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为了研究复燃对液氧煤油发动机尾焰冲击特性的影响,建立了液氧煤油发动机尾焰冲击数值计算模型,并基于模型研究了喷管出口距离平板3m,5m两种工况下复燃对尾焰冲击特性的影响。结果表明:模型考虑了发动机内部燃烧对尾焰冲击特性的影响,计算得到了主射流区的激波结构;复燃增大了尾焰自由射流区和壁面射流区的高温区域,改变了自由射流区和滞止区的形状结构;平板壁面压力随着径向距离增大而逐渐减小,并且3m工况时在1.8m和2.5m处分别出现2.5倍环境压力和1.5倍环境压力的波动,5m工况时在2m处出现1.5~2倍环境压力的波动,在波动之后平板壁面上压力很快降为环境压力,复燃对5m工况的波动较3m工况影响大。
In order to study the influence of the re-ignition on the impact characteristics of the tail of a liquid oxygen-kerosene engine, a mathematical model for calculating the tail-flame of a liquid oxygen-kerosene engine was established. Based on the model, Impact of tail flame impact. The results show that the model considers the influence of combustion inside the engine on the impact characteristics of the tail flame and the shock structure of the main jet region is calculated. The re-ignition increases the high temperature region of the free jet region and the wall jet region, Zone and stagnation zone. The pressure on the flat surface decreases with the increase of the radial distance, and the fluctuations of 2.5 times of ambient pressure and 1.5 times of ambient pressure occur at 1.8m and 2.5m at 3m, In the 5m condition, the pressure fluctuates 1.5-2 times at 2m, and the pressure on the wall of the flat plate quickly drops to the ambient pressure after the fluctuation. The fluctuation of the re-ignition on the 5m working condition has a greater influence on the 3m working condition.