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Underground gas pipeline explosion and fire: CFD based assessment of foreseeability

机译:地下天然气管道爆炸和火灾:基于CFD的可预见性评估

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摘要

Scenarios of underground gas pipeline failure, crater formation, dispersion of gas, explosion and subsequent fires are investigated with semi-empirical and with CFD (Computational Fluid Dynamics) modelling. In order to strengthen the accident based learning approaches present investigations are performed in the context of recent GAIL (Gas Authority of India Limited) natural gas pipeline incident occurred in India. The foreseeability of damages to lives of people and assets due to explosion over-pressure and thermal radiation are assessed. The released gas is considered as slightly dense-than-air i.e. 1.5 times. Depending on the LFL (Lower Flammability Limit) of gas the dispersion diameter and heights are predicted which followed the visual evidences appropriately. The model was furthermore tested with an even denser medium and was found to be worked well there too. The estimated explosion over-pressures with the standard methods and also with CFD reproduced the scenario nicely. The effects of congestion VBR (Volume Blockage Ratio) in form of vegetation on stable atmospheric boundary layer flow is analysed and its contribution towards turbulence and hazard enhancement is studied.
机译:使用半经验模型和CFD(计算流体动力学)模型研究了地下天然气管道故障,火山口形成,气体扩散,爆炸和随后发生的火灾的情况。为了加强基于事故的学习方法,目前的调查是在最近发生在印度的GAIL(印度天然气管理局有限公司)天然气管道事件中进行的。评估了由于爆炸超压和热辐射而造成的人员和财产损失的可预见性。释放的气体被认为是比空气稍微稠密的气体,即1.5倍。根据气体的LFL(可燃性下限),可以预测分散体的直径和高度,并适当遵循视觉证据。此外,该模型还使用更密实的介质进行了测试,发现在该模型中也能很好地工作。使用标准方法以及CFD估算的爆炸超压很好地再现了这种情况。分析了植被形式的拥塞VBR(体积阻塞比)对稳定的大气边界层流动的影响,并研究了其对湍流和危害增强的贡献。

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