关键词: 等螺距, 高速离心泵, 汽蚀性能, 数值模拟, 诱导轮, 结构设计, 四自由度, 特性分析与测试, 压电微夹钳

Abstract: Based on the Navier-Stokes equations and the Spalart-Allmaras turbulence model, three dimension turbulent flow fields in equal-pitch inducer are calculated and analyzed numerically. The relative velocity and pressure distributions in it at design point are obtained. It is found that the location most easy to happen cavitation is on the outer edge of inlet edge of vane suction surface, the relative velocity rises by and large from hub to rim along radial direction, but the increase rate from hub to radius middle part is greater than that from radius middle part to rim. Static pressure rises from inducer inlet to vane trail but it decreases at part area from vane trail to inducer outlet. Experimental studies are carried out on high-speed centrifugal pumps with and without inducer. The results show that the centrifugal pump with preposed inducer can improve the cavitation performance of pump. The proposed numerical simulation method has certain directive significance to further development and optimal design of high-speed inducer centrifugal pumps.

Key words: Equal pitch, High-speed centrifugal pump, Inducer, Numerical simulation, Suction performance, 4-DOF, analysis and test of performance, structure design, piezoelectric micro-gripper