充气圆环外径尺寸对充气式减速器结构受力特性的影响

Effect of outer diameter size of inflatable tour on structural mechanical characteristics of inflatable decelerator

充气式减速器在高超声速减速过程中承受巨大的气动力和气动热载荷。为优化充气式减速器在复杂载荷下的受力特性,以NASA的IRVE-3项目为原型,建立4种充气圆环外径尺寸的充气式减速器模型,开展Ma=5飞行条件下的单向流−固−热耦合分析,对比气动力载荷、气动热载荷和两载荷叠加等情况下,充气圆环外径尺寸对充气式减速器受力特性和温度分布的影响。结果表明:充气圆环的外径越小,充气式减速器的整体变形越小,温度越高,防热层应力越高;外径越大,充气圆环的应力集中越明显。可见,过大或过小的充气圆环外径尺寸对充气式减速器的受力特性均有负面影响,减速器设计中须针对具体对象综合考量确定。以上研究结果可为未来的充气式减速器设计提供参考。

Inflatable decelerator is subject to significant aerodynamic and aerothermal loads during hypersonic deceleration.To optimize the mechanical characteristics of inflatable decelerator under complex loads,four inflatable decelerator models with different sized outer diameter inflatable tours were established based on NASA’s project IRVE-3.A unidirectional fluid-solid-thermal coupling analysis under Ma=5 flight condition was carried out.The effects of the outer diameter size of inflatable tours on the mechanical characteristics and temperature distribution of the inflatable decelerator under aerodynamic,aerothermal,and superimposed loads were compared.The results show that the smaller the outer diameter of the inflatable tour is,the smaller the overall deformation,the higher the temperature,and the higher the stress in the thermal protection layer.The larger the outer diameter is,the greater the stress concentration of the inflatable tour.It indicates that either too large or too small size of the outer diameter of inflatable tours has a negative impact on the mechanical characteristics of the inflatable decelerator.The proposed study may provide a reference for the inflatable decelerator design in the future.