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    Investigation of the turbulent flame structure and topology at different Karlovitz numbers using the tangential stretching rate index

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    2018_CnF_H2_Karlovitz_nonhighlighted.pdf
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    Type
    Article
    Authors
    Manias, Dimitris M.
    Tingas, Alexandros cc
    Hernandez Perez, Francisco
    Malpica Galassi, Riccardo cc
    Ciottoli, Pietro P. cc
    Valorani, Mauro cc
    Im, Hong G. cc
    KAUST Department
    Clean Combustion Research Center
    Computational Reacting Flow Laboratory (CRFL)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2018-11-30
    Online Publication Date
    2018-11-30
    Print Publication Date
    2019-02
    Permanent link to this record
    http://hdl.handle.net/10754/630124
    
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    Abstract
    Turbulent premixed flames at high Karlovitz numbers exhibit highly complex structures in different reactive scalar fields to the extent that the definition of the flame front in an unambiguous manner is not straightforward. This poses a significant challenge in characterizing the observable turbulent flame behaviour such as the flame surface density, turbulent burning velocity, and so on. Turbulent premixed flames are reactive flows involving physical and chemical processes interacting over a wide range of time scales. By recognizing the multi-scale nature of reactive flows, we analyze the topology and structure of two direct numerical simulation cases of turbulent H2/air premixed flames, in the thin reaction zone and distributed combustion regimes, using tools derived from the computational singular perturbation (CSP) method and augmented by the tangential stretching rate (TSR) analysis. CSP allows to identify the local time scale decomposition of the multi-scale problem in its slow and fast components, while TSR allows to identify the most energetic time scale during both the explosive and dissipative regime of the reactive flow dynamics together with the identification of the flame front in an unambiguous manner. Before facing the complexity of the turbulent flow regime, we carry out a preliminary analysis of a one-dimensional laminar premixed flame in view of highlighting similarities and differences between laminar and turbulent cases. Subsequently, it is shown that the TSR metric provides a reliable way to identify the turbulent flame topologies.
    Citation
    Manias DM, Tingas E-A, Hernández Pérez FE, Malpica Galassi R, Paolo Ciottoli P, et al. (2019) Investigation of the turbulent flame structure and topology at different Karlovitz numbers using the tangential stretching rate index. Combustion and Flame 200: 155–167. Available: http://dx.doi.org/10.1016/j.combustflame.2018.11.023.
    Sponsors
    This work was sponsored by competitive research funding from King Abdullah University of Science and Technology (KAUST). MV acknowledges the support of the Italian Ministry of University and Research (MIUR).
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2018.11.023
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S0010218018305042
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2018.11.023
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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