用粘性体积力方法计算高速离心压气机叶轮内部流场

高速离心压气机是用途非常广泛的一种动力机械,充分了解其内部复杂的三维流场对设计高压比、高效率离心压气机具有很重大的意义。本文采用一种简化的Navier-Stokes方程的计算方法-粘性体积力方法,计算了Krain叶轮内部流场。使用H型网格离散微分方程,并采用多重网格方法和当地时间步长方法加速计算收敛。粘性应力通过Baldwin-Lomax模型计算。为了证明计算结果的有效性,文中也给出了相应的激光测量结果。 

PREDICTION OF INTERNAL FLOW FIELD IN A HIGH SPEED IMPELLER WITH VISCOUS BODY FORCE TECHNIQUE

It is very important of understanding the internal flow field in high speed centrifugal compressor in order to design an impeller with higher efficiency and high pressure ratio.In this paper,a three-dimensional viscous code has been developed to solve simplified Reynolds-averaged Navier-Stokes equations .The viscosity is simulated with viscous body force method.The governing equations are spatially discretized in the cell-vertex finite volume scheme on a simple H mesh and temporally integrated by an explicit two-step Runge-Kutta scheme.The turbulence closure is made by using Baldwin-Lomax model.This code is demonstrated for predicting the internal flow field of a high speed impeller.Some laser measure data are also illustrated to testify the calculated results.