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    Spray combustion simulation study of waste cooking oil biodiesel and diesel under direct injection diesel engine conditions

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    pagination_JFUE_117240 (1)[1].pdf
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    Description:
    Accepted manuscript
    Embargo End Date:
    2022-02-06
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    Description:
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    Embargo End Date:
    2022-02-06
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    Type
    Article
    Authors
    Kuti, Olawole Abiola
    Sarathy, Mani cc
    Nishida, Keiya
    KAUST Department
    Chemical Engineering Program
    Clean Combustion Research Center
    Combustion and Pyrolysis Chemistry (CPC) Group
    Physical Science and Engineering (PSE) Division
    Date
    2020-02-06
    Online Publication Date
    2020-02-06
    Print Publication Date
    2020-05
    Embargo End Date
    2022-02-06
    Submitted Date
    2019-07-30
    Permanent link to this record
    http://hdl.handle.net/10754/661545
    
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    Abstract
    Spray combustion characteristics of waste cooking oil biodiesel (WCO) and conventional diesel fuels were simulated using a RANS (Reynolds Averaged Navier Stokes) based model. Surrogates were used to represent WCO and diesel fuels in simulations. N-tetradecane (C14H30) and n-heptane (C7H16) were used as surrogates for diesel. Furthermore for WCO, surrogate mixtures of methyl decanoate, methyl-9-decenoate and n-heptane were used. Thermochemical and reaction kinetic data (115 species and 460 reactions) were implemented in the CFD code to simulate the spray and combustion processes of the two fuels. Validation of the spray liquid length, ignition delay, flame lift-off length and soot formation data were performed against previous published experimental results. The modeled data agreed with the trends obtained in the experimental data at all injection pressures. Further investigations, which were not achieved in previous experiments, showed that prior to main ignition, a first stage ignition (cool flame) characterized by the formation formaldehyde (CH2O) species at low temperature heat release occurred. The main ignition process occurred at high temperature with the formation of OH radicals. Furthermore, it was observed that the cool flame played a greater role in stabilizing the downstream lifted flame of both fuels. Increase in injection pressure led to the cool flame location to be pushed further downstream. This led to flame stabilization further away from the injector nozzle. WCO had shorter lift-off length compared to diesel as a result of its cool flame which being closer to the injector. Soot formation followed similar trends obtained in the experiments.
    Citation
    Kuti, O. A., Sarathy, S. M., & Nishida, K. (2020). Spray combustion simulation study of waste cooking oil biodiesel and diesel under direct injection diesel engine conditions. Fuel, 267, 117240. doi:10.1016/j.fuel.2020.117240
    Sponsors
    The authors will like to thank the KAUST high performance computing (HPC) laboratory for their assistance in using many computer CPUs for the simulation activities.
    Publisher
    Elsevier BV
    Journal
    Fuel
    DOI
    10.1016/j.fuel.2020.117240
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0016236120302350
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.fuel.2020.117240
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; Clean Combustion Research Center

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