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    Experimental analysis of the effect of fuels on the flame describing function of a swirl-stabilized premixed flame

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    Type
    Conference Paper
    Authors
    Sabatino, Francesco Di
    Guiberti, Thibault cc
    Moeck, Jonas P.
    Roberts, William L. cc
    Lacoste, Deanna cc
    KAUST Department
    Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
    Clean Combustion Research Center
    Physical Science and Engineering (PSE) Division
    Mechanical Engineering Program
    Date
    2017-01-01
    Permanent link to this record
    http://hdl.handle.net/10754/666737
    
    Metadata
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    Abstract
    A study of the fuel-dependence of the Flame Describing Function (FDF) of a swirl-stabilized premixed flame is carried out. A swirl-stabilized burner, a hot wire to measure the velocity and a loudspeaker system to generate acoustic perturbations compose the experimental apparatus. The optical diagnostics include a photomultiplier tube to collect CH* chemiluminescence and an ICCD camera to acquire phase-locked images of OH* chemiluminescence to analyze the flame dynamics. A propane/air mixture with an equivalence ratio (Φ) equal to 0.7 and a methane/air mixture with an equivalence ratio equal to 0.67 are considered. The equivalence ratios are slightly different for the two fuels to maintain similar flame shape and size. Five different levels of forcing amplitude, from 5% to 25% of relative velocity fluctuation, are examined. The gain of the two FDFs shows the characteristic behavior for this type of flame: a local minimum followed by a local maximum. Moreover, increasing the forcing amplitude, the value of the local maximum of gain decreases. This is verified for the two considered fuels. Analyzing the phase-locked images of OH* chemiluminescence, it is possible to conclude that the size of the vortex roll-up at the tip of the flame plays an important role in the reduction of the value of the local maximum of gain when methane replaces propane.
    Sponsors
    This work is partly funded by the Center of Competitive Funding from King Abdullah University of Science and Technology (Grant number 1975).
    Publisher
    Combustion Institute
    Conference/Event name
    11th Asia-Pacific Conference on Combustion, ASPACC 2017
    Additional Links
    https://research.kaust.edu.sa/en/publications/experimental-analysis-of-the-effect-of-fuels-on-the-flame-describ
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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