경사터널내 화재 발생시 경사도가 임계속도에 미치는 영향에 관한 연구

초록

An experimental study has been conducted to investigate the effect of tunnel slope on critical velocity by using the model tunnel of the 1/20 reduced-scale applying the Froude scaling law. the square liquid pool burners were used for methanol, acetone and n-heptane fires. tunnel. Tunnel slopes varied as five different degrees 0°, 2°, 4°, 6° and 8°. The mass loss rate and the temperatures are measured by a load cell and K-type thermocouples for tunnel slope. Present study results in bigger the critical velocity than the research of Atikinson and Wu using the propane burner. Therefore, when estimating the critical velocity in slope tunnel, the variations of the heat release rate is an important factor. The reason is the ventilation velocity directly affects variation of heat release rate when slope tunnel fire occurred.

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