Influence of Atomization Quality on Mixture Formation, Combustion and Emissions in a MPI-Engine Under Cold-Start Conditions, Part I 2002-01-2807
The study presented in this two part paper was focused on the influence of primary mixture formation on engine running behavior covering the areas 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 spray generated by the flash boiling injector was 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 put on the transient process of engine start between typical cooling water temperatures of -7°C and 85°C. Various measurements and visualization techniques were applied to investigate the mixture preparation, the deposition of liquid fuel on the walls, the start of combustion, and in-cylinder and engine-out UHC emissions.
Citation: Richter, B., Dullenkopf, K., Wittig, S., Tribulowski, J. et al., "Influence of Atomization Quality on Mixture Formation, Combustion and Emissions in a MPI-Engine Under Cold-Start Conditions, Part I," SAE Technical Paper 2002-01-2807, 2002, https://doi.org/10.4271/2002-01-2807. Download Citation
Boyke Richter, Klaus Dullenkopf, Sigmar Wittig, Jan Tribulowski, Ulrich Spicher
Institute for Thermal Turbomachinery, University of Karlsruhe, Institute for Reciprocating Engines, University of Karlsruhe
SAE Powertrain & Fluid Systems Conference & Exhibition
SAE 2002 Transactions Journal of Fuels and Lubricants-V111-4