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Vortex-dynamical interpretation of anti-phase and in-phase flickering of dual buoyant diffusion flames

Tao Yang1, Xi Xia1,2, and Peng Zhang1,*

  • 1Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
  • 2School of Mechanical Engineering, Shanghai Jiao Tong University, Minhang, Shanghai, People's Republic of China

  • *Corresponding author: pengzhang.zhang@polyu.edu.hk
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Phys. Rev. Fluids 4, 053202 – Published 22 May, 2019

DOI: https://doi.org/10.1103/PhysRevFluids.4.053202

Abstract

Anti-phase and in-phase flickering modes of dual buoyant diffusion flames were numerically investigated and theoretically analyzed in this study. Inspired by the flickering mechanism of a single buoyant diffusion flame, for which the deformation, stretching, or even pinch-off of the flame surface result from the formation and evolution of the toroidal vortices, we attempted to understand the anti-phase and in-phase flickering of dual buoyant diffusion flames from the perspective of vortex dynamics. The interaction between the inner-side shear layers of the two flames was identified to be responsible for the different flickering modes. Specifically, the transition between anti-phase and in-phase flickering modes can be predicted by a unified regime nomogram of the normalized flickering frequency versus a characteristic Reynolds number, which accounts for the viscous effect on vorticity diffusion between the two inner-side shear layers. Physically, the transition of the vortical structures from symmetric (in-phase) to staggered (anti-phase) in a dual-flame system can be interpreted as being similar to the mechanism causing flow transition in the wake of a bluff body and forming the Karman vortex street.

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Phys. Rev. Fluids 4, 053202– Published 22 May, 2019
  • Received 6 September 2018
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