ALTERNATIVE FUEL IN SPARK IGNITION ENGINE

AUTHOR: OKOYE, CHRISTIAN IKECHUKWU

DEPARTMENT: MECHANICAL ENGINEERING

AFFILIATION: NNAMDI AZIKIWE UNIVERSITY, AWKA

Due to the increasing demand for conventional fossil fuels and the global concern over the environment, a lot of interest is being shown in the development of alternative sources of fuel energy for internal combustion engines. The use of alcohol for energy source for Petrol engines has an attractive intuitive appeal due to its environmentally friendly nature. Alcohol has been considered a potential source of fuel energy for spark ignition engines due to its high octane value, thus permitting the use of high compression ratios without engine knock. This research work on ‘alternative fuel in spark ignition engine’ investigated the combustion characteristics and performance of alcohol in an unmodified four stroke spark ignition engine. Ethanol, the candidate fuel and their blends with the reference fuel petrol were used for performance evaluation tests in a four stroke single cylinder petrol engine. The tests were conducted at ¾ throttle opening position and at constant engine speed of 3200 rpm. The 3/4 throttle opening position, just below the full rack opening position, was considered the usual throttle opening condition for heavy duty works such as tillage, haulage and for ascending hills. The four fuels used were petrol, ethanol (EI00), its blends with petrol at 20/80, 50/50 volume/volume of ethanol /petrol. The engine’s ability to convert fuel energy into Mechanical work was measured by its brake specific fuel consumption (BSFC) in the tests. The best fuel, with the lowest BSFC was observed to be petrol with the lowest values of 0.36 kg/kW.hr; it was followed by the 20/80 ethanol/petrol blend with a value of 0.42 kg/kW.hr. The fuels were also seen to sustain more loading than any other fuel before the engine stalled. The engine’s pulley temperature was lowest when the engine was fuelled with the fuels, which indicated cooling of the engine and hence the durability of the engine too. A brake thermal efficiency of 22% was recorded for the 20/80 ethanol/petrol fuel blend against petrol’s 24% at ¾ throttle opening condition. Therefore, petrol and the 20/80 ethanol/petrol blend fuels were the fuels that exhibited the highest fuel economy as well as acceptable levels of brake thermal efficiency, which was indicative of sustainability.

TO VIEW THE FULL CONTENT OF THIS DOCUMENT, PLEASE VISIT THE UNIZIK LIBRARY WEBSITE USING THIS LINK, http://naulibrary.org/dglibrary/admin/book_directory/Mechanical_engineering/11362.pdf

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