Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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An Experimental Study of Smoke Movement in Tunnel Fire with Natural and Forced Ventilations

자연 및 강제 배기시의 터널 내 연기거동에 관한 실험적 연구

  • 황철홍 (인하대학교 대학원 기계공학과) ;
  • 유병훈 (인하대학교 대학원 기계공학과) ;
  • 금성민 (한라대학교 기계자동차공학부) ;
  • 김정엽 (한국건설기술연구원, 화재설비연구부) ;
  • 신현준 (한국건설기술연구원, 화재설비연구부) ;
  • 이창언 (인하대학교 기계공학과)
  • Published : 2005.06.01
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Abstract

In order to design of emergency ventilation systems, the smoke movements in tunnel fire with natural and forced ventilation were investigated. Reduced-scale experiments were carried out under the Froude scaling with novel fire source consisting many wicks. Temperature profiles were measured under the ceiling and vertical direction along the center of the tunnel and poisonous gases were measured at emergency exit point in the natural ventilation case. In forced ventilation, temperature profiles were measured with various flow rate to obtain critical velocity. The results showed that the interval of emergency exit having 225m was estimated reasonably through the measurements of temperature variation and poisonous gas in the natural ventilation. In the case of forced ventilation, the temperature distribution near fire source is remarkably different from that of natural ventilation. Also, the critical velocity to prevent upstream smoke flow has the range of 0.57m/s between 0.64m/s. Finally, it was also identified that although the increase of flow rate can suppress the backward flow of smoke to upstream direction, brings about the increase of flame intensity near stoichiometric fuel/air ratio.

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References

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