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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。
In this paper, a simplified model of pyramid profile is established based on the structural form of mechanical expandable reentrant / entry technology. Then the deformation of the profile under aerodynamic force is studied through the fluid-solid coupling analysis, According to the deformation feature, the aerodynamic surface model was modified. The modified model was used to reanalyze the aerodynamic force and aerodynamic heat along the radial distribution and the aerodynamic heat with time. It is found that the aerodynamic / thermal concentration near the edges of the pyramidal flexible profile considering the effect of deformation is concentrated, and the tendency of the aerodynamic thermal environment in the whole basin is basically the same as that of the rigid rotor. The results of this study not only lay the foundation for the study of aerodynamic / thermal properties of mechanically deployable reentrant / entry technologies, but also provide references for the aerodynamic research of other flexible profiles.