In the description of the characteristic volume of fire behavior,fire intensity I<sub>r</sub>ate of spread R,and flame length L,etc.all have their scientific definitions,while the bound be-tween the fireli...In the description of the characteristic volume of fire behavior,fire intensity I<sub>r</sub>ate of spread R,and flame length L,etc.all have their scientific definitions,while the bound be-tween the fireline and the residual region of a fire scene is not yet scientifically defined.This pa-per tries to find out theoretically the basis for dividing the bound,to give the fireline thickness D a scientific definition,and to propose a method of quantitative calculation.According to the generality of fuels,the time-dependent curves of fuels combustion rate are utilized to work out a formula by experience.On the basis of defining scientifically the fireline thickness,the Byram’s formula is corrected,and a new one for calculating the fire intensity of slurface fire,i.e.I=0.788HWr,is presented.In this formula,H is the fuel low heat of combustion,the calculating method of the thermal cuyrrent intensity j is given,and J<sub>max</sub>=1.25HWR/D,the calculating formula of flame length is revised,and L=0.0775I<sup>0.46</sup>. In the展开更多
文摘In the description of the characteristic volume of fire behavior,fire intensity I<sub>r</sub>ate of spread R,and flame length L,etc.all have their scientific definitions,while the bound be-tween the fireline and the residual region of a fire scene is not yet scientifically defined.This pa-per tries to find out theoretically the basis for dividing the bound,to give the fireline thickness D a scientific definition,and to propose a method of quantitative calculation.According to the generality of fuels,the time-dependent curves of fuels combustion rate are utilized to work out a formula by experience.On the basis of defining scientifically the fireline thickness,the Byram’s formula is corrected,and a new one for calculating the fire intensity of slurface fire,i.e.I=0.788HWr,is presented.In this formula,H is the fuel low heat of combustion,the calculating method of the thermal cuyrrent intensity j is given,and J<sub>max</sub>=1.25HWR/D,the calculating formula of flame length is revised,and L=0.0775I<sup>0.46</sup>. In the
