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    Simultaneous measurements of acetylene and soot during the pyrolysis of ethylene and benzene in a shock tube

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    Type
    Article
    Authors
    KC, Utsav
    Beshir, Mohamed cc
    Farooq, Aamir cc
    KAUST Department
    Chemical Kinetics & Laser Sensors Laboratory
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-10-12
    Online Publication Date
    2016-10-12
    Print Publication Date
    2017
    Permanent link to this record
    http://hdl.handle.net/10754/622335
    
    Metadata
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    Abstract
    Acetylene is one of the most important precursors of soot and contributes to soot growth by the hydrogen-abstraction acetylene-addition (HACA) mechanism. In this work, we undertake time-resolved simultaneous measurements of acetylene and soot behind reflected shock waves at temperatures of 1600-2200. K and pressures of 3-5. bar. Acetylene mole fraction time-histories are measured from the absorption of a quantum-cascade laser operating around 13.6. μm. The soot volume fraction, particle size and number densities are calculated from the extinction and scattering of a cw Nd:Yag laser at 532. nm. Acetylene and soot are generated from the pyrolysis of 1% benzene in argon, 2.35% ethylene in argon, and binary mixtures of ethylene with propane/methane in argon. We note that acetylene time-histories exhibit a two-stage growth during the pyrolysis of benzene, which can be correlated to the initial rapid increase of soot volume fraction and a later plateauing. In comparison to ethylene pyrolysis, the pyrolysis of benzene results in larger values of the soot volume fraction, particle diameter and number density. We compare the measured data against the values simulated using the method-of-moments routine in Chemkin-Pro and a detailed PAH mechanism based on KM2 [1] and AramcoMech 1.3 [2]. Large discrepancies are observed between the measured and predicted values of the soot parameters. The data obtained from our experiments may assist future validation and development of soot mechanisms.
    Citation
    KC U, Beshir M, Farooq A (2016) Simultaneous measurements of acetylene and soot during the pyrolysis of ethylene and benzene in a shock tube. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2016.08.087.
    Sponsors
    King Abdullah University of Science and Technology
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2016.08.087
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2016.08.087
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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