Methanol Fuel Testing on Port Fuel Injected Internal-Only EGR, HPL-EGR and D-EGR® Engine Configurations

The primary focus of this investigation was to determine the hydrogen reformation, efficiency and knock mitigation benefits of methanol-fueled Dedicated EGR (D-EGR®) operation, when compared to other EGR types. A 2.0 L turbocharged port fuel injected engine was operated with internal EGR, high-press...

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Bibliographic Details
Published in:SAE International Journal of Fuels and Lubricants 2017-11, Vol.10 (3), p.718-727, Article 2017-01-2285
Main Authors: Randolph, Eric, Gukelberger, Raphael, Alger, Terrence, Briggs, Thomas, Chadwell, Christopher, Bosquez Jr, Antonio
Format: Article
Language:English
Subjects:
Combustion
Combustion efficiency
Configurations
Cylinders
Dilution
Efficiency
Equivalence ratio
Exhaust gas recirculation systems
Fuel injectors
Fuel research
Gasoline
Hydrogen fuels
Knock
Methanol
Octane
Superchargers
Testing
Thermodynamic efficiency
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Summary:The primary focus of this investigation was to determine the hydrogen reformation, efficiency and knock mitigation benefits of methanol-fueled Dedicated EGR (D-EGR®) operation, when compared to other EGR types. A 2.0 L turbocharged port fuel injected engine was operated with internal EGR, high-pressure loop (HPL) EGR and D-EGR configurations. The internal, HPL-EGR, and D-EGR configurations were operated on neat methanol to demonstrate the relative benefit of D-EGR over other EGR types. The D-EGR configuration was also tested on high octane gasoline to highlight the differences to methanol. An additional sub-task of the work was to investigate the combustion response of these configurations. Methanol did not increase its H2 yield for a given D-EGR cylinder equivalence ratio, even though the H:C ratio of methanol is over twice typical gasoline. Although the methanol H2 reformate yield did not increase over gasoline for a given equivalence ratio, the total yield did increase due to an extended rich misfire limit of the dedicated cylinder. Methanol-fueled D-EGR extended the maximum load of the engine by 2 bar BMEP. It also improved CoV of IMEP, increased dilution tolerance, improved combustion efficiency, and improved thermal efficiency. Cooled EGR also suppressed hot spot pre-ignition of methanol.
ISSN:1946-3952
1946-3960
1946-3960
DOI:10.4271/2017-01-2285