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

Yu Zhang, Ronghua Huang, Sheng Huang, Pei Zhou, Xiaoxuan Rao, Guojun Zhang and Liang Qiu

Energy, 2021, vol. 223, issue C

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.

Keywords: Auto-ignition; Combustion; Puffing; Single droplet; N-Pentanol-diesel blends (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:223:y:2021:i:c:s0360544221002437

DOI: 10.1016/j.energy.2021.119994

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