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    Five kHz thermometry in turbulent spray flames using chirped-probe-pulse femtosecond CARS, part II: Structure of reaction zones

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    Type
    Article
    Authors
    Lowe, Albyn
    Thomas, Levi M. cc
    Satija, Aman
    Lucht, Robert P.
    Masri, Assaad R.
    KAUST Grant Number
    1975-01
    Date
    2019-01-22
    Permanent link to this record
    http://hdl.handle.net/10754/678658
    
    Metadata
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    Abstract
    Temperature was measured in turbulent spray flames of ethanol and acetone stabilized on the piloted Sydney Needle Spray Burner (SYNSBURNTM) using single-laser-shot, chirped-probe-pulse femtosecond coherent anti-Stokes Raman spectroscopy (CPP-fs-CARS) with a repetition rate of 5 kHz. The burner features air-blast atomization of liquid injected from a needle that can be translated by a length Lr within a co-flowing air stream so that piloted spray flames ranging from dilute to dense can be studied. Part I of these investigations has reported on the CPP-fs-CARS technique and extensive details of data processing methodology. Part II is concerned with the structure of the reaction zones at different spray loadings and for different departures from blow-off. While not performed simultaneously, measurements of the size distribution of liquid fragments are also reported and discussed in conjunction with the measured temperature. Measured probability density functions of temperature show that for flames with the same liquid loading but different recess lengths, Lr, the near-field spray structure that forms upstream of x/D = 10 affects flame structure and stability further downstream. As the spray exiting the burner becomes denser, with a higher proportion of ligaments and ‘irregular’ shaped objects, the entrainment of hot pilot gases into the spray envelope is affected, hence changing the rates of vaporization and subsequent combustion. The reported results will also form a useful platform for validating sub-models of atomization and combustion in turbulent, dilute to dense spray flames.
    Citation
    Lowe, A., Thomas, L. M., Satija, A., Lucht, R. P., & Masri, A. R. (2019). Five kHz thermometry in turbulent spray flames using chirped-probe-pulse femtosecond CARS, part II: Structure of reaction zones. Combustion and Flame, 200, 417–432. doi:10.1016/j.combustflame.2018.10.034
    Sponsors
    The University of Sydney Combustion Group is supported by the Australian Research Council. The Department of Mechanical Engineering at Purdue University was supported by a fellowship from the Purdue Military Research Initiative. Funding was provided by the U.S. Department of Energy, Division of Chemical Sciences, Geosciences and Biosciences, Grant No. (DE-FG02-03ER15391) and by the King Abdullah University of Science and Technology, CCF subaward (No. 1975-01).
    Publisher
    Elsevier BV
    Journal
    COMBUSTION AND FLAME
    DOI
    10.1016/j.combustflame.2018.10.034
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0010218018304681
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2018.10.034
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