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<p>Nanometric aluminum powder (Al NPs) can decrease the ignition delay time (τ) of liquid hydrocarbon fuels and improve their combustion performance, but it is prone to forming oxidation film on its surface. Calcium fluoride (CaF<sub>2</sub>) was used to modify nAl to inhibit the formation of oxidation film and the influence of CaF<sub>2</sub>-modified nAl on the vaporization, and ignition and combustion of exo-tetrahydrodicyclopentadiene (JP-10) fuels were investigated. The results show that CaF<sub>2</sub>-modified nAl shortens the duration of the transient heating stage during the vaporization of Al/JP-10-based nanofluid fuel droplets (AJP NFD) and increases the number of micro-explosions during the fluctuating vaporization stage. Additionally, the Al/CaF<sub>2</sub> significantly reduces the τ and the ignition temperature (T) of the AJP NFD. At 1023&#xa0;K, the τ of AJP NFD reduces from 0.576 to 0.288&#xa0;s when CaF<sub>2</sub> is added, which is a significant decrease of 50.00%. Similarly, CaF<sub>2</sub> lowers the T of AJP NFD from 418.057 to 361.008&#xa0;K, corresponding to a substantial reduction of 43.20%. These results provide corresponding theoretical support for subsequent research on applying inorganic fluoride-modified Al NPs in liquid hydrocarbon fuels.</p>

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Calcium fluoride-modified nano-sized aluminum powder to promote the vaporization and combustion of Al/JP-10-based nanofluid fuel droplets

  • 期刊论文

  • 发表日期：

    2025年8月10日

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  • Wenjie Yang,
  • Jiaxin Wang,
  • Baozhong Zhu,
  • Yunlan Sun

摘要

Nanometric aluminum powder (Al NPs) can decrease the ignition delay time (τ) of liquid hydrocarbon fuels and improve their combustion performance, but it is prone to forming oxidation film on its surface. Calcium fluoride (CaF2) was used to modify nAl to inhibit the formation of oxidation film and the influence of CaF2-modified nAl on the vaporization, and ignition and combustion of exo-tetrahydrodicyclopentadiene (JP-10) fuels were investigated. The results show that CaF2-modified nAl shortens the duration of the transient heating stage during the vaporization of Al/JP-10-based nanofluid fuel droplets (AJP NFD) and increases the number of micro-explosions during the fluctuating vaporization stage. Additionally, the Al/CaF2 significantly reduces the τ and the ignition temperature (T) of the AJP NFD. At 1023 K, the τ of AJP NFD reduces from 0.576 to 0.288 s when CaF2 is added, which is a significant decrease of 50.00%. Similarly, CaF2 lowers the T of AJP NFD from 418.057 to 361.008 K, corresponding to a substantial reduction of 43.20%. These results provide corresponding theoretical support for subsequent research on applying inorganic fluoride-modified Al NPs in liquid hydrocarbon fuels.