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Research Article

Effects of Variation of Flame Surface Area on Secondary Acoustic Instability in Downward-Propagating Premixed Flames

하향 전파하는 예혼합 화염의 이차 열음향 불안정성에 미치는 화염면적 변화의 영향

Sung Hwan Yoon1*
윤 성환1*
1Division of Marine Systems Engineering, Korea Maritime and Ocean University
1한국해양대학교 기관시스템공학부
* Corresponding Author
31 March 2020. pp. 48-55
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Abstract

The effects of varying flame surface area due to hydrodynamic instability on secondary acoustic instability in downward propagating flames were studied experimentally. To quantitatively control hydrodynamic instability, one of intrinsic combustion instabilities, CO2 laser irradiation technique was adopted. Because of the increase in flame surface area of the flame surface area artificially, the transition from primary acoustic instability to secondary acoustics instability occurred, and the occurrence time of secondary acoustic field became relatively shorter when the rate of variation in flame surface area was increased. However, the rate of variation in flame surface area and the wave number of corrugated structure were found to have little effect on the growth mechanism of secondary acoustic instability.

Keywords
Acoustic instability
Growth rate
Laser irradiation
Quarter wavelength resonator
Secondary acoustic instability

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Information
  • Publisher :The Korean Society Combustion
  • Publisher(Ko) :한국연소학회
  • Journal Title :Journal of The Korean Society Combustion
  • Journal Title(Ko) :한국연소학회지
  • Volume : 25
  • No :1
  • Pages :48-55
  • Received Date : 2020-01-21
  • Revised Date : 2020-01-22
  • Accepted Date : 2020-01-23
  • DOI :https://doi.org/10.15231/jksc.2020.25.1.048
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