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Effect of heat release rate and exhaust vent settings on the occurrence of plug-holing during tunnel fires with two-point extraction ventilation
Tunnelling and Underground Space Technology ( IF 6.9 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.tust.2020.103617
Peng Zhao , Zhongyuan Yuan , Nanyang Yu , Chenchen Liang

Abstract This paper investigated the plug-holing phenomenon in the tunnel fire with two-point extraction ventilation based on a reduced-scale tunnel model. The effect of the heat release rate (HRR) and extraction vent settings, i.e. the area and aspect ratio (a ratio of the width to the length), on the occurrence of plug-holing was addressed experimentally and theoretically. Experimental results show that the exhaust volumetric flow rate of the occurrence of plug-holing increases with the growth of the HRR and aspect ratio. Besides, with the extraction vent area rising, the exhaust volumetric flow rate of plug-holing improves. However, when the extraction vent area is larger than a certain value, the hot smoke cannot fill the entire extraction vent and may adhere to the upstream of the extraction vent, which is different from the plug-holing. Finally, an empirical equation was developed to predict the occurrence of plug-holing with various HRRs and extraction vent settings based on a proposed modified Froude number in this paper. Research outcomes can provide constructive references for the current design of the point extraction ventilation in tunnel fires.

中文翻译:

热释放率和排气口设置对两点抽气隧道火灾中塞孔发生的影响

摘要 本文基于缩比隧道模型研究了两点抽气通风隧道火灾中的塞孔现象。热释放率 (HRR) 和排气口设置,即面积和纵横比(宽度与长度的比率)对塞孔发生的影响在实验和理论上得到解决。实验结果表明,随着HRR和纵横比的增加,发生堵塞的排气体积流量增加。此外,随着排气口面积的增加,塞孔排气体积流量提高。但是,当排风口面积大于一定值时,热烟无法充满整个排风口,可能会附着在排风口的上游,这与堵孔不同。最后,基于本文中提出的修正弗劳德数,开发了一个经验方程来预测具有各种 HRR 和抽气口设置的堵塞的发生。研究成果可为当前隧道火灾点排风通风设计提供建设性参考。
更新日期:2020-12-01
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