Calculation of Gas Radiation from a Rectangular Parallelepiped Gas Mass Surrounded by Transparent Gas : 2nd Report, On the Area Ratio of Flame to Furnace

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The results of tests on fourteen boilers conducted by the ASME Research Committee and one boiler in Japan are analyzed in this paper to find the area ratios, accordingly the volume ratios of flame to furnace. The volume ratio is less than 0.2 in most cases and is about 0.25 even in the extreme case, when 0.8 m^<-1> is used as the coefficient of absorption in the flame of coal and heavy oil and 0.25 m^<-1> in the flame of natural gas and when a mean flame temperature is assumed as 1/2 (adiabatic flame temperature+furnace exit gas temperature). So the frequency distribution of the heat-flow intensity on the walls irradiated by a uniform flame surrounded by transparent gas, as shown in the first report, coincides closely with that by the actual flame. The value of the ratio can be determined as a function of combustion intensity in each firing system with a burner of horizontal type, vertical type or tangential type (coalor oil-fired), a horizontal type (gas-fired), a stoker and a spreader-stoker.
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