Numerical investigation on smoke control with new-style horizontal smoke baffle in an immersed road tunnel

IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Shaogang Zhang, Dongyi Diao, Long Shi, Xudong Cheng, Jiahao Liu, Jianghong Liu, Jinhui Wang, Beihua Cong
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Abstract

To investigate the improvement induced by horizontal smoke baffles during lateral smoke exhaust, an immersed road tunnel with various horizontal smoke baffles positioned below the lateral exhaust vent was studied numerically. Together with the velocity field characteristics, the temperature distribution was investigated near the lateral smoke exhaust vent, followed by the analysis of lateral smoke exhaust efficiency under different horizontal smoke baffles. Results showed that after installing the horizontal smoke baffle, there was a significant decrease in the extracted cold air, while the high-temperature smoke in the exhaust vent increases, indicating the plug-holing is effectively suppressed. It is known that the efficiency of smoke exhaust increases when the length exceedance ratio of the horizontal smoke baffle is smaller than 100%, while it changes slightly when the baffle length continues to increase. When the width ratio of horizontal baffle is smaller than 40%, the efficiency of smoke exhaust increases with the baffle width and then changes slightly with a wider smoke baffle. With a larger aspect ratio, the wider and shorter lateral exhaust vent is beneficial for improving the lateral smoke exhaust. Under the current conditions, the case shows the optimal smoke exhaust performance with a horizontal baffle length exceedance ratio of 100%, a baffle width ratio of 40%, and exhaust vent aspect ratio of 3:1. Finally, an empirical model is developed to describe the improvement of smoke exhaust efficiency caused by horizontal smoke baffle. These outcomes are helpful to the design of lateral smoke extraction system in road tunnels.

采用新型水平挡烟板控制沉管公路隧道内烟雾的数值研究
为了研究水平挡烟板在横向排烟过程中的改善作用,我们对在横向排烟口下方设置了不同水平挡烟板的沉浸式公路隧道进行了数值研究。结合速度场特征,研究了横向排烟口附近的温度分布,然后分析了不同水平挡烟板下的横向排烟效率。结果表明,安装水平挡烟板后,抽出的冷空气明显减少,而排烟口的高温烟雾却有所增加,说明堵塞现象得到了有效抑制。众所周知,当水平挡烟板的长度超出比小于 100%时,排烟效率增加,而当挡板长度继续增加时,排烟效率略有变化。当水平挡烟板的宽度比小于 40% 时,排烟效率随挡烟板宽度的增加而增加,然后随挡烟板宽度的增加而略有变化。长宽比越大,横向排烟口越宽越短,有利于提高横向排烟效果。在当前条件下,当水平挡板长度超出比为 100%、挡板宽度比为 40%、排气孔长宽比为 3:1 时,案例显示出最佳排烟性能。最后,建立了一个经验模型来描述水平挡烟板对排烟效率的改善。这些成果有助于公路隧道横向排烟系统的设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Fire and Materials
Fire and Materials 工程技术-材料科学:综合
CiteScore
4.60
自引率
5.30%
发文量
72
审稿时长
3 months
期刊介绍: Fire and Materials is an international journal for scientific and technological communications directed at the fire properties of materials and the products into which they are made. This covers all aspects of the polymer field and the end uses where polymers find application; the important developments in the fields of natural products - wood and cellulosics; non-polymeric materials - metals and ceramics; as well as the chemistry and industrial applications of fire retardant chemicals. Contributions will be particularly welcomed on heat release; properties of combustion products - smoke opacity, toxicity and corrosivity; modelling and testing.
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