Influence of Gas Concentration on Flame Spread Range Generated from Indoor Deflagration of Natural Gas
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摘要: 高温火焰峰面是室内燃气爆燃事故中最主要的致害因素之一，火焰峰面的波及范围在很大程度上反映了事故的危险区域及事故的严重性。借助计算流体力学技术，结合某室内燃气泄漏爆燃事故，对不同燃气浓度下室内燃气爆燃过程，尤其是火焰波及范围，进行了深入研究。研究结果表明，燃气浓度对火焰波及范围有显著影响，浓度越大，火焰波及范围越大。这是由于在富含燃料而氧气不足的条件下，大量未燃燃料在前导冲击波和湍流作用下进一步运移和扩散，加剧了火焰的进一步延伸，从而导致火焰区的扩大。Abstract: Flame front with high temperature is one of the most main hazardous factors during indoor deflagration accidents of natural gas.Spread range of flame front reflects the hazardous region and the severity of this kind of accidents in a great degree.Combined with one indoor natural gas deflagration accident, the indoor natural gas deflagration processes under different gas concentrations, especially the spread range of flame, were studied deeply by virtue of computational fluid dynamics technology.The results show that gas concentration takes great influence on spread range of flame.The higher the gas concentration, the greater the spread range of flame.The reason of the above conclusions is that the movement and diffusion of unburned fuel induced by precursor shockwave and turbulence promote further spread of flame and enlargement of flame region.
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Key words:
- natural gas /
- deflagration /
- shock wave /
- flame propagation /
- diffusion
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图 2 不同甲烷浓度时各观测点的峰值超压
Figure 2. Peak overpressure on observation points under different concentrations of methane
图 3 不同甲烷浓度时外门附近冲击波超压随时间的变化
Figure 3. Shockwave overpressure versus time near outer door under different concentrations of methane
图 4 不同甲烷浓度条件下内门附近燃烧率随时间的变化
Figure 4. Combustion rate versus time near inner door under different concentrations of methane
图 5 不同甲烷浓度条件下外门附近燃烧率随时间的变化
Figure 5. Combustion rate versus time near outer door under different concentrations of methane
图 6 不同甲烷浓度条件下内门附近甲烷质量分数随时间的变化
Figure 6. Mass fraction of methane versus time near inner door under different concentrations of methane
图 7 不同甲烷浓度条件下外门附近甲烷质量分数随时间的变化
Figure 7. Mass fraction of methane versus time near outer door under different concentrations of methane
图 8 不同甲烷浓度条件下内门附近温度随时间的变化
Figure 8. Temperature versus time near inner door under different concentrations of methane
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