SIMULATION OF FUEL FILM FORMATION IN DUCTS

The fuel/air mixing processes in spark ignition engines are currently receiving considerable attention due to the combined requirements of m inimising both global and local pollution levels while maintaining hig h engine efficiencies. During preparation for combustion in the intake manifold, the fuel flow exists in several streams, these being vapour , liquid droplets and liquid wall film. While this research is aimed a t examining fuel film behaviour in general, the particular emphasis of this paper is on the application of a numerical technique to obtain a better understanding of film formation. A number of specific configur ations have been examined and can be compared with experimental data f rom a specially designed rig. While precise experimental measurements are not yet available, the numerical results correspond well with the qualitative assessment from the rig.