Abstract
The influence of oxygen concentration on fuel parameters in pool fires with areas of about 0.007 m 2 and 0.07 m 2 is described for methanol, polyoxymethylene (POM), polymethyl-methacrylate (PMMA), heptane, polypropylene (PP) and polystyrene (PS). Fuel parameters include mass loss rate, combustion efficiency, convective and radiative fractions of heat of complete combustion, and yields of CO 2 , CO, and soot and low-vapor-pressure liquid products. For combustion in excess air, the combustion efficiency and the yield of CO 2 are not very sensitive to changes in m 02 and fuel areas. The fuel mass loss rate, yield of unburnt soot, flame radiative heat flux, and radiative fraction of heat of complete combustion increase and flame convective heat flux and convective fraction of heat of complete combustion decrease as m 02 is increased; for m 02 values much higher than 0.233, all the parameters approach their respective asymptotic values. There appears to be an attenuation of flame radiation by cold vapors near the surface as well as a change in the flame shape as m 02 is varied.
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