Comparative study on Gasoline-Ethanol Dual Fuel Injection Strategies in a Small Spark Ignition Engine

The Combustion Institute
Publication Type:
Conference Proceeding
Proceedings of the Australian Combustion Symposium, 2015, pp. 228 - 231
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Combined ethanol as oxygenated fuel with gasoline fuel can have significant synergies with a small spark ignition engines (SSIE) due to the higher ethanol’s latent heat of vaporization, laminar flame speed and research octane number than that of gasoline. This paper reports an experimental investigation to the effect of three dual injection strategies, gasoline port injection (GPI) plus ethanol direct injection (EDI), GPI plus gasoline direct injection (GDI) and GPI only, on the engine performance and the emissions. Experiments were conducted on a modified 249cm3 single cylinder spark ignition engine at a stoichiometric air-fuel ratio (λ=1), constant engine speed and medium engine load. Five injection volumetric percentages were chosen; 0, 25, 50, 75 and 100%. Among the three injection strategies EDI+GPI demonstrated the best engine performance in terms of the increase of IMEP and nitric oxide emission reduction and GPI the second. However, when the percentage of the fuel directly injected increased to 44% for ethanol and 76% to gasoline, the combustion becomes more unstable and more CO and HC emitted than that in GPI only.
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