Complex Dredging Thermal Protection Structure for Leading Edge
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摘要: 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%.Abstract: 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%.
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Key words:
- dredging thermal protection /
- leading edge /
- heat-pipe /
- start-up /
- thermal dredging efficiency
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图 5 疏导结构风洞试验件照片
Figure 5. Dredging thermal protection structure for leading edge for wind tunnel test
图 6 疏导前缘石英灯加热试验
Figure 6. Quartz lamp heating test of dredging thermal protection leading edge
图 7 疏导前缘电弧风洞加热试验
Figure 7. Wind tunnel heating test of dredging thermal protection leading edge
图 8 疏导前缘石英灯加热试验温度响应
Figure 8. Dredging thermal protection leading edge temperature variation of quartz lamp heating test
图 9 疏导前缘结构件测点布置
Figure 9. Temperature test points of dredging thermal protection leading edge
图 10 疏导结构尾盖板飞行试验温度变化
Figure 10. Temperature variations of back plate of dredging thermal protection structure(DTPS) in flight test
图 11 疏导结构飞行试验温度变化与非疏导结构风洞试验温度变化对比
Figure 11. Comparisons of temperature variations for dredging thermal protection structure(DTPS) in flight test and conventional structure(N-DTPS) in wind tunnel heating test
图 12 飞行试验疏导结构尾盖板温升速率
Figure 12. Temperature increase rates of back plate of dredging thermal protection structure in flight test
图 13 电弧风洞试验非疏导结构尾盖板温升速率
Figure 13. Temperature increase rates of back plate of conventional structure in wind tunnel test
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