The air, fuel vapor and droplets flow through an engine induction system is studied by a one-dimensional two-phase flow model that includes evaporation and droplet coalescence. The conservation equations and pertinent constitutive relations are solved numerically by the Bulirsch-Stoer integration scheme. Previous results are reproduced to check the calculation accuracy and parametric studies of two-phase droplet flow in a straight pipe are carried out. Heating of manifold walls is found to be the most effective way to reduce droplet size and to improve evaporation. Other important parameters investigated include proper amounts of exhaust gas recirculation, fuel type and initial droplet size. The performance and effectiveness of a supersonic venturi with normal shock is also studied. The conclusion reached is that the main advantage of a supersonic vs. a conventional subsonic venturi, is its relatively high air velocity at fuel injection location which results in better initial mean droplet size distribution but not its evaporation efficiency.
Investigation of fuel-droplet flow in an idealized automotive engine induction system
Untersuchung der Kraftstofftropfen-Stroemung im idealen Ansaugsystem eines Kfz-Motors
US ; 1-125
1976
125 Seiten
Hochschulschrift
Englisch
Parametric Study of Fuel-Droplet Flow in an Idealized Automotive Engine Induction System
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