摘要
对内流热环境的热流测量方法进行了试验研究和模拟,对比分析了内流热环境与外流热环境的不同。采用超声速矩形湍流导管试验技术,利用等离子电弧加热器进行了内流与外流热环境的表面冷壁热流测量和材料考核试验。结果表明:在来流条件相同的情况下,与外流热环境下的测量值相比较,内流热环境下的冷壁热流值高出40%多,相同材料的背面温度高出400℃。通过直接测量的冷壁热流换算得到的热壁热流值却不到外流热环境下的热壁热流值的50%。因此,进行发动机防热设计时,必须进行材料考核试验,必须考虑材料的使用热环境,否则对材料的烧蚀性能的评估影响很大。
The heat-flux measurement method of the inner flow thermal environment was experimentally studied and simulated. And the difference between inner flow and the outer flow thermal environment was contrasted and analyzed. The supersonic rectangle turbulent duct technique and are heater were used to measure the cold-wall heat-flux and test the material. The result indicates that in the same flow complexion, the cold-wall heat-flux of inner flow thermal environment is 40% higher than that of outer flow, and the back-temperature of the same material in inner flow is above 400℃ lower than that of other side of the material in outer flow. The hot-wall heat-flux of inner flow, transformed directly from the cold-wall heat-flux measurement, is 50% less than that of outer flow, and in the course of the scramjet heat-protection design, the material test experimentation must be carried through, and the thermal environment of the material must be considered. Or the influence on evaluating the ablation capability of the material may be unfavorable.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2009年第2期30-33,共4页
Aerospace Materials & Technology
关键词
内流热环境
外流热环境
热流模拟方法
热流密度
电弧加热器
Inner flow thermal environment, Heat flux, Arc heater Outer flow thermal environment, Heat-flux simulation method,
