Effect of Turbulence in Intake Port of MPI Engine on Fuel Transport Phenomena and Nonuniformity of Fuel/Air Mixing in Cylinder

900162

02/01/1990

Event
International Congress & Exposition
Authors Abstract
Content
Three zone mixture preparation model, assuming that fuel and air are distributed in three separate zones, fuel air and mixture zone, was proposed. Air Utilization Efficiency derived from the model was used to evaluate the mixing nonuniformity.
Effect of the large scale nonisotropic turbulence downstream of the dimple or edge in the intake port of MPI engine on the convective mass transfer from fuel film was clarified by the proposed nondimensional index, Local Sherwood Number. It was found that when the fuel is injected toward the wall where large scale turbulence exists, almost all of the fuel is seeded in the air passing the region at the beginning of the intake process, resulting in the time-resolved nonuniformity of the mixture strength at the intake valve.
Using the Air Utilization Efficiency, it was elucidated that time-resolved mixing nonuniformity at intake valves induces spatially nonuniform fuel/air distribution in the cylinder.
Meta TagsDetails
DOI
https://doi.org/10.4271/900162
Pages
14
Citation
Takemura, J., Sanbuyashi, D., and Ando, H., "Effect of Turbulence in Intake Port of MPI Engine on Fuel Transport Phenomena and Nonuniformity of Fuel/Air Mixing in Cylinder," SAE Technical Paper 900162, 1990, https://doi.org/10.4271/900162.
Additional Details
Publisher
Published
Feb 1, 1990
Product Code
900162
Content Type
Technical Paper
Language
English