INSTANTANEOUS HEAT TRANSFER OVER THE PISTON OF A MOTORED DIRECT INJECTION-TYPE DIESEL ENGINE

In the tests described, the instantaneous heat transfer through the piston was measured in a motored direct injection-type diesel engine. The engine piston was equipped with a fast-response thermocouple on the surface and at a specified distance below the surface thermocouple at a number of locations. In order to record and process the measurement of temperature and cylinder pressure, a personal computer (PC)-based data acquisition system was connected to the probes. The results of the experiment are discussed and compared to the previous results and the predictions made by others. The measured heat flux/engine speed relationship agreed with previous results, although the measurements at various positions and at a range of intake manifold pressures did not check with prior predictions. The discrepancies could be attributed to different engine and operation conditions used. (A) For the covering abstract see IRRD 865952.