The thermal efficiency of most commercially used engines ranges from 38% to 42%, as nearly 58% to 62% of energy is lost in the form of waste heat. In order to save energy the hot parts are coated. This will lead to reduction in heat transfer through the engine, involving an increased efficiency. Change in combustion process due to insulation also affects emissions. Hence, In this work an effort made to study the effect of the piston top coated with catalytic materials such as copper using plasma spray gun. The concept of catalytic combustion in spark ignition engines has been tried by various researches which offers improved thermal efficiency and reduced exhaust emissions due to oxidation of fuels with aid of catalyst. The performance and emission characteristics of the engine coated with catalytic materials are studied and are compared with the standard engine. Experimental investigations are conducted to evaluate the performance and Measure the exhaust emissions from two-stroke, single cylinder, spark ignition (SI) engine, with Butanol & Gasoline Blends (90% Gasoline and 10% Butanol by volume, 80% Gasoline and 20% Butanol by volume, 70% Gasoline and 30% Butanol by volume) having Copper coated Piston Crown of thickness 300 μ and compared with conventional SI engine with pure gasoline operation. Performance parameters such as Brake thermal efficiency, Brake specific fuel consumption, Mechanical efficiency are determined and exhaust emissions like carbon monoxide (CO) and un-burnt hydro carbons (UBHC) are Measured by applying different loads on the engine. Copper coated piston crown with Butanol blended gasoline engine has improved performance and reduced pollutants as compared with conventional engine.
Butanol, S.I Engine, BSFC, copper coated combustion chamber, Butanol-Gasoline blends, CO and UBHC
