An Experimental Study On The Performance And Exhaust Emission Characteristics Of A CI Engine Powered By Alcohol/Biodiesel/Diesel Fuel Blends Containing Different Types Of Alcohol (Isopropanol-C3, 1-Butanol-C4, And Isopentanol-C5)

Abstract

Alcohols are significant alternative and renewable fuel candidates for the utilization in the internal combustion engines due to encouraging favorable environmental and economic outputs. Long-chain alcohols have various advantages over short-chain alcohols because oftheir larger energy content, elevated cetane number (CN) and preferable blending properties,etc. The objective of the present experimental research deal with the exploring and comparethe influence of the ternary fuel mixtures of petroleum-based diesel fuel, cottonseed oil methyl ester (COME) and long-chain alcohols of isopropanol (Pr), 1-butanol (Bt), and isopentanol (Pt) on the performance and emission characteristics of a single-cylinder, four-stroke,naturally-aspirated, direct-injection compression-ignition (CI) engine. As the prepared tested fuel samples, four different blends were as follows on a volume basis: B20 (20% COME+ %80 diesel fuel), B20Pr20 (20% COME + %20 isopropanol + %80 diesel fuel), B20Bt20(20% COME + %20 1-butanol + %80 diesel fuel), and B20Pt20 (20% COME + %20 isopentanol + %80 diesel fuel). The engine trials were carried out at various loads (0-1250 W)and under a constant speed (3000 rpm) to observe the aforementioned behaviors. Based onthe experimental outcomes, brake specific fuel consumption (BSFC) values of B20Pr20 exhibited higher than those of other ternary blends at all loads. Brake thermal efficiency (BTE)values for B20Pt20 were observed as larger than those of ternary blends. B20Pt20 had higherexhaust gas temperature (EGT) values than those of B20Bt20 and B20Pr20. The infusion oflong-chain alcohols to COME/diesel blend caused to reduce NOX emissions meanwhile isopropanol, 1-butanol, and isopentanol were the most to least influential alcohol types, respectively. Besides, with the addition of alcohol, a substantial decrement was noticed in smokeopacity at entire loads owing to the excess amount of oxygen content and lesser ratio of C/Hof the alcohols. However, CO and HC emissions rose by infusion of long-chain alcohols tothe blends. Finally, it can be concluded that higher alcohols could be a possible fuel additivefor the fractional replacement for petroleum-based diesel fuel and biodiesel in the blends forCI engine practices.INTRODUCTIONKeyword