ID 422

Application of an Equilibrium Phase (EP) Spray Model to Multi-component Gasoline Direct Injection

 

Abstract:

An Equilibrium Phase (EP) spray model was recently proposed for modeling high-pressure diesel fuel injection, based on the jet theory and a phase equilibrium assumption. In this approach, the non-equilibrium processes of drop breakup, collision and surface vaporization are neglected, assuming the spray vaporization is a mixing-controlled equilibrium process. A liquid-jet model and a gas-jet model were also introduced to improve the grid-independency. In the current study, the EP model is applied in simulation of multi-hole gasoline direct injection. The model is validated at ambient density from 3 to 9 kg/m3 and ambient temperature from 400 K to 900 K, for two different injectors, i.e. Engine Combustion Network (ECN) Spray G injector and GM injector. Iso-octane is used as the surrogate to be consistent with the experiments. The results show good agreement in terms of liquid/vapor penetration, shape of vapor envelope, and velocity evolution along injector centerline. Then, a 10-component gasoline surrogate fuel is used to demonstrate the capability of this model for multi-component spray simulation, which is essential to engine combustion and emission predictions.