A special two-cylinder military specific power plant was employed to evaluate the effect of thermal barrier coated pistons on overall engine performance at simulated low heat rejection-type operating conditions. This study focused on three combustion systems including a noncoated baseline ductile iron piston along with zirconia and chrome-oxide sealed zirconia coated analogs. For the test matrix encompassing ten full and half-load operating conditions, both coated piston combustion systems yielded a detrimental effect on fuel economy in comparison to the baseline combustion system at constant fueling and air consumption rates. These performance differences were attributed to a combination of combustion phasing modulations, injection timing discrepancies, and sluggish combustion associated with the zirconia coated piston configurations.

Issue Section:
Internal Combustion Engines
Keywords:
internal combustion engines, performance evaluation, power plants, thermal barrier coatings, combustion, fuel optimal control
Topics:
Combustion, Combustion systems, Corporate average fuel economy, Cylinders, Engines, Fuel efficiency, Fuels, Heat, Military systems, Pistons, Stress, Temperature, Pressure, Diesel engines, Power stations, Ignition delay
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