在自主搭建的中尺度爆炸管道上，构建超高速激光纹影测试系统，探究不同喷射位置和压力下N₂和CO₂抑制瓦斯/空气预混气体爆燃火焰传播特性。结果表明：在惰性气体抑制瓦斯/空气预混气体爆燃实验中，随着喷射压力的逐步增强，火焰传播速度呈现出先增大后减小的趋势，火焰形态也由指尖状逐渐拉伸变形，中部突出部分变小直至呈现近平面状；近点火端喷射CO₂时比远离点火端喷射的最高火焰传播速度降低20.79%，喷射N₂时降低20.25%，近点火端喷射CO₂比远点火端的最低火焰速度低9.68%，喷射N₂时降低12.86%；对比2种阻燃抑爆气体，近点火端喷射CO₂比喷射N₂的最高火焰传播速度低21.78%，最低速度比N₂低1.82%；远点火端喷射CO₂时的最高火焰速度比N₂低21.25%，最低火焰速度比N₂低5.27%。

In this paper, we continue to build an ultra-high speed laser schlieren testing system on the self-developed mesoscale explosion pipeline to explore the flame propagation characteristics of nitrogen and carbon dioxide inhibiting gas/air premixed gas deflagration under different injection positions and pressures. The results show that: in the experiment of inert gas inhibiting gas/air premixed gas deflagration, with the gradual increase of injection pressure, the flame propagation speed shows a trend of first increasing and then decreasing, the flame shape also gradually stretches and deforms from fingertip shape, and the middle protruding part becomes smaller until it is nearly flat; the maximum flame propagation speed of CO₂ injection near the ignition end is 20.79% lower than that of N₂ injection far away from the ignition end, and 20.25% lower than that of N₂ injection; when CO₂ is injected far from the ignition end, the minimum flame speed is 9.68% lower than that of CO₂ injection, and 12.86% lower than that of N₂ injection; compared with the two kinds of flame retarding and explosion inhibition gases, the highest flame propagation speed of CO₂ sprayed near the ignition end is 21.78% lower than that of N₂, and the lowest flame propagation speed is 1.82% lower than that of N₂. The highest flame velocity and the lowest flame velocity are 21.25% and 5.27% lower than N₂ when CO₂ is sprayed at the far ignition end.