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    New insights into methane-oxygen ion chemistry

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    Type
    Article
    Authors
    Alquaity, Awad cc
    Chen, Bingjie cc
    Han, Jie cc
    Selim, Hatem
    Belhi, Memdouh cc
    Karakaya, Yasin
    Kasper, Tina
    Sarathy, Mani cc
    Bisetti, Fabrizio cc
    Farooq, Aamir cc
    KAUST Department
    Chemical Engineering Program
    Chemical Kinetics & Laser Sensors Laboratory
    Clean Combustion Research Center
    Combustion and Pyrolysis Chemistry (CPC) Group
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Reactive Flow Modeling Laboratory (RFML)
    Date
    2016-06-15
    Online Publication Date
    2016-06-15
    Print Publication Date
    2017
    Permanent link to this record
    http://hdl.handle.net/10754/627028
    
    Metadata
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    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.
    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.
    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).
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2016.05.053
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2016.05.053
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; Mechanical Engineering Program; Clean Combustion Research Center

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