Investigation of internal combustion engines gasoline-etanol blends of ingredients as emissions

Thesis Type: Post Graduate

Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey

Approval Date: 2017




Nowadays, using of petroleum-derived fuels as a limited energy source makes the mixture of alcohol and petrol-alcohol as an alternative fuel attractive. It is important to stabilize the mixture of gasoline-alcohol-water in order to reduce the cost. In this study, the phase equilibrium in gasoline-ethanol-water mixtures was investigated firstly and the mixtures giving the highest percentage of ethanol in gasoline were analyzed by using %85 of high octane gasoline, %10 ethanol and %5 of water (V2) and %85 of low octane gasoline, %10 of ethanol and %5 water (S2). As a result of the experiments, it was determined that the percentages of ethanol passing to the gasoline phase decreased as the percentage of water in the mixture increased to 50% ethanol in the mixtures. Then %2.5 and %5 of pyridine and %2.5 and %5 of isobutanol was added as additives to increase the ratio of water in rich phase in terms of gasoline and ethanol. It has been found that the percentage of water passing into the gasoline alcohol phase is higher than the mixtures containing isobutanol in the pyridine added mixture. It was also found that as the percentage of additive material increases, the percentage of water in the gasoline alcohol phase increases. The engine performances and exhaust emissions of fuel mixtures containing pyridine and isobutanol were examined and the results were compared with reference to vehicle test data with high/low octane gasoline. Experiments were performed with the air excess coefficient 1 and at full engine load, at different engine speeds and at different ignition times. The best performances in experiments with different engine revolutions were %80 of low octane gasoline, %10 of ethanol, %5 of water and %5 of pyridine fuels with a mixture of %80 of high octane gasoline, %10 of ethanol, % 5 water and %5 of pyridine. In the case of using such mixtures, the motor torque increased by %3 and %2, respectively, and the motor effective power increased by %4.4 and %2, respectively. In addition, specific fuel consumption decreased by %13.7 and %5.2, respectively. It was also seen that the average effective pressure of the engine increased by %3 and %2, respectively, in the fuels. NOx, CO and HC emissions were found to decrease by %32, %17.9 and %45.9 in the high octane gasoline mixture and %5, %13 and %35.4 in the low octane mixture, respectively. As a result of the studies, low and high octane gasoline mixtures containing %10 ethanol, %5 water and %5 pyridine were used as alternative fuels.