Piston Heating in Diesel Engines

This paper deals with piston temperatures and their asymmetrical distribution. Experiments with a supercharged swirl chamber diesel engine were carried out. Results showed a logarithmic dependence of the relative piston temperature (with respect to inlet temperature) on fuel consumption per hour. This function was independent of engine and blower speeds, as well as of fuel consumption per cycle. Increase of these three parameters resulted in higher values and in increased asymmetry of the piston heating.

The above phenomena can be attributed to a combined effect of the gas stream from the swirl chamber, temperature and pressure of the cylinder gases, and piston velocity.