도로터널 화재시의 환기분석

The Analysis of Ventilation of Road Tunnel in Fire

  • 김성준 (강원대학교 기계메카트로닉스공학부) ;
  • 류진웅 (강원대학교 공학대학 기계메카트로닉스공학부)
  • 발행 : 2003.08.31

초록

Numerical experiments are done by a commercial code, PHOENICS to evaluate the backlayer phenomenon of smoke in case of the road tunnel fire. The independent and dependent variables are ventilation air velocity and the length of backlayer of smoke respectively. Hybrid scheme and ${\kappa}-{\varepsilon}$ turbulence model are adopted in the simulation process and mass residual is used as a convergence criterion. The experimental results say that the length of backlayer is reduced with the increase of ventilating air velocity and that there is a critical air velocity which prevents from the onset of backlayering phenomena. One finds that there is a fresh air region near the bottom of tunnel which could make the passenger escape safely from the polluted region by smoke. These phenomena come from the vertical stratification of the smoke air mixture in the tunnel.

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