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针对亚燃冲压发动机燃烧室内部流动特点,在二元稳定器气流试验装置中使用拍摄OH基自发光辐射的方法,研究了火焰稳定器与喷嘴以不同间距匹配情况下的燃烧特性,利用气液两相流模型数值仿真手段,分析了试验工况下燃油雾化液滴与稳定器后方油气比的分布情况。通过对比分析认为,高速气流条件下喷嘴与火焰稳定器间距变化对反应流场影响明显,喷-稳距离增大使火焰前沿位置靠近稳定器尾缘,气流速度较低时出现回火。喷-稳距离减小能够避免回火现象,且气流速度较高时火焰悬停距离大。喷-稳距离增大有利于燃油液滴的蒸发和掺混是影响匹配试验火焰前沿位置靠近稳定器的根本因素。
In view of the characteristics of the internal flow in the combustion chamber of a sub-combustion ramjet engine, the spontaneous emission of OH radicals was photographed in a Binary stabilizer airflow test apparatus. The combustion characteristics of the flame stabilizer and the nozzle at different pitches were studied. Two-phase flow model numerical simulation means to analyze the experimental conditions of the fuel atomized droplets and stabilizer behind the distribution of oil and gas ratio. The comparative analysis shows that the change of the distance between the nozzle and the flame stabilizer under the condition of high-speed air flow has a significant effect on the flow field, and the increase of the spray-stabilizer distance brings the leading edge of the flame close to the tail of the stabilizer and tempering when the airflow velocity is low. Spray - steady distance decreases to avoid tempering phenomenon, and the higher the air flow velocity flame hover distance. Spraying - steady distance increases in favor of the fuel droplets evaporation and blending are the basic factors that affect the flame front position close to the stabilizer.