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Compositional Effects of Gasoline Fuels on Combustion, Performance and Emissions in Engine
- Ahfaz Ahmed - King Abdullah Univ of Science & Tech ,
- Muhammad Waqas - King Abdullah Univ of Science & Tech ,
- Nimal Naser - King Abdullah Univ of Science & Tech ,
- Eshan Singh - King Abdullah Univ of Science & Tech ,
- William Roberts - King Abdullah Univ of Science & Tech ,
- Sukho Chung - King Abdullah Univ of Science & Tech ,
- Mani Sarathy - King Abdullah Univ of Science & Tech
ISSN: 1946-3952, e-ISSN: 1946-3960
Published October 17, 2016 by SAE International in United States
Citation: Ahmed, A., Waqas, M., Naser, N., Singh, E. et al., "Compositional Effects of Gasoline Fuels on Combustion, Performance and Emissions in Engine," SAE Int. J. Fuels Lubr. 9(3):460-468, 2016, https://doi.org/10.4271/2016-01-2166.
Commercial gasoline fuels are complex mixtures of numerous hydrocarbons. Their composition differs significantly owing to several factors, source of crude oil being one of them. Because of such inconsistency in composition, there are multiple gasoline fuel compositions with similar octane ratings. It is of interest to comparatively study such fuels with similar octane ratings and different composition, and thus dissimilar physical and chemical properties. Such an investigation is required to interpret differences in combustion behavior of gasoline fuels that show similar knock characteristics in a cooperative fuel research (CFR) engine, but may behave differently in direct injection spark ignition (DISI) engines or any other engine combustion modes. Two FACE (Fuels for Advanced Combustion Engines) gasolines, FACE F and FACE G with similar Research and Motor Octane Numbers but dissimilar physical properties were studied in a DISI engine under two sets of experimental conditions; the first set involved early fuel injection to allow sufficient time for fuel-air mixing hence permitting operation similar to homogenous DISI engines, while the second set consists of advance of spark timings to attain MBT (maximum brake torque) settings. These experimental conditions are repeated across different load points to observe the effect of increasing temperature and pressure on combustion and emission parameters. The differences in various engine-out parameters are discussed and interpreted in terms of physical and thermodynamic properties of the fuels.