Experimental study on flame strengthening with water mist in tunnel fires

doi:10.16265/j.cnki.issn1003-3033.2017.03.007

Abstract

Abstract: To discuss flame strengthening effect caused by water-mist in diesel pool fire, a 1∶10 water-mist fire fighting experiment platform was established based on Froude rule. By means of small scale model effects of, quantitatively factors,like nozzle pressure and pre-combustion time, on the flame strengthening caused by water-mist were studied. The results show that the main reason for flame strengthening phenomenon is boiling of both the water-mist and the fuel, only when nozzle pressure surpasses a critical value, there will arise the flame strengthening phenomenon,that the flame width and area increase obviously after strengthening effect, while the flame height has a slight decrease,and that the water-mist has three different strengthening effects on flame, which are divided into fast-weak strengthening, discontinuous-moderate strengthening and continuous-intense strengthening, and increasing pre-combustion time promotes, the flame strengthening degree gradually , and makes the fire hazard greater.

Key words: tunnel fire, model experiment, water-mist, flame strengthening effect, Froude rule

CLC Number:

X932

LI Tao, XIE Wei, ZHANG Yuchun, XIAO Han. Experimental study on flame strengthening with water mist in tunnel fires[J]. China Safety Science Journal, 2017, 27(3): 37-41.

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