Review on soot radiation property estimation of combustion process

Investigation on radiation properties of soot is very important to correctly estimate the continuum radiation of flame. The classical spectral absorption coefficient model and gray absorption coefficient model based on Rayleigh theory for soot were introduced and analyzed in details. The progress in soot complex index of refraction research and the application of soot absorption coefficient model constants were summarized. At last, the estimation method of radiation properties of soot aggregate was briefly described, too. It shows that the approximation method based on Rayleigh theory is the main method to predict soot radiation properties up to now, but much attention should be paid to the uncertainty and the selection of model constants. Radiation properties estimation method of soot aggregate based on fractal theory is more accurate, but few application can be found in the flame radiation simulation because of its complexity, except the works on the method itself. Therefore, studies on the radiation properties of soot aggregate in flame should be carried out further.