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Transitions of thermoacoustic modes and flame dynamics in a centrally-staged swirl combustor

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  • Wang, Xinyao
  • Han, Xiao
  • Sung, Chih-Jen

Abstract

In the start-up process of practical gas turbine applications, the modulation of operating condition, especially the variation of global equivalence ratios (ϕglo), could cause the variations of stability regimes. The above process is accompanied by the increase of total air flow rates (ṁair) when approaching the stable operation condition, and thus the effect of this parameter should also be considered in the operating condition modulation process. This work presents an experimental investigation into the transitions of thermoacoustic modes and flame dynamics in a centrally-staged swirl combustor over a range of ϕglo and ṁair. The present thermoacoustic system exhibits two transitions of thermoacoustic modes with ϕglo variation, showing distinct characteristics of pressure oscillation (p′) and flame structures. To further explore the detailed variation of p′ characteristics and its link to flame dynamics during two transitions, a nonlinear dynamic analysis of p′ including its phase and recurrence plots as well as a proper orthogonal decomposition (POD) study have been conducted. The thermoacoustic network analysis and local Rayleigh index analysis have clarified the mode transition mechanism with varying ϕglo and ṁair. The present results can provide a guideline for quantifying the stability regimes of fuel-flexible combustors during the operating condition modulation processes.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pc:s0360544222026998
    DOI: 10.1016/j.energy.2022.125813
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    References listed on IDEAS

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    1. Wang, Xinyao & Han, Meng & Han, Xiao & Chi Zhang, & Sung, Chih-Jen, 2021. "Flame structures and thermoacoustic instabilities of centrally-staged swirl flames operating in different partially-premixed modes," Energy, Elsevier, vol. 236(C).
    2. 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).
    3. Zhang, Zhihao & Liu, Xiao & Gong, Yaozhen & Yang, Yang & Tang, Zijia & Liu, Gang & Deng, Fuquan & Yang, Jialong & Zheng, Hongtao, 2020. "Experimental study of stratified swirl flame dynamics in a model gas turbine combustor," Energy, Elsevier, vol. 211(C).
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