Multi-temperature model from state-specific data for Hydrogen/Helium mixture in high-enthalpy flows

The paper presents a multi-temperature model for H2/He mixture derived from the state-to-state kinetics. Electronically excited states have been included in the model as separate pseudo-species. The theoretical approach on the reduction of a state-specific model to multi-temperature kinetic is described in detail in the Supplementary Material , reporting also analytical fits. The model has been verified against state-to-state calculations in 0D approximation, demonstrating a good degree of accuracy. The verification has also been performed investigating the hypersonic flow past a two-dimensional capsule entering in Uranus atmosphere.