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%。
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 Maeh and break through the thermal barrier limiting. And then design connotation and overall design principles are an- alyzed. Meanwhile, the relationships among the heat load shared by the passive construction, thermal con- ductivity 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 4ram, the heat flux could be broadly reduced by 42% at Ma = 6.5 and equivalence ratio 0.5.
出处
《推进技术》
EI
CAS
CSCD
北大核心
2013年第12期1659-1663,共5页
Journal of Propulsion Technology
基金
国家自然科学基金(51276047)
国家杰出青年基金(50925625)
