开放空间预混甲烷-空气云与建筑物的爆燃效应

IF 3.4
Jiashuai Wang, , , Xu Wang, , , Shengzhu Zhang*, , , Yuntao Li, , , Jie Zhang, , , Dengfeng Zheng, , and , Yanan You, 
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引用次数: 0

摘要

为了研究甲烷预混气云爆燃的后果,我们开发了天然气爆燃的计算流体动力学(CFD)模型。在进行大型管道爆炸实验验证之前,研究了气体云特征参数和建筑物存在对爆燃火球热辐射和超压的影响。结果表明:当当量比小于1.4时,开间爆燃产生的外超压增大;同面积圆形云的热辐射增长率和超压增幅比方形云高10%;非均匀气体分布减少了热辐射(大小取决于非均质性);正面辐射在泄漏点150米范围内超过致死限度;建筑物具有显著的屏蔽作用,确保200米以上的安全;建筑高度的增加加速了表面热衰减;屋顶处于热衰减过渡区,衰减率随高度增加而加剧。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Deflagration Effects of Premixed Methane–Air Cloud with Buildings in Open Space

The Deflagration Effects of Premixed Methane–Air Cloud with Buildings in Open Space

To investigate methane-premixed gas cloud deflagration consequences, we developed a computational fluid dynamics (CFD) model for natural gas deflagration. Validation against large-scale pipeline explosion experiments preceded the examination of characteristic parameters of gas cloud and building presence effects on deflagration fireball thermal radiation and overpressure. Results indicate that open-space deflagration yields increasing external overpressure with equivalence ratios below 1.4; identical-area circular clouds exhibit 10% higher thermal radiation growth rates and greater overpressure increases than square counterparts; nonuniform gas distribution reduces thermal radiation (magnitude dependent on heterogeneity); frontal radiation exceeds lethal limits within 150 m of leakage points; buildings confer significant shielding, establishing safety beyond 200 m; increased building height accelerates surface thermal attenuation; rooftops occupy thermal decay transition zones where attenuation rates intensify with height.

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