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    Prediction of Ignition Regimes in DME/Air Mixtures with Temperature and Concentration Fluctuations

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    Type
    Conference Paper
    Authors
    Luong, Minh Bau cc
    Hernandez Perez, Francisco E.
    Sow, Aliou
    Im, Hong G. cc
    KAUST Department
    Clean Combustion Research Center
    Computational Reacting Flow Laboratory (CRFL)
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-01-06
    Online Publication Date
    2019-01-06
    Print Publication Date
    2019-01-07
    Permanent link to this record
    http://hdl.handle.net/10754/630815
    
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    Abstract
    The objective of the present study is to establish a theoretical prediction of the autoignition behavior of a reactant mixture for a given initial bulk mixture condition. The ignition regime criterion proposed by Im and coworkers based on the Sankaran number (Sa), which is a ratio of the laminar flame speed to the spontaneous ignition front speed, is extended to account for both temperature and equivalence ratio fluctuations. The extended ignition criterion is then applied to predict the autoignition characteristics of dimethyl ether (DME)/air mixtures and validated by two-dimensional direct numerical simulations (DNS). The response of the ignition mode of DME/air mixtures to three initial mean temperatures of 770, 900 K, and 1045 K lying within/outside the NTC regime, two levels of temperature and concentration fluctuations at a pressure of 30 atm and equivalence ratio of 0.5 is systematically investigated. The statistical analysis is performed, and a newly developed criterion –the volumetric fraction of Sa < 1.0, FSa,S, is proposed as a deterministic criterion to quantify the fraction of heat release attributed to strong ignition. It is found that the strong and weak ignition modes are well captured by the predicted Sa number and FSa,S regardless of different initial mean temperatures and the levels of mixture fluctuations and correlations. Sap and FSa,S demonstrated under a wide range of initial conditions as a reliable criterion in determining a priori the ignition modes and the combustion intensity.
    Citation
    Luong MB, Hernandez Perez FE, Sow A, Im HG (2019) Prediction of Ignition Regimes in DME/Air Mixtures with Temperature and Concentration Fluctuations. AIAA Scitech 2019 Forum. Available: http://dx.doi.org/10.2514/6.2019-2241.
    Sponsors
    This work was sponsored by competitive research funding from King Abdullah University of Science and Technology. This research used the resources of the KAUST Supercomputing Laboratory (KSL).
    Publisher
    American Institute of Aeronautics and Astronautics (AIAA)
    Journal
    AIAA Scitech 2019 Forum
    DOI
    10.2514/6.2019-2241
    Additional Links
    https://arc.aiaa.org/doi/10.2514/6.2019-2241
    ae974a485f413a2113503eed53cd6c53
    10.2514/6.2019-2241
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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