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    Combustion behavior of ammonia blended with diethyl ether

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    Name:
    NH3_DEE_revised2_Unmarked.pdf
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    1.171Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2022-09-08
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    Type
    Article
    Authors
    Issayev, Gani cc
    Giri, Binod
    Elbaz, Ayman M.
    Shrestha, Krishna P. cc
    Mauss, Fabian
    Roberts, William L. cc
    Farooq, Aamir 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
    2020-09-08
    Online Publication Date
    2020-09-08
    Print Publication Date
    2020-09
    Embargo End Date
    2022-09-08
    Submitted Date
    2019-11-03
    Permanent link to this record
    http://hdl.handle.net/10754/665063
    
    Metadata
    Show full item record
    Abstract
    Ammonia (NH3) is recognized as a carbon-free hydrogen-carrier fuel with a high content of hydrogen atoms per unit volume. Recently, ammonia has received increasing attention as a promising alternative fuel for internal combustion engine and gas turbine applications. However, the viability of ammonia fueling future combustion devices has several barriers to overcome. To overcome the challenge of its low reactivity, it is proposed to blend it with a high-reactivity fuel. In this work, we have investigated the combustion characteristics of ammonia/diethyl ether (NH3/DEE) blends using a rapid compression machine (RCM) and a constant volume spherical reactor (CVSR). Ignition delay times (IDTs) of NH3/DEE blends were measured using the RCM over a temperature range of 620 to 942 K, pressures near 20 and 40 bar, equivalence ratios (Φ) of 1 and 0.5, and a range of mole fractions of DEE, χDEE, from 0.05 to 0.2 (DEE/NH3 = 5 – 20%). Laminar burning velocities of NH3/DEE premixed flames were measured using the CVSR at 298 K, 1 bar, Φ of 0.9 to 1.3, and χDEE from 0.1 to 0.4. Our results indicate that DEE promotes the reactivity of fuel blends resulting in significant shortening of the ignition delay times of ammonia under RCM conditions. IDTs expectedly exhibited strong dependence on pressure and equivalence ratio for a given blend. Laminar burning velocity was found to increase with increasing fraction of DEE. The burnt gas Markstein length increased with equivalence ratio for χDEE = 0.1 as seen in NH3-air flames, while the opposite evolution of Markstein length was observed with Φ for 0.1 < χDEE ≤ 0.4, as observed in isooctane-air flames. A detailed chemical kinetics model was assembled to analyze and understand the combustion characteristics of NH3/DEE blends.
    Citation
    Issayev, G., Giri, B. R., Elbaz, A. M., Shrestha, K. P., Mauss, F., Roberts, W. L., & Farooq, A. (2020). Combustion behavior of ammonia blended with diethyl ether. Proceedings of the Combustion Institute. doi:10.1016/j.proci.2020.06.337
    Sponsors
    Research reported in this publication was funded by the Office of Sponsored Research (OSR) at King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2020.06.337
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1540748920304302
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2020.06.337
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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