Comparative study on carbon monoxide stratification and thermal stratification in a horizontal channel fire

Abstract Carbon monoxide (CO) stratification and its relationship with thermal stratification are quite important for dealing with issues related to building fire safety. This experimental study compares the CO stratification and thermal stratification in channel fires. The results show that the relationship between CO stratification and thermal stratification depends on heat loss intensity from smoke flow to walls. In the conditions with considerable amount of heat loss, the vertical gradients of CO volume concentration are smaller than those of temperature rise beneath the ceiling. However, in the conditions with negligible heat loss, the vertical profile of dimensionless CO volume concentration becomes similar with dimensionless temperature rise. The longitudinal ventilation, as a prevailing smoke control or ventilation method, has a strong effect on the relationship between CO stratification and thermal stratification. A larger longitudinal air flow velocity leads to smaller heat loss intensity from smoke flow to walls and thus a higher similarity between CO stratification and thermal stratification.

[1]  Vittorio Verda,et al.  Calculation and design of tunnel ventilation systems using a two- scale modelling Approach , 2009 .

[2]  Haukur Ingason,et al.  The international FORUM of fire research directors: A position paper on future actions for improving road tunnel fire safety , 2006 .

[3]  Olivier Vauquelin,et al.  Definition and experimental evaluation of the smoke "confinement velocity" in tunnel fires , 2005 .

[4]  J. S. Newman,et al.  Flame propagation in ducts , 1983 .

[5]  Haukur Ingason,et al.  Gas temperatures in heavy goods vehicle fires in tunnels , 2005 .

[6]  Craig L. Beyler,et al.  The role of temperature on carbon monoxide production in compartment fires , 1995 .

[7]  Haukur Ingason,et al.  Heat release rates from heavy goods vehicle trailer fires in tunnels , 2005 .

[8]  Michael A. Delichatsios,et al.  The flow of fire gases under a beamed ceiling , 1981 .

[9]  James G. Quintiere,et al.  Scaling applications in fire research , 1989 .

[10]  Dong Yang,et al.  Longitudinal distributions of CO concentration and difference with temperature field in a tunnel fire smoke flow , 2010 .

[11]  Brian Y. Lattimer,et al.  The transport of high concentrations of carbon monoxide to locations remote from the burning compartment , 1996 .

[12]  J. S. Newman,et al.  Experimental evaluation of fire-induced stratification , 1984 .

[13]  W. Jones,et al.  The Effect of Room Openings on Fire Plume Entrainment , 1981 .

[14]  Haukur Ingason,et al.  Model scale tunnel fire tests with longitudinal ventilation , 2010 .

[15]  Won-Hwa Hong,et al.  The Progress And Controlling Situation Of Daegu Subway Fire Disaster , 2004 .

[16]  Alan N. Beard,et al.  The Handbook of Tunnel Fire Safety , 2011 .

[17]  Vytenis Babrauskas,et al.  Fire conditions for smoke toxicity measurement , 1994 .

[18]  Milton Abramowitz,et al.  Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables , 1964 .

[19]  Rex Britter,et al.  CFD simulations of a tunnel fire—Part II , 1996 .

[20]  Frank P. Incropera,et al.  Fundamentals of Heat and Mass Transfer , 1981 .

[21]  Wan Ki Chow,et al.  Decay of Buoyant Smoke Layer Temperature Along the Longitudinal Direction in Tunnel Fires , 2004 .

[22]  R. L. Alpert.  Turbulent Ceiling-Jet Induced by Large-Scale Fires , 1975 .

[23]  Didier Lacroix,et al.  FIRE AND SMOKE CONTROL IN ROAD TUNNELS. , 1998 .

[24]  Indrek S. Wichman,et al.  Material flammability, combustion, toxicity and fire hazard in transportation , 2003 .

[25]  R. Huo,et al.  Experimental study on buoyant flow stratification induced by a fire in a horizontal channel , 2010 .

[26]  Hong Sun Ryou,et al.  A numerical study on smoke movement in longitudinal ventilation tunnel fires for different aspect ratio , 2006 .

[27]  R. Huo,et al.  Experimental studies on fire-induced buoyant smoke temperature distribution along tunnel ceiling , 2007 .

[28]  Richard Carvel,et al.  A History of Fire Incidents in Tunnels , 2005 .