Shock tube studies of methyl butanoate pyrolysis with relevance to biodiesel

Handle URI:
http://hdl.handle.net/10754/562383
Title:
Shock tube studies of methyl butanoate pyrolysis with relevance to biodiesel
Authors:
Farooq, Aamir ( 0000-0001-5296-2197 ) ; Ren, Wei; Lam, Kingyiu; Davidson, David Frank; Hanson, Ronald Kenneth; Westbrook, Charles K.
Abstract:
Methyl butanoate pyrolysis and decomposition pathways were studied in detail by measuring concentration time-histories of CO, CO 2, CH 3, and C 2H 4 using shock tube/laser absorption methods. Experiments were conducted behind reflected shock waves at temperatures of 1200-1800K and pressures near 1.5atm using mixtures of 0.1%, 0.5%, and 1% methyl butanoate in Argon. A novel laser diagnostic was developed to measure CO in the ν 1 fundamental vibrational band near 4.56μm using a new generation of quantum-cascade lasers. Wavelength modulation spectroscopy with second-harmonic detection (WMS-2f) was used to measure CO 2 near 2752nm. Methyl radical was measured using UV laser absorption near 216nm, and ethylene was monitored using IR gas laser absorption near 10.53μm. An accurate methyl butanoate model is critical in the development of mechanisms for larger methyl esters, and the measured time-histories provide kinetic targets and strong constraints for the refinement of the methyl butanoate reaction mechanism. Measured CO mole fractions reach plateau values that are the same as the initial fuel mole fraction at temperatures higher than 1500K over the maximum measurement time of 2ms or less. Two recent kinetic mechanisms are compared with the measured data and the possible reasons for this 1:1 ratio between MB and CO are discussed. Based on these discussions, it is expected that similar CO/fuel and CO 2/fuel ratios for biodiesel molecules, particularly saturated components of biodiesel, should occur. © 2012 The Combustion Institute.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Chemical Kinetics & Laser Sensors Laboratory
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
Nov-2012
DOI:
10.1016/j.combustflame.2012.05.013
Type:
Article
ISSN:
00102180
Sponsors:
The experiments were performed at Stanford University. The kinetics work of the Stanford authors was supported by the Combustion Energy Frontier Research Center (CEFRC) and the diagnostic development work by the Air Force Office of Scientific Research (AFOSR) with Drs. J. Tishkoff and C. Li as technical monitors. The work by Dr. Westbrook of Lawrence Livermore National Laboratory was supported by the US Department of Energy with program managers Gurpreet Singh and Kevin Stork.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorFarooq, Aamiren
dc.contributor.authorRen, Weien
dc.contributor.authorLam, Kingyiuen
dc.contributor.authorDavidson, David Franken
dc.contributor.authorHanson, Ronald Kennethen
dc.contributor.authorWestbrook, Charles K.en
dc.date.accessioned2015-08-03T10:03:16Zen
dc.date.available2015-08-03T10:03:16Zen
dc.date.issued2012-11en
dc.identifier.issn00102180en
dc.identifier.doi10.1016/j.combustflame.2012.05.013en
dc.identifier.urihttp://hdl.handle.net/10754/562383en
dc.description.abstractMethyl butanoate pyrolysis and decomposition pathways were studied in detail by measuring concentration time-histories of CO, CO 2, CH 3, and C 2H 4 using shock tube/laser absorption methods. Experiments were conducted behind reflected shock waves at temperatures of 1200-1800K and pressures near 1.5atm using mixtures of 0.1%, 0.5%, and 1% methyl butanoate in Argon. A novel laser diagnostic was developed to measure CO in the ν 1 fundamental vibrational band near 4.56μm using a new generation of quantum-cascade lasers. Wavelength modulation spectroscopy with second-harmonic detection (WMS-2f) was used to measure CO 2 near 2752nm. Methyl radical was measured using UV laser absorption near 216nm, and ethylene was monitored using IR gas laser absorption near 10.53μm. An accurate methyl butanoate model is critical in the development of mechanisms for larger methyl esters, and the measured time-histories provide kinetic targets and strong constraints for the refinement of the methyl butanoate reaction mechanism. Measured CO mole fractions reach plateau values that are the same as the initial fuel mole fraction at temperatures higher than 1500K over the maximum measurement time of 2ms or less. Two recent kinetic mechanisms are compared with the measured data and the possible reasons for this 1:1 ratio between MB and CO are discussed. Based on these discussions, it is expected that similar CO/fuel and CO 2/fuel ratios for biodiesel molecules, particularly saturated components of biodiesel, should occur. © 2012 The Combustion Institute.en
dc.description.sponsorshipThe experiments were performed at Stanford University. The kinetics work of the Stanford authors was supported by the Combustion Energy Frontier Research Center (CEFRC) and the diagnostic development work by the Air Force Office of Scientific Research (AFOSR) with Drs. J. Tishkoff and C. Li as technical monitors. The work by Dr. Westbrook of Lawrence Livermore National Laboratory was supported by the US Department of Energy with program managers Gurpreet Singh and Kevin Stork.en
dc.publisherElsevier BVen
dc.subjectBiodieselen
dc.subjectKineticsen
dc.subjectMethyl butanoateen
dc.subjectPyrolysisen
dc.subjectShock tubeen
dc.titleShock tube studies of methyl butanoate pyrolysis with relevance to biodieselen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentChemical Kinetics & Laser Sensors Laboratoryen
dc.identifier.journalCombustion and Flameen
dc.contributor.institutionStanford University, Stanford, CA 94305, United Statesen
dc.contributor.institutionLawrence Livermore National Laboratory, CA 94550, United Statesen
kaust.authorFarooq, Aamiren
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