混流式水轮机涡带工况下两级动静干涉及其压力脉动传播特性分析

Analysis on characteristics of two-stage rotor-stator interaction and pressure fluctuation propagation in Francis turbine under partial load

本文以某混流式模型水轮机为研究对象,选取一种小流量工况点开展了全三维非定常湍流的数值模拟。研究中,采用全流道建模和滑移网格技术模拟转轮与活动导叶、转轮与尾水管之间的动静干涉作用;详细分析了过流部件内典型位置处的压力脉动特性,并与模型试验的结果进行了比较;探讨了部分负荷工况下,流场中涡带演化过程及两种频率分量的压力脉动沿转轮传播与衰减的规律。

This paper presents whole passage numerical simulations of unsteady three-dimensional turbulent flow in a model Francis turbine operated in partial load condition, focusing on analysis of the interactions of two rotor-stator stages, guide-vane and runner, runner and draft-tube. A sliding mesh technique was adopted to model the interactions. A comparison with experimental results and a detailed examination on calculated pressure fluctuations at typical locations reveal vortex rope evolution and pressure pulsation propagation along the runner under the partial load.