Numerical study of Combustion Characteristic, Performance and Emissions of a SI Engine Running on Gasoline, Ethanol and LPG

Abstract

A numerical study has been carried out to determine the combustion characteristics, engine performance and emissions of a spark ignition engine. In this work, a four-cylinder,four-stroke indirect injection engine fueled with gasoline, LPG and ethanol was used. The results were collected at a constant engine speed of 2500 rpm with variable compression ratios of 8.5:1, 10.5:1, 12.5:1 (original), 14.5:1 and 16.5:1. Calculations focused on how the parameter of compression ratio could affect variables such as emissions, peak fire temperature, peak fire pressure, specific fuel consumption, effective torque, and brake power. In the findings, it was established that under various compression ratios, LPG and ethanol exhibit superior or better combustion and performance characteristics. It was established further that on all the selected compression ratios, when ethanol is used as the engine fuel, there tends to be a notable decrease in the emissions of unburned hydrocarbon, nitrogen oxide, and carbon monoxide.