The Effect of Compression Ratio on the Performance and Emissions of Internal Combustion Engine Using Oxy Fuels

Abstract

Energy sources are becoming a major issue, with the main concern being cost and continuous supply. The production of oxy fuels is cheap, simple and environmentally friendly, as well as being able to be produced locally, reducing the cost of transporting fuel. Oxy fuels are used as a pure fuel directly in an engine or can be mixed with fossil fuel. The fuels granted under oxy fuels are methanol, ethanol, butanol and biodiesel. Oxy fuel has a good impact on engine performance and emissions, due to higher vaporization, high octane value, high inflammability temperature and a single boiling point. The purpose of the paper was to examine the internal combustion engine performance and emission due to the effect of compression ratio powered by oxy fuels that could replace petrol fuel or improve its fuel properties. The higher octane value of oxy fuels can result in higher compression ratios before engine knocking starts, thus more power can be developed economically in the engine. One of the facts found from this review study was the slight increases or decreases in power when oxy fuels were used at the original compression ratio in internal combustion engines. Also, carbon monoxide, hydrocarbon and nitrogen oxide emissions decreased while the fuel consumption increased. But higher compression ratio increased engine performance and fuel consumption both for spark ignition and compression ignition engines decreased. There were decreased emissions of carbon dioxide, carbon monoxide and nitrogen oxides from oxy fuels as the compression ratio of the spark ignition engine grew but the hydrocarbon emission increased. In the compression ignition engine, the hydrocarbon, carbon monoxide and nitrogen oxide emissions decreased as the compression ratio increased with biodiesel fuel.