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Modeling of Air-Fuel Mixing in a Two-Stroke Direct Injection Engine
Technical Paper
2003-01-3103
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents a numerical study on air-fuel mixing in a two-stroke direct injection spark ignition engine under homogeneous operation. The simulated engine is loop scavenged and uses an outwardly opening swirl injector. A generic mesh-snapping algorithm is developed to enable the moving piston to snap through transfer ports with complicated geometry. A spray model based on Linear Instability Sheet Atomization is used to describe the primary breakup of fuel sprays, and the initial rotational velocity of the conical sheet is determined from a CFD simulation of the nozzle internal flow. A wall film model accounting for the effect of contacting area is also developed to avoid the severe grid-dependence of the original film model in KIVA. Comparisons between simulations and experiments were made for sprays in quiescent ambient conditions, and a good agreement of the spray characteristics was obtained. The simulations were performed for four different injection timings. The model was shown to be capable to predict engine-out unburned hydrocarbon emission. It was also found that the mixture preparation around the spark plug is directly related to the engine-out emission, and leaner mixture tends to yield higher engine-out emission.
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Citation
Zeng, Y. and Strauss, S., "Modeling of Air-Fuel Mixing in a Two-Stroke Direct Injection Engine," SAE Technical Paper 2003-01-3103, 2003, https://doi.org/10.4271/2003-01-3103.Also In
Gasoline Direct Injection Engine and Spark Ignition Performance
Number: SP-1807; Published: 2003-10-31
Number: SP-1807; Published: 2003-10-31
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