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为了解决超声速燃烧室内局部煤油当量油气比过高造成的点火及稳定燃烧困难,在Ma=5,总当量油气比接近的条件下,研究了不同煤油喷注位置相互匹配方法对发动机点火性能和推力性能的影响。研究结果表明:多个油位匹配喷注,有利于煤油点火及燃烧,发动机推力性能更好。“值班火焰”引燃煤油时,其余煤油由更多位置喷注且单个位置当量油气比更低时更容易点火燃烧。“值班火焰”的当量油气比由0.51增加到0.55时,煤油燃烧性能变差,比冲降低46N·s/kg;当量油气比均为0.51时,其余煤油由三个位置喷注比两个位置喷注时比冲增加66N·s/kg。同一截面内上部壁面喷注结合下部支杆喷注,可以优化煤油在燃烧室高度方向上的分布,获得更好的发动机性能。上游位置喷注对煤油的预混作用不明显,煤油未燃烧会造成“值班火焰”当量油气比升高,导致发动机点火性能和推力性能变差。
In order to solve the ignition and stable combustion problems caused by the high kerosene ratio in the supersonic combustion chamber, under the condition of Ma = 5, the total equivalent gas-oil ratio is close, the ignition performance and thrust of different kerosene injection positions are studied. The impact of performance. The results show that the injection of multiple oil levels is favorable for the ignition and combustion of kerosene, and the thrust performance of the engine is better. “Fire on duty ” When igniting kerosene, the remaining kerosene is more easily injected and ignited at a single location with lower gas-oil ratios. When the equivalent gas-oil ratio increased from 0.51 to 0.55, the combustion performance of kerosene became worse and the specific impulse decreased by 46 N · s / kg. When the equivalent ratio of gas to oil was 0.51, the remaining kerosene was injected at three positions Specific jet injection when the increase of 66N · s / kg. The injection of the upper wall in the same section with the injection of the lower strut can optimize the distribution of kerosene in the height direction of the combustion chamber and achieve better engine performance. The injection of upstream has no obvious effect on the premixing of kerosene. The unburned kerosene will result in higher “on-duty flame” equivalent gas-liquid ratio, resulting in poor ignition and thrust performance of the engine.