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    An experimental and numerical investigation to characterize the low-temperature heat release in stoichiometric and lean combustion

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    Manuscript_Manuscript_KAUST.pdf
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    1.192Mb
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    PDF
    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Waqas, Muhammad cc
    Cheng, Song cc
    Goldsborough, S. Scott
    Rockstroh, Toby
    Johansson, Bengt cc
    Kolodziej, Christopher P.
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Mechanical Engineering Program
    Clean Combustion Research Center
    Date
    2020-10-01
    Online Publication Date
    2020-10-01
    Print Publication Date
    2020-10
    Embargo End Date
    2022-10-01
    Submitted Date
    2019-11-08
    Permanent link to this record
    http://hdl.handle.net/10754/665429
    
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    Abstract
    This work reports on an experimental and modeling study on the low-temperature heat release (LTHR) characteristics for three RON 90 binary blends (n-heptane blended with isooctane, toluene and ethanol) in a Cooperative Fuel Research (CFR) engine at lean and stoichiometric conditions that are representative of homogeneous charge compression ignition (HCCI) and spark-ignition (SI) end-gas combustion conditions, respectively. An analysis of the end-gas temperature-pressure (T-P) trajectories was performed to identify the intake conditions leading to similar T-P trajectories between the two lambdas for each fuel blend. A heat release analysis was then conducted for the identified cases, where fuel-to-fuel differences in LTHR were identified and found to be sensitive to the operating condition. Simulations were conducted for these cases using a recently updated chemical kinetic model and a 0-D engine model, where good qualitative and reasonable quantitative agreements in LTHR were obtained. Sensitivity analysis was also performed directly on the rates of LTHR, to understand the controlling chemical reactions of LTHR, providing further insights into the fuel-to-fuel differences. The results demonstrate the significant promoting effect of n-heptane on LTHR rates, while inhibiting effects were seen for ethanol and toluene. Also highlighted was the importance of H-atom abstraction reactions from the chemistry of each fuel component, which could lead to contradictory fuel behavior depending on the locations of the H site of the abstraction reaction due to the different ensuing pathways for the primary fuel radicals.
    Citation
    Waqas, M., Cheng, S., Goldsborough, S. S., Rockstroh, T., Johansson, B., & Kolodziej, C. P. (2020). An experimental and numerical investigation to characterize the low-temperature heat release in stoichiometric and lean combustion. Proceedings of the Combustion Institute. doi:10.1016/j.proci.2020.07.146
    Sponsors
    The submitted manuscript has been created in part by UChicago Argonne, LLC, Operator of Argonne National Laboratory (“Argonne”). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357. The U.S. Government retains for itself, and others acting on its behalf, a paid-up nonexclusive, irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan. http://energy.gov/downloads/doe-public-access-plan. This work is performed under the auspices of the Office of Energy Efficiency and Renewable Energy, Office of Vehicle Technology, U.S. Department of Energy, under contract number DE-AC02-06CH11357, as part of the Co-Optimization of Fuels & Engines (Co-Optima).
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2020.07.146
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1540748920306374
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2020.07.146
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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