| 摘要: |
| 针对当前超燃冲压发动机热防护技术面临的困境,为了突破更高飞行马赫数下的热障限制,提出了一种采用冷却剂与被动材料共同承担热载荷的主被动复合热防护技术。分析了主被动复合热防护技术的设计内涵及总体设计原则,讨论了被动层承担的热载荷和被动复合材料的导热系数、厚度之间的关系,并以C/SiC作为被动复合材料,对比分析了主被动复合热防护方案的优势。研究表明,当C/SiC厚度为4mm时,大致可将马赫数为6.5,当量比0.5工况下的热流密度降低42%。 |
| 关键词: 超燃冲压发动机 主被动复合热防护 热载荷 C/SiC |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金(51276047);国家杰出青年基金(50925625)。 |
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| Design and Consideration of Active and Passive Combined Thermal Protection System of Scramjet |
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BAO Wen1, ZHANG Cong1, QIN Jiang2, YU Da-ren1
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(1.School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2.Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150001, China)
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| Abstract: |
| For the predicament in thermal protection technology of the Scramjet, a new active and passive combined thermal protection technology which uses the coolant and passive materials to bear the thermal load is put forward. Based on this technology, it is hopeful to achieve the development of high Mach and break through the thermal barrier limiting. And then design connotation and overall design principles are analyzed. Meanwhile, the relationships among the heat load shared by the passive construction, thermal conductivity and thickness of passive materials are discussed. The C/SiC is selected as the passive material to analyze the technology advantages of the active and passive combined thermal protection technology. When the thickness of C/SiC is 4mm, the heat flux could be broadly reduced by 42% at Ma=6.5and equivalence ratio 0.5. |
| Key words: Scramjet Active and passive combined thermal protection Heat load C/SiC |
