Experimental Study on the Influence of High-Pressure Water Mist on the Ceiling Temperature of a Longitudinally Ventilated Tunnel

Fire Pub Date : 2024-07-23 DOI:10.3390/fire7080262

Hui Zhu, Weining Du, Wenfeng Li

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Abstract

In this study, a tunnel model with a length of 20 m, a width of 5 m, and a height of 5 m was used, and an experimental investigation was conducted to examine the impact of high-pressure water mist on the temperature distribution along the tunnel ceiling. Specifically, different experimental settings, such as various nozzle pressures, nozzle positions, and longitudinal ventilation speeds, in the high-pressure water mist system were employed to investigate the smoke-spreading process of tunnel fire under different conditions, and an effective method utilizing a high-pressure water mist system was proposed for blocking smoke and heat. The experimental results reveal that the high-pressure water mist system can be used to effectively improve the ceiling temperature during tunnel fires; when the nozzle pressure is set as 10 MPa, and the nozzle position is located at x7, the highest thermal insulation efficiency in the tunnel is obtained. Additionally, the joint application of the high-pressure water mist system and the mechanical smoke exhaust effectively mitigates the ambient temperature within the tunnel, thereby playing a pivotal role in enhancing the fire safety of the tunnel.

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高压水雾对纵向通风隧道顶温影响的实验研究

本研究使用了一个长 20 米、宽 5 米、高 5 米的隧道模型，并通过实验研究了高压水雾对隧道顶棚沿线温度分布的影响。具体而言，通过对高压水雾系统进行不同的实验设置，如不同的喷嘴压力、喷嘴位置和纵向通风速度，研究了不同条件下隧道火灾的烟雾扩散过程，并提出了利用高压水雾系统阻隔烟雾和热量的有效方法。实验结果表明，利用高压水雾系统可以有效提高隧道火灾时的顶棚温度；当喷嘴压力设定为 10 兆帕，喷嘴位置位于 x7 时，隧道内的隔热效率最高。此外，高压水雾系统和机械排烟的联合应用，有效缓解了隧道内的环境温度，对提高隧道的消防安全起到了关键作用。

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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Fire

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