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为探索高金属含量水冲压发动机的稳态燃烧机理,开展了镁基高金属含量水反应金属燃料在水蒸气氛围下的稳态燃烧试验研究,燃料中金属镁含量高于70%。采用直径0.5 mm的K型热电偶测量燃料燃烧波曲线,并拍摄了火焰图片。结果显示,工作压强2.0 MPa时,燃料稳态燃烧的燃面温度约为900.1℃,气相平衡火焰温度约为1 214.9℃;燃烧火焰明亮并紧贴燃面,没有颗粒燃烧形成的火星或轨迹。分析总结了镁基高金属含量水反应金属燃料在水蒸气氛围下的稳态燃烧特性,认为镁颗粒在燃面以熔融状态存在,并与水蒸气在燃面附近进行剧烈的放热反应,水蒸气向燃面的扩散过程是稳态燃烧的关键。
In order to explore the steady-state combustion mechanism of high metal content water-ramjet engine, steady-state combustion experiments of magnesium-based high metal content water-reactive metal fuel under water vapor atmosphere were carried out. The content of metal magnesium in fuel was over 70%. The fuel burn curve was measured with a K-type thermocouple 0.5 mm in diameter and a flame image was taken. The results show that when the operating pressure is 2.0 MPa, the combustion surface temperature is about 900.1 ℃ and the gas equilibrium flame temperature is about 1 214.9 ℃. The combustion flame is bright and close to the combustion surface, and there is no spark or trajectory formed by particle combustion. The steady-state combustion characteristics of magnesium-based high metal content water-reactive metal fuel in water vapor are analyzed and summarized. It is believed that the magnesium particles exist in a molten state on the combustion surface and undergo a violent exothermic reaction with water vapor near the burning surface. The diffusion of steam to the combustion surface is the key to steady combustion.