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    Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures

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    Type
    Article
    Authors
    Wang, Qiang
    Hu, Longhua
    Chung, Suk Ho cc
    KAUST Department
    Clean Combustion Research Center
    Combustion and Laser Diagnostics Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-12-09
    Online Publication Date
    2016-12-09
    Print Publication Date
    2017-02
    Permanent link to this record
    http://hdl.handle.net/10754/622178
    
    Metadata
    Show full item record
    Abstract
    Blow-out limits of nonpremixed turbulent jet flames in quiescent air at sub-atmospheric pressures (50–100 kPa) were studied experimentally using propane fuel with nozzle diameters ranging 0.8–4 mm. Results showed that the fuel jet velocity at blow-out limit increased with increasing ambient pressure and nozzle diameter. A Damköhler (Da) number based model was adopted, defined as the ratio of characteristic mixing time and characteristic reaction time, to include the effect of pressure considering the variations in laminar burning velocity and thermal diffusivity with pressure. The critical lift-off height at blow-out, representing a characteristic length scale for mixing, had a linear relationship with the theoretically predicted stoichiometric location along the jet axis, which had a weak dependence on ambient pressure. The characteristic mixing time (critical lift-off height divided by jet velocity) adjusted to the characteristic reaction time such that the critical Damköhler at blow-out conditions maintained a constant value when varying the ambient pressure.
    Citation
    Wang Q, Hu L, Chung SH (2017) Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures. Combustion and Flame 176: 358–360. Available: http://dx.doi.org/10.1016/j.combustflame.2016.11.016.
    Sponsors
    This work was supported by the National Natural Science Foundation of China (NSFC) under Grant no. 51606057, Key Project of NSFC under Grant no. 51636008, Excellent Young Scientist Fund of NSFC under Grant no. 51422606, Newton Advanced Fellowship (RS Grant no. NA140102; NSFC Grant no. 5141101261), Key Research Program of Frontier Sciences, Chinese Academy of Science (CAS) under Grant no. QYZDB-SSW-JSC029, Fok Ying Tong Education Foundation under Grant no. 151056, Fundamental Research Funds for the Central Universities under Grant no. WK2320000035, and China Postdoctoral Science Foundation (No. 2016M590580). SHC was supported by King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2016.11.016
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S001021801630356X
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2016.11.016
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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