ISSN 0253-2778

CN 34-1054/N

Open AccessOpen Access JUSTC

Large eddy simulation of vortex breakdown bubble in the unconfined non-reactive swirling flow

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https://doi.org/10.3969/j.issn.0253-2778.2013.08.010
  • Received Date: 08 June 2013
  • Rev Recd Date: 22 July 2013
  • Publish Date: 31 August 2013
  • Large eddy simulation (LES) was applied to the non-reactive cases with medium swirl numbers (N29S054 and N29S045) of the Sydney swirl burner, and the instability mode of the vortex breakdown bubble (the downstream second recirculation zone) was investigated. The statistical moment obtained from LES results shows good overall agreement with experimental data. The vortex breakdown bubble (VBB) did not exhibit the spiral-type, and was not surrounded by the spiral precessing vortex core (PVC), which indicates that the VBB shows no distinct precession motion. The instantaneous velocity contours suggest the existence of cyclic collapse/contraction and expansion of VBB. The distinct peak of power spectrum density gives further evidence for periodic motion.
    Large eddy simulation (LES) was applied to the non-reactive cases with medium swirl numbers (N29S054 and N29S045) of the Sydney swirl burner, and the instability mode of the vortex breakdown bubble (the downstream second recirculation zone) was investigated. The statistical moment obtained from LES results shows good overall agreement with experimental data. The vortex breakdown bubble (VBB) did not exhibit the spiral-type, and was not surrounded by the spiral precessing vortex core (PVC), which indicates that the VBB shows no distinct precession motion. The instantaneous velocity contours suggest the existence of cyclic collapse/contraction and expansion of VBB. The distinct peak of power spectrum density gives further evidence for periodic motion.
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