弯肘形尾水管三维粘性流动计算与分析

Calculation and Analysis on Three-dimentional Viscous.Flow in the Elbow Draft Tube

一种数值模拟三维粘性流动的计算机软件ＰＨＯＥＮＩＣＳ被应用于预测弯时形尾水管的流动特性．这种数值模拟方法是基于时间平均的奈维－斯托克斯方程，并采用二方程的ｋ－ε素流模型作为方程的闭合条件．本文讨论了数值模拟中各种参数的设定原则和方法．最后分析了尾水管进口水流无环量和有环量两种情况的计算结果，特别着重分析了肘管内的水流运动情况．

A computer software package PHOENICS which is for simulation threedimentional viscous fluid-flow is successfully applied to predicting flow behavior in the elbowdraft tube. This numerical simulation method is based on sloving Reynolds averaged Navierstokes equations and a two-equation turbulent model is used as the closing condition of thisequation. This paper also discusses how to set the fluid flow parameters during the preprocessing of PHOENICS and analyze the calculation results of two cases which include theinlet uniform and inlet swiring flows. Finally, attention is especially paid to flow behavior inthe elbow.