复杂构型前缘疏导热防护技术

针对前缘驻点区热流密度高、热流梯度大的特点,基于疏导式热防护思想,研制了一体化疏导式热防护前缘结构.根据力热承载要求,设计了一体化薄壁结构方案,内部充装碱金属工质,在气动加热条件下形成工质相变及输运的热管式闭式循环,实现驻点区热量的快速疏散.通过结构封装、热管充装等工艺流程,实现结构样件,最终通过了飞行试验验证.结果表明,疏导结构启动时间约为94.5 s,疏导效率达到23.4%.

Complex Dredging Thermal Protection Structure for Leading Edge

Based on dredging thermal protection method, an integrated leading edge structure was proposed to accommodate the severe heat flux and high heat flux gradient at the stagnation point. Considering the heat and force loadings, a thin shell structure with internal working medium was designed. Under thermal heating conditions, phase change and circulation of the working medium were established to achieve rapid heating transportation for the stagnation zone. The structure was integrated and then charged with working medium, and finally verified in flight test. The results showed that it started at about 94.5 s, and the thermal dredging efficiency achieved 23.4%.