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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 projectile at the high-speed flight is not reflected in the turbulence model developed in the early stage. The paper relies on the OpenFOAM software platform to study the influence of k-ε turbulence model with compressibility correction on the projectile aerodynamic calculation. The standard k-ε model and the k-ε model with compressible correction are respectively applied to the projectile aerodynamic calculation. It is found that the model with compressible correction can better reflect the characteristics of the flow field, and the calculated value is closer to the experimental value. The results show that compressibility of outer flow field can not be ignored when projectile flying at high speed, compressibility correction model can significantly improve the accuracy of aerodynamic parameters.