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    Temperature and water measurements in flames using 1064 nm Laser-Induced Grating Spectroscopy (LIGS)

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    1-s2.0-S0010218019301610-main.pdf
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    1.287Mb
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    Description:
    Accepted Manuscript
    Embargo End Date:
    2021-05-03
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    Type
    Article
    Authors
    De Domenico, Francesca
    Guiberti, Thibault
    Hochgreb, Simone
    Roberts, William L. cc
    Magnotti, Gaetano cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    high-pressure combustion (HPC) Research Group
    Date
    2019-05-03
    Online Publication Date
    2019-05-03
    Print Publication Date
    2019-07
    Permanent link to this record
    http://hdl.handle.net/10754/652838
    
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    Abstract
    Laser-Induced Grating Spectroscopy (LIGS) is applied to premixed CH4/air laminar flat flames under operating pressures of 1 to 6 bar. For the first time, temperature and water concentration have been acquired simultaneously in a reacting flow environment using LIGS. A 1064 nm pulsed laser is used as pump to generate a temporary stationary intensity grating in the probe volume. Water molecules in the flame products absorb the laser energy and generate a thermal grating if sufficiently high energies are delivered by the laser pulses, here more than 100 mJ per pulse. Such energies allow the electric field to polarize the dielectric medium, resulting in a detectable electrostrictive grating as well. This creates LIGS signals containing both the electrostrictive and the thermal contributions. The local speed of sound is derived from the oscillation frequency of LIGS signals, which can be accurately measured from the single shot power spectrum. Data show that the ratio between the electrostrictive and the thermal peak intensities is an indicator of the local water concentration. The measured values of speed of sound, temperature, and water concentration in the flames examined compare favorably with flame simulations with Chemkin, showing an estimated accuracy of 0.5 to 2.5% and a precision of 1.4–2%. These results confirm the potential for 1064 nm LIGS-based thermometry for high-precision temperature measurements of combustion processes.
    Citation
    De Domenico F, Guiberti TF, Hochgreb S, Roberts WL, Magnotti G (2019) Temperature and water measurements in flames using 1064 nm Laser-Induced Grating Spectroscopy (LIGS). Combustion and Flame 205: 336–344. Available: http://dx.doi.org/10.1016/j.combustflame.2019.04.016.
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). Francesca De Domenico's internship at KAUST University was fully founded by the KAUST Visiting Students Program. Francesca De Domenico is supported by the Honorary Vice-Chancellor's Award and a Qualcomm/ DTA Studentship (University of Cambridge). The authors are grateful to Dr. Benjamin A. O. Williams and Prof. Paul Ewart for valuable advice, developed under a previous EPSRC project EP/K02924X. The help of Anthony Bennet with the pressure vessel was highly appreciated.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2019.04.016
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S0010218019301610
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2019.04.016
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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