Volume 35 Issue 8
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YU Xiao, ZHAO Xiaoyao, MA Kang. Characteristics of premixed swirling tubular flame under acoustics perturbation,[J]. Journal of Aerospace Power, 2020, 35(8): 1655-1663. doi: 10.13224/j.cnki.jasp.2020.08.010
Citation: YU Xiao, ZHAO Xiaoyao, MA Kang. Characteristics of premixed swirling tubular flame under acoustics perturbation,[J]. Journal of Aerospace Power, 2020, 35(8): 1655-1663. doi: 10.13224/j.cnki.jasp.2020.08.010
shu

Characteristics of premixed swirling tubular flame under acoustics perturbation,

doi: 10.13224/j.cnki.jasp.2020.08.010
  • 1.

    School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China

  • 2.

    Research Institute of Collaborative Innovation of Military-Civilian Integration,North University of China,Taiyuan 030051,China

  • Received Date: 2020-01-23
  • Publish Date: 2020-08-28
    Abstract
  • To investigate the combustion instability of the premixed swirling tubular flame, the responses characteristics of methane/air premixed flames to longitudinal acoustic field was experimentally studied with different air volume flow rates and methane equivalent ratios. The dynamic response range of flame to different acoustic frequencies was revealed,and the variation of flame structure,acoustic pressure and OH* fluctuations under acoustics perturbation were studied. The results showed that the flame presented the low-pass filtering characteristic, demonstrating very weak response to the high acoustic frequency. For middle and low acoustic frequency, the flame was forced to oscillate at the same frequency, and even quenched at a lower acoustic frequency. In addition, the low-pass filtering behaviors were slightly affected by the flow rate and equivalent ratio. According to the calculated extinction strain rate, near lean extinction limit (eg, equivalence ratio equaling to 065), the flame was much sensitive to middle acoustic frequency owing to low extinction strain rate, generally presenting flame lift-off.

     

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