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Acoustic Triggering of Combustion Instability in a Swirling Flame: An Experimental Study

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  • Yunpeng Liu

    (College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
    Shenyang Aero Engine Research Institute, Aero Engine Corporation of China, Shenyang 110066, China)

  • Yingwen Yan

    (College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)

  • Shoutang Shang

    (Shenyang Aero Engine Research Institute, Aero Engine Corporation of China, Shenyang 110066, China)

  • Hongyu Ma

    (Shenyang Aero Engine Research Institute, Aero Engine Corporation of China, Shenyang 110066, China)

Abstract

Combustion instability is a common thermoacoustic coupling problem in combustion systems, and the pressure oscillations generated inevitably damage the combustion system. Studying the mechanism of combustion instability, especially the triggering problem of combustion instability, is particularly important for understanding combustion instability. This article adopts experimental research methods. The flame transfer function and flame describing function governing pressure pulsation were hereby measured to study the effect of heat release rate fluctuation on acoustic disturbance. By triggering combustion instability through ignition, the growth process of combustion instability was also studied. The results showed that flame pulsation amplitude shows a complex curvature when the frequency is lower than 200 Hz, while the growth rate of pulsation amplitude monotonically decreases as frequencies increase above 200 Hz. According to the considerable self−excited combustion instability tests, the oscillation amplitudes in the limit cycle state are generally greater than 0.4, while the pressure amplitudes in the limited state are less than 0.2, thus verifying the concept of a trigger threshold for low−frequency oscillation. In addition, analysis of the growth rate, the pressure and the attractor of the heat release pulsation observed after the triggering of combustion instability reveals that the triggering of combustion instability is a gradual coupling process between oscillation pressure and heat release rate pulsation.

Suggested Citation

  • Yunpeng Liu & Yingwen Yan & Shoutang Shang & Hongyu Ma, 2023. "Acoustic Triggering of Combustion Instability in a Swirling Flame: An Experimental Study," Energies, MDPI, vol. 16(14), pages 1-20, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:14:p:5568-:d:1200639
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    References listed on IDEAS

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    1. Zhang, Zhiguo & Zhao, Dan & Ni, Siliang & Sun, Yuze & Wang, Bing & Chen, Yong & Li, Guoneng & Li, S., 2019. "Experimental characterizing combustion emissions and thermodynamic properties of a thermoacoustic swirl combustor," Applied Energy, Elsevier, vol. 235(C), pages 463-472.
    2. Zhu, Rongjun & Pan, Deng & Ji, Chenzhen & Zhu, Tong & Lu, Pengpeng & Gao, Han, 2020. "Combustion instability analysis on a partially premixed swirl combustor by thermoacoustic experiments and modeling," Energy, Elsevier, vol. 211(C).
    3. Joo, Seongpil & Choi, Jongwun & Lee, Min Chul & Kim, Namkeun, 2021. "Prognosis of combustion instability in a gas turbine combustor using spectral centroid & spread," Energy, Elsevier, vol. 224(C).
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