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

Daolun Liang, Ke Ren, Zizhan Wu, Yangxu Jiang, Dekui Shen, Heping Li and Jianzhong Liu

Energy, 2021, vol. 220, issue C

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.

Keywords: Tripropylene glycol monomethyl ether; Ethyl alcohol; Nano-aluminum; Nanofluids; Fuel slurry; Droplet combustion (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:220:y:2021:i:c:s0360544220328000

DOI: 10.1016/j.energy.2020.119693

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