Abstract
Engine knock is a critical phenomenon engine designers strive to minimize in the world today. Before now, this has made tetra ethyl lead (TEL) an option for minimizing knock. The basic essence of tetra ethyl lead is to enhance octane rating of petrol which is a vital factor to knocking ability. However, the health and environmental challenges associated with the use of tetra ethyl lead propel the desire to replace it with a better environmental and health friendly substance that will at the same time boost octane rating and give a smoother engine operation. Hence, ethanol was considered in this work at a constant speed test of 2000 rpm and compared to leaded petrol as baseline petrol. BSFC of 0.703 kg\kWhr was obtained with 20/80 compared to 0.709 kg\kWhr obtained with 0/100 as baseline fuel. Maximum brake power of 0.74 kW occurred at a bmep of 1.235 bar with 15/85 ethanol/petrol. Similarly, maximum brake thermal efficiency of 13.44% was obtained with 20/80 ethanol/petrol compared to 11.49% obtained with leaded petrol as baseline petrol. It is indicated that maximum power output, low BSFC and low petrol consumption was obtained with 20/80 ethanol/petrol blend. It is convincible that 20/80 blend ratio offer good alternative to other antiknock agents which are associated with harmful consequences to man and environment. The implication of this work is that a definite blend for optimum performance and more environmentally friendly antiknock agent is established.
Highlights
The global issue of rapid reduction of petroleum fuels and their associated problems lead to extensive search for an alternative doping agent in place of the present doping agents
It is indicated that maximum power output, low BSFC and low petrol consumption was obtained with 20/80 ethanol/petrol blend
The trends indicates that bsfc being dependent on fuel flow rate and brake power, decreases with bmep to a lowest point before increasing with increase in bmep
Summary
The global issue of rapid reduction of petroleum fuels and their associated problems lead to extensive search for an alternative doping agent in place of the present doping agents. The key objective in this paper is to obtain a petrol/ethanol blend ratio that will give an optimum engine performance at constant speed condition. IJET volume 19 doped with ethanol running on S.I engine at constant load condition and found out the critical reasons for advocating ethanol as an antiknock agent are due to its environmental friendly nature, availability, high fuel density, high octane value and low calorific value associated with ethanol. [16] Chan-Wei et al (2004) in their engine test performance showed that CO and HC emissions were reduced as ethanol content in blend increases.[2] It indicates an oxygen enrich fuel and affirm how environmental friendly petrol/ethanol blends are
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