Abstract
Thermal barrier coatings (TBCs) were used to simulate adiabatic engines with the intention not only for reduced in-cylinder heat rejection and thermal fatigue protection of underlying metallic surfaces, but also for possible reduction of engine emissions. In this research work, the main emphasis is placed on investigating the effect of a TBC on the engine fuel consumption with the support of detailed sampling of in-cylinder pressure. Emission measurements of unburned hydrocarbons and carbon monoxide were also conducted in this study. In the present investigation, the piston crown was coated with the YSZ (Y₂O₃&ZrO₂) ceramic material, using a plasma spraying technique. YSZ (Y₂O₃&ZrO₂) was deposited to a thickness of 250 microns over the piston crown. Investigation showed that, Increasing the brake thermal efficiency, NOx emission and O2 and decreasing the specific fuel consumption, CO and HC emissions for Low heat Rejection engine with thermal coated piston compared to the standard engine. The peak cylinder pressures were increased by a magnitude up to 6 bars in the TBC piston engine, in particular at high engine power outputs, though the exhaust gas temperatures were generally lower, indicating good gas expansion in the power stroke which caused the peak cylinder pressure to raise and that impacted on brake thermal efficiency which is increased by 1.4%.
Published Version
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