Heat Transfer of Combustion Chamber Wall of a Diesel Engine

An experimental investigation has been undertaken with its main goal is to validate an innovative experimental facility and to establish a methodology to evaluate whether there is difference between the heat flux of thermal distribution across the intake and exhaust side of internal combustion chamber of an air-cooled diesel engine. Spatial and time-averaged temperature measurements have been performed in order to estimate the heat flux of heat conductivity on the engine. Temperatures data were measured under a wide range of speed and applied load at eight locations in the engine cylinder block employing conventional Type-K thermocouple arranged to obtain one-dimensional metal thermal gradients and subsequently deduce the corresponding conductive heat flux from the wall surface temperature across the engine block. Results which were recorded throughout this work had revealed a realistic trend in wall surface temperature as function of engine load for a given engine speed. It also consistent with the theory that in-cylinder gas temperature will decrease across the engine stroke as combusted gas expanded. Result analysis lead the proposal of an initial concept that proposed heat loss in the mode of conductive heat transfer are more concentrated on exhaust side of engine combustion chamber compared to the intake side.