Flame Annihilation Displacement Speed and Stretch Rate in Turbulent Premixed Flames

A Haghiri; M Talei; MJ Brear; ER Hawkes

Journal article

Flame Annihilation Displacement Speed and Stretch Rate in Turbulent Premixed Flames

A Haghiri, M Talei, MJ Brear, ER Hawkes

Flow, Turbulence and Combustion | SpringerLink | Published : 2020

DOI: 10.1007/s10494-019-00078-0

Abstract

This paper examines the dynamics of flame annihilation in turbulent premixed flames using a DNS dataset of Haghiri et al. (J. Fluid Mech. 843, 29 2018). Two theoretical frameworks are considered. The relative contributions of the reaction rate, normal diffusion and flame curvature to the flame displacement speed are first considered. A revised form of Markstein’s theory describing the displacement speed as a function of the local Karlovitz number is then used, including consideration of the relative importance of strain rate and curvature. Comparison of the statistics of flame annihilation to those of the entire flame surface suggests that this modified Markstein number might be sufficient t..

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University of Melbourne Researchers

Ali Haghiri Author Mechanical Engineering

Mohsen Talei Author Mechanical Engineering

Michael Brear Author Science

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Grants

Awarded by Australian Research Council

Funding Acknowledgements

This work was supported by the Australian Research Council (ARC) [grants DP120101830 and DE180100416] and the University of Melbourne through a Melbourne International Research Scholarship and a Melbourne International Fee Remission Scholarship. The research benefited from computational resources provided through the National Computational Merit Allocation Scheme (NCMAS) and the Pawsey Energy and Resources Scheme, supported by the Australian Government. The computational facilities supporting this project included the Australian NCI National Facility and the Pawsey Supercomputing Center.