Abstract
ABSTRACT This research work analyses the combustion, performance, and emissions characteristics of calophyllum inophyllum methyl ester or polanga biodiesel operated single-cylinder direct injection diesel engine appended with alumina nano-additives with two concentrations of 25 ppm and 50 ppm. The test engine was run at varying loads from 25%, 50%, 75%, and 100%. The test engine is to be operated at a constant speed of 1500 rpm speed along with compression ratio of 17.5 and injection timing of 23° bTDC. The magnetic stirrer and ultrasonicator are used for blending of alumina nano-additives. Based on experimental investigation, it is found that with smaller fraction alumina nano-additives, the combustion is improved and emissions are lowered owing to high surface-area-to-volume-ratio of alumina particles. In addition, the blending of alumina has escalated the brake thermal efficiency substantially and reduced brake specific fuel consumption by about 6.56% and 7.37% subsequently. Thus, the improvement in combustion efficiency is observed along with a marginal reduction in NOx, CO, HC, and smoke emissions.
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