球锥形头罩高超声速绕流流场数值模拟

Numerical simulation of hypersonic flow fields around sphere-cone-shaped dome

研究了不同飞行参数下球锥形光学头罩的高超声速绕流流场的数值模拟问题。首先,分别利用k-ε湍流模型和SA湍流模型求解N-S方程,获得了球锥形光学头罩绕流流场的模拟结果。然后,将模拟结果与风洞测试得到的实验数据进行比较分析。结果表明,在高马赫数、大迎角情况下采用k-ε湍流模型可以得到相对更准确的计算结果。最后,对流场的温度、压强、密度分布特性进行了分析,给出了球锥形头罩绕流流场的压强、温度和密度随飞行参数的变化规律。

The numerical simulation of hypersonic flow fields around sphere-cone-shaped dome under different flight conditions was studied. Firstly,by separately applying k-ε turbulence model and SA（ Spalart-Allmaras） turbulence model to solve the N-S equations,the flow fields around sphere-cone-shaped optical dome were simulated. Secondly,the simulation results were compared with related experimental data,and the comparison shows that,under the condition of high Mach number and attack-angle more accurate calculation results can be obtained when using k-ε turbulence model. Lastly,the distribution of pressure,temperature and density of the flow fields around sphere-cone-shaped dome was analyzed,and the variation of the three parameters with flight condition was also presented.