Multiple flame-flame interactions in premixed combustion are investigated using
Direct Numerical Simulations of twin turbulent V-flames for a range of turbulence intensities
and length scales. Interactions are identified using a novel Automatic Feature
Extraction (AFE) technique, based on data registration using the Dual-Tree Complex
Wavelet Transform. Information on the time, position and type of interactions, and
their influence on the flame area is extracted using AFE. Characteristic length and
time scales for the interactions are identified. The effect of interactions on the flame
brush is quantified through a global stretch rate, defined as the sum of flamelet stretch
and interaction stretch contributions. The effects of each interaction type are discussed.
It is found that the magnitude of the fluctuations in flamelet and interaction stretch are
comparable, and a qualitative sensitivity to turbulence length scale is found for one
interaction type. Implications for modelling are discussed.The authors would like to thank Professor R. S. Cant for the use of SENGA2. EPSRC
funding through grant number EP/F028741/1, and funding from Rolls-Royce is
acknowledged.This is an Accepted Manuscript of an article published by Taylor & Francis in Combustion Science and Technology on 16 January 2013, available online: http://wwww.tandfonline.com/10.1080/00102202.2012.713413
