Study on the effect of width and slope of large cross-section tunnel on critical velocity of fire

IF 1.1 4区工程技术 Q4 THERMODYNAMICS

Thermal Science Pub Date : 2023-01-01 DOI:10.2298/tsci230328195s

Su Liu

引用次数: 0

Abstract

when a tunnel fire occurs, due to the difference of tunnel width and slope, both smoke countercurrent length distribution law and critical velocity will become different, and these two are very important parameters in tunnel longitudinal ventilation design. Therefore, for the design of smoke control and longitudinal ventilation of the tunnel, based on actual highway tunnel size, this paper established and ran a series of numerical simulations through FDS simulation software to study tunnel width and slope?s effect on smoke countercurrent length and critical velocity. The results of this paper show that smoke countercurrent length decreases with tunnel slope?s increase and increases with tunnel width?s increase. Through dimensionless analysis, the prediction formulas of smoke countercurrent length and critical wind speed of large cross-section tunnel about tunnel width, slope and height are modified and established. The research conclusions can provide a theoretical basis for the longitudinal ventilation design, smoke prevention and exhaust measures and personnel evacuation in large cross-section tunnel fires.

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大断面隧道宽度和坡度对临界火速的影响研究

当隧道发生火灾时，由于隧道宽度和坡度的不同，烟气逆流长度分布规律和临界流速都会有所不同，这两个参数是隧道纵向通风设计中非常重要的参数。因此，对于隧道的防烟和纵向通风设计，本文根据实际公路隧道尺寸，通过FDS仿真软件建立并运行了一系列数值模拟，研究隧道宽度和坡度?S对烟气逆流长度和临界流速的影响。结果表明，烟气逆流长度随隧道坡度的增大而减小。S随隧道宽度增大而增大?年代增加。通过无因次分析，修正并建立了关于隧道宽度、坡度和高度的大断面隧道烟气逆流长度和临界风速的预测公式。研究结论可为大断面隧道火灾纵向通风设计、防排烟措施及人员疏散提供理论依据。

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

Thermal Science 工程技术-热力学

CiteScore

2.70

自引率

29.40%

发文量

399

审稿时长

5 months

期刊介绍： The main aims of Thermal Science to publish papers giving results of the fundamental and applied research in different, but closely connected fields: fluid mechanics (mainly turbulent flows), heat transfer, mass transfer, combustion and chemical processes in single, and specifically in multi-phase and multi-component flows in high-temperature chemically reacting flows processes present in thermal engineering, energy generating or consuming equipment, process and chemical engineering equipment and devices, ecological engineering, The important characteristic of the journal is the orientation to the fundamental results of the investigations of different physical and chemical processes, always jointly present in real conditions, and their mutual influence. To publish papers written by experts from different fields: mechanical engineering, chemical engineering, fluid dynamics, thermodynamics and related fields. To inform international scientific community about the recent, and most prominent fundamental results achieved in the South-East European region, and particularly in Serbia, and - vice versa - to inform the scientific community from South-East European Region about recent fundamental and applied scientific achievements in developed countries, serving as a basis for technology development. To achieve international standards of the published papers, by the engagement of experts from different countries in the International Advisory board.