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Acoustic and heat release signatures for swirl assisted distributed combustion

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  • Khalil, Ahmed E.E.
  • Gupta, Ashwani K.

Abstract

The acoustic signal and heat release fluctuations are examined from a swirl combustor using methane as the fuel. The focus was on flame stability and noise emission that have direct relevance in further developing distributed combustion for gas turbine applications and oxy-fuel combustion. Three regimes are examined in this paper, the first being a swirl mode at equivalence ratios between 0.9 and 0.55. The second one being distributed combustion, achieved through N2/CO2 dilution to reach oxygen concentration below 15%, fostering distributed reaction. The third was oxy-fuel flame using increased amounts of CO2 dilution to reach distributed reaction. For the first case, lowering the equivalence ratio led to a reduction in the peak sound pressure level around 500Hz and a decrease in heat release fluctuations. For all the equivalence ratios, close coupling between acoustic signature and heat release fluctuations existed around 200Hz. Distributed combustion, achieved at oxygen concentration below 15%, showed a much lower peak sound pressure levels at the 500Hz range with no coupling between heat release fluctuations and acoustic signal, outlining the flame stability at this regime. Also, the noise emission levels were significantly reduced under this mode. For the third regime, increase in CO2 dilution resulted in high heat release fluctuations and an unstable flame which oscillated between two different flame modes, a feature that did not exist in the first two regimes. Further increase in CO2 led to achieving distributed reaction and a much more stable flame as compared to its oscillatory behavior at lower CO2 amounts, along with reduced noise emission levels. This outlines the possibility of achieving distributed combustion in a stable manner via CO2 dilution in oxy-fuel flames.

Suggested Citation

  • Khalil, Ahmed E.E. & Gupta, Ashwani K., 2017. "Acoustic and heat release signatures for swirl assisted distributed combustion," Applied Energy, Elsevier, vol. 193(C), pages 125-138.
    • Handle: RePEc:eee:appene:v:193:y:2017:i:c:p:125-138
    DOI: 10.1016/j.apenergy.2017.02.030
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    References listed on IDEAS

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    1. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2015. "Thermal field investigation under distributed combustion conditions," Applied Energy, Elsevier, vol. 160(C), pages 477-488.
    2. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2017. "The role of CO2 on oxy-colorless distributed combustion," Applied Energy, Elsevier, vol. 188(C), pages 466-474.
    3. Khalil, Ahmed E.E. & Arghode, Vaibhav K. & Gupta, Ashwani K., 2013. "Novel mixing for ultra-high thermal intensity distributed combustion," Applied Energy, Elsevier, vol. 105(C), pages 327-334.
    4. Arghode, Vaibhav K. & Gupta, Ashwani K., 2010. "Effect of flow field for colorless distributed combustion (CDC) for gas turbine combustion," Applied Energy, Elsevier, vol. 87(5), pages 1631-1640, May.
    5. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2011. "Swirling distributed combustion for clean energy conversion in gas turbine applications," Applied Energy, Elsevier, vol. 88(11), pages 3685-3693.
    6. Nemitallah, Medhat A. & Habib, Mohamed A., 2013. "Experimental and numerical investigations of an atmospheric diffusion oxy-combustion flame in a gas turbine model combustor," Applied Energy, Elsevier, vol. 111(C), pages 401-415.
    7. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2015. "Internal entrainment effects on high intensity distributed combustion using non-intrusive diagnostics," Applied Energy, Elsevier, vol. 160(C), pages 467-476.
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    Cited by:

    1. Roy, Rishi & Gupta, Ashwani K., 2022. "Data-driven prediction of flame temperature and pollutant emission in distributed combustion," Applied Energy, Elsevier, vol. 310(C).
    2. 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.
    3. 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.
    4. Hidegh, Gyöngyvér & Csemány, Dávid & Vámos, János & Kavas, László & Józsa, Viktor, 2021. "Mixture Temperature-Controlled combustion of different biodiesels and conventional fuels," Energy, Elsevier, vol. 234(C).
    5. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2017. "Flame fluctuations in Oxy-CO2-methane mixtures in swirl assisted distributed combustion," Applied Energy, Elsevier, vol. 204(C), pages 303-317.
    6. Sun, Yuze & Zhao, Dan & Ni, Siliang & David, Tim & Zhang, Yang, 2020. "Entropy and flame transfer function analysis of a hydrogen-fueled diffusion flame in a longitudinal combustor," Energy, Elsevier, vol. 194(C).
    7. 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).
    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.
    9. Shakeel, Mohammad Raghib & Sanusi, Yinka S. & Mokheimer, Esmail M.A., 2018. "Numerical modeling of oxy-methane combustion in a model gas turbine combustor," Applied Energy, Elsevier, vol. 228(C), pages 68-81.
    10. Zhang, Wei & Chen, Zhaohui & Duan, Qiwang & Jiang, Qianyu, 2021. "Visual test and evolutionary analysis of flow fields in cylinder of helical intake port diesel engine," Energy, Elsevier, vol. 223(C).
    11. Roy, Rishi & Gupta, Ashwani K., 2023. "Performance enhancement of swirl-assisted distributed combustion with hydrogen-enriched methane," Applied Energy, Elsevier, vol. 338(C).

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