The Influence of Ambient Temperature and Pressure on Compression-Ignition Engine Performance

Abstract

The effect of changes in atmospheric pressure and temperature on the performance of a compression-ignition engine without a turbocharger has been investigated. In addition, variations in exhaust smoke and temperature, cylinder peak pressure, coolant heat flow, engine friction and air flow rate were observed. A method has been devised for the prediction of the brake power and fuel consumption of an engine at any pressure and temperature using information obtained at normal atmospheric conditions only. This method has been checked using the results of several investigators. A prediction method for calculating the maximum permissible power output is also suggested in relation to various rating criteria.

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