Experimental study on inhibition effect of inert gas parameters on gas deflagration flame propagation
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摘要:
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%。
Abstract: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.
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图 4 9.5%甲烷/空气预混气体火焰信号图
Figure 4. Flame front propagation diagram of 9.5% methane/air premixed gas
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图 6 远点火端喷射N2火焰阵面传播过程
Figure 6. Propagation process of N2 flame front far away from ignition
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图 7 喷射压力为3.5 MPa N2的火焰信号
Figure 7. Flame signal with nitrogen injection pressure of 3.5 MPa
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图 8 不同位置喷射N2的火焰传播速度
Figure 8. Flame propagation velocity of N2 injection at different positions
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图 9 喷射0 MPa N2的纹影图像（无N2）
Figure 9. Schlieren images of nitrogen at injection pressure of 0 MPa (no nitrogen)
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图 10 靠近点火端喷射0.5 MPa N2的纹影图像
Figure 10. Schlieren images of 0.5 MPa N2 injection near ignition end
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图 11 靠近点火端喷射1.5 MPa N2的纹影图像
Figure 11. Schlieren images of 1.5 MPa N2 injection near ignition end
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图 12 靠近点火端喷射2.5 MPa N2的纹影图像
Figure 12. Schlieren image of 2.5 MPa N2 injection near ignition end
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图 13 靠近点火端喷射3.5 MPa N2的纹影图像
Figure 13. Schlieren images of 0.5 MPa N2 injection near ignition end
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图 14 远离点火端喷射3.5 MPa N2的纹影图像
Figure 14. Schlieren images of nitrogen injected at a pressure of 3.5 MPa away from ignition end
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图 15 近点火端喷射CO2火焰阵面传播过程
Figure 15. Propagation process of CO2 flame front near ignition
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图 16 远点火端喷射CO2火焰阵面传播过程
Figure 16. Propagation process of CO2 flame front far away from ignition
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图 17 不同喷射压力下火焰的传播速度
Figure 17. Flame propagation velocity under different injection pressures
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图 18 靠近点火端喷射压力为3.5 MPa的CO2
Figure 18. Schlieren images of carbon dioxide injected at a pressure of 3.5 MPa near ignition end
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图 19 远离点火端喷射压力为3.5 MPa的CO2
Figure 19. Schlieren images of carbon dioxide injected at a pressure of 3.5 MPa away from ignition end
表 1 火焰传感器距点火端的位置
Table 1 Position of flame sensors from ignition end
火焰传感器 距点火端距离/m F1 2.03 F2 4.53 F3 7.03 F4 8.53 F5 9.03 F6 10.53 F7 13.03 F8 15.53 
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表 2 实验工况设计
Table 2 Design of experimental conditions
实验组 气体喷射压力/MPa 喷射口位置 1 0.5 近点火端 2 0.5 远点火端 3 1.5 近点火端 4 1.5 远点火端 5 2.5 近点火端 6 2.5 远点火端 7 3.5 近点火端 8 3.5 远点火端
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