Experimental study of radiation characteristics and temperature distributions of gasoline and biomass flame

Gasoline and two types of biomass, i.e. shrub boughs and pine boughs were investigated experimentally. The gasoline was the mixture of 500 mL water and 300 mL 92-octane gasoline. The experimental measurement was conducted on a device that contained a colour camera (SP-20000C) and a fibre optic spectrometer (AvaSpec-2048). The device captured spectral intensities via the spectrometer. Colour images were captured on the colour camera. The radiation characteristics, i.e. the wavelength-dependent emissivity in this study, were determined with a multi-wavelength thermometry in accordance with the spectral intensities. The results of emissivity were used so that the temperature distribution was calculated directly using the colour image, with the consideration of the broad response spectrum of the channels of the camera. Radiation characteristics and temperature distributions for these three types of flame were experimentally determined and presented. Results show that, in the visible light region, excluding the spectral lines of alkali metals, the continuous radiation of these flames should result from the similar substance. What is more, the combustion of gasoline (watered) is the most incomplete, resulting in a mass of product of incomplete reaction, and pine boughs were more flammable than shrub boughs.