Abstract Alcohols have always been the important alternatives to gasoline. Propanol is expected to be widely used in a spark ignition engine due to the higher heating value than ethanol.… Click to show full abstract
Abstract Alcohols have always been the important alternatives to gasoline. Propanol is expected to be widely used in a spark ignition engine due to the higher heating value than ethanol. In this study, the combustion and emissions of n-propanol/gasoline surrogates were studied. The proportions of n-propanol in blends are 10%, 30% and 50% by volume, and the mixed fuels were named as PRTRF0.1, PRTRF0.3, and PRTRF0.5, respectively. The proportions of n-heptane and iso-octane of gasoline surrogates were adjusted to maintain the same research octane number at 95. Results show that the blends with higher proportions of n-propanol lead to higher maximum in-cylinder pressure, higher maximum in-cylinder mass averaged temperature, shorter flame development duration, and shorter rapid combustion duration. The CO, THC, alkane, acetylene and aromatic emissions decrease as the proportion of n-propanol increases. However, PRTRF0.3 has the highest alkene and aldehyde emissions. Both of the geometric mean diameter of particle matters and the accumulation-mode particle ratio in particle matters decrease as the proportion of n-propanol increases. The effective thermal efficiency of the engine increases with the increase of the proportion of n-propanol. PRTRF0.5 has the highest effective thermal efficiency at the medium load up to 33.1%.
               
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