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A Prediction Formula for Heat Transfer Coefficient on Combustion Chamber Walls in Internal Combustion Engines~An Examination of Existing Empirical Formula Based on Experimental Results of All Combustion Chamber Wall Surfaces
Published October 12, 2011 by Society of Automotive Engineers of Japan in Japan
Heat transfer coefficients were obtained from measured instantaneous surface temperature and heat flux at 100 points on all the combustion chamber walls of a direct injection diesel engine. When heat transfer coefficients based on the experiment were compared with those calculated from Eichelberg's and Woschni's formulas, it was clearly shown that rates of temporal change were considerably different in some portions. In this paper, causes of the difference are discussed so that insights useful for proposal of a more widely applicable formula with higher accuracy can be obtained.