狭长受限空间内燃气燃爆灾害演化规律研究
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金友平(1996—),男,硕士研究生。主要从事城镇燃气泄漏后果研究。E-mail:jinyouping2@163.com

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TE88;X932

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国家重点研发计划 (2022YFC3070100);国家自然科学基金 (51806247);中国石油大学(北京)科研基金(2462022YXZZ002)资助


Study on Evolution Law of Gas Explosion Disaster in Narrow and Confined Space
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    摘要:

    为研究狭长受限空间内燃气燃爆灾害的演化规律,采用三维仿真软件 FLACS 分别建立全密闭和半密闭两种受限空间模型,对比研究了两种模型的火焰传播形态,并分析了两种模型在不同工况条件下的燃爆灾害规律。结果表明:两种模型的燃爆火焰形态显著不同;对于全密闭空间,长宽比的增大会促进火焰传播同时增大爆炸压力值的波动性,稍高于化学当量比的甲烷浓度产生的爆炸压力最大,并且富燃爆炸比贫燃爆炸的压力要高;对于半密闭空间,气云体积的增大加大了火焰传播距离的同时也提高了开口端的火焰速度,障碍物数量的增多使爆炸火焰呈现先促进后削弱的现象,并加大了最大爆炸压力和燃爆速度的变化幅度。

    Abstract:

    To study the evolution law of gas combustion and explosion disaster in narrow and long confined space, the three-dimensional simulation software FLACS was used to establish two confined space models, i. e., the fully confined space model and the semi-confined space model, respectively. The flame propagation patterns of the two models were compared, and the flammability and explosion disaster law of the two models under different working conditions was analyzed. The results show that the combustion and explosion flame forms of the two models are significantly different. For fully confined space, the increase of aspect ratio will promote flame propagation and increase the fluctuation of explosion pressure value. The methane concentration slightly higher than the chemical equivalent ratio produces the maximum explosion pressure, and the pressure of rich combustion explosion is higher than that of lean combustion explosion. For semi-confined space, the increase of gas cloud volume increases the flame propagation distance and the flame velocity at the open end. The addition of obstacles initially enhances and then diminishes the intensity of the explosion flame, leading to a broader range of maximum explosion pressures and velocities. The analysis results of this study offer valuable insights for preventing and controling urban gas explosion risks in narrow and long confined spaces.

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金友平,帅健,王旭,张圣柱,王如君,多英全.狭长受限空间内燃气燃爆灾害演化规律研究[J].防灾减灾工程学报,2023,43(6):1366-1376

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  • 收稿日期:2022-06-29
  • 最后修改日期:2022-11-12
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  • 在线发布日期:2024-01-11
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