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Turbulence–flame interactions in lean premixed hydrogen: transition to the distributed burning regime

  • A. J. ASPDEN (a1), M. S. DAY (a1) and J. B. BELL (a1)
Abstract

The response of lean (ϕ ≤ 0.4) premixed hydrogen flames to maintained homogeneous isotropic turbulence is investigated using detailed numerical simulation in an idealised three-dimensional configuration over a range of Karlovitz numbers from 10 to 1562. In particular, a focus is placed on turbulence sufficiently intense that the flames can no longer be considered to be in the thin reaction burning regime. This transition to the so-called distributed burning regime is characterised through a number of diagnostics, and the relative roles of molecular and turbulent mixing processes are examined. The phenomenology and statistics of these flames are contrasted with a distributed thermonuclear flame from a related astrophysical study.

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Copyright
This is a work of the U.S. Government and is not subject to copyright protection in the United States.
Corresponding author
Email address for correspondence: AJAspden@lbl.gov
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Journal of Fluid Mechanics
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