关键词: 充气式再入减速器, 结构特性, 飞行轨迹参数, 内充压气体, 流固耦合

Abstract: Aiming at the variation of the structural characteristics of an inflatable reentry reducer in dynamic flight environment, a loading method of CFD dynamic boundary by the flight trajectory parameters is proposed, which effectively realizes the coupling between the flight dynamics and the aerodynamics. At the same time, a fluid-solid coupling model considering the thermal effect of inflation gas is established, which considers the influence of structural deformation on flow field and the variation of the state parameters of inflation gas more comprehensively than the existing methods, breaking through the limitation that the influence of temperature on structural characteristics can not be fully considered in the existing research. The model is used to compare the effects of aerodynamic and aeroheating on structural deformation and first order frequency during reentry, and the influence of structural size on structural characteristics is studied. It is found that the maximal stress of the structure increases to 39.6 MPa and 33.5 MPa respectively when aerodynamic and aeroheating are considered separately, while reducing the half taper angle and increasing the number of gasbags properly are beneficial to reducing the stress during reentry. This study provides valuable reference for strength checking and optimal design of an inflatable reentry reducer.

Key words: Inflatable reentry reducer, Structural characteristics, Flight trajectory parameters, Inflation gas, Fluid-solid coupling