中文摘要：

对商用CFD软件中的四种湍流模型给出的湍流空气自由射流引射特性计算结果进行了比较，并将采用四种湍流模型计算获得的射流引射量计算数据与文献报道的采用多孔壁技术获得的射流引射量实验数据进行了对比，结果表明：在四种湍流模型中，标准K—ε湍流模型给出的湍流空气自由射流引射规律与实验数据较好符合。本文还选用标准K—ε湍流模型对欠膨胀超声速湍流空气自由射流的引射特性进行了初步的探索研究。

英文摘要：

In this paper, four different turbulence models in commercial CFD software were used to compare the entrainment characteristics of turbulent free air jet and the predicted results from these four different turbulence models were compared to experimental results reported in the literature. It shows that the entrained mass flow rates of the turbulent free jet obtained by standard K -ε turbulence model were close to the reported experimental results. This paper also conducted some preliminary modelling with K-ε turbulence model on the entrainment characteristics of under-expanded supersonic turbulent free air jet.