混流式转轮内部流场的涡动力学分析  

Vorticity dynamics analysis of flow field in Francis runner

作　　者：张梁[1] 刘树红[1] 张乐福[2] 吴玉林[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]哈尔滨大电机研究所,哈尔滨150040

出　　处：《水力发电学报》2007年第6期106-110,共5页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金重点项目(No.90410019)

摘　　要：本文通过理论分析,推导了水轮机叶片所受力矩的涡动力学表达式,阐述了用涡动力学分析从全局和局部诊断水轮机内部流动的原理。用数值方法对混流式水轮机的转轮内部流场进行了计算,采用了全三维全流道的湍流计算方法,基于标准k-ε湍流模型和SIMPLEC数值方法,从导叶进口到尾水管出口,包含所有流道在内的整体一次完成计算。根据得到的流场数据,对转轮内部流场进行了涡动力学分析,得到了叶片表面的BVF分布和表面摩擦力线的分布,进行了全局和局部流场诊断,通过和用压力、速度等传统分析方法的对比,结合试验数据,验证了涡动力学分析方法的实用性。In this research, moment expression of Francis runner is derived by vorticity dynamics, the diagnose method based on vorticity dynamics is also introduced. The numerical simulation using standard k-ε turbulence model is applied to turbine flow passage with all blades （from inlet of wicket gate to outlet of draft ）. By computational results, BVF（boundary vorticity flux） and surface friction distributions on blades arre worked out, flow in Francis runner is estimated by vorticity dynamics method. Compared with the traditional analysis method and experimental data, practicability of vorticity dynamics is confirmed.

关 键 词：流体力学 涡动力学 边界涡量流 混流式转轮 

分 类 号：TK730.2[交通运输工程—轮机工程]