The deceleration effect of the deployable aerodynamic decelerator is not as good as a parachute in the subsonic region. This paper proposes a novel concept of using a parachute-like configuration (PLC) to enhance the deceleration performance of the mechanically deployable aerodynamic decelerator (MDAD) through structural transformation. The MDAD turned into the PLC from the sphere cone configuration (SCC) at Ma 0.8. The aerodynamic characteristics of the two configurations are analysed deeply. Compared to the SCC, the results show that the drag coefficient increases effectively, and the maximum increases is about 10% in the PLC. The airflow is altered by the MDAD configuration, which can affect the surface pressure and temperature. During the transformation process, the axial and normal force coefficients tend to stabilise. However, the static stability of the PLC deteriorates sharply compared to the SCC when the angle-of-attack exceeds 45°.

中文翻译：

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机械展开式气动减速器不同构型亚音速气动特性

可展开气动减速器在亚音速区域的减速效果不如降落伞。本文提出了一种利用类降落伞结构（PLC）通过结构改造来增强机械可展开气动减速器（MDAD）减速性能的新概念。 MDAD 在 Ma 0.8 处从球锥结构 (SCC) 转变为 PLC。深入分析了两种构型的气动特性。与SCC相比，结果表明，PLC的阻力系数有效增加，最大增加约10%。 MDAD 配置会改变气流，从而影响表面压力和温度。在转变过程中，轴向力和法向力系数趋于稳定。然而，当攻角超过45°时，PLC的静态稳定性与SCC相比急剧恶化。