Abstract
The effects of orientation on flame spread over the upper surface of PMMA and PE slabs were studied through a series of experiments. For fuel inclined angles smaller than 75° in this study, flame spread would arrive a steady-state stage finally. The flame spread rate and the angle of the fire plume near pyrolysis front in the steady-state stage were measured to investigate the differences between flame spread over melting and non-melting solids. Compared to the flame spread over polymethyl methacrylate (PMMA), the melting behaviors of high density polyethylene (PE) significantly decrease the flame spread rate, which is mainly attributed to the decreased size of fire plume and reduced interactions between fire plume and solid surface. The angles of the fire plume in the steady-state stage under different fuel inclined angles were measured to better understand the melting effects on flame spread over the inclined solid surface.
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