充气式返回舱迎风面真实气体效应

In this paper, a 9-component chemical non-equilibrium model and a perfect gas model were used to study the reentry flow of an inflatable reentry decelerator through numerical simulation. The differences in the calculation results of the two models were investigated. The manifestation of the real gas effect was studied, and the reason for the difference between the real gas effect of inflatable reentry decelerator and that of rigid capsule was explored. The results show that compared to the perfect gas hypothesis, the shock wave position is closer to the wall in the real gas effect. After the shock wave, the air temperature decreases, and the wall heat flux decreases. At 83 km, the specific heat ratio of the gas after the shock wave is higher than 1.4, and the air undergoes a dissociation reaction. At 73 km, the real gas effect is very weak, and the specific heat ratio of the gas after the shock wave remains at 1.4. The air still exists in the form of molecules. The main reason for the difference in real gas strength between inflatable reentry decelerator and rigid capsule in the same altitude range is that the inflatable reentry decelerator has a larger resistance-weight ratio than the rigid capsule. Its speed drops faster after entering the atmosphere, and its speed is lower at the same altitude.