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Numerical Simulation Study on the Dynamics of Bluff-Body Flames under Oxygen-Lean Conditions

Author

Listed:
  • Fuquan Deng

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
    Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong SAR 999077, China)

  • Minwei Zhao

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Shunchuang Qin

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Zhaokun Wang

    (Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong SAR 999077, China)

  • Yongliang Xie

    (School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China)

  • Hongtao Zheng

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Xiao Liu

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Feng Zhang

    (College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China)

Abstract

As modern aeroengine combustors advance towards high temperatures, afterburners are inevitably affected by diminished oxygen content in incoming flows, thus affecting combustion efficiency, instability, and flammability limits. In this study, the dynamic combustion characteristics of V-shaped bluff body-stabilised diffusion flames were investigated using a large eddy simulation method with an oxygen mass fraction range of 14–23% and temperatures ranging from 900 to 1100 K. The results show the significant effects of oxygen content and inflow temperature on the flame/flow behaviours downstream of the bluff-body flame holder. In a separated shear layer, two distinct modes of flow/flame shedding are observed when varying the oxygen content and inflow temperature. The results show that BVK instability governs the far-field wake flow/flame features, whereas the oxygen concentration and temperature significantly affect their oscillation amplitudes. In addition, variations in the incoming oxygen content and temperature shift the axial position of the transition from KH instability to BVK instability. Finally, a spectral analysis is conducted to investigate the characteristics of pressure and heat release pulsations under different scenarios. This study highlights the importance of oxygen content on the combustion dynamics of bluff body-stabilised diffusion flames at various temperatures, which is essential for optimising combustion efficiency and stability in practical applications.

Suggested Citation

  • Fuquan Deng & Minwei Zhao & Shunchuang Qin & Zhaokun Wang & Yongliang Xie & Hongtao Zheng & Xiao Liu & Feng Zhang, 2023. "Numerical Simulation Study on the Dynamics of Bluff-Body Flames under Oxygen-Lean Conditions," Energies, MDPI, vol. 17(1), pages 1-19, December.
    • Handle: RePEc:gam:jeners:v:17:y:2023:i:1:p:142-:d:1308181
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    References listed on IDEAS

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    1. Zhang, R.C. & Huang, X.Y. & Fan, W.J. & Bai, N.J., 2019. "Influence of injection mode on the combustion characteristics of slight temperature rise combustion in gas turbine combustor with cavity," Energy, Elsevier, vol. 179(C), pages 603-617.
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