混流式水轮机的三维空化湍流计算  

3D cavitation turbulent flow simulation of Francis turbine

作　　者：张乐福[1] 张亮[1] 张梁[2] 吴玉林[2] 刘树红[2] 

机构地区：[1]哈尔滨工程大学,哈尔滨150040 [2]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

出　　处：《水力发电学报》2008年第1期135-138,共4页Journal of Hydroelectric Engineering

摘　　要：本文应用了三维混合流体完整空化湍流模型,对混流式水轮机内部流动进行了计算。采用了全三维全流道的湍流计算方法,采用基于RNG的k-ε湍流模型和SIMPLEC算法,从蜗壳进口到尾水管出口,包含所有流道在内的整体一次完成模拟计算。根据得到的三维空化流场数据,对转轮内部流场进行了流场分析,求得了计算临界空化系数,和试验值进行了比较;模拟了不同空化特征下的转轮出口处的空化和尾水管中的空化情况,并和试验数据进行了比较。3D mixture full cavitation turbulent model which describes the homogeneous multiphase flow is adopted to simulate 3D cavitation flow in Francis turbine. Vapour phase and water phase are considered to be at balance of dynamics and diffuseness, most of the physics processes during cavitation are considered. The whole passage of model turbine is computed by＂ RNG k-e turbulence model and SIMPLEC arithmetic. According to the simulation results, cavitating flow field is analyzed and the computational critical cavitation coefficient is obtained and compared with the experiment results. The conclusion can be drawn that this 3D mixture full cavitation turbulent model can be used to simulate the cavitation flow in Francis turbine.

关 键 词：水力机械 三维空化湍流 混合流体模型 完整空化模型 

分 类 号：TK730.2[交通运输工程—轮机工程]