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Flame stability optimization of cavity primary air-jet form in an augmentor

Author

Listed:
  • Huang, Yakun
  • He, Xiaomin
  • Zhang, Huangwei
  • Zhu, Zhixin
  • Zhu, Huanyu

Abstract

A trapped vortex cavity with a radial V-gutter flameholder is adopted to expand the flame stability of an augmentor. The improvement of flame stabilization limits is achieved experimentally by replacing the traditional slotted air-jet with the discrete-hole air-jet. The atomization characteristics of the air-assisted multi-point injector and the numerical fluid-structure are conducted to explain the results. Results indicate that a remarkable enhancement of the flame stability with discrete-hole air-jet is obtained in all conditions, while the slotted air-jet for the cavity leads to a failed ignition at 343 K except for the Mach number of 0.3. As the same passing area of the air-jet, the larger the aperture of the discrete hole, the better the flame stabilization performance. An increasing trend of lean blowout equivalence ratio is contributed by the increased Mach number. Whereas, the Mach number growth will lead to a reduction of lean ignition equivalence ratio at 343 K and 473 K, and a downward parabola is observed at 573 K. Eventually, the optimal flame stability performance is achieved in by the larger discrete space distance, which promotes the fuel/air mixture with the help of the recirculation zones between discrete holes.

Suggested Citation

  • Huang, Yakun & He, Xiaomin & Zhang, Huangwei & Zhu, Zhixin & Zhu, Huanyu, 2022. "Flame stability optimization of cavity primary air-jet form in an augmentor," Energy, Elsevier, vol. 239(PA).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pa:s0360544221020491
    DOI: 10.1016/j.energy.2021.121801
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    References listed on IDEAS

    as
    1. Zhang, R.C. & Bai, N.J. & Fan, W.J. & Huang, X.Y. & Fan, X.Q., 2019. "Influence of flame stabilization and fuel injection modes on the flow and combustion characteristics of gas turbine combustor with cavity," Energy, Elsevier, vol. 189(C).
    2. Li, Mingyu & He, Xiaomin & Zhao, Yuling & Jin, Yi & Yao, Kanghong & Ge, Zhenghao, 2018. "Performance enhancement of a trapped-vortex combustor for gas turbine engines using a novel hybrid-atomizer," Applied Energy, Elsevier, vol. 216(C), pages 286-295.
    3. Zhao, Yuling & He, Xiaomin & Li, Mingyu, 2020. "Effect of mainstream forced entrainment on the combustion performance of a gas turbine combustor," Applied Energy, Elsevier, vol. 279(C).
    4. 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.
    5. Xing, Fei & Kumar, Arvind & Huang, Yue & Chan, Shining & Ruan, Can & Gu, Sai & Fan, Xiaolei, 2017. "Flameless combustion with liquid fuel: A review focusing on fundamentals and gas turbine application," Applied Energy, Elsevier, vol. 193(C), pages 28-51.
    6. Miao, Junjie & Fan, Yuxin & Wu, Weiqiu & Zhao, Shilong, 2021. "Effect of air-assistant on ignition and flame-holding characteristics in a cavity-strut based combustor," Applied Energy, Elsevier, vol. 283(C).
    7. Zhang, R.C. & Fan, W.J. & Xing, F. & Song, S.W. & Shi, Q. & Tian, G.H. & Tan, W.L., 2015. "Experimental study of slight temperature rise combustion in trapped vortex combustors for gas turbines," Energy, Elsevier, vol. 93(P2), pages 1535-1547.
    8. Jin, Yi & Li, Yefang & He, Xiaomin & Zhang, Jingyu & Jiang, Bo & Wu, Zejun & Song, Yaoyu, 2014. "Experimental investigations on flow field and combustion characteristics of a model trapped vortex combustor," Applied Energy, Elsevier, vol. 134(C), pages 257-269.
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