Experimental study on vertical temperature distribution characteristics between double fire sources in tunnel
YUAN Heyong
WU Zhihui
DING Fan
Abstract：In order to explore the vertical temperature distribution characteristics in the region between double fire sources in a naturally ventilated tunnel,a series of tunnel fire experiments were conducted using a 1:10 scale tunnel model.The experiments focused on investigating the influence of fire source size and spacing on the vertical temperature distribution between the fire sources.The results show that with the increase of the distance from the ceiling height,the vertical temperature between the fire sources gradually decreases,and the vertical temperature between the fire sources begins to stabilize after the distance from the ceiling height rea-ches a certain value.With the increase of the distance between fire sources,the thermal radiation effect on the area between fire sources decreases,so the vertical temperature between fire sources decreases rapidly.The McCaffrey model can accurately predict the vertical temperature distribution at the upper part of the flame mer-ging point when the flame is completely merged and when the flame is not completely merged.Through dimen-sional analysis and experimental data fitting,a piecewise expression of the vertical temperature distribution at the lower part of the flame merging point is established,which can accurately predict the vertical temperature distribution at the lower part of the flame merging point when the flame is not completely merged.
Keywords：naturally ventilated tunneltwo fire sourcesvertical temperature distributionfire source sizefire source spacing
Publication Date：2024-10-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 65-72 )