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    Impact of the Flameholder Heat Conductivity on Combustion Instability Characteristics

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    Type
    Conference Paper
    Authors
    Hong, Seunghyuck
    Shanbhogue, Santosh J.
    Ghoniem, Ahmed F.
    KAUST Grant Number
    KUS-110-010-01
    Date
    2013-07-09
    Online Publication Date
    2013-07-09
    Print Publication Date
    2012-06-11
    Permanent link to this record
    http://hdl.handle.net/10754/598570
    
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    Abstract
    In this paper, we investigate the impact of heat transfer between the flame and the flame-holder on the dynamic stability characteristics in a 50-kW backward facing step combustor. We conducted tests where we use a backward step block made of two different materials: ceramic and stainless steel whose thermal conductivities are 1.06 and 12 W/m/K, respectively. A set of experiments was conducted using a propane/air mixture at Re = 6500 for the inlet temperature of 300 - 500 K at atmospheric pressure. We measure the dynamic pressure and flame chemiluminescence to examine distinct stability characteristics using each flame-holder material over a range of operating conditions. We find that for tests with a flame-holder made of ceramic, the onset of instability is significantly delayed in time and, for certain operating conditions, disappears altogether. Stated differently, for certain operating conditions, the combustor can be stabilized by reducing the thermal conductivity of the flame-holder. As the thermal conductivity of the flame-holder increases, the combustor becomes increasingly unstable over a range of operating conditions. These results imply that the dynamic stability characteristics depend strongly on the heat transfer between the flame and the combustor wall near the flame anchoring region. Copyright © 2012 by ASME.
    Citation
    Hong S, Shanbhogue SJ, Ghoniem AF (2012) Impact of the Flameholder Heat Conductivity on Combustion Instability Characteristics. Volume 2: Combustion, Fuels and Emissions, Parts A and B. Available: http://dx.doi.org/10.1115/gt2012-70057.
    Sponsors
    The authors would like to acknowledge the King Abdullah University of Science and Technology for their support of this research. This work was funded by the KAUST grant, number KUS-110-010-01.
    Publisher
    ASME International
    Journal
    Volume 2: Combustion, Fuels and Emissions, Parts A and B
    DOI
    10.1115/gt2012-70057
    ae974a485f413a2113503eed53cd6c53
    10.1115/gt2012-70057
    Scopus Count
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