弹丸在高速飞行时外流场的可压缩性在早期发展的湍流模型中没有体现出来。文中依托OpenFOAM软件平台研究带可压缩性修正的k-ε湍流模型对弹丸气动计算的影响。分别将标准k-ε模型和带有可压缩修正的k-ε模型应用到弹丸气动计算中,发现带有可压缩修正的模型更能反映流场的特性,其计算值与试验值更加接近。结果表明,弹丸高速飞行时外流场的可压缩性是不容忽视的,可压缩修正模型能显著提高气动参数的计算精度。

The compressibility of the flow field out of the projectile was not considered when the traditional turbulence model was derived. In this paper, the effect of the k-ε turbulence model with compressibility modifications on the aerodynamic simulation was studied using OpenFOAM software. The aerodynamic parameters were computed respectively using the standard k-ε turbulence model and the modified kε turbulence model. After contrasting the results got by the computation method with the ones gained using experiment method, the results calculated by the modified turbulence model were proved to be more precise than the ones computed by the standard k-ε turbulence model. The results gained in this paper show that the compressibility in the flow field out of the projectile cant be ignored and the compressibility modifications can upgrade the precision of computation evidently.