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Combustion characteristics of oxygenated slurry droplets of nano-Al/EtOH and nano-Al/TPGME blends

Author

Listed:
  • Liang, Daolun
  • Ren, Ke
  • Wu, Zizhan
  • Jiang, Yangxu
  • Shen, Dekui
  • Li, Heping
  • Liu, Jianzhong

Abstract

In this study, two oxygenated slurry fuels were prepared by blending nano-aluminum (Al) particles (5 wt%) with ethanol (EtOH) and tripropylene glycol monomethyl ether (TPGME), respectively. The prepared oxygenated slurries were suspended as droplets on a thermocouple wire, and a laser ignition testing system was used for investigating their combustion characteristics. Snapshots of the combustion process showed that a slurry droplet of nano-Al/EtOH suffered three continuous stages, namely, an ignition delay stage, a droplet combustion stage, and a core combustion stage. In contrast, a slurry droplet of nano-Al/TPGME suffered only the first two stages during its combustion; however, an additional microexplosion phenomenon was also observed. During the droplet combustion stage, nano-Al/EtOH blend displayed higher average burning rate, but lower droplet surface temperature than nano-Al/TPGME blend. Emission spectra indicated the formation of gas-phase intermediate products, namely, Al, AlO, AlO2, and Al2O, via nano-Al oxidation during the combustion of both types of oxygenated slurry fuels. Nano-Al/EtOH and nano-Al/TPGME blends displayed higher emission spectral intensity of AlO and AlO2, respectively. The normalized ignition delay time of nano-Al/EtOH droplets was 41.3% longer than that of nano-Al/TPGME droplets. However, the normalized total combustion time of nano-Al/EtOH droplets was 26.4% shorter than that of nano-Al/TPGME droplets.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:220:y:2021:i:c:s0360544220328000
    DOI: 10.1016/j.energy.2020.119693
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    References listed on IDEAS

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    1. Ji, Yanwu & Sun, Yunlan & Zhu, Baozhong & Liu, Jianzhong & Wu, Yuxin, 2022. "Calcium fluoride promoting the combustion of aluminum powder," Energy, Elsevier, vol. 250(C).

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