New insights into methane-oxygen ion chemistry

Handle URI:
http://hdl.handle.net/10754/627028
Title:
New insights into methane-oxygen ion chemistry
Authors:
Alquaity, Awad B.S.; Chen, Bingjie; Han, Jie ( 0000-0002-6176-8684 ) ; Selim, Hatem; Belhi, Memdouh ( 0000-0003-4307-4950 ) ; Karakaya, Yasin; Kasper, Tina; Sarathy, Mani ( 0000-0002-3975-6206 ) ; Bisetti, Fabrizio ( 0000-0001-5162-7805 ) ; Farooq, Aamir ( 0000-0001-5296-2197 )
Abstract:
External electric fields may reduce emissions and improve combustion efficiency by active control of combustion processes. In-depth, quantitative understanding of ion chemistry in flames enables predictive models to describe the effect of external electric fields on combustion plasma. This study presents detailed cation profile measurements in low-pressure, burner-stabilized, methane/oxygen/argon flames. A quadrupole molecular beam mass spectrometer (MBMS) coupled to a low-pressure (P =30Torr) combustion chamber was utilized to measure ion signals as a function of height above the burner. Lean, stoichiometric and rich flames were examined to evaluate the dependence of ion chemistry on flame stoichiometry. Additionally, for the first time, cataloging of flame cations is performed using a high mass resolution time-of-flight mass spectrometer (TOF-MS) to distinguish ions with the same nominal mass. In the lean and stoichiometric flames, the dominant ions were HO, CHO , CHO, CHO and CHO, whereas large signals were measured for HO, CH and CHO in the rich flame. The spatial distribution of cations was compared with results from numerical simulations constrained by thermocouple-measured flame temperatures. Across all flames, the predicted HO decay rate was noticeably faster than observed experimentally. Sensitivity analysis showed that the mole fraction of HO is most sensitive to the rate of chemi-ionization CH+O↔CHO +E. To our knowledge, this work represents the first detailed measurements of positive ions in canonical low-pressure methane flames.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Chemical and Biological Engineering Program; Mechanical Engineering Program; Clean Combustion Research Center
Citation:
Alquaity ABS, Chen B, Han J, Selim H, Belhi M, et al. (2017) New insights into methane-oxygen ion chemistry. Proceedings of the Combustion Institute 36: 1213–1221. Available: http://dx.doi.org/10.1016/j.proci.2016.05.053.
Publisher:
Elsevier BV
Journal:
Proceedings of the Combustion Institute
Issue Date:
15-Jun-2016
DOI:
10.1016/j.proci.2016.05.053
Type:
Article
ISSN:
1540-7489
Sponsors:
This work was supported by an Academic Excellence Alliance (AEA) grant, titled Electromagnetically-Enhanced Combustion, awarded by the Office of Sponsored Research at King Abdullah University of Science and Technology (KAUST).
Appears in Collections:
Articles; 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.authorAlquaity, Awad B.S.en
dc.contributor.authorChen, Bingjieen
dc.contributor.authorHan, Jieen
dc.contributor.authorSelim, Hatemen
dc.contributor.authorBelhi, Memdouhen
dc.contributor.authorKarakaya, Yasinen
dc.contributor.authorKasper, Tinaen
dc.contributor.authorSarathy, Manien
dc.contributor.authorBisetti, Fabrizioen
dc.contributor.authorFarooq, Aamiren
dc.date.accessioned2018-02-01T12:01:30Z-
dc.date.available2018-02-01T12:01:30Z-
dc.date.issued2016-06-15en
dc.identifier.citationAlquaity ABS, Chen B, Han J, Selim H, Belhi M, et al. (2017) New insights into methane-oxygen ion chemistry. Proceedings of the Combustion Institute 36: 1213–1221. Available: http://dx.doi.org/10.1016/j.proci.2016.05.053.en
dc.identifier.issn1540-7489en
dc.identifier.doi10.1016/j.proci.2016.05.053en
dc.identifier.urihttp://hdl.handle.net/10754/627028-
dc.description.abstractExternal electric fields may reduce emissions and improve combustion efficiency by active control of combustion processes. In-depth, quantitative understanding of ion chemistry in flames enables predictive models to describe the effect of external electric fields on combustion plasma. This study presents detailed cation profile measurements in low-pressure, burner-stabilized, methane/oxygen/argon flames. A quadrupole molecular beam mass spectrometer (MBMS) coupled to a low-pressure (P =30Torr) combustion chamber was utilized to measure ion signals as a function of height above the burner. Lean, stoichiometric and rich flames were examined to evaluate the dependence of ion chemistry on flame stoichiometry. Additionally, for the first time, cataloging of flame cations is performed using a high mass resolution time-of-flight mass spectrometer (TOF-MS) to distinguish ions with the same nominal mass. In the lean and stoichiometric flames, the dominant ions were HO, CHO , CHO, CHO and CHO, whereas large signals were measured for HO, CH and CHO in the rich flame. The spatial distribution of cations was compared with results from numerical simulations constrained by thermocouple-measured flame temperatures. Across all flames, the predicted HO decay rate was noticeably faster than observed experimentally. Sensitivity analysis showed that the mole fraction of HO is most sensitive to the rate of chemi-ionization CH+O↔CHO +E. To our knowledge, this work represents the first detailed measurements of positive ions in canonical low-pressure methane flames.en
dc.description.sponsorshipThis work was supported by an Academic Excellence Alliance (AEA) grant, titled Electromagnetically-Enhanced Combustion, awarded by the Office of Sponsored Research at King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.subjectCationsen
dc.subjectElectric fieldsen
dc.subjectIon chemistryen
dc.subjectLow-pressure flameen
dc.subjectMBMSen
dc.titleNew insights into methane-oxygen ion chemistryen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentChemical and Biological Engineering Programen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalProceedings of the Combustion Instituteen
dc.contributor.institutionMass Spectrometry in Reactive Flows - Thermodynamics (IVG), University of Duisburg-Essen, Duisburg, Germanyen
kaust.authorAlquaity, Awad B.S.en
kaust.authorChen, Bingjieen
kaust.authorHan, Jieen
kaust.authorSelim, Hatemen
kaust.authorBelhi, Memdouhen
kaust.authorSarathy, Manien
kaust.authorBisetti, Fabrizioen
kaust.authorFarooq, Aamiren
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