Abstract

This paper presents a simplified, transient and local thermal non-equilibrium model to simulate the cooling processes of ablation and transpiration. The errors caused by the assumption of the local thermal equilibrium are discussed, and the performance of ablation and transpiration cooling is investigated by the local thermal non-equilibrium model. The discussion and investigation indicate that in the ablation and transpiration cooling process, the effect of the thermal non-equilibrium and the variation of thermal properties should be considered, and the Biot number, Stefan number, heat flux as well as coolant mass flow rate are the important parameters to control the thickness loss due to material ablation.

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