点火源引燃的上坡火蔓延实验研究
|
摘要
开展了点火源引燃的上坡火蔓延实验,用刨花丝为燃料,研究不同坡度角对火蔓延速率、火线夹角、火焰长度、火焰倾斜角等的影响规律,并简要分析了火焰对火前未燃燃料的辐射传热。发现平坡条件下会形成圆形火线,而坡度条件下会形成泪滴状的火线。当坡度角高于20°时,上坡火蔓延速率随坡度的增大迅速上升。
A series of upslope fire spread experiments were performed with point ignition.The excelsior was used as the fuels.The effects of slope angle on rate of spread,fire line angle,flame length and flame tilt angle were studied.The flame radiation on unburnt fuel bed was discussed.It was observed that the fire line was circular for zero slope condition,while it was in tear shape for slope conditions.When slope angle exceeded 20°,the rate of spread rate accelerated quickly with increasing slope angle.
A series of upslope fire spread experiments were performed with point ignition.The excelsior was used as the fuels.The effects of slope angle on rate of spread,fire line angle,flame length and flame tilt angle were studied.The flame radiation on unburnt fuel bed was discussed.It was observed that the fire line was circular for zero slope condition,while it was in tear shape for slope conditions.When slope angle exceeded 20°,the rate of spread rate accelerated quickly with increasing slope angle.
引文
[1]邵占杰,林其钊,路长.基于燃料床的小坡度地表火蔓延模型研究[J].燃烧科学与技术,2003,9(3):219-223.
[2]Fons WL.Analysis of fire spread in light forest fuels[J].Journal of Agricultural Research,1946,72(3):93-121.
[3]Viegas DX.Forest fire propagation[J].Philosophical Transactions-Mathematical Physical and Engineering Sciences,1998,356(1748):2907-2928.
[4]Morandini F,Santoni PA,Balbi JH.Fire front width effects on fire spread across a laboratory scale sloping fuel bed[J].Combustion Science and Technology,2001,166(1):67-90.
[5]Weber RO.Analytical models for fire spread due to radiation[J].Combustion and Flame,1989,78(3-4):398-408.
[6]McAlpine RS,Wakimoto RH.The acceleration of fire from point source to equilibrium spread[J].Forest Science,1991,37(5):1314-1337.
[7]Cheney NP,Gould JS.Fire growth in grassland fuels[J].International Journal of Wildland Fire,1995,5(4):237-247.
[8]Balbi JH,Santoni PA,Dupuy JL.Dynamic modelling of fire spread across a fuel bed[J].International Journal of Wildland Fire,1999,9(4):275-284.
[9]Simeoni A,Santoni PA,Balbi JH.A strategy to elaborate forest fire spread models for management tools including a computer time-saving algorithm[J].International Journal of Modelling and Simulation,2002,22(4):213-224.
[10]Oliveras I,Pi1ol J,Viegas DX.Generalization of the fire line rotation model to curved fire lines[J].International Journal of Wildland Fire,2006,15(4):447-456.
[11]Silvani X,Morandini F,Dupuy JL.Effects of slope on fire spread observed through video images and multiplepoint thermal measurements[J].Experimental Thermal and Fluid Science,2012,41:99-111.
[2]Fons WL.Analysis of fire spread in light forest fuels[J].Journal of Agricultural Research,1946,72(3):93-121.
[3]Viegas DX.Forest fire propagation[J].Philosophical Transactions-Mathematical Physical and Engineering Sciences,1998,356(1748):2907-2928.
[4]Morandini F,Santoni PA,Balbi JH.Fire front width effects on fire spread across a laboratory scale sloping fuel bed[J].Combustion Science and Technology,2001,166(1):67-90.
[5]Weber RO.Analytical models for fire spread due to radiation[J].Combustion and Flame,1989,78(3-4):398-408.
[6]McAlpine RS,Wakimoto RH.The acceleration of fire from point source to equilibrium spread[J].Forest Science,1991,37(5):1314-1337.
[7]Cheney NP,Gould JS.Fire growth in grassland fuels[J].International Journal of Wildland Fire,1995,5(4):237-247.
[8]Balbi JH,Santoni PA,Dupuy JL.Dynamic modelling of fire spread across a fuel bed[J].International Journal of Wildland Fire,1999,9(4):275-284.
[9]Simeoni A,Santoni PA,Balbi JH.A strategy to elaborate forest fire spread models for management tools including a computer time-saving algorithm[J].International Journal of Modelling and Simulation,2002,22(4):213-224.
[10]Oliveras I,Pi1ol J,Viegas DX.Generalization of the fire line rotation model to curved fire lines[J].International Journal of Wildland Fire,2006,15(4):447-456.
[11]Silvani X,Morandini F,Dupuy JL.Effects of slope on fire spread observed through video images and multiplepoint thermal measurements[J].Experimental Thermal and Fluid Science,2012,41:99-111.