Acta Univ. Agric. Silvic. Mendelianae Brun. 2016, 64(3), 863-869 | DOI: 10.11118/actaun201664030863

Alcohol Fuel in Passenger Car

Adam Polcar, Vojtěch Kumbár, Jiří Čupera

Department of Technology and Automobile Transport, Faculty of AgriSciences, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic

The present article studies the effects of combustion of high-percentage mixture of bioethanol and gasoline on the output parameters of a passenger car engine. The car engine has not been structurally modified for the combustion of fuels with higher ethanol content. The mixture used consisted of E85 summer blend and Natural 95 gasoline in a ratio of 50:50. The parameters monitored during the experiment included the air-fuel ratio in exhaust gasses, the power output and torque of the engine and also the specific energy consumption and efficiency of the engine. As is apparent from the results, E85+N95 (50:50) mixture combustion results in lean-burn (λ > 1) due to the presence of oxygen in bioethanol. The lean-burn led to a slight decrease in torque and power output of the engine. However, due to the positive physicochemical properties of bioethanol, the decrease has not been as significant as would normally be expected from the measured air-fuel ratio. These findings are further confirmed by the calculated energy required to produce 1 kWh of energy, and by the higher efficiency of the engine during the combustion of a 50% bioethanol mixture.

Keywords: spark-ignition engine, bioethanol, air-fuel ratio, engine output, specific energy consumption, engine efficiency

Grants and funding:

This research was primarily supported by project TP 6/2015 financed by Internal Grand Agency AF MENDELU.

Prepublished online: July 4, 2016; Published: July 1, 2016  Show citation