Abstract
The paper describes the application of the CFD code FIRE to the simulation of spray combustion and pollutant formation in a medium speed marine diesel engine. Fortwo engine operating conditions and different injection nozzle / piston geometry configurations, space and time resolved flow field quantities and cylinder-averaged global data are presented. The simulation results provide a detailed insight into the governing physical and chemical processes of spray combustion and pollutant formation. Clear identification of the important cause and effect of the injection nozzle / piston geometry arrangement on the pollutant formation processes is enabled. For the engine configurations and operating conditions considered the calculated cylinder-averaged results show good agreement with the measured data.