Influence of the train running on the fire smoke spread characteristics in the rescue station

IF 1.1 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

International Journal of Ventilation Pub Date : 2021-11-23 DOI:10.1080/14733315.2021.2004662

Yuanlong Zhou, Honglin Wang, Haiquan Bi

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引用次数: 3

Abstract

Abstract Rescue station is an important part of the extra-long railway tunnel, which can provide smoke-free refuge for evacuated passengers. For the fire research of the rescue station, the influence of the burning train running on the smoke spread characteristics has not been considered in the previous studies. In this work, the influence of the train running on the fire smoke spread characteristics in the rescue station was investigated using the numerical method, and the accuracy of the numerical methodology was confirmed by the 1:20 scale model experiment. Then, the influence of the burning train running on the temperature and visibility distribution in the rescue station was analysed by dynamic and static simulation. The results demonstrate that the temperature and soot density of the smoke are low when the burning train was running in the tunnel, which makes fire detection very difficult. For the smoke spread characteristics of the rescue station, the main impact of the burning train running is visibility, and the influence time is 30 s when the heat release rate of the fire source was 15 MW. For dynamic simulation, when the burning train stops at the rescue station, the maximum heat transfer power between the smoke at the top of the tunnel and the concrete lining is 1.51 MW, accounting for 10.1% of the heat release rate of the fire source.

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列车运行对救援站火灾烟气蔓延特性的影响

摘要救援站是超长铁路隧道的重要组成部分，可以为被疏散的旅客提供无烟避难场所。对于救援车站的火灾研究，以往的研究没有考虑燃烧列车运行对烟雾蔓延特性的影响。本文采用数值方法研究了列车运行对救援站火灾烟气蔓延特性的影响，并通过1:20比例模型试验验证了数值方法的准确性。然后，通过动、静态仿真分析了燃烧列车运行对救援站内温度和能见度分布的影响。结果表明:燃烧列车在隧道内运行时，烟气的温度和烟灰密度较低，这给火灾探测带来了很大的困难。对于救援站的烟雾蔓延特性，火源放热速率为15 MW时，燃烧列车运行的主要影响因素是能见度，影响时间为30 s。动态模拟时，燃烧列车在救援站停车时，隧道顶部烟气与混凝土衬砌之间的最大换热功率为1.51 MW，占火源放热率的10.1%。

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

International Journal of Ventilation CONSTRUCTION & BUILDING TECHNOLOGY-ENERGY & FUELS

CiteScore

3.50

自引率

6.70%

发文量

审稿时长

>12 weeks

期刊介绍： This is a peer reviewed journal aimed at providing the latest information on research and application. Topics include: • New ideas concerned with the development or application of ventilation; • Validated case studies demonstrating the performance of ventilation strategies; • Information on needs and solutions for specific building types including: offices, dwellings, schools, hospitals, parking garages, urban buildings and recreational buildings etc; • Developments in numerical methods; • Measurement techniques; • Related issues in which the impact of ventilation plays an important role (e.g. the interaction of ventilation with air quality, health and comfort); • Energy issues related to ventilation (e.g. low energy systems, ventilation heating and cooling loss); • Driving forces (weather data, fan performance etc).