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    An Experimental and Kinetic Modeling Study of Laminar Flame Speed of Dimethoxymethane and Ammonia Blends

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    Type
    Article
    Authors
    Elbaz, Ayman M.
    Giri, Binod
    Issayev, Gani
    Shrestha, Krishna Prasad
    Mauss, Fabian
    Farooq, Aamir cc
    Roberts, William L. cc
    KAUST Department
    Chemical Kinetics & Laser Sensors Laboratory
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    high-pressure combustion (HPC) Research Group
    Date
    2020-09-28
    Online Publication Date
    2020-09-28
    Print Publication Date
    2020-11-19
    Embargo End Date
    2021-09-28
    Permanent link to this record
    http://hdl.handle.net/10754/665423
    
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    Abstract
    Ammonia (NH3) is considered a promising carbon-neutral fuel, with high hydrogen content, that can diversify the global energy system. Blending ammonia with a highly reactive fuel is one possible strategy to enhance it’s combustion characteristics. Here, an investigation of blends of NH3 and dimethoxymethane (DMM), a biofuel with high fuel-born oxygen content and no carbon-carbon bonds, is reported. Unstretched laminar burning velocity (SL) and Markstein length of different NH3/DMM blends were experimentally determined using spherically propagating premixed flames. The DMM mole fraction was varied from 0.2 to 0.6 while measuring SL at 298 K, 0.1 MPa and equivalence ratios () over a range of 0.8 to 1.3. The addition of DMM was found to immensely enhanced the combustion characteristics of ammonia. DMM 20% in NH3/DMM blend increased SL more than a factor of 3 over neat ammonia; such enhancement was found to be comparable with 60% CH4 in NH3 ( = 0.9 -1.1) blends. Increasing  was found to significantly decrease the burned gas Markestein length for lean cases, whereas a negligible effect was observed for rich mixtures. A composite chemical kinetic model of DMM/NH3, aimed at interpreting the high-temperature combustion chemistry, was able to reliably predict SL for neat NH3 and DMM flames. Also, the predictive capability of the kinetic model to describe SL for DMM/NH3 blends is reasonably good. Sensitivity analysis and reaction paths analysis indicated that the NH3/DMM blends could be understood as the dual oxidation processes of the individual fuels which are competing for the same radical pool.
    Citation
    Elbaz, A. M., Giri, B. R., Issayev, G., Shrestha, K. P., Mauss, F., Farooq, A., & Roberts, W. L. (2020). An Experimental and Kinetic Modeling Study of Laminar Flame Speed of Dimethoxymethane and Ammonia Blends. Energy & Fuels. doi:10.1021/acs.energyfuels.0c02269
    Sponsors
    The research reported in this publication was supported by the Office of Sponsored Research (OSR) at King Abdullah University of Science and Technology (KAUST).
    Publisher
    American Chemical Society (ACS)
    Journal
    Energy & Fuels
    DOI
    10.1021/acs.energyfuels.0c02269
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.energyfuels.0c02269
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.energyfuels.0c02269
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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