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研究了火箭/冲压喷气混合剪切层的燃烧机理。利用气体扩散燃烧器对甲烷-空气进行了实验。用Ar、N_2及CO_2稀释甲烷,研究了包含火箭排气在内的惰性气体对点火及火焰传播现象的影响。本研究明确了H,O,OH基的浓度在点火过程中起的重要作用。惰性气体使这些基的浓度及绝热火焰温度下降,结果起着妨碍点火的作用。另外,惰性气体浓度及反应热分布梯度越大,火焰带的宽度越狭窄。在本实验中还观察了浓度梯度场的正常火焰。
The combustion mechanism of rocket / ramjet shear layer was studied. Methane-air experiments were conducted using gas diffusion burners. Methane was diluted with Ar, N 2 and CO 2 to study the influence of inert gases including rocket exhaust on ignition and flame propagation. This study clearly H, O, OH concentration in the ignition process plays an important role. Inert gases reduce the concentration of these radicals and the temperature of the adiabatic flame and, as a result, act as an impediment to ignition. In addition, the larger the inert gas concentration and the gradient of the reaction heat distribution, the narrower the width of the flame zone. In this experiment also observed the normal gradient of the concentration gradient field.