Experimental and Numerical Investigation of Ethanol/Diethyl Ether Mixtures in a CI Engine

Handle URI:
http://hdl.handle.net/10754/625215
Title:
Experimental and Numerical Investigation of Ethanol/Diethyl Ether Mixtures in a CI Engine
Authors:
Sivasankaralingam, Vedharaj; Raman, Vallinayagam ( 0000-0003-4478-8525 ) ; Jaasim, Mohammed; Alfazazi, Adamu; Lu, Tianfeng; Im, Hong G. ( 0000-0001-7080-1266 ) ; Sarathy, Mani ( 0000-0002-3975-6206 ) ; Dibble, Robert W. ( 0000-0002-4002-9356 )
Abstract:
The auto-ignition characteristics of diethyl ether (DEE)/ethanol mixtures are investigated in compression ignition (CI) engines both numerically and experimentally. While DEE has a higher derived cetane number (DCN) of 139, ethanol exhibits poor ignition characteristics with a DCN of 8. DEE was used as an ignition promoter for the operation of ethanol in a CI engine. Mixtures of DEE and ethanol (DE), i.e., DE75 (75% DEE + 25% ethanol), DE50 (50% DEE + 50% ethanol) and DE25 (25% DEE + 75% ethanol), were tested in a CI engine. While DE75 and DE50 auto-ignited at an inlet air pressure of 1.5 bar, DE25 failed to auto-ignite even at boosted pressure of 2 bar. The peak in-cylinder pressure for diesel and DE75 were comparable, while DE50 showed reduced peak in-cylinder pressure with delayed start of combustion (SOC). Numerical simulations were conducted to study the engine combustion characteristics of DE mixture. A comprehensive detailed chemical kinetic model was created to represent the combustion of DE mixtures. The detailed mechanism was then reduced using standard direct relation graph (DRG-X) method and coupled with 3D CFD code, CONVERGE, to simulate the experimental data. The simulation results showed that the effects of physical properties on DE50 combustion are negligible. Simulations of DE50 mixture revealed that the combustion is nearly homogenous, while diesel (n-heptane used as a surrogate) and DE75 showed similar combustion behavior with flame liftoff and diffusion controlled combustion. Diesel exhibited auto-ignition at an equivalence ratio of 2, while DE75 and DE50 showed auto-ignition in the equivalence ratio range of 1-1.5 and 0-1, respectively. The experiments and numerical simulations demonstrate how the high reactivity of DEE supports the auto-ignition of ethanol, while ethanol acts as a radical scavenger.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Chemical and Biological Engineering Program
Citation:
Sivasankaralingam V, Raman V, Mubarak Ali MJ, Alfazazi A, Lu T, et al. (2016) Experimental and Numerical Investigation of Ethanol/Diethyl Ether Mixtures in a CI Engine. SAE Technical Paper Series. Available: http://dx.doi.org/10.4271/2016-01-2180.
Publisher:
SAE International
Journal:
SAE Technical Paper Series
Conference/Event name:
SAE International Powertrains, Fuels and Lubricants Meeting, FFL 2016
Issue Date:
17-Oct-2016
DOI:
10.4271/2016-01-2180
Type:
Conference Paper
Sponsors:
This work was funded by competitive research funding from King Abdullah University of Science and Technology (KAUST) under the Clean Combustion Research Center's Future Fuels program. We also acknowledge funding from KAUST and Saudi Aramco under the FUELCOM program. Finally, we would like to express our gratitude to our Research Technician, Adrian. I. Ichim, for his support in carrying out the engine experiments at KAUST engine lab.
Additional Links:
https://saemobilus.sae.org/content/2016-01-2180
Appears in Collections:
Conference Papers; Physical Sciences and Engineering (PSE) Division; Chemical and Biological Engineering Program; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorSivasankaralingam, Vedharajen
dc.contributor.authorRaman, Vallinayagamen
dc.contributor.authorJaasim, Mohammeden
dc.contributor.authorAlfazazi, Adamuen
dc.contributor.authorLu, Tianfengen
dc.contributor.authorIm, Hong G.en
dc.contributor.authorSarathy, Manien
dc.contributor.authorDibble, Robert W.en
dc.date.accessioned2017-07-19T10:45:00Z-
dc.date.available2017-07-19T10:45:00Z-
dc.date.issued2016-10-17en
dc.identifier.citationSivasankaralingam V, Raman V, Mubarak Ali MJ, Alfazazi A, Lu T, et al. (2016) Experimental and Numerical Investigation of Ethanol/Diethyl Ether Mixtures in a CI Engine. SAE Technical Paper Series. Available: http://dx.doi.org/10.4271/2016-01-2180.en
dc.identifier.doi10.4271/2016-01-2180en
dc.identifier.urihttp://hdl.handle.net/10754/625215-
dc.description.abstractThe auto-ignition characteristics of diethyl ether (DEE)/ethanol mixtures are investigated in compression ignition (CI) engines both numerically and experimentally. While DEE has a higher derived cetane number (DCN) of 139, ethanol exhibits poor ignition characteristics with a DCN of 8. DEE was used as an ignition promoter for the operation of ethanol in a CI engine. Mixtures of DEE and ethanol (DE), i.e., DE75 (75% DEE + 25% ethanol), DE50 (50% DEE + 50% ethanol) and DE25 (25% DEE + 75% ethanol), were tested in a CI engine. While DE75 and DE50 auto-ignited at an inlet air pressure of 1.5 bar, DE25 failed to auto-ignite even at boosted pressure of 2 bar. The peak in-cylinder pressure for diesel and DE75 were comparable, while DE50 showed reduced peak in-cylinder pressure with delayed start of combustion (SOC). Numerical simulations were conducted to study the engine combustion characteristics of DE mixture. A comprehensive detailed chemical kinetic model was created to represent the combustion of DE mixtures. The detailed mechanism was then reduced using standard direct relation graph (DRG-X) method and coupled with 3D CFD code, CONVERGE, to simulate the experimental data. The simulation results showed that the effects of physical properties on DE50 combustion are negligible. Simulations of DE50 mixture revealed that the combustion is nearly homogenous, while diesel (n-heptane used as a surrogate) and DE75 showed similar combustion behavior with flame liftoff and diffusion controlled combustion. Diesel exhibited auto-ignition at an equivalence ratio of 2, while DE75 and DE50 showed auto-ignition in the equivalence ratio range of 1-1.5 and 0-1, respectively. The experiments and numerical simulations demonstrate how the high reactivity of DEE supports the auto-ignition of ethanol, while ethanol acts as a radical scavenger.en
dc.description.sponsorshipThis work was funded by competitive research funding from King Abdullah University of Science and Technology (KAUST) under the Clean Combustion Research Center's Future Fuels program. We also acknowledge funding from KAUST and Saudi Aramco under the FUELCOM program. Finally, we would like to express our gratitude to our Research Technician, Adrian. I. Ichim, for his support in carrying out the engine experiments at KAUST engine lab.en
dc.publisherSAE Internationalen
dc.relation.urlhttps://saemobilus.sae.org/content/2016-01-2180en
dc.rightsArchived with thanks to SAE Technical Paper Seriesen
dc.titleExperimental and Numerical Investigation of Ethanol/Diethyl Ether Mixtures in a CI Engineen
dc.typeConference Paperen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentChemical and Biological Engineering Programen
dc.identifier.journalSAE Technical Paper Seriesen
dc.conference.date2016-10-24 to 2016-10-26en
dc.conference.nameSAE International Powertrains, Fuels and Lubricants Meeting, FFL 2016en
dc.conference.locationBaltimore, MD, USAen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionUniv of Connecticut, , United Statesen
kaust.authorSivasankaralingam, Vedharajen
kaust.authorRaman, Vallinayagamen
kaust.authorJaasim, Mohammeden
kaust.authorAlfazazi, Adamuen
kaust.authorIm, Hong G.en
kaust.authorSarathy, Manien
kaust.authorDibble, Robert W.en
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