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Modeling of Fuel Droplets Deposition Rate in Port Injected Spark Ignition Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 01, 1995 by SAE International in United States
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A very accurate control of air fuel ratio in port injected spark ignition engines during transient is required to reach the toughest polluant emissions standards. The prediction of air fuel ratio behavior has been made with models for liquid fuel film, droplets and fuel vapor in the intake manifold of single point injected engines , where the droplet deposition rate on the manifold was only a parameter.
This paper describes a model for droplet deposition rate on the port walls and intake valve in port injected engines. The model described here takes into account the transient character of fuel injection in a real port geometry. The droplet diameter distribution is included with seven different droplet sizes, and varies across the spray, with a multicomponent fuel. The backflow of hot burned gas at valve opening is also taken into account by the model.
The depostion rate on the valve and the port walls as a function of space and time has been calculated for several operating conditions. The droplet diameter distribution, the injector angle as well as the injector-valve distance were also varied.
Finally a comparison of the equivalence ratio calculated with a global model including the deposition rate description with the measured equivalence ratio is given for a transient test, showing a really good correlation between calculated and measured air fuel ratios.
CitationMaroteaux, F. and Moyne, F., "Modeling of Fuel Droplets Deposition Rate in Port Injected Spark Ignition Engine," SAE Technical Paper 952484, 1995, https://doi.org/10.4271/952484.
- MAROTEAUX F., THELLIEZ M “Modeling of unsteady multiphase flow in the intake manifold of spark ignition engines” SAE paper 910392
- Naber, J.D and Reitz, R.D “Modeling engine spray/wall impingement” SAE paper 880107
- Reitz, R.D and Rutland, C.J “3-D modeling of diesel engine intake flow, combustion and emissions” SAE paper 911789
- Senda, J, Tanabe, Y and Fujimoto, H “Visualization and quantitative analysis of fuel vapor concentration in diesel spray” Proc, 1st atomization, 1992
- Yoshikawa, Y and al“Numerical simulation system for analazing fuel film flow in gazoline engine” SAE paper 930326
- MAROTEAUX D.“Contribution à l’étude de la formation du mélange air-carburant dans les moteurs à allumage commandé” These Université PARIS6, 1992
- Senda J, NishikoriT., Tsukamoto T, Fujimoto H.“Atomization of spray under low pressure field from pintle type gasoline injector” SAE paper920382
- Lenz H.P, Fraidl GK, Friedl H, “Fuel atomization with mixturepreparation systems of SI-Engines” SAE paper 885015
- Pontoppidan M, Cristiani M, “Consequence of atomization improvement of port injectors by air-shrouding theory and industrial solution” SAE paper 930322