The invention discloses a sweating and cooling composite
thermal protection structure based on a porous
metamaterial, which belongs to the technical field of active
thermal protection of aircrafts and comprises a layered
metamaterial composite structure body. The layered
metamaterial composite structure body sequentially comprises a spectrum stealth porous
superstructure layer, an
infrared thermal stealth porous
superstructure layer and a hydrogel filling layer from top to bottom. The
infrared thermal stealth
superstructure porous material is used as a core, the anisotropic
thermal conductivity characteristic of the
infrared thermal stealth porous superstructure layer is achieved through the micro-nano structure design and different
porosity distribution, transfer of
surface heat flow in the horizontal direction and transfer of heat to the
coolant phase change layer in the vertical direction can be accelerated, a sweating cooling mechanism is triggered, and the
heat transfer efficiency is improved. Local high temperature of the surface is effectively eliminated, the average temperature of the surface is rapidly reduced, and the heat
radiation amount is reduced, so that efficient
thermal protection is achieved, the infrared thermal stealth function is achieved, and the spectrum stealth requirement is also met by combining the surface spectrum stealth porous superstructure layer.