Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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An Experimental Study on the Effect of Ventilation Velocity on the Burning Rate in Longitudinal Ventilation Tunnel Fires

종류식 배연 터널 화재시 배연속도가 연소율에 미치는 영향에 대한 실험적 연구

  • 양승신 (중앙대학교 기계공학부 대학원) ;
  • 유흥선 (중앙대학교 기계공학부) ;
  • 최영기 (중앙대학교 기계공학부) ;
  • 김동현 (한국철도기술연구원)
  • Published : 2005.10.01
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Abstract

In this study, the 1/20 reduced-scale experiment using Froude scaling were conducted to investigate the effect of longitudinal ventilation velocity on the burning rate in tunnel fires. The methanol pool fires with heat release rate ranging from 2.02 kW to 6.15 kW and the n-heptane pool fires with heat release rate ranging from 2.23 kW to 15.6 kW were used. The burning rate of fuel was obtained by measuring the fuel mass at the load cell. The temperature distributions were observed by K-type thermocouples in order to investigate smoke movement. The ventilation velocity in the tested tunnel was controlled by inverter of the wind tunnel. In methanol pool fire, the increase in ventilation velocity reduces the burning rate. On the contrary in n-heptane pool fire, the increase in ventilation velocity induces large burning rate. The reason for above conflicting phenomena lies on the difference of burning rate. In methanol pool fire, the cooling effect outweighs the supply effect of oxygen to fire plume, and in n-heptane pool vice versa.

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References

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