混流式水轮机转轮紊流流场的计算机仿真  

Computer simulation of turbulent flow through a Francis hydraulic turbine runner

作　　者：胡英[1] 程赫明[2] 王定祥[1] 

机构地区：[1]昆明理工大学机电工程学院,云南昆明650093 [2]昆明理工大学建筑工程学院,云南昆明650093

出　　处：《武汉大学学报（工学版）》2008年第1期104-107,共4页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:90510018);云南省教育厅科学研究基金项目(编号:5Y0020A)

摘　　要：基于雷诺时均N-S方程和Realizablek-ε紊流模型,采用有限体积法,在拼片式块结构化网格上建立离散方程,选择二阶中心差分及二阶迎风差分格式作为空间离散格式,采用全隐式时间积分方案进行时间域离散.用全隐式多网格耦合技术求解离散方程.用CFX-TASCflow流体流动分析软件,对一个混流式模型转轮进行了三维非定常紊流计算,数值模拟了转轮内部三维紊流流场,得出了设计工况下的三维流场分布.应用计算机仿真技术对转轮进行流态分析,可以减少模型试验的次数,提高转轮的性能,从而缩短设计周期,降低成本.Based on the Navier-Stokes equations and the realizable k-ε turbulent flow model, the discretization is carried out by the finite element method based FVM on a patched block-structured grid system. A second-order central difference scheme and a second-order upstream difference scheme are used for discretization. The discretization of time is carried out by a full implicit time integral scheme. The discretization equations are formulated by a full implicit coupled multigrid method. CFX-TASCflow software are used to calculate the 3D unsteady turbulent flow in a model Francis hydraulic turbine runner and to simulate the 3D turbulent flow field in it. The results at the design operating condition are presented. It may reduce numbers of test and increase the performance to analyze the flow state in a runner by the computer simulation. Thus, the time and design cost needed for a new one can be shortened dramatically.

关 键 词：水轮机转轮 非定常紊流 计算机仿真 

分 类 号：TK730.316[交通运输工程—轮机工程]