Multidimensional numerical simulation of heat radiation in direct injection diesel engines

A multidimensional theoretical model of radiation heat transfer in the cyli nder of a direct injection (DI) diesel engine has been developed, which inc ludes submodels of heat release, geometrical description, radiation tempera ture, soot formation and oxidation, the absorption coefficient and the Mont e Carlo method for total exchange areas. In this code, the cylinder is divi ded into 10 surface zones and four gas zones. The Monte Carlo method integr ated with a smoothing technique considering reciprocity and conservation is used to calculate the radiation total exchange areas directly for both the absorbing-emitting media and the complex structure of the cylinder. Using the multidimensional approach, the variation in radiant heat transfer with crank angle can be obtained across the whole combustion chamber. The comput ed results are analysed and discussed in the present study, and they are fo und to be in agreement with the experimental results.