Eksperimentalna analiza keramične prevleke na osnovi Al2O3-TiO2, ki deluje kot termična bariera v zgorevalni komori biodizelskega motorja

Abstract

This work focuses on the thermal barrier coating (TBC) with a thickness of 300 µm for the combustion chamber of a single-cylinder four-stroke diesel engine. The piston crown, and inlet and exhaust-valve head are coated using the air-plasma-spray coating technique. Records found in the available literature revealed that the use of aluminum oxide titanium dioxide (Al2O3-TiO2) ceramic-powder coating and punnagam oil methyl ester (POME) is the most preferred method for improving emission levels. Punnagam oil methyl ester (POME) was prepared with transesterification in order to blend the same substances with biodiesel proportions of B25, B50, B75, B100 and conventional diesel. The proposed test report relies on a single-cylinder four-stroke diesel engine without any modification. This research is aimed at reducing the emission levels and attaining a greener and cleaner system by using a renewable fuel. The test was carried out to assess the engine performance, viz., the brake power, brake thermal efficiency, volumetric efficiency, brake specific fuel consumption and air-fuel ratio, assess the emission levels when combining POME and the Al2O3-TiO2 coated engine and compare them with those of conventional diesel. The amounts of pollutants such as unburned hydrocarbon (HC), carbon monoxide (CO), oxide of nitrogen (NOx) and the emitted smoke opacity were compared to those produced by conventional diesel. The result revealed that POME and the Al2O3-TiO2 ceramic improved the performance of the engine so that the pollution levels are much better than those produced by conventional diesel.