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    Experimental investigations on coherent flow structures in acoustically excited swirling flames using temporally-separated dual-plane Stereo-PIV

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    Type
    Article
    Authors
    ZHENG, Jianyi
    Wang, Sirui
    Yang, Zifeng cc
    Li, Lei
    Wang, Guoqing cc
    Gao, Yi
    Liu, Xunchen
    Qi, Fei
    KAUST Department
    Clean Combustion Research Center
    Physical Science and Engineering (PSE) Division
    Date
    2022-04-30
    Embargo End Date
    2024-04-30
    Permanent link to this record
    http://hdl.handle.net/10754/677907
    
    Metadata
    Show full item record
    Abstract
    A temporally-separated dual-plane stereoscopic particle image velocimetry (PIV) technique is utilized to investigate the dynamics of periodically-excited vortices in a swirling flame under four experimental conditions. The time-averaged results under the unexcited condition are analyzed to verify the accuracy of the method. For the excited conditions, Q criteria is used to extract and classify the vortex structures within the swirling flame. It is found that under different excitation frequencies of the same amplitude, the outer vortex rings (OVRs) and the inner vortex rings (IVRs) show opposite rotational characteristics. While the excitation frequency has little influence on the central vortices induced by the swirler, the amplitude does have a great influence on the development trajectory of the central vortices. Furthermore, the amplitude and phase of oscillation velocities in three directions are successfully decomposed by using sine curve fittings at each point. A periodic acceleration and deceleration process is observed only in the axial direction. Besides the acoustic wave, it is found that the vortex rings (both OVRs and IVRs) also contribute to the axial velocity oscillations.
    Citation
    Zheng, J., Wang, S., Yang, Z., Li, L., Wang, G., Gao, Y., Liu, X., & Qi, F. (2022). Experimental investigations on coherent flow structures in acoustically excited swirling flames using temporally-separated dual-plane Stereo-PIV. Experimental Thermal and Fluid Science, 136, 110673. https://doi.org/10.1016/j.expthermflusci.2022.110673
    Sponsors
    Supported by National Natural Science Foundation of China (52076137, 91941301) and National Science and Technology Major Project of China (2017-III-0004-0028).
    Publisher
    Elsevier BV
    Journal
    Experimental Thermal and Fluid Science
    DOI
    10.1016/j.expthermflusci.2022.110673
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0894177722000747
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.expthermflusci.2022.110673
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Clean Combustion Research Center

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