抄録
In this work we study mixture preparation inside the cylinder of an optically accessible DI gasoline-engine. Crank angle resolved investigation of the atomization process of different model-fuels is carried out by means of planar Mie-scattering. The vaporization of the liquid fuel and the transport processes inside the cylinder are studied by Planar Laser-Induced-Exciplex-Fluorescence (PLIEF) using two different exciplex-systems and two different model-fuels. Besides the standard mono-component model fuel isooctane a newly developed multi component fuel (MCF) was examined. It represents the boiling behaviour of standard gasoline quite well and shows almost the same spectroscopic characteristics as isooctane. The simultaneously recorded crank angle resolved distributions of liquid and vaporized fuel for a stratified and homogeneous operation are visualized for both model fuels and both exciplex-tracers. The corrected intensity values of the fluorescence emissions of the two exciplex-systems TMPD/naphthalene and TEA/benzene were compared under same operation conditions. Furthermore cyclic variations of vaporized fuel distributions near the spark plug are investigated. Simultaneous detection of the in-cylinder pressure allowed the correlation between the fuel vapor distribution near the spark plug and the combustion quality of air-fuel-mixture.
