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Parametric study of the slope confinement for passive control in a centrally-staged swirl burner

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  • Song, Heng
  • Han, Xiao
  • Su, Tong
  • Xue, Xin
  • Zhang, Chi
  • Sung, Chih-Jen

Abstract

Lean premixed centrally-staged combustion holds the potential of meeting low-emission requirements, but it is known to be susceptible to thermoacoustic instabilities. A passive control method, using slope confinements has been demonstrated previously to be efficacy in suppressing thermoacoustic instabilities. Recognizing that the detailed flow features and the role of slope confinement structures associated with these thermoacoustic instabilities have not been well understood, the present study aims at revealing the suppressive mechanisms and assessing the suppressive efficacy of different slope confinements by measuring flow fields and conducting experiments with varying geometric parameters, including slope step height and slope angle. It is found that the slope confinements investigated have a general suppressive effect on thermoacoustic oscillations, which can be attributed to the limited vortex shedding from the dump plane. The slope confinement with smaller slope step height and slope angle is shown to have better performance on combustion stability. However, oscillations still occur in slope confinements with relatively large slope angle and step height. A qualitative relationship between the oscillation amplitude and the characteristic scale of corner recirculation zone is then established from the flow separation aspects. The present work provides insights into practical confinement design for passive control.

Suggested Citation

  • Song, Heng & Han, Xiao & Su, Tong & Xue, Xin & Zhang, Chi & Sung, Chih-Jen, 2021. "Parametric study of the slope confinement for passive control in a centrally-staged swirl burner," Energy, Elsevier, vol. 233(C).
    • Handle: RePEc:eee:energy:v:233:y:2021:i:c:s0360544221014365
    DOI: 10.1016/j.energy.2021.121188
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    References listed on IDEAS

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    1. Wu, Gang & Lu, ZhengLi & Guan, Yiheng & Li, Yuelin & Ji, C.Z., 2018. "Characterizing nonlinear interaction between a premixed swirling flame and acoustics: Heat-driven acoustic mode switching and triggering," Energy, Elsevier, vol. 158(C), pages 546-554.
    2. Wu, Gang & Lu, Zhengli & Pan, Weichen & Guan, Yiheng & Li, Shihuai & Ji, C.Z., 2019. "Experimental demonstration of mitigating self-excited combustion oscillations using an electrical heater," Applied Energy, Elsevier, vol. 239(C), pages 331-342.
    3. Wu, Gang & Xu, Xiao & Li, S. & Ji, C., 2019. "Experimental studies of mitigating premixed flame-excited thermoacoustic oscillations in T-shaped Combustor using an electrical heater," Energy, Elsevier, vol. 174(C), pages 1276-1282.
    4. Song, Heng & Lin, Yuzhen & Han, Xiao & Yang, Dong & Zhang, Chi & Sung, Chih-Jen, 2020. "The thermoacoustic instability in a stratified swirl burner and its passive control by using a slope confinement," Energy, Elsevier, vol. 195(C).
    5. Sahebjamei, M. & Amani, E. & Nobari, M.R.H., 2019. "Numerical analysis of radial and angular stratification in turbulent swirling flames," Energy, Elsevier, vol. 173(C), pages 523-539.
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    Cited by:

    1. Wang, Xinyao & Han, Xiao & Sung, Chih-Jen, 2023. "Transitions of thermoacoustic modes and flame dynamics in a centrally-staged swirl combustor," Energy, Elsevier, vol. 263(PC).

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