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本文论述了用反射激波压缩预混合喷雾柱着火时的燃烧现象。经一元气体动力学理论计算及压力实测,确定了激波管内各区域的气体状态及雾柱着火时的初始条件。根据燃烧火焰幅射能量的现象,对紫外、可视及近红外域的发光作分光观测、离子电流检测、以及燃烧现象的高速摄影观察。研究结果表明,着火起源于喷雾柱中稀薄燃料蒸气的初期氧化反应,进而形成有可视光的兰焰,说明了着火过程的阶段性。着火现象不仅受温度控制,而且受气体流动及混合的影响。
This article discusses the combustion phenomena when a shock wave is used to compress a pre-mixed spray column to ignite it. The gas state in each region of the shock tube and the initial conditions when the fog column is ignited are determined by the theoretical calculation of unary gas dynamics and the actual measurement of pressure. According to the phenomenon of burning flame radiation energy, ultraviolet, visible and near-infrared light emission for spectroscopic observations, ion current detection, and combustion phenomenon of high-speed photography observation. The results show that the ignition originated from the initial oxidation reaction of lean fuel vapor in the spray column, and then formed a blue flame with visible light, indicating the stage of the ignition process. Ignition is not only temperature controlled, but also affected by gas flow and mixing.