The thermal performance prediction and development of ablator for reentry probes using a smallsat.

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It was performed that the development and a performance prediction of lightweight ablator. The beginning of heating, heat flux due to the gas advection plays an important role for heat transfer. The variation of permeability of the ablator is very effective on the thermal response of the ablator.A trajectory-based flow field simulation around Hayabusa capsule loaded lightweight ablator coupled with thermal response was carried out. The pyrolysis gas flow transport energies to the direction of rear wall and it makes the apparent heat conduction higher. The difference of stagnation heat flux between heavy ablator and lightweight ablator is very small. The surface recession of lightweight ablator is few times larger than heavy ablator. Therefore, this study shows lightweight ablator cannot use same thickness but it suggests that it can prevent heat by slightly increasing the thickness of the lightweight ablator.