Study of a thermo-acoustic instability triggering in a low-swirl burner using simultaneous time-resolved acetone and OH-PLIF

Antoine Renaud, Takeshi Yokomori, Shigeru Tachibana

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A low-swirl burner operating in premixed mode with methane and air is studied using high-speed acetone and OH-PLIF and advanced post-processing methods. In a transient operating point where the equivalence ratio is slowly increased while keeping the bulk velocity constant, a thermo-acoustic instability is found to grow and generate large pressure fluctuations in the combustion chamber. The instability is maintained by bursts of flame in phase with the pressure fluctuation cycle. It is found that these bursts are amplified by the fact that the boundaries of the flame arms are fluctuating in phase. This phasing of the arms' boundaries is due to the change in flame speed coming from the increase of equivalence ratio.

Original languageEnglish
JournalProceedings of the Combustion Institute
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

acoustic instability
burners
Acetone
Fuel burners
acetone
flames
Acoustics
equivalence
bursts
Methane
Combustion chambers
combustion chambers
methane
Processing
Air
high speed
cycles
air
hydroxide ion

Keywords

  • DMD
  • Hilbert transform
  • Low swirl
  • Time-resolved

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

Cite this

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abstract = "A low-swirl burner operating in premixed mode with methane and air is studied using high-speed acetone and OH-PLIF and advanced post-processing methods. In a transient operating point where the equivalence ratio is slowly increased while keeping the bulk velocity constant, a thermo-acoustic instability is found to grow and generate large pressure fluctuations in the combustion chamber. The instability is maintained by bursts of flame in phase with the pressure fluctuation cycle. It is found that these bursts are amplified by the fact that the boundaries of the flame arms are fluctuating in phase. This phasing of the arms' boundaries is due to the change in flame speed coming from the increase of equivalence ratio.",
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T1 - Study of a thermo-acoustic instability triggering in a low-swirl burner using simultaneous time-resolved acetone and OH-PLIF

AU - Renaud, Antoine

AU - Yokomori, Takeshi

AU - Tachibana, Shigeru

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N2 - A low-swirl burner operating in premixed mode with methane and air is studied using high-speed acetone and OH-PLIF and advanced post-processing methods. In a transient operating point where the equivalence ratio is slowly increased while keeping the bulk velocity constant, a thermo-acoustic instability is found to grow and generate large pressure fluctuations in the combustion chamber. The instability is maintained by bursts of flame in phase with the pressure fluctuation cycle. It is found that these bursts are amplified by the fact that the boundaries of the flame arms are fluctuating in phase. This phasing of the arms' boundaries is due to the change in flame speed coming from the increase of equivalence ratio.

AB - A low-swirl burner operating in premixed mode with methane and air is studied using high-speed acetone and OH-PLIF and advanced post-processing methods. In a transient operating point where the equivalence ratio is slowly increased while keeping the bulk velocity constant, a thermo-acoustic instability is found to grow and generate large pressure fluctuations in the combustion chamber. The instability is maintained by bursts of flame in phase with the pressure fluctuation cycle. It is found that these bursts are amplified by the fact that the boundaries of the flame arms are fluctuating in phase. This phasing of the arms' boundaries is due to the change in flame speed coming from the increase of equivalence ratio.

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KW - Hilbert transform

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KW - Time-resolved

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