This study attempts to identify the optimum dosing level of aqueous aluminum oxide nanofluid in diesel to improve combustion and engine performance and also to overcome the engine emission issues especially, the oxide of nitrogen, smoke, and the particulate matter. The aqueous aluminum oxide (aluminum oxide nanoparticle aqueous 5 wt % suspension) is used as a nanofluid. The dosing level of nanofluid is varied from 30 cc to 60 cc in steps of 10 cc for the performance study. Fuel blend properties such as calorific value, density, kinematic viscosity, and flash point are determined using ASTM standard test methods. Among all blends, the D+50AN showed a maximum improvement of about 5.9% in brake thermal efficiency (BTE) and remarkable reduction in NOx, smoke, HC, and CO as 15.6%, 22.34%, 31.82%, and 13.79%, respectively, at maximum rated power output.

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