考虑变形影响的棱台式柔性外形气动力/热环境研究

文章首先根据机械可展开式再入/进入技术的结构形式建立了棱台式柔性外形简化模型;然后通过流-固耦合分析研究了该外形在气动力作用下的变形规律,获取其迎风面具有"下凹"的变形特征;并根据该变形特征修正了气动面模型,应用修正后的模型再分析,得出了气动力和气动热沿径向分布及气动热随时间变化的规律。研究发现:考虑变形影响的棱台式柔性外形在棱边附近处出现了气动力/热集中现象,全流域气动热环境变化趋势与刚性回转体外形基本一致。此研究结果不仅可为机械可展开式再入/进入技术的气动力/热特性研究奠定基础,还能为其他柔性外形的气动研究提供借鉴。

Aerodynamic force and heat environment of prismatic flexible aeroshell with consideration of its deformation

Firstly, this paper establishes a simplified model of the prismatic flexible aeroshell according to the requirements of the mechanical deployable reentry and entry technology. Secondly, based on the fluid-solid coupling analysis, the deformation of the flexible aeroshell under the aerodynamic action is obtained, as well as the deformation characteristics of the central depression. Lastly, the aeroshell model is modified according to the deformation characteristics, and the radial distribution of the aerodynamic force and heat and the variation of the aerodynamic heat against the reentry and entry time are analyzed again using the modified model. It is shown that the aerodynamic force and heat concentrations occur at the edge of the prismatic flexible aeroshell, and the variations of the aerodynamic heat environment in the whole reentry and entry process is basically consistent with those of a rigid rotary aeroshell. This research not only provides a basis for understanding the aerodynamic characteristics of the mechanical deployable reentry and entry technology, but also provides a reference for aerodynamic studies of other flexible aeroshells.