The purpose of the present study is to investigate the influence of fuel additives [2-methoxyethyl acetate (MEA)] plus thermal barrier coating (TBC) on diesel engine performance, combustion, and emission characteristics. A plasma spray coating (PSC) technique was used to coat the cylinder head, valves, and piston crown with ZrO 2 /Al 2 O 3 of about 150:150 µm. The additives are in the ratio between 0.5 and 2.0%, with 0.5% intervals. They were added to neat diesel fuel, by volume, respectively. In general, the ceramic coating as a thermal barrier improves the efficiency by reducing energy losses. The experiment was conducted in a singlecylinder water-cooled direct-injection (DI) diesel engine. The engine was run at a constant speed of 1500 rpm and fixed injection pressure of 200 bar. In the first phase, engine components were coated with ZrO 2 /Al 2 O 3 by using the PSC techniques and thickness of 150 µm each. In the second phase, experiments were carried out in the thermal-barrier-coated engine by using various blends of fuel additives (MEA). The experiments were conducted at various loads, such as 25, 50, and 75% and maximum load, and the results were compared. The effect of TBC decreased the NO x emission, and the performance profile was found improved. The experimental results show that the combined effect of TBC and fuel additive changes the performance and simultaneously reduces the NO x emission. NO x emission was reduced by 40% in the thermal-barrier-coated engine, and it was further reduced by 10% in the fuel additive plus thermal-barrier-coated engine.
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