羽流燃气属性对近距平板的受力影响研究

Investigation on the Force Effects of a Close Range Plate by Plume Gas Properties

以研究真空羽流环境下近距卫星底板的受力问题为目的,采用基于NS方程的连续流数值仿真方法开展分析研究。发现了燃气比热比通过影响激波形状和膨胀扇区进而影响下游平板受力的结果。获得了比热比和总压为该类问题关键参数,平均分子量和总温为非关键参数,以及比热比增加将导致羽流在底板上产生的轴向力减小的结论。通过等效比热比混合气体的计算结果,说明了开展该类喷流影响模拟试验的可行性。

Aiming at the force effects by plume on satellite baseplate within a close range,the continuous flow simulation based on NS equation is adopted in this research.It is found that the specific heat ratio affects the force on the plate by affecting the shape of shock wave and expansion fans.It is concluded that the specific heat ratio and total pressure are the key parameters of this problem,while the average molecular weight and total temperature are non key parameters,and the increase of specific heat ratio will decrease the axial force generated by the plume on the baseplate.The computational results also illustrate that it is feasible to simulate the effects by mixture with equivalent specific heat ratio in an experiment.