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TECHNICAL PAPERS: Injection and Fuel Air Mixture Preparation

The Formation of a Combustible Mixture During the First Cycle of Cranking and Startup in a Port-Fuel-Injected Spark-Ignition Engine

[+] Author and Article Information
J. S. Cowart

Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139

J. Eng. Gas Turbines Power 125(2), 402-411 (Apr 29, 2003) (10 pages) doi:10.1115/1.1563237 History: Received March 01, 2002; Revised July 01, 2002; Online April 29, 2003
Copyright © 2003 by ASME
Topics: Fuels , Engines , Cycles , Cylinders , Vapors
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References

Figures

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Engine starting positions for cylinder #4
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Characteristic ambient engine start from initial position C
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Reformulated gasoline distillation curve with six specie multicomponent fuel model shown
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Base model comparison with experimental data at various starting positions. Both hot and ambient start results are shown.
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A simulated hot start at position A. The fraction of each fuel specie that remains in the puddle during the first engine cycle is shown.
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Model predicted injection mass necessary for stoichiometric in-cylinder fueling from 20–100°C starting temperature
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Comparison of model results to production engine calibrations and Zetec experimental data
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Position A hot start experimental data and modeling results
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Position A hot start modeling details with crevice pooling occurring at mid-high fuel injection levels
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A schematic representation of the intake port during (1) stoichiometric and lean fueling, (2) rich fueling with crevice, and (3) excessively rich fueling during hot starting
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Hot start model comparison to data at positions D and E
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Ambient starting model comparison to experimental data at position A
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Conduction length into a liquid fuel film initially at 20°C from a wall at 90°C versus time. Estimated deep crevice depths are also shown.

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