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Experimental study on puffing, auto-ignition and combustion characteristics of an n-pentanol-diesel droplet

Author

Listed:
  • Zhang, Yu
  • Huang, Ronghua
  • Huang, Sheng
  • Zhou, Pei
  • Rao, Xiaoxuan
  • Zhang, Guojun
  • Qiu, Liang

Abstract

Puffing, auto-ignition and combustion characteristics of an n-pentanol-diesel droplet are investigated using the droplet suspension technology under ambient temperatures of 830–930 K and n-pentanol concentrations of 0%–75%. The evolution profile of OH∗ chemiluminiscence is detected by a monochromator. A spike is observed shortly after the auto-ignition time for all these profiles. After the spike, different n-pentanol concentrations lead to different evolution profiles of OH∗ intensity. The profile of D75P25 (75% diesel and 25% n-pentanol by mass) witnesses a slight increase and enters a plateau stage. For D25P75, the combustion and extinguishment of n-pentanol vapor lead to the increase and decrease of OH∗ intensity in a long period, respectively. Furthermore, two auto-ignition delays are obtained by a high-speed camera and a monochromator. The difference between the two auto-ignition delays is nearly irrelevant to n-pentanol concentration at 880 K, while a positive dependence on n-pentanol concentration is shown at 930 K. On the other hand, the higher n-pentanol concentration leads to a longer auto-ignition delay at 880 K but a shorter auto-ignition delay at 930 K. Surface and inner puffing modes are observed at 930 K for D25P75 and D75P25, respectively. Many factors lead to different turning phenomena in droplet temperature curves.

Suggested Citation

  • Zhang, Yu & Huang, Ronghua & Huang, Sheng & Zhou, Pei & Rao, Xiaoxuan & Zhang, Guojun & Qiu, Liang, 2021. "Experimental study on puffing, auto-ignition and combustion characteristics of an n-pentanol-diesel droplet," Energy, Elsevier, vol. 223(C).
    • Handle: RePEc:eee:energy:v:223:y:2021:i:c:s0360544221002437
    DOI: 10.1016/j.energy.2021.119994
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    References listed on IDEAS

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