The Effect of Thickness on Plywood Vertical Fire Spread

In order to study the effect of plywood's thickness on vertical fire spread, small-sized experiment is conducted to study flame front position, pyrolysis front position and burnout front position at the thickness of 2,3,6 mm respectively. Through the effect of sample thickness on flame spread rate, flame height and pyrolysis height are analyzed, the experimental results show that the thickness has obvious influences on the process of the plywood vertical fire spread. Flame front position, pyrolysis front position and burnout front position, those three increases with the decrease on the sample thickness, which is consistent with the trend of flame spread rate with thickness. In the process of vertical combustion, flame height and pyrolysis height aren't stable figures, but the change with time shows that the figures increase firstly and then stabilize. Flame height and pyrolysis height increase with the decrease of specimen's thickness.