Ablation-Raditation coupling modeling for Hayabusa reentry vehicle

Abstract Mechanical EngineeringEPFLMaster of Mechanical engineering Ablation-Raditation coupling modeling for Hayabusa reentry vehicle by Valentin MarguetReentry vehicles undergo extreme thermal conditions as they reach hypersonic velocities inparticular conditions. Thus thermal protection system (TPS) are required to prevent the probeto be damaged. When it comes to Earth’s reentry, capsules like Hayabusa are equipped withan carbon phenolic TPS which ablates and releases ablation products into the boundary layerduring reentry. Besides, as radiation can be a significant component of the overall heat load,chemical reactions may occur between the radiators and the ablative injected species so that thewhole aerothermodynamic state is modified.Therefore, an accurate numerical modeling of the thermal, physical and chemical processesinduced by hypersonic reentry , is needed. It implies to couple the fluid solver and the materialresponse code thanks to a partitioned coupling algorithm. As for Hayabusa’s reentry simulationsperformed for the ARC project, ablation-flowfield and radiation-flowfield resulted to be accurateas they were compared to flight data or empirical correlations. Next step of ablation-radiationcoupling consists in experimental tests in plasma wind tunnels and full coupling algorithm.

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