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Calcium fluoride promoting the combustion of aluminum powder

Author

Listed:
  • Ji, Yanwu
  • Sun, Yunlan
  • Zhu, Baozhong
  • Liu, Jianzhong
  • Wu, Yuxin

Abstract

Aluminum (Al) powder as an additive can enhance the specific impulse of propellants. However, it is hard to completely burn due to its aggregates in the combustion of propellants. To improve the combustion of Al powder, calcium fluoride (CaF2) was added to micron-sized Al powder to form the Al/CaF2 mixture, whose thermal behaviors, ignition and combustion performance, and combustion products were investigated. Micron-sized Al powder with CaF2 addition can decrease its ignition delay time and increase its self-sustaining combustion time. The corresponding values can be decreased by more than 65% and increased by more than 16%, respectively. Compared with micron-sized Al powder, an obvious gas-phase combustion occurs in the Al/CaF2 mixture. The agglomeration mechanism of Al combustion in the Al/CaF2 mixture were analyzed. On the one hand, the uneven distribution of oxidant leads to a pressure difference during combustion to accelerate Al agglomeration; on the other hand, the melting-agglomeration-combustion process occurs because the melting temperature and the ignition temperature of Al have a big difference. In addition, an improved Al combustion mechanism was established.

Suggested Citation

  • Ji, Yanwu & Sun, Yunlan & Zhu, Baozhong & Liu, Jianzhong & Wu, Yuxin, 2022. "Calcium fluoride promoting the combustion of aluminum powder," Energy, Elsevier, vol. 250(C).
    • Handle: RePEc:eee:energy:v:250:y:2022:i:c:s0360544222006752
    DOI: 10.1016/j.energy.2022.123772
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    References listed on IDEAS

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    1. Liang, Daolun & Ren, Ke & Wu, Zizhan & Jiang, Yangxu & Shen, Dekui & Li, Heping & Liu, Jianzhong, 2021. "Combustion characteristics of oxygenated slurry droplets of nano-Al/EtOH and nano-Al/TPGME blends," Energy, Elsevier, vol. 220(C).
    2. Shi, Wei & Sun, Yunlan & Zhu, Baozhong & Liu, Jianzhong, 2021. "Sodium fluoroaluminate promoting the combustion of micron-sized aluminum powder with different particle sizes in carbon dioxide," Energy, Elsevier, vol. 226(C).
    3. Liu, Xinghua & Ma, Yue & Li, Shuyuan & Yan, Hua & Wang, Daxi & Luo, Yongfeng, 2019. "Study of the reaction mechanism of aluminum based composite fuel and chlorine trifluoride oxide," Energy, Elsevier, vol. 168(C), pages 393-399.
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    Cited by:

    1. Sahu, Pradeep & Vairakannu, Prabu, 2023. "CO2 based co-gasification of printed circuit board with high ash coal," Energy, Elsevier, vol. 263(PE).

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