摘要
本文采用以压力为求解变量的原始变量法，对雷诺平均后的不可压缩Ｎ－Ｓ方程，用有限差分法离散，并用压力一速度校正法求解。混流式水轮机转轮内部的流动是流体力学中最复杂的流动之一。对Ｎ—Ｓ方程中的雷诺应力项，本文采用了目前工程中适用的标准ｋ－ε模型，在固壁附近粘性支层中的流动，采用壁面函数法。本文计算了Ｔａｙｌｏｒ弯管内的粘性流动，并与测试结果进行了比较分析，进而计算了一低比转速混流式水轮机转轮的三个工况点，与该转轮外特性的试验结果进行了比较。并对天生桥皿级电站５、６号机组进行了粘性分析设计。
In this paper, according to the rule of Reynolds-averaged, the coned equation for incompressibleflow be obtained. The numerical procedure is a pressure correction of finite differential formulation on gener-al curvilinear coordinate system based on pressure as solving variable. Flows in runner of Francis tulbine isone of the most complex flow on fluid mechanics. Standald k - turbulence turbrlence is applied to estimate theReynolds stress of Reynolds averaged Navier - Stokes equation, and the wall function is adopted for laminar sublayer near the sulface of the solid wall.Viscous flow in Taylor curved duct is calculated and comparedwith measuring xesult. And then the flow fields in a type of runner at three operating points are calculated,and it is applied to Tian Shengqiao No5.6 units.
出处
《大电机技术》
北大核心
1999年第4期44-49,共6页
Large Electric Machine and Hydraulic Turbine
