Abstract
The heat transfer processes taking place in the combustion chamber of direct-injection diesel engines are reviewed based on experiments performed in an atmospheric test rig, where a diesel engine spray was impinging vertically and at an angle onto a heated plate with and without a cross-stream of air simulating swirl, and in a single-cylinder engine incorporating a variable swirl mechanism. The convective heat transfer associated with the impinging spray on the wall of the piston-bowl and the radiative heat transfer associated with the high temperature soot particles formed during combustion were estimated for two swirl ratios, based on the measured temperature of the gas and the piston wall by means of two-colour pyrometry and fast-response thermocouples, respectively.
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