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    Impact of Equivalence Ratio on the Macrostructure of Premixed Swirling CH 4 /Air and CH 4 /O 2 /CO 2 Flames

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    Type
    Conference Paper
    Authors
    Watanabe, Hirotatsu
    Shanbhogue, Santosh J.
    Ghoniem, Ahmed F.
    KAUST Grant Number
    KUS-110-010-01
    Date
    2015-08-12
    Online Publication Date
    2015-08-12
    Print Publication Date
    2015-06-15
    Permanent link to this record
    http://hdl.handle.net/10754/598562
    
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    Abstract
    Premixed CH4/O2/CO2 flames (oxy-flames) and CH4/air flames (air-flames) were experimentally studied in a swirl-stabilized combustor. For comparing oxy and air flames, the same equivalence ratio and adiabatic flame temperature were used. CO2 dilution was adjusted to attain the same adiabatic temperature for the oxy-flame and the corresponding air-flame while keeping the equivalence ratio and Reynolds number (=20,000) the same. For high equivalence ratios, we observed flames stabilized along the inner and outer shear layers of the swirling flow and sudden expansion, respectively, in both flames. However, one notable difference between the two flames appears as the equivalence ratio reaches 0.60. At this point, the outer shear layer flame disappears in the air-flame while it persists in the oxy-flame, despite the lower burning velocity of the oxy-flame. Prior PIV measurements (Ref. 9) showed that the strains along the outer shear layer are higher than along the inner shear layer. Therefore, the extinction strain rates in both flames were calculated using a counter-flow premixed twin flame configuration. Calculations at the equivalence ratio of 0.60 show that the extinction strain rate is higher in the oxy than in the air flame, which help explain why it persists on the outer shear layer with higher strain rate. It is likely that extinction strain rates contribute to the oxy-flame stabilization when air flame extinguish in the outer shear layer. However, the trend reverses at higher equivalence ratio, and the cross point of the extinction strain rate appears at equivalence ratio of 0.64.
    Citation
    Watanabe H, Shanbhogue SJ, Ghoniem AF (2015) Impact of Equivalence Ratio on the Macrostructure of Premixed Swirling CH 4 /Air and CH 4 /O 2 /CO 2 Flames . Volume 4B: Combustion, Fuels and Emissions. Available: http://dx.doi.org/10.1115/gt2015-43224.
    Sponsors
    This work was supported by a grant from King AbdullahUniversity of Science and Technology (KAUST), Grant No. KUS-110-010-01.
    Publisher
    ASME International
    Journal
    Volume 4B: Combustion, Fuels and Emissions
    DOI
    10.1115/gt2015-43224
    ae974a485f413a2113503eed53cd6c53
    10.1115/gt2015-43224
    Scopus Count
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    Publications Acknowledging KAUST Support

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