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Ultra-lean blow-off dynamics of a holder-stabilized premixed flame in a preheated mesoscale combustor near laminar critical condition

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  • Wan, Jianlong
  • Zhao, Haibo

Abstract

The present work experimentally illustrates and analyzes the ultra-lean flame blow-off dynamics near laminar critical condition under the synergistic effect of heat and flow recirculation which exists in many practical combustors (such as aero-engine). The results indicate that the flame blow-off process can be divided into three stages at Reynolds number Re = 240. In the first stage, the flame initially becomes thinner over time. In the second stage, the residual flame with repetitive local extinction and re-ignition (RFRER) appears (the second stage), which is experimentally found for the first time for the methane/air premixed mixture of Lewis number Le = 1.0. The analysis indicates that the local extinction of the flame is mainly caused by the stretch effect on two sides. In the final stage, the residual flame with oscillation appears. The oscillating residual flame is finally carried convectively upstream and extinguishes within the recirculation zone as the present Lewis number effect is small. The analysis also indicates that the residual flame of hydrocarbon fuel cannot be maintained, but this issue can be solved via adding enough fast-diffusing species (such as hydrogen). This mechanism for suppressing or preventing the local extinction of the residual flame may be also suitable for the turbulent flames in many practical combustors. The present study provides the theoretical basis for predicting the flame status and suppressing the unstable flames at extreme operating conditions.

Suggested Citation

  • Wan, Jianlong & Zhao, Haibo, 2021. "Ultra-lean blow-off dynamics of a holder-stabilized premixed flame in a preheated mesoscale combustor near laminar critical condition," Energy, Elsevier, vol. 228(C).
    • Handle: RePEc:eee:energy:v:228:y:2021:i:c:s0360544221008768
    DOI: 10.1016/j.energy.2021.120627
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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. Huang, Yakun & He, Xiaomin & Jin, Yi & Zhu, Huanyu & Zhu, Zhixin, 2021. "Effect of non-uniform inlet profile on the combustion performance of an afterburner with bluff body," Energy, Elsevier, vol. 216(C).
    3. Shilong, Zhao & Yuxin, Fan, 2020. "Experimental and numerical study on fuel distribution and flame expansion of the enhanced flame holding devices," Energy, Elsevier, vol. 203(C).
    4. Wan, Jianlong & Zhao, Haibo, 2020. "Effect of thermal condition of solid wall on the stabilization of a preheated and holder-stabilized laminar premixed flame," Energy, Elsevier, vol. 200(C).
    5. Wan, Jianlong & Zhao, Haibo, 2018. "Thermal performance of solid walls in a mesoscale combustor with a plate flame holder and preheating channels," Energy, Elsevier, vol. 157(C), pages 448-459.
    6. Pan, Jianfeng & Zhang, Chenxin & Pan, Zhenhua & Wu, Di & Zhu, Yuejin & Lu, Qingbo & Zhang, Yi, 2020. "Investigation on the effect of bluff body ball on the combustion characteristics for methane/oxygen in micro combustor," Energy, Elsevier, vol. 190(C).
    7. 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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