Effects of laminar burning velocity to friction velocity ratio on turbulent premixed flame-wall interaction within turbulent boundary layers

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Abstract
Direct numerical simulation of flame-wall interaction (FWI) for two flame configurations under different laminar burning velocity to nonreacting wall friction velocity ratio, S L / u τ NR , have been performed. The first configuration considered is a V-flame in a turbulent channel flow with isothermal inert walls and represents oblique wall interaction. The second configuration is representative of head-on interaction (HOI) of a planar flame interacting with a wall in a fully developed turbulent boundary layer. In the case of the V-flame with S L / u τ NR = 0.4 , a smaller flame angle is obtained when compared with that of the V-flame with S L / u τ NR = 0.7 . This is a consequence of the differences in the turbulent burning velocities between the two V-flame cases, where the case with S L / u τ NR = 0.4 has a lower turbulent burning velocity when compared with that of the case with S L / u τ NR = 0.7 . By contrast, the ratio of turbulent to laminar burning velocity is higher for the S L / u τ NR = 0.4 HOI case when compared to the corresponding HOI case with S L / u τ NR = 0.7 . The flame orientations with respect to the streamwise component of velocity and wall-normal direction in addition to the S L / u τ NR values have been found to have a significant impact on the variations of wall heat flux, wall shear stress, and wall friction velocity in premixed FWI within turbulent boundary layers. The behaviors of nondimensional streamwise velocity, u + , and nondimensional temperature using wall units, T + , have also been investigated for different S L / u τ NR ratios and it is found that the standard log-law profiles in the case of u + and T + are not valid for the two configurations and the two S L / u τ NR ratios considered. Published by the American Physical Society 2024
Funding Information
  • Engineering and Physical Sciences Research Council (EP/V003534/1)
  • Newcastle University

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