This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Experimental Investigations on Evaporation Characteristics of Fuels for Low Temperature Combustion Engine Application
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on October 30, 2020 by SAE International in United States
The combustion and emission formation in the advanced low temperature combustion (LTC) engine strategies are highly sensitive to fuel molecular composition and properties. Ignition timing in LTC is primarily controlled by fuel chemical kinetics and thus, tailoring of fuel properties is required to address its limitations in-terms of lack of control on ignition timing and narrow operating load range. Utilizing fuel blends and additives such as nanoparticles are one of the promising approaches to achieve targeted fuel property. An improved understanding of fundamental processes including fuel evaporation is required owing to its role in fuel-air mixing and thereby emission formation in LTC. In the present work, evaporation characteristics of blends of commercial fuels, viz. gasoline, diesel and alternative fuels, viz. ethanol and butanol are investigated. Further, graphene based nanoadditives at 0.05 wt % in gasoline, diesel and butanol are also investigated. This study is intended to understand the fundamental behaviour of different fuel options for LTC. The important engine fuel properties viz. density, viscosity, surface tension for the all the test fuel samples are measured following ASTM standard test procedure. The evaporation rate studies are carried out by using hanging droplet method. The results obtained show that the trends of the changes in gross fuel properties including density, viscosity and surface tension for the fuel blends are in accordance with the base fuel proportion, while the changes are insignificant with nanoparticles addition. The evaporation rate study reveals that the changes in fuel evaporation rate are strongly influenced by the fuel type, viz. multi component or single component. Utilizing fuel blends is found to suppress the hydrophilic nature in case of ethanol. Further, the addition of nanoparticles is found to significantly improve the evaporation rates of fuel blends.