等螺距诱导轮内部流动的数值模拟  

Numerical Simulation of Inner Flow in Equal-pitch Inducer

作　　者：崔宝玲[1] 朱祖超[1,2] 林勇刚[2] 

机构地区：[1]浙江理工大学流体输送技术实验室,杭州310018 [2]浙江大学流体传动及控制国家重点实验室,杭州310027

出　　处：《机械工程学报》2010年第6期158-163,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金(20706049;50879080);浙江省重大科技攻关计划(2008C01024-1);国家重点基础研究发展计划(973计划;2009CB724300)资助项目

摘　　要：基于雷诺时均N-S方程和S-A湍流模型对等螺距诱导轮内部的流动进行三维紊流数值计算和分析,获得诱导轮流道内的速度场、压力场的分布规律。发现诱导轮最易发生汽蚀破坏的位置在叶片吸力面进口前缘的外缘处,相对速度的大小从轮毂到轮缘大致上是沿径向增加的,从轮毂到半径的中部相对速度的增加的幅度大于从半径中间到轮缘的增长幅度;静压从诱导轮进口到叶片尾部是增加的,但从叶片尾部到诱导轮的出口的部分区域静压会减少。并针对有和无诱导轮两种情况,对高速离心泵进行试验研究,通过试验验证了具有前置诱导轮的离心泵可以改善泵的汽蚀性能。所提出的诱导轮模拟方法对高速诱导轮离心泵的进一步研制和优化设计具有一定的指导意义。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.

关 键 词：诱导轮 等螺距 高速离心泵 数值模拟 汽蚀性能 

分 类 号：TH311[机械工程—机械制造及自动化]