用粘性体积力方法计算高速离心压气机叶轮内部流场

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

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。

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.