Comparisons of Using Ternary and Dual Gasoline–Alcohol Blends in Performance and Releases of SI Engines

摘要

Ternary mixed biofuels are receiving increased scientific attention, and recently, researchers proposed different biofuelmixtures under dissimilar engine conditions; each researcher argued that his/her proposed one is the next generation alternative.Accordingly, such ternary biofuel mixtures are extremely needed to be compared against each other under the sameengine conditions to provide the best/most promising one(s) as coming fuel alternative(s) for SI engines. In the current study,comparing of using ternary bio-methanol–iso-butanol–gasoline (MiB), bio-ethanol–n-butanol–gasoline (EnB), and biomethanol–n-butanol–gasoline (MnB) fuel mixtures in pollutant releases and behavior/performance of SI engines is carriedout for the first time. The ternary alcohol–gasoline combined fuels were also compared against dual alcohol–gasoline fuelmixtures. In particular, MiB is compared against iso-butanol–gasoline (iB) and bio-methanol–gasoline (M) fuel mixtures;EnB is compared against n-butanol–gasoline (nB) and bio-ethanol–gasoline (E) fuel mixtures; MnB is compared againstnB and M fuel mixtures. The comparisons of all combined fuels (ternary and dual bases) are carried out experimentally atthe same biofuel mixtures rates and engine working conditions and also compared against pure fossil–gasoline. The resultsshowed that the behavior/performance of MiB, MnB, and EnB are all lower than the pure fossil–gasoline, except for pressureinside cylinder for MiB. The highest behavior/performance among all ternary biofuel mixtures is introduced by MiB.Comparisons of pollutant releases (CO, UHC, and CO2) showed that MiB has the lowest levels, while MnB showed thehighest levels, among all ternary mixtures. Comparisons to pure fossil–gasoline, the MiB and EnB ternary mixtures introducedlower, but MnB showed higher pollutant releases than the pure fossil–gasoline fuel.