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The effects of non-unity lewis numbers on turbulent premixed flame interactions in a twin V-flame configuration


Type

Article

Change log

Authors

Dunstan, TD 
Swaminathan, N 
Bray, KNC 
Kingsbury, NG 

Abstract

The influence of Lewis number on turbulent premixed flame interactions is investigated using Automatic Feature Extraction (AFE) applied to high-resolution flame simulation data. Premixed turbulent twin V-flames under identical turbulence conditions are simulated at global Lewis numbers of 0.4, 0.8, 1.0 and 1.2. Information on the position, frequency and magnitude of the interactions is compared, and the sensitivity of the results to sample interval is discussed. It is found that both the frequency and magnitude of normal type interactions increases with decreasing Lewis number. Counter-normal type interactions become more likely as the Lewis number increases. The variation in both the frequency and the magnitude of the interactions is found to be caused by large-scale changes in flame wrinkling resulting from differences in the thermo-diffusive stability of the flames. During flame interactions thermo-diffusive effects are found to be insignificant due to the separation of time scales.

Description

Keywords

Data registration, Flame stretch, Flame surface density, Turbulent flame modeling

Journal Title

Combustion Science and Technology

Conference Name

Journal ISSN

0010-2202
1563-521X

Volume Title

185

Publisher

Informa UK Limited
Sponsorship
Engineering and Physical Sciences Research Council (EP/F028741/1)
EPSRC funding through grant number EP/F028741/1, and funding from Rolls-Royce is acknowledged.