Influence of Atomization Quality on Mixture Formation, Combustion and Emissions in a MPI-Engine Under Cold-Start Conditions, Part II 2002-01-2806
The intention of the study presented in this two part paper is to investigate the influence oalf primary mixture formation on engine running behavior, covering the areas of combustion and raw emissions. Two different concepts for primary fuel atomization were utilized and compared, the standard production injector and a flash boiling injector. The flash boiling injector is characterized by a significant reduction in droplet size and a partial direct vaporization during the injection process by preheating the fuel inside the injector. In this study special emphasis was laid on the transient process of engine start between typical cooling water temperatures of -7°C and 85°C. Various measurements and visualization techniques had been applied to investigate mixture preparation, deposition of liquid fuel on the walls, start of combustion, and in-cylinder as well as engine-out UHC emissions.
Citation: Tribulowski, J., Spicher, U., Richter, B., Dullenkopf, K. et al., "Influence of Atomization Quality on Mixture Formation, Combustion and Emissions in a MPI-Engine Under Cold-Start Conditions, Part II," SAE Technical Paper 2002-01-2806, 2002, https://doi.org/10.4271/2002-01-2806. Download Citation
Jan Tribulowski, Ulrich Spicher, Boyke Richter, Klaus Dullenkopf, Sigmar Wittig
Institute for Reciprocating Engines, University of Karlsruhe, Institute for Thermal Turbomachinery, University of Karlsruhe
SAE Powertrain & Fluid Systems Conference & Exhibition
SAE 2002 Transactions Journal of Fuels and Lubricants-V111-4