高超声速典型弹道下的壁板热气动弹性动力学分析

This study builds a two-way coupling model of aerothermoelasticity for two-dimensional panels with TPS in hypersonic flow. The aerodynamic force is calculated by the third-order piston theory, the aerodynamic heat obtained by the Eckert's reference enthalpy method, and the heat transfer carried out on the basis of the finite difference method, with the material properties of the structure fitted with temperature degradation. Finally, the aerothermal module and the aeroelastic module are two-way coupled considering the effect of panel deflection on aerodynamic heat flux, and the aerothermoelastic analysis is conducted in two typical trajectories. The results show that the two-way coupling analysis would cause more severe changes in thermal stress and thermal bending moment, leading to a longer transient chaos for the X-43A trajectory. In the FALCON trajectory, with the two-way coupling, the aerodynamic heating is more intense with a faster temperature drop. Comparison of the two trajectories demonstrates that long-term hypersonic flights are more likely to cause flutter. However, the main problem faced by stronger maneuverability trajectories is buckling, and the strength characteristics of the material need to be considered. Furthermore, it illustrates the necessity of two-way coupling analysis to accurately obtain the aerothermoelastic response of modern aircraft under trajectory conditions.