摘要
利用超声速矩形湍流导管和等离子电弧加热器模拟内外流热环境,通过冷壁热流测量和热防护材料考核对比分析二者的差异。结果表明:由于辐射换热的影响,在选取的两个来流条件下,内流热环境下的冷壁热流比外流热环境下的分别高出41.6%和20.4%。随着冷壁热流的增加,辐射换热的影响力会逐渐减小。在材料考核试验中,相同配方工艺和涂层设计的C/C复合材料在内流热环境下的表面温度高出313℃,背面温度高出160℃,材料表面出现明显烧蚀;而在外流热环境下材料表面完好。因此在气动热考核试验中,需要充分考虑辐射换热的影响,根据材料所处的热环境选择不同的地面试验模拟方法。
Outer and inner flow thermal environment have been compared by measuring the cold-wall heat flux and testing the thermal protection material in the supersonic rectangle turbulent duct and arc heater. Due to the effect of radiation heat transfer, the cold-wall heat flux in the inner flow environment is respectively higher 41.6% and 20.4% than that in the outer flow environment under two kinds of representative flow conditions. When the cold-wall heat flux increases, the effect of radiation heat transfer will gradually decrease. In test experiment of thermal protection material, the surface of the composites in the inner flow is 313℃ higher than those in the outer flow with same formulation and coating design, and rear temperature is 160℃ higher. The composites surface in the inner flow has been ablated obviously, but the composites surface in the out flow is very well. So the radiation heat transfer must be adequately considered in the aerothermodynamic ground experiment, and the simulation method will be chosen depends on the thermal environment of thermal protection material.
出处
《导弹与航天运载技术》
北大核心
2013年第5期70-75,共6页
Missiles and Space Vehicles
关键词
辐射换热
热防护材料
湍流导管
电弧加热器
Radiation heat transfer
Thermal protection material
Turbulent duct
Arc heater
