Abstract
Experimental investigation and modeling of fuel wall films from gasoline direct injection nozzles
Highlights
Soot particles are generated in combustion engines when globally or locally understoichiometric mixtures of fuel and air combined with high surrounding temperatures appear
In gasoline direct injection engines, these wall films can appear on the piston, the liner, the valves or on the tip of the injection nozzle and to an increased degree during the engine start where the surfaces are still cold and wall films evaporate too slowly
The investigation of fuel wall films is a central task within the effort to reduce particulate emissions especially under cold conditions
Summary
Soot particles are generated in combustion engines when globally or locally understoichiometric mixtures of fuel and air combined with high surrounding temperatures appear. This occurs when the mixture preparation in the gas phase is not sufficient or when fuel wall films are formed. To understand the temporal development of those wall films and their evaporation behaviour, investigations can be performed using different measurement techniques. These can be grouped into optical, gravimetric, electrical and acoustic techniques and a good overview is given in [5]. A DoE of the varied parameters and the nozzle geometry is intended
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