Modeling of Fuel Spray Formation and Combustion

Conference poster, 2012

In order to satisfactorily model the mixing of fuel with air, a good understanding of all the different processes occuring, such as spray break-up and evaporation, is required and these must be captured by the model. Spray simulations of both full cone Diesel sprays and hollow cone gasoline sprays were performed using the VSB2 spray model. The modeling of turbulent combustion offers difficulties, since both the turbulent mixing of vapor fuel with air and the turbulence-chemistry interaction have to be described. The Volume Reactor Fraction Model (VRFM) is based on the Eddy Dissipation Concept, introduced by Magnussen in 1981. The reactor volume is depending on the state of unmixedness in mixture space and in chemical progress space. The simulated lift-off lengths of n-heptane sprays are compared to experimental data from the Engine Combustion Network.