Ablative cooling

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Ablative cooling, ablation - in aviation: a type of reduction of the surface temperature of very fast ships moving in dense layers of the atmosphere. It gives the possibility of exceeding the thermal barrier of space vehicles that return to Earth.

This process is based on evaporation or sublimation of the so- Ablative layer, which is formed by special evaporation materials, called ablators (eg, heat-resistant polymers reinforced with inorganic fibers, as well as epoxy resins or lithium). These materials evaporate during penetration into the upper layers of the atmosphere.

The ablative cooling involves directing the high-speed and high-temperature gas stream to the ablative layer, whereby the ablation layer changes into a low porosity porous coke layer. Bibliography

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