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考察了作为高超音速飞行器冷却剂的吸热型烃类燃料挂式四氢双环戊二烯exo THDCPD、甲基环己烷MCH以及对比样航煤RP 3的热稳定性能。结果表明 ,三种燃料的热氧化沉积在某温度下存在波峰 ,热裂解沉积随温度升高迅速增加 ,基本呈指数关系。RP 3的热稳定性能最差 ,THDCPD与MCH较为接近 ,在高温时优于MCH。随进料流量的增加 ,热裂解沉积不断增加 ,热氧化沉积先增加 ,在高流量时趋于定值。PhilipsXL30ESEM环境扫描电子显微镜分析表明 ,三者的热氧化沉积及热裂解沉积有着不同的形态。热裂解沉积均发现了含有金属微粒长条状的细丝碳 ,这一现象在MCH热裂解沉积中最为显著。
The thermal stability of exo-THDCPD, methylcyclohexane MCH, and comparative sample jet RP 3 as endothermic hydrocarbon fuels for hypersonic vehicle coolant was investigated. The results show that the thermal oxidative deposition of the three fuels has a peak at a certain temperature, and the pyrolysis deposition rapidly increases with the increase of temperature, which is basically exponential. RP 3 has the worst thermal stability, THDCPD is closer to MCH and better than MCH at high temperature. With the increase of the feed flow rate, the pyrolytic deposition increases continuously, the thermal oxidation deposition increases first, and tends to be constant at high flow rates. PhilipsXL30ESEM environmental scanning electron microscopy analysis showed that the three thermal oxidation deposition and pyrolytic deposition has a different morphology. Thermal cracking and deposition both found filamentous carbon with elongated metal particles, which was the most prominent in MCH thermal cracking deposition.