Radiation Heat Transfer of Combustion Flames in a Diesel Engine

概要

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The instantaneous monochromatic infrared radiation from the combustion flames of a four stroke, direct injection, no-swirl diesel engine was investigated. The radiant emission was found t be well described essentially by the continuous spectral emission from the soot-particle cloud, on which the gaseous emission bands of 1.9, 2.9, and 4.2 μm were superimposed. Also it was found that the flame around the periphery of the combustion chamber cavity emitted much stronger radiation than the one in the middle. Such instantaneous characteristics of the luminous flames as the spectra land total intensities, temperature, apparent optical thickness and emissivity were obtained at four typical measuring points for various fuel air ratios. High speed photographs of the movements of the flames were taken to promote the physical understanding of the radiant emission in diesel engine.