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Reconciling turbulent burning velocity with flame surface area in small-scale turbulence

Published online by Cambridge University Press:  05 November 2018

G. V. Nivarti Open the ORCID record for G. V. Nivarti [Opens in a new window] ,
R. S. Cant  and
S. Hochgreb
G. V. Nivarti*
Affiliation:
University Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK
R. S. Cant
Affiliation:
University Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK
S. Hochgreb
Affiliation:
University Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK
*
†Email address for correspondence: [email protected]
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Abstract

A discrepancy between the enhancement in overall burning rate and the enhancement in flame surface area measured for high-intensity turbulence is addressed. In order to reconcile the two quantities, an additional contribution from the effective turbulent diffusivity is considered. This contribution is expected to arise in sufficiently intense turbulence from eddies smaller than the flamelet thickness. In the present work, the enhancement in diffusivity arising from these eddies is estimated based on a model energy spectrum; individual contributions from all turbulence length scales smaller the flamelet thickness are integrated over the corresponding portion of the spectrum. It is shown that diffusivity enhancement, estimated in this manner, is able to account for the measured discrepancy between the overall burning rate enhancement and flame surface area enhancement. The factor quantifying this discrepancy is formalized as a closed-form function of the Karlovitz number.

JFM classification

Mixing: Turbulent mixing Reacting Flows: Turbulent reacting flows Reacting Flows: Combustion
Type
JFM Rapids
Information
Journal of Fluid Mechanics , Volume 858 , 10 January 2019 , R1
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Copyright
© 2018 Cambridge University Press 

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