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Numerical Study of Hydrogen Auto-Ignition Process in an Isotropic and Anisotropic Turbulent Field

Author

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  • Agnieszka Wawrzak

    (Faculty of Mechanical Engineering and Computer Science, Czestochowa University of Technology, Armii Krajowej 21, 42-201 Czestochowa, Poland)

  • Artur Tyliszczak

    (Faculty of Mechanical Engineering and Computer Science, Czestochowa University of Technology, Armii Krajowej 21, 42-201 Czestochowa, Poland)

Abstract

The physical mechanisms underlying the dynamics of the flame kernel in stationary isotropic and anisotropic turbulent field are studied using large eddy simulations (LES) combined with a pdf approach method for the combustion model closure. Special attention is given to the ignition scenario, ignition delay, size and shape of the flame kernel among different turbulent regimes. Different stages of ignition are analysed for various levels of the initial velocity fluctuations and turbulence length scales. Impact of these parameters is found small for the ignition delay time but turns out to be significant during the flame kernel propagation phase and persists up to the stabilisation stage. In general, it is found that in the isotropic conditions, the flame growth and the rise of the maximum temperature in the domain are more dependent on the initial fluctuations level and the length scales. In the anisotropic regimes, these parameters have a substantial influence on the flame only during the initial phase of its development.

Suggested Citation

  • Agnieszka Wawrzak & Artur Tyliszczak, 2021. "Numerical Study of Hydrogen Auto-Ignition Process in an Isotropic and Anisotropic Turbulent Field," Energies, MDPI, vol. 14(7), pages 1-17, March.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:7:p:1869-:d:525575
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    References listed on IDEAS

    as
    1. Lijia Zhong & Changwen Liu, 2019. "Numerical Analysis of End-Gas Autoignition and Pressure Oscillation in a Downsized SI Engine Using Large Eddy Simulation," Energies, MDPI, vol. 12(20), pages 1-20, October.
    2. Lei Zhou & Xiaojun Zhang & Lijia Zhong & Jie Yu, 2020. "Effects of Flame Propagation Velocity and Turbulence Intensity on End-Gas Auto-Ignition in a Spark Ignition Gasoline Engine," Energies, MDPI, vol. 13(19), pages 1-23, September.
    3. Łukasz Kuban & Jakub Stempka & Artur Tyliszczak, 2021. "Numerical Analysis of the Combustion Dynamics of Passively Controlled Jets Issuing from Polygonal Nozzles," Energies, MDPI, vol. 14(3), pages 1-18, January.
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    Cited by:

    1. Wawrzak, Agnieszka & Caban, Lena & Tyliszczak, Artur & Mastorakos, Epaminondas, 2024. "Numerical analysis of turbulent nitrogen-diluted hydrogen flames stabilised by star-shaped bluff bodies," Applied Energy, Elsevier, vol. 364(C).

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