THERMAL SCIENCE

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Su Liu

STUDY ON THE EFFECT OF WIDTH AND SLOPE OF LARGE CROSS-SECTION TUNNEL ON CRITICAL VELOCITY OF FIRE

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.
KEYWORDS
large cross-section tunnel, fire, tunnel width, tunnel slope, critical velocity
PAPER SUBMITTED: 2023-03-28
PAPER REVISED: 2023-07-10
PAPER ACCEPTED: 2023-08-17
PUBLISHED ONLINE: 2023-10-08
DOI REFERENCE: https://doi.org/10.2298/TSCI230328195S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 2, PAGES [1635 - 1649]
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Study on the effect of width and slope of large cross-section tunnel on critical velocity of fire

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence