Multi-physical Analysis of Ablation Based on Peridynamics

Ablation thermal protection is one of the most important methods in the thermal protection of hypersonic vehicle. Its numerical simulation is challenging and complicated due to the multi-physical coupling process among chemical reaction, heat transfer and ablation recession. In this study, a multi-physical analysis approach for the stripping process during ablation based on peridynamics is proposed. The energy balance on the ablative wall has been taken into account for the thermal boundary conditions, and then the temperature field is obtained by using bond-based peridynamics. Then, the temperature-dependent dimensionless mass flux and surface recession rate are evaluated by solving the equations involving mass conservation of surface elements and chemical equilibrium of reactions. Meanwhile, considering the breaking of bonds and the deletion of points in this model, the phenomenon of ablation and stripping process of material on the surface can be simulated. Finally, the results of ablation recession rate and stagnation point temperature in the case of C/C and C/SiC composites yield greater accuracy compared with the experiments in the literature.