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    Auto-Ignition and Spray Characteristics of n-Heptane and iso-Octane Fuels in Ignition Quality Tester

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    Type
    Conference Paper
    Authors
    Jaasim, Mohammed
    Elhagrasy, Ayman
    Sarathy, Mani cc
    Chung, Suk Ho cc
    Im, Hong G. cc
    KAUST Department
    Chemical Engineering Program
    Clean Combustion Research Center
    Combustion and Laser Diagnostics Laboratory
    Combustion and Pyrolysis Chemistry (CPC) Group
    Computational Reacting Flow Laboratory (CRFL)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2018-04-03
    Permanent link to this record
    http://hdl.handle.net/10754/627738
    
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    Abstract
    Numerical simulations were conducted to systematically assess the effects of different spray models on the ignition delay predictions and compared with experimental measurements obtained at the KAUST ignition quality tester (IQT) facility. The influence of physical properties and chemical kinetics over the ignition delay time is also investigated. The IQT experiments provided the pressure traces as the main observables, which are not sufficient to obtain a detailed understanding of physical (breakup, evaporation) and chemical (reactivity) processes associated with auto-ignition. A three-dimensional computational fluid dynamics (CFD) code, CONVERGE™, was used to capture the detailed fluid/spray dynamics and chemical characteristics within the IQT configuration. The Reynolds-averaged Navier-Stokes (RANS) turbulence with multi-zone chemistry sub-models was adopted with a reduced chemical kinetic mechanism for n-heptane and iso-octane. The emphasis was on the assessment of two common spray breakup models, namely the Kelvin-Helmholtz/Rayleigh-Taylor (KH-RT) and linearized instability sheet atomization (LISA) models, in terms of their influence on auto-ignition predictions. Two spray models resulted in different local mixing, and their influence in the prediction of auto-ignition was investigated. The relative importance of physical ignition delay, characterized by spray evaporation and mixing processes, in the overall ignition behavior for the two different fuels were examined. The results provided an improved understanding of the essential contribution of physical and chemical processes that are critical in describing the IQT auto-ignition event at different pressure and temperature conditions, and allowed a systematic way to distinguish between the physical and chemical ignition delay times.
    Citation
    Mubarak Ali MJ, Elhagrasy A, Sarathy M, Chung S, Im HG (2018) Auto-Ignition and Spray Characteristics of n-Heptane and iso-Octane Fuels in Ignition Quality Tester. SAE Technical Paper Series. Available: http://dx.doi.org/10.4271/2018-01-0299.
    Sponsors
    The authors acknowledge funding support from the King Abdullah University of Science and Technology and from Saudi Aramco under the FUELCOM program. We thank convergent science for providing their code to perform the simulations.
    Publisher
    SAE International
    Journal
    SAE Technical Paper Series
    Conference/Event name
    2018 SAE World Congress Experience, WCX 2018
    DOI
    10.4271/2018-01-0299
    Additional Links
    https://saemobilus.sae.org/content/2018-01-0299
    ae974a485f413a2113503eed53cd6c53
    10.4271/2018-01-0299
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; Mechanical Engineering Program; Clean Combustion Research Center

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