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    Dual-camera high-speed imaging of the ignition modes of ethanol, methanol and n-hexane in a shock tube

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    Figueroa-Labastida et al. Dual-camera high-speed imaging of the ignition modes of ethanol, methanol and n-hexane in a shock tube.pdf
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    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Figueroa Labastida, Miguel cc
    Badra, Jihad
    Farooq, Aamir cc
    KAUST Department
    Chemical Kinetics & Laser Sensors Laboratory
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020-07-17
    Online Publication Date
    2020-07-17
    Print Publication Date
    2020-07
    Submitted Date
    2020-04-18
    Permanent link to this record
    http://hdl.handle.net/10754/664377
    
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    Abstract
    Shock tubes are used as homogeneous batch reactors to measure ignition delay times, reaction rate coefficients and species time-histories of a variety of chemical systems. Any non-ideality or inhomogeneity in the shock tube experiment would affect the quality and usefulness of measured data. Experimental and computational efforts have previously been carried out to characterize the regimes of ideal operation of shock tubes. High-speed imaging has proven to be a highly useful tool to assess ignition homogeneity. In this work, a dual-camera setup has been used with an optical end-section in a circular shock tube to obtain simultaneous high-speed images from the shock tube endwall and sidewall, thus providing visualization of the ignition phenomenon in three dimensions. Two case studies are presented herein to demonstrate the quality of data and insights that are obtained using this diagnostic technique to study the ignition modes of different fuels. The first is a comparison of the ignition of two alternative fuels, methanol and ethanol, and the second is a study of the ignition dependence on the fuel concentration of a representative paraffinic fuel, n-hexane. The unique dual-camera imaging diagnostic enabled deeper insights into the ignition homogeneity, with all fuels exhibiting localized ignition at low temperatures. Methanol showed a higher propensity than ethanol to ignite far from the endwall, and the high concentration of n-hexane led to inhomogeneous ignition.
    Citation
    Figueroa-Labastida, M., Badra, J., & Farooq, A. (2020). Dual-camera high-speed imaging of the ignition modes of ethanol, methanol and n-hexane in a shock tube. Combustion and Flame. doi:10.1016/j.combustflame.2020.07.002
    Sponsors
    The paper is based on work supported by Saudi Aramco Research and Development Center FUELCOM program under Master Research Agreement Number 6600024505/01. FUELCOM (Fuel Combustion for Advanced Engines) is a collaborative research undertaking between Saudi Aramco and KAUST intended to address the fundamental aspects of hydrocarbon fuel combustion in engines, and develop fuel/engine design tools suitable for advanced combustion modes.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2020.07.002
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0010218020302649
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2020.07.002
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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