A Multi-Species High-Fidelity Material Response Framework for Ablation Physics

With an increasing level of complexity in aerospace missions, a high-fidelity model of material response model is needed. It also becomes clear that the volatile chemical species that evolved during the ablation can alter the performance of the Thermal Protection System as well as the outer flow field. In this work, the pyrolysis gas is modeled as a non-equilibrium multi-species gas mixture instead of a bulk gas. The proposed gas model is based on the experimental data based on the pyrolysis of Phenolic Impregnated Carbon Ablator (PICA). The generation of non-equilibrium gas will also have an impact on the boundary layer flows since each gas component will be coupled and react with the external flow. In the final version of this study, we believe the proposed model can provide a higher level of confidence in the material response analysis when a new atmosphere is considered.