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http://dx.doi.org/10.9711/KTAJ.2013.15.3.289

A numerical study on the characteristics of the smoke movement and the effects of structure in road tunnel fire  

Yoo, Ji-Oh (Dept of Building Mech. Sys. Eng., Shinhung College)
Oh, Byung-Chil (Dept of Building Mech. Sys. Eng., Shinhung College)
Kim, Hyo-Gyu (Jusung G&B Inc.)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.15, no.3, 2013 , pp. 289-300 More about this Journal
Abstract
This study numerically considered the characteristic of smoke movement and the effect of hot smoke gas on tunnel wall surface temperature during road tunnel fire under boundary condition of fire growth curve that is applied to fire analysis in road tunnels. The maximum heat release rate were 20 MW and 100 MW and tunnel air velocities were 2.5 m/s and velocity induced by thermal buoyancy respectively, also the cooling effect of tunnel wall was considered. As results, when tunnel air velocity was constant at 2.5 m/s during tunnel fire, due to the cooling effect of tunnel wall, the smoke layer was rapidly descent after some distance and it flowed the same patterns at the downstream. When heat release rate was 100 MW (and jet fan was not installed), the maximum temperature of tunnel wall surface has risen up to $615^{\circ}C$. The heat transfer coefficient of tunnel wall surface was varied from 13 to $23W/m^2^{\circ}C$ approximately.
Keywords
Road tunnel fire; Smoke propagation; Structural fire resistance;
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