超音速射流流场中湍流模型

为了确定适用于超音速射流流场数值模拟的湍流模型，首先从理论上分析常用的五种湍流模型之间的差异及其适用范围；其次，采用五种湍流模型，分别对不同马赫数下超音速射流流场进行数值模拟，将数值模拟结果与实测值和理论值进行对比分析.结果表明：剪切压力传输k-ω模型与其他模型相比，通过对输运方程的修正，保证其在计算射流流场时具有较高的准确性；在喷管内部和外部射流流场的模拟中，剪切压力传输k-ω模型的计算结果与理论值和实测值具有较高的吻合度，在五种湍流模型中最适合于超音速射流流场的数值模拟研究.

Turbulence model in supersonic jet flow field

To determine a suitable turbulence model for the numerical simulation of supersonic jet flow fields, the differences and application scopes of five turbulence models were analyzed theoretically first, and then supersonic jet flow fields with different Mach numbers were numerically simulated using these five turbulence models. The numerical simulation results were comparatively analyzed with the measured and theoretical values. It is shown that compared with other models, the shear stress transmission k-ω (SST k-ω) model has a relative higher accuracy in calculating the supersonic jet flow fields through modifying the transport equation. In the simulation of flow fields inside and outside the nozzle, the simulation result of the SST k-ω model is more in agreement with the measured and the theoretical values. Among the five turbulence models, the SST k-ω model is most suitable for the numerical simulation of the supersonic jet flow fields.