Thermal Regulation Performance Study of Thermal Protection Structures Based on Photonic Crystals
The new high-speed aircrafts face long-time high heat flow loads in service,and the tra-ditional thermal protection structure is limited by the material's own performance,which is difficult to meet the structural lightweight design requirements.Photonic crystals are expected to improve the thermal control capability of thermal protection structures due to the typical characteristics of their photonic band gap.In this paper,a novel thermal protection structure based on photonic crystal is proposed,which has better radiation and reflective properties,and enhances the thermal radiation regulation capability of the traditional thermal protection structure.The wave propa-gation characteristics of photonic crystal structures are solved using the transfer matrix method,while considering the effects of high-temperature environment and polarization characteristics.The reflectivity of photonic crystals under different conditions is calculated.The heat transfer charac-teristics of the photonic crystal thermal protection structure are calculated under different radiation load conditions.The thermal regulation ability of the photonic crystal structure is characterized by introducing a regulation factor.The results indicate that photonic crystals have excellent thermal insulation performance.The bottom temperature of the substrate structure can be obviously re-duced.This research provides a promising new direction for the development of thermal protection structures.
photonic crystalsthermal protection structureradiation analysisphotonic band gaptransfer matrix method
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