An Experimental Investigation of Piston Coating on Internal Combustion Engine (original) (raw)

The thermal efficiency of most commercially used engine ranges from 38% to 42%, as nearly 58% to 62% of energy is lost in the form of waste heat. In order to save energy the hot parts are insulated. This will lead to reduction in heat transfer through the engine, involving an increased efficiency. Change in combustion process due to insulation also affects emissions. In this study an attempt is made to reduce the intensity of thermal and structural stresses by using a layer of ceramic material. Experimental investigation is carried out under different loading conditions on single cylinder two stroke spark ignition engine with its piston crown coated with Nickel-Chromium & Al2O3 to understand the influence of thermal barrier coating (TBC) on performance characteristics. Al2O3 is chosen as a candidate material for coating the piston crown because of its desirable physical properties like low thermal conductivity, high coefficient of thermal expansion, high thermal resistance, chemical inertness, high resistance to erosion, corrosion and high strength. Thermal barrier coating (TBC) is done by using Plasma Spraying Technique. Engine working conditions are maintained constant before and after coating. Experimental results revealed that the thermal efficiency is increased by 13.75%, Mass of fuel consumption is reduced by 6.02% and brake specific fuel consumption is reduced by 9.84% between coated and bare engine.

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