Abstract: In order to study the physics and chemistry process of photochemical ignition of H₂-O₂-Cl₂ mixtures, the analysis model is firstly presented. Then the temperature and the concentration of the particles in the photochemical ignition process under the different pressure behind shock waves and the temperature behind shock waves are calculated. Finally, the figures are plotted to analyze the photochemical ignition process, and the conclusions are deduced. The analysis result indicates that the photochemical ignition can adapt to the low pressure of high altitude. H₂-O₂ chain reaction will not start up until the temperature reaches 700K. When the temperature and pressure behind incident shock wave decrease, the photochemical ignition delay times will increase.

Key words: Aircraft engine;Photochemical ignition~+;Mixed fuel;Chain reaction

摘要： 为了研究在H2 O2 Cl2混气中以光化学方式点火的具体物理化学过程,首先建立分析模型,然后根据此模型计算不同爆炸波后压力和温度下的光化学点火过程中温度变化以及各种粒子的浓度变化,最后根据计算结果进行绘图,并深入分析光化学点火过程。分析结果表明,光化学点火方式可以适应高空下的低压状况;在温度达到700K之后,H2 O2链式反应才会启动;光化学点火延迟时间随初始爆炸波后温度和压力的降低而增长。

关键词: 航空发动机;光化学点火+;混合燃料;链式反应