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Experimental and numerical definition of the extreme heater locations in a closed-open standing wave thermoacoustic system

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  • Wu, Gang
  • Jin, Xiao
  • Li, Qiangtian
  • Zhao, He
  • Ahmed, I.R.
  • Fu, Jianqin

Abstract

In this work, experimental study of a close-open standing-wave thermoacoustic system with a heat source confined is performed first. By varying the axial location xf/L of the heat source, the thermoacoustic oscillation intensity is experimentally shown to be varied. Maximum-amplitude oscillations occur, as the heat source is axially placed at 0.4⩽xf/L⩽0.55. This indicates that the most ‘dangerous’ axial location of the heat source is close to the middle of the combustor. Furthermore, time-frequency analysis of the measured pressure signal reveals that the thermoacoustic system is nonlinear due to the presence of comparable amplitude peaks in the spectrum. To gain insights on the most ‘dangerous’ axial location and nonlinearity, and to validate our experimental findings, a 1D model of a closed-open standing-wave thermoacoustic system is developed. The effects of (1) the heat source location xf/L, (2) the number of eigenmodes N and (3) the mean temperature ratio T2/T1 across the heat source on the dynamics and transient stability behaviors of the standing-wave system are examined one at a time. It is found that the most ‘dangerous’ axial location of the heat source is approximately at xf/L=0.5. This is in good agreement with the results from our experimental measurement and the conventional modal analysis. In addition, it is shown that the most ‘dangerous’ heat source location is shifted by varying the downstream mean temperature. Similar finding is experimentally observed. Finally, Rayleigh index as an important stability indicator is defined and calculated to characterize the heat-to-sound coupling. The present work opens up new applicable way to produce maximum-amplitude standing-wave thermoacoustic oscillations in a practical engine system.

Suggested Citation

  • Wu, Gang & Jin, Xiao & Li, Qiangtian & Zhao, He & Ahmed, I.R. & Fu, Jianqin, 2016. "Experimental and numerical definition of the extreme heater locations in a closed-open standing wave thermoacoustic system," Applied Energy, Elsevier, vol. 182(C), pages 320-330.
    • Handle: RePEc:eee:appene:v:182:y:2016:i:c:p:320-330
    DOI: 10.1016/j.apenergy.2016.08.104
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    References listed on IDEAS

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    Cited by:

    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. Chen, Geng & Tang, Lihua & Mace, Brian & Yu, Zhibin, 2021. "Multi-physics coupling in thermoacoustic devices: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 146(C).
    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. Li, Xinyan & Huang, Yong & Zhao, Dan & Yang, Wenming & Yang, Xinglin & Wen, Huabing, 2017. "Stability study of a nonlinear thermoacoustic combustor: Effects of time delay, acoustic loss and combustion-flow interaction index," Applied Energy, Elsevier, vol. 199(C), pages 217-224.
    5. Wu, Gang & Lu, Zhengli & Pan, Weichen & Guan, Yiheng & Ji, C.Z., 2018. "Numerical and experimental demonstration of actively passive mitigating self-sustained thermoacoustic oscillations," Applied Energy, Elsevier, vol. 222(C), pages 257-266.
    6. Sun, Yuze & Rao, Zhuming & Zhao, Dan & Wang, Bing & Sun, Dakun & Sun, Xiaofeng, 2020. "Characterizing nonlinear dynamic features of self-sustained thermoacoustic oscillations in a premixed swirling combustor," Applied Energy, Elsevier, vol. 264(C).
    7. Zuo, Wei & E, Jiaqiang & Peng, Qingguo & Zhao, Xiaohuan & Zhang, Zhiqing, 2017. "Numerical investigations on a comparison between counterflow and coflow double-channel micro combustors for micro-thermophotovoltaic system," Energy, Elsevier, vol. 122(C), pages 408-419.
    8. 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.

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