Cylinder Pressure Characteristics of Turbocharged and Naturally Aspirated Diesel Engines

The article analyses the ways of air charge formation in the diesel engine as well as the principles of cylinder pressure change during the combustion process. As test objects, diesel engines of analogous constructional parameters but of different air charge have been chosen. These are a two cylinder, air-cooling and naturally aspirated diesel engine D120 and a three cylinder, liquid cooling and turbocharged diesel engine Valmet 320DS. The article presents the cylinder pressure characteristics of the named engines on different working regimes, and compares the principles of pressure change in the different positions of crank angle degrees. The study results are used in further improvement of the simulation model of the combustion process.