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为了研究等离子体点燃超音速混合气流的过程,设计并验证了超音速燃烧室的三维计算模型,计算出了燃烧室等离子体点火时的流场参数和化学反应规律,分析了等离子体点火对燃烧室内燃烧的影响。计算结果表明:高温等离子体射流的滞止作用通过增加混合气在燃烧室内的停留时间提高了点火效率;等离子体点火时燃烧区域的压力扩散比较充分,内部为压力相对平衡的低速流动;高温等离子体射流高速射向混合气流时产生的速度矢量偏移扩大了点火面积,从而使点火效率得到提高;氢气、空气燃烧的燃烧产物主要是水,燃烧区域局部温度主要受局部放热反应的影响。
In order to study the plasma ignition process of supersonic mixed gas flow, a three-dimensional calculation model of supersonic combustion chamber was designed and verified. The flow field parameters and chemical reaction rules of the plasma were calculated. The effects of plasma ignition on the combustion The impact of indoor combustion. The calculation results show that the stagnation of the high temperature plasma jet increases the ignition efficiency by increasing the residence time of the mixed gas in the combustion chamber; the pressure diffusion in the combustion area is relatively sufficient when the plasma is ignited, and the flow is relatively low with a relatively balanced pressure; The velocity vector shift caused when the jet impinges on the mixed gas flow at high speed increases the ignition area and improves the ignition efficiency. The hydrogen and air combustion products are mainly water, and the local temperature in the combustion area is mainly affected by the local exothermic reaction.