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为进一步深入研究气-气掺混燃烧机理,在带可视化窗口的透明燃烧室中,采用高速摄影仪和数码相机获得了同轴剪切喷嘴、同轴双剪切喷嘴和旋流喷嘴近喷嘴区域的气氢/气氧燃烧火焰结构。结果表明:剪切式喷嘴火焰始于氧喷嘴出口端面,燃烧主要发生在气-气掺混剪切层当中,同轴双剪切喷嘴在出口形成两个剪切燃烧面;与剪切式喷嘴相比,旋流式喷嘴近喷嘴区域燃烧更加剧烈,当旋流数足够大时,将在中心形成稳定的燃烧回流区。
In order to further study the gas-air blending combustion mechanism, coaxial shearing nozzles, coaxial double-shearing nozzles and swirl nozzle near-nozzle regions were obtained using a high-speed camera and a digital camera in a transparent combustion chamber with a visualization window Gas hydrogen / oxygen combustion flame structure. The results show that the shear nozzle flame begins at the exit end of the oxygen nozzle and the combustion takes place mainly in the gas-air mixing shear layer. The coaxial double-shear nozzle forms two shear combustion surfaces at the outlet. In contrast, swirler nozzles burn more intensely near the nozzle area, and when the swirl number is large enough, a stable combustion recirculation zone will form at the center.