An experimental study has been made on the radiation properties of laminar, luminous premixed flame at atmospheric pressure. By installing a pair of porous media at the upstream and downstream sides of the combustion space, excess enthalpy burning was applied to the CH_4 -air mixture. As a result, a luminous flat flame with very low burning velocity was realized, unlike the conventional combustion. In the wavelength range of 0.4 - 4.0 mum, measurements were made on spectral radiation intensity and spectral transmittance; taking the emission from the flame into account, the absorptivity and absorption coefficient for the flame were also obtained. It was found that the luminous radiation mainly consists of a continuous spectrum from the solid phase and band spectra from gases, while emitted radiation intensity is partially absorbed by radiative gases. In particular, at wavelengths longer than 2.4 mum, radiation intensity of gases is stronger than that of the solid phase.
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