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    Time-resolved temperature measurements in a rapid compression machine using quantum cascade laser absorption in the intrapulse mode

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    Type
    Article
    Authors
    Nasir, Ehson Fawad 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
    2016-07-16
    Online Publication Date
    2016-07-16
    Print Publication Date
    2017
    Permanent link to this record
    http://hdl.handle.net/10754/621766
    
    Metadata
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    Abstract
    A temperature sensor based on the intrapulse absorption spectroscopy technique has been developed to measure in situ temperature time-histories in a rapid compression machine (RCM). Two quantum-cascade lasers (QCLs) emitting near 4.55μm and 4.89μm were operated in pulsed mode, causing a frequency "down-chirp" across two ro-vibrational transitions of carbon monoxide. The down-chirp phenomenon resulted in large spectral tuning (δν ∼2.8cm-1) within a single pulse of each laser at a high pulse repetition frequency (100kHz). The wide tuning range allowed the application of the two-line thermometry technique, thus making the sensor quantitative and calibration-free. The sensor was first tested in non-reactive CO-N2 gas mixtures in the RCM and then applied to cases of n-pentane oxidation. Experiments were carried out for end of compression (EOC) pressures and temperatures ranging 9.21-15.32bar and 745-827K, respectively. Measured EOC temperatures agreed with isentropic calculations within 5%. Temperature rise measured during the first-stage ignition of n-pentane is over-predicted by zero-dimensional kinetic simulations. This work presents, for the first time, highly time-resolved temperature measurements in reactive and non-reactive rapid compression machine experiments. © 2016 Elsevier Ltd.
    Citation
    Nasir EF, Farooq A (2016) Time-resolved temperature measurements in a rapid compression machine using quantum cascade laser absorption in the intrapulse mode. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2016.07.010.
    Sponsors
    Clean Combustion Research Center
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2016.07.010
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2016.07.010
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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