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

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...

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Bibliographic Details
Published in:Journal of fluid mechanics Vol. 680; pp. 287 - 320
Main Authors: ASPDEN, A. J., DAY, M. S., BELL, J. B.
Format: Journal Article
Language:English
Published: Cambridge, UK Cambridge University Press 10.08.2011
Subjects:
Applied sciences
Combustion
Combustion of gaseous fuels
Combustion. Flame
Computational fluid dynamics
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fluid flow
Fluid mechanics
Hydrogen
Isotropic turbulence
Mixing processes
Simulation
Statistics
Theoretical studies. Data and constants. Metering
Turbulence
Turbulent flow
Turbulent mixing
turbulent reacting flows
turbulence simulation
flames
ISSN:0022-1120, 1469-7645
Online Access:Get full text
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Summary: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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ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2011.164