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    Lift-off of non-premixed turbulent CH4 jet flames at elevated pressures

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    Type
    Conference Paper
    Authors
    Guiberti, Thibault
    Boyette, W. R.
    Elbaz, Ayman M.
    Masri, A. R.
    Roberts, William L. cc
    KAUST Department
    Clean Combustion Research Center
    Physical Science and Engineering (PSE) Division
    Clean Combustion Research Center, KAUST, Thuwal, 23955, Saudi Arabia
    Mechanical Engineering Program
    Date
    2017-01-01
    Permanent link to this record
    http://hdl.handle.net/10754/666787
    
    Metadata
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    Abstract
    In this study, the lift-off behavior of non-premixed turbulent jet flames (120 kPa to 500 kPa) is explored at elevated pressures, extending the current knowledge limited to sub-atmospheric and atmospheric pressure conditions. Experiments are conducted in the high-pressure combustion duct (HPCD) available at CCRC-KAUST. Flames are issued from a 4.58 mm inner diameter nozzle using methane as fuel and are maintained within an air coflow featuring a 0.6 m.s-1 velocity. Results show that, regardless of pressure, if the fuel jet velocity U exceeds a critical value, detachment occurs and flames are lifted and stabilized at a height h above the nozzle. The velocity leading to detachment decreases with pressure. Regardless of pressure, if the fuel jet velocity U is further increased after detachment the lift-off height h increases linearly. However, it is observed that the slope of the h(U) curve is insensitive to pressure if p ≤ 300 kPa but decreases rapidly with pressure if p > 300 kPa. One-dimensional laminar flames calculations are conducted to understand the influence of pressure on important properties of methane/air flames such as their laminar flame speed and extinction strain rate. These results are used to explain the experimental observations.
    Sponsors
    This work is supported by CCRC-KAUST.
    Publisher
    Eastern States Section of the Combustion Institute
    Conference/Event name
    10th U.S. National Combustion Meeting
    Additional Links
    https://research.kaust.edu.sa/en/publications/lift-off-of-non-premixed-turbulent-chsub4sub-jet-flames-at-elevat
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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