Spray and combustion characteristics of butanol-diesel and hexanol-diesel blends under high-altitude conditions

Yan, Junhao; Gao, Suya; Zhao, Weihua; Lee, Timothy H.

doi:10.1016/j.fuel.2021.121753

Title: Spray and combustion characteristics of butanol-diesel and hexanol-diesel blends under high-altitude conditions

Journal Article · Fri Sep 03 00:00:00 EDT 2021 · Fuel

DOI:https://doi.org/10.1016/j.fuel.2021.121753· OSTI ID:1977134

Yan, Junhao ^[1]; Gao, Suya ^[1]; Zhao, Weihua ^[2]; Lee, Timothy H. ^[3]

University of Illinois at Urbana-Champaign, IL (United States)
University of Illinois at Urbana-Champaign, IL (United States); Beijing Institute of Technology (China)
University of Illinois at Urbana-Champaign, IL (United States); Zhejiang University, Zhejiang (China)

Due to their excellent fuel properties, butanol and hexanol are considered as two promising renewable fuels for diesel engine applications. The objective of this work is to investigate and compare the spray and combustion characteristics of butanol-diesel and hexanol-diesel blends under high-altitude conditions. A constant volume combustion chamber was used to provide the desired environment. Experiments were conducted under various ambient temperatures ranging from 800 K to 1200 K and various ambient densities ranging from 11 kg/m3 to 15 kg/m3. Fuel blends with 20% blend ratio (B20 and H20) and neat diesel were used as test fuels. The spray and combustion characteristics of the test fuels were analyzed using measured liquid penetration length, ignition delay, combustion duration, flame lift-off length (FLoL), and spatially integrated natural luminosity (SINL). Here the results revealed that B20 and H20 had shorter liquid penetration length than diesel under low ambient temperature and density conditions due to their higher volatility. The blended fuels showed significantly longer ignition delay than diesel under low ambient temperature conditions, but it could be overcome by increasing the ambient temperature. Adding butanol and hexanol into diesel both extended FLoL especially under low ambient temperature and density conditions, but the effects of hexanol was less dramatic compared to butanol due to its lower latent heat of vaporization and higher chemical reactivity. Both B20 and H20 showed lower SINL than diesel under any conditions, indicating their ability of reducing soot emissions. However, no apparent differences could be found between these two fuels until the ambient temperature dropped to 800 K.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); Tank and Automotive Research, Development, and Engineering Center (TARDEC)

Grant/Contract Number:: EE0007309

OSTI ID:: 1977134

Alternate ID(s):: OSTI ID: 1825340

Journal Information:: Fuel, Vol. 307, Issue C; ISSN 0016-2361

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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