THERMAL SCIENCE

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Minggao Chen

,

Jun Mao

,

Yanhong Xi

ANALYSIS OF FLOW STRUCTURE OF TUNNEL FIRE BASED ON MODAL DECOMPOSITION

ABSTRACT
In order to study the large scale flow structure of fire smoke in tunnels, this paper uses the excellent ability of proper orthogonal decomposition for the first time to extract flow field structure, processes the flow field data obtained from numerical simulation, obtains the 2-D and 3-D large-scale flow structure of fire smoke in tunnels and analyzes it. The proper orthogonal decomposition of temperature and velocity pulsation field shows that the proportion of first-order modal energy in temperature field is much higher than that in velocity field, indicating that the flow structure of velocity field is more complex than that of temperature field. Through modal phase analysis and modal decomposition of 3-D flow field, the influence of mode on fire smoke flow is recognized, and the understanding of tunnel fire smoke flow structure is deepened. The low-order mode is closely related to smoke flow. The increase of fire power has little effect on the reconstruction of flow field, and the cross-section energy recovery ratio near the fire source is higher under the same fire power.
KEYWORDS
Proper orthogonal decomposition, tunnel fire, Modal decomposition, flow structure
PAPER SUBMITTED: 2021-12-04
PAPER REVISED: 2022-05-20
PAPER ACCEPTED: 2022-05-30
PUBLISHED ONLINE: 2022-08-13
DOI REFERENCE: https://doi.org/10.2298/TSCI211204107C
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 6, PAGES [5027 - 5041]
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Analysis of flow structure of tunnel fire based on modal decomposition

© 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