysis on Space Diffuser of Mixed Flow Pump based on the Fluid-structure Interaction Method with Many Working Conditions

空间导叶作为斜流泵的主要过流部件,对改善叶轮出口流场具有重要的意义,探究其内部流动以及与固体之间的相互作用尤为必要。通过对0.6Q_d、0.8Q_d、1.0Q_d、1.2Q_d和1.4Q_d5个不同流量工况点进行CFD仿真及流固耦合计算分析,结果显示空间导叶承受的总压随着流量的增加逐渐减小,空间导叶与上下盖板连接位置承受压力较大;随着流量的增加,空间导叶最大应力值和变形量均减小,其所承受应力主要集中于上盖板进口边以及导叶与上下盖板连接处,在上盖板两导叶叶片中间位置变形较为明显。研究结果可为斜流泵空间导叶结构设计和强度优化提供参考。

As the main flow component of the mixed-flow pump,space diffuser plays a significant role in improving the flow field of impeller outlet,so it is necessary to study and analyze its flow field and interaction with structure. Through CFD stimulation,the fluid-structure interaction analysis was performed for five different flow conditions including0. 6Q_d,0. 8Q_d,1. 0Q_d,1. 2Q_d,and 1. 4Q_d. It was concluded that the maximum total pressure of space diffuser gradually decreases while its flow rate increases,and the pressure at the connection position between the space diffuser and the upper and lower covers is large. Both the maximum stress of space diffuser and the maximum deformation decrease as its flow rate increases. The main stress of space diffuser is focused on the connection of upper and lower cover-plates and the inlet edge of the upper cover-plate. And it is evident that the position deformation takes place between two diffuser blades of the upper cover-plate. This study is believed to provide reference to further study onthe impeller structure design and strength optimization for mixed-flow diffuser.