应用新型紊流模型对压气机叶栅通道紊流流场进行数值研究

NUMERICAL ANALYSIS OF COMPRESSOR CASCADE FLOW WITH NOVEL TURBULENCE MODELS

采用３种紊流模型来封闭Ｎ－Ｓ方程，它们分别是标准的Ｋ－ε两方程模型；发展的隐式Ｋ－ε两方程模型和基于ＲＮＧ方法的紊流模型。与标准的Ｋ－ε两方程模型相比，发展的Ｋ－ε两方程模型通过在紊流耗散率方程中增加一项，来说明若干时间尺度，以提高对壁面附近流动的预测能力；基于ＲＮＧ方法的紊流模型在紊流耗散率方程中增加一项Ｒ，能较好地体现大剪切率所产生的强烈的各向异性效应及非平衡效应。应用３种紊流模型对三维压气机叶栅通道紊流流动进行数值分析，并与实验数据比较，结果表明，采用后两种紊流模型计算得到的值与实验数据更接近。

An explicit N-S solver has been written at the option of one of three turbulence models:Standard K-ε model is an implicit K-ε model coupled with the explicit N-S solver in a novel way which takes account of multiple time scales by adding an extra term to the dissipation equation,and turbulence model based on RNG method which takes account of unbalance effect by adding an extra term to the dissipation equation.The code has been applied to numerical analysis of the flow in the compressor cascade.Three solutions obtained with the three correspondent turbulence models are compared with the experimental results by Flot,R and Papalion,K.It is shown that the results with later two turbulence models become closer to the experimental results.