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Experimental investigation of thermal protection performance of bluff-body flameholder in augmented combustor under air jet cooling

Author

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  • Chen, Yuqian
  • Fan, Yuxin
  • Han, Qixiang

Abstract

The wall temperature distribution and cooling effectiveness are crucial characteristics for evaluating air-cooled flameholder. Previous works show significantly changed flow and flame features in the near-wake region when inhaled cooling air jets, indicating that the flame and wall interaction is complex under the cooling jets and needs further investigation. Therefore, the present study focuses on identifying the effects of aerodynamic conditions on the cooling performance of the air-cooled flameholder. Experiments of wall temperature measurement are performed in a simplified augmented combustor. The typical flow and flame features are adopted to interpret the wall temperature distribution. Results show that the wall temperature rapidly decreases and becomes more uniform after added cooling air. Under the given conditions, the highest wall temperature is below 982 K, and the maximum wall temperature range is within 220 K. Enhancing blowing ratio and decreasing cooling air temperature are beneficial for improving the cooling effectiveness. Furthermore, increasing the equivalence ratio and mainstream velocity are helpful to improve cooling efficiency, although increasing the mean wall temperature. Interestingly, increasing the mainstream temperature (within 1000 K) slightly decreases cooling efficiency. Nevertheless, when the mainstream temperature reaches 1100 K, the cooling efficiency dramatically decreases due to the premixed fuel autoignition.

Suggested Citation

  • Chen, Yuqian & Fan, Yuxin & Han, Qixiang, 2022. "Experimental investigation of thermal protection performance of bluff-body flameholder in augmented combustor under air jet cooling," Energy, Elsevier, vol. 254(PB).
    • Handle: RePEc:eee:energy:v:254:y:2022:i:pb:s0360544222011392
    DOI: 10.1016/j.energy.2022.124236
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    References listed on IDEAS

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    1. Shilong, Zhao & Yuxin, Fan, 2020. "Experimental and numerical study on the flame characteristics and cooling effectiveness of air-cooled flame holder," Energy, Elsevier, vol. 209(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. Shilong, Zhao & Yuxin, Fan & Deng, Tiantai & Crookes, Danny, 2020. "Influence of injection scheme on flame characteristics in partially premixed combustion," Energy, Elsevier, vol. 205(C).
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    Cited by:

    1. Zhang, Yueliang & Li, Jiangheng & Xie, Jin, 2022. "Effects of lateral cooling hole configuration on a swirl-stabilized combustor," Energy, Elsevier, vol. 259(C).

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