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    High-speed filtered Rayleigh scattering thermometry in premixed flames through narrow channels

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    High Speed.pdf
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    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Krishna, Yedhu
    Mahuthannan, Ariff Magdoom cc
    Luo, Xinguang
    Lacoste, Deanna cc
    Magnotti, Gaetano cc
    KAUST Department
    Clean Combustion Research Center
    Physical Science and Engineering (PSE) Division
    Mechanical Engineering Program
    Mechanical Engineering
    Date
    2020-11-20
    Online Publication Date
    2020-11-20
    Print Publication Date
    2021-03
    Embargo End Date
    2022-11-20
    Submitted Date
    2020-08-10
    Permanent link to this record
    http://hdl.handle.net/10754/666064
    
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    Abstract
    High-speed filtered Rayleigh scattering at 10 kHz repetition rate for time-resolved temperature measurements in premixed flames propagating in mm-high channels is demonstrated for the first time. The instrument relies on a pulse burst laser with a 200 ns temporal width, and a CCD camera operated in subframe burst gate mode to achieve high signal to noise ratio despite the limited optical access. A 10-inch-long iodine cell acts as a molecular filter and the laser, which is seeded using an external cavity diode laser and operated in a temporally stretched mode, is wavelength-tuned to the peak of a strong iodine absorption line. A CCD camera, operated in the sub-frame burst gating mode with the help of an external slit configuration, is used as the detector to achieve improved camera noise performance. Filtered Rayleigh scattering temperature measurements in premixed flat flames stabilized over a McKenna burner indicate an instrument precision of 3%. Temperature measurements in the products region are within 3% of measurements obtained with conventional Rayleigh scattering. The system's capabilities are demonstrated through time-resolved temperature measurements in a premixed methane-air flame propagating in a 1.5 mm-high rectangular channel designed to study flame quenching in flame arrestors. Surface scattering from the optical windows and the channel surfaces is successfully suppressed and time-resolved temperature profiles are obtained for both quenching and no-quenching events.
    Citation
    Krishna, Y., Mahuthannan, A. M., Luo, X., Lacoste, D. A., & Magnotti, G. (2021). High-speed filtered Rayleigh scattering thermometry in premixed flames through narrow channels. Combustion and Flame, 225, 329–339. doi:10.1016/j.combustflame.2020.10.053
    Sponsors
    The research reported in this publication was funded by King Abdullah University of Science and Technology.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2020.10.053
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S001021802030479X
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2020.10.053
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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