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    A computational study of syngas auto-ignition characteristics at high-pressure and low-temperature conditions with thermal inhomogeneities

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    Type
    Article
    Authors
    Pal, Pinaki cc
    Mansfield, Andrew B.
    Arias, Paul G.
    Wooldridge, Margaret S.
    Im, Hong G. cc
    KAUST Department
    Clean Combustion Research Center
    Computational Reacting Flow Laboratory (CRFL)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2015-07-30
    Online Publication Date
    2015-07-30
    Print Publication Date
    2015-09-03
    Permanent link to this record
    http://hdl.handle.net/10754/594067
    
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    Abstract
    A computational study was conducted to investigate the characteristics of auto-ignition in a syngas mixture at high-pressure and low-temperature conditions in the presence of thermal inhomogeneities. Highly resolved one-dimensional numerical simulations incorporating detailed chemistry and transport were performed. The temperature inhomogeneities were represented by a global sinusoidal temperature profile and a local Gaussian temperature spike (hot spot). Reaction front speed and front Damköhler number analyses were employed to characterise the propagating ignition front. In the presence of a global temperature gradient, the ignition behaviour shifted from spontaneous propagation (strong) to deflagrative (weak), as the initial mean temperature of the reactant mixture was lowered. A predictive Zel'dovich–Sankaran criterion to determine the transition from strong to weak ignition was validated for different parametric sets. At sufficiently low temperatures, the strong ignition regime was recovered due to faster passive scalar dissipation of the imposed thermal fluctuations relative to the reaction timescale, which was quantified by the mixing Damköhler number. In the presence of local hot spots, only deflagrative fronts were observed. However, the fraction of the reactant mixture consumed by the propagating front was found to increase as the initial mean temperature was lowered, thereby leading to more enhanced compression-heating of the end-gas. Passive scalar mixing was not found to be important for the hot spot cases considered. The parametric study confirmed that the relative magnitude of the Sankaran number translates accurately to the quantitative strength of the deflagration front in the overall ignition advancement. © 2015 Taylor & Francis
    Citation
    Pal P, Mansfield AB, Arias PG, Wooldridge MS, Im HG (2015) A computational study of syngas auto-ignition characteristics at high-pressure and low-temperature conditions with thermal inhomogeneities. Combustion Theory and Modelling 19: 587–601. Available: http://dx.doi.org/10.1080/13647830.2015.1068373.
    Sponsors
    US Department of Energy via the National Energy Technology Laboratory[DE-FE0007465]
    Publisher
    Informa UK Limited
    Journal
    Combustion Theory and Modelling
    DOI
    10.1080/13647830.2015.1068373
    ae974a485f413a2113503eed53cd6c53
    10.1080/13647830.2015.1068373
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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