On the Monochromatic Distribution of the Radiation from the Luminous Flame

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The spectroscopic analyses of the radiation from the luminous flame of the liquid fuel and the gaseous fuel were carried out in the wavelength range from 1.5μ to 5.4μ, and the monochromatic infrared spectra of the radiation from the soot particle cloud were measured. The results obtained are as follows. The radiation from the soot particle cloud in the luminous flame is a continuous spectrum like the one from solid surface and not a band spectrum. The radiation from the luminous flame is composed of band spectra of the gas and a continuous spectrum of the soot particles. The high emissivity of the soot particle cloud is caused by the high continuous spectrum. The monochromatic absorption coefficients of the soot particle clouds obtained in this experiment differ from the theoretical values but the effects of the size distributions upon the monochromatic absorption coefficients agree well with each other. The relation between the effective emission thickness and the total emissivity of the soot particle cloud which is calculated from the present monochromatic emissivity agrees very well with the author's previous result obtained using radiation pyrometer.