Abstract
This paper describes the application of an analytical model based on established heat-transfer correlations to the prediction of lubricating oil temperatures in a diesel engine. Predictions are compared with experimental results from a number of stationary engines run at various speeds and loads and quite good agreement is shown. The model takes account of heat transferred from the combustion gases to the oil directly and indirectly, and of friction heat generated at bearings, piston rings and cylinder liner. The oil is partly cooled in the oil cooler. In small engines a substantial portion of this heat is convected from the engine surfaces, while in large engines not a negligible portion is convected. Equilibrium between the heat to oil and heat from oil to coolant and the ambient air determines the steady state oil temperature.
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