疏导式热防护结构传热极限特性

疏导式热防护结构通过高温热管将前缘驻点等高热流部位的热量快速疏导至大面积区域，可有效降低防热压力，实现新型飞行器前缘非烧蚀防热。然而，疏导结构内部液体工质回流受到飞行器加速过载的显著影响。通过理论评估与地面试验获得了典型过载条件下尖前缘热疏导结构的抗过载性能。结果表明，维持加热条件不变，当过载环境大于4g后，热疏导性能受到明显影响，但过载减小后疏导性能得以快速恢复。研究结论对于一体化疏导结构的设计具有重要的指导意义。

Heat transfer limit characteristics of integrated dredging thermal protection structure

Through phase change and transportation of internal working medium, the integrated dredging thermal protection structure can efficiently deliver heat from stagnation point to other larger areas, achieving non-ablative heat shielding for sharp leading edges of advanced vehicles. Nevertheless, the back-flow of the liquid medium relies on the capillary force in the capillary structure, which will be affected by overloading during the flight. A ground test was carried out and the overload characteristic of the integrated dredging thermal protection structure was obtained. The isothermal condition was significantly influenced by overload larger than 4g, and the thermal dredging performance recovered immediately after the overload decreased. The study is instructional for the estimation and design of integrated dredging thermal protection structures of leading edges.