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    Influence of the laminar burning velocity on the transfer functions of premixed methane and propane swirl flames

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    Name:
    INFLUENCE OF THE LAMINAR BURNING VELOCITY ON THE TRANSFER FUNCTIONS OF PREMIXED METHANE AND PROPANE SWIRL FLMAES_GT2019-90870_Accepted version.pdf
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    7.175Mb
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    PDF
    Description:
    Accepted manuscript
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    Type
    Conference Paper
    Authors
    Di Sabatino, Francesco
    Guiberti, Thibault
    Moeck, J. P.
    Roberts, William L. cc
    Lacoste, Deanna cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    high-pressure combustion (HPC) Research Group
    Date
    2019-11-05
    Online Publication Date
    2019-11-05
    Print Publication Date
    2019-06-17
    Permanent link to this record
    http://hdl.handle.net/10754/660633
    
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    Abstract
    The effects of the laminar burning velocity (SL), on the transfer functions of propane-air and methane-air swirl flames is experimentally investigated. Five equivalence ratios for each fuel are selected, to yield different values of SL. The flame transfer function (FTF), is obtained by comparing the velocity fluctuations of the incoming flow, measured with a hot wire, to the heat release rate oscillations, collecting OH∗ chemiluminescence with a photomultiplier tube. Phase-locked images of OH∗ chemiluminescence are also acquired to analyze the flame dynamics during the forcing cycle. The unforced velocity fields are measured by particle image velocimetry to assess the effects of SL on the flow fields. Changing the laminar burning velocity affects mainly the gain around 176 Hz and 336 Hz. This paper focuses on 336 Hz. The flame vortex roll-up is recognized as a key parameter controlling the gain of the FTF around 336 Hz. The analysis highlights that SL influences the gain response around 336 Hz in two competing ways: first, it enhances the flame vortex roll-up and second, it affects the stabilization distance of the flame, which influences the vortex generated by acoustic forcing.
    Citation
    Di Sabatino, F., Guiberti, T. F., Moeck, J. P., Roberts, W. L., & Lacoste, D. A. (2019). Influence of the Laminar Burning Velocity on the Transfer Functions of Premixed Methane and Propane Swirl Flames. Volume 4A: Combustion, Fuels, and Emissions. doi:10.1115/gt2019-90870
    Sponsors
    This work is funded by the King Abdullah University of Science and Technology and by the Deutsche Forschungsgemeinschaft through the GECCO project.
    Publisher
    American Society of Mechanical Engineers
    Conference/Event name
    ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition, GT 2019
    DOI
    10.1115/GT2019-90870
    Additional Links
    https://asmedigitalcollection.asme.org/GT/proceedings/GT2019/58615/Phoenix,%20Arizona,%20USA/1066749
    ae974a485f413a2113503eed53cd6c53
    10.1115/GT2019-90870
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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