飞船返回舱跨声速全局稳定性研究

根据国内外在飞船返咽舱这类短钝飞行器的亚、跨声速风洞试验中都发现了极限环振动形态这一问题，利用全局稳定性分析和数字仿真方法，研究了返回舱在跨声速和高亚声带飞行时的动稳定性，得到与风洞试验类似的结果，即返回舱处于极限环振动形态。因此，在返回舱再入亚、跨声这飞行段，为保证飞行安全，采用有效和可靠的姿态控制系统来控制和减缓动不稳定影响是必需的。

The Global Stability Analysis of Reentry Capsule Transonic Flight

The transonic aerodynamic and dynamic characteristics of reentry capsules play an important part in its design. For short blunt aircraft such as reentry capsule, limiting circle oscillation forms have been discovered in subsonic and transonic wind tunnel experiments. In the present paper, global stability analysis and numerical simulation is employed to research the dynamic stability of a reentry capsule at transonic and high subsonic speed. The results show that the capsule is in limiting circle oscillation. This conclusion is agreement on the results obtained from wind tunnel experiments. Therefore, an effective and reliable attitude control system, which is used to eliminate or reduce the dynamic instability, is necessary during subsonic and transonic reentry flight.