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The experimental study of the effect of thermal barrier coating on combustion, performance and emission of a diesel engine was investigated. The thermally insulated pistons were compared with standard engine. In general, thermal barrier coating improves the efficiency of the engine and reducing the various energy losses. The experiment was conducted in a single cylinder water cooled DI diesel engine. The results indicate that SiC coated engine shows maximum reduction of NOx emission compared to ZrO2-Al2O3 coated engine and standard engine. By the effect of coating, performance of the engine is slightly increases and smoke density is also slightly enhanced. The second part of the investigation is blending of 2-methoxyethyl acetate (MEA) additive with sole fuel, plus thermal barrier coated engine. The combined effect of thermal barrier coating plus fuel additive shows better performance and simultaneously reduces the smoke and NOX emission.

Diesel Engineers are major sources of prime movers, which are widely used for small and large-scale power generation and transportation purposes. These engines are widely used owing to its high power output and general thermal efficiency. Inspite of these benefits diesel engines cause serious environmental and human discomforts on global scale. The important pollutants from a diesel engine are NOx , HC and particulate matter. These particulates are inhalable, capable of travelling deep into lungs and causes diseases. As a result of this governments and health organizations have tightened the standards for pollutants from diesel engine. Hence it has becomes important that these particulate matters have to be reduced or eliminated from the exhaust f diesel engine. This project aims to reduce the particulate emission in the diesel engine exhaust and to improve the performance of the engine.

The main objective of this investigation is to improve the performance and cleaning up diesel engine's exhaust by fumigating methanol and by adding fuel additives of known percentages. To control the emission from diesel engine and to improve performance, alternate fuel and incylinder control techniques were used. The experimental study was carriedout in a single cylinder diesel engine. A waste heat recovery heat exchanger was provided to preheat the inlet air by utilizing exhaust gas heat. The experimental setup is such that the methanol is fumigated in the heat exchanger very near to the intake manifold. The results of an experimental investigation relating to the performance characteristics by fumigating methanol and fuel additive are reported. The result shows an appreciable reduction of emissions such as particulate matter, Oxides of nitrogen, Smoke density and marginal increase in the performance when compared with normal diesel engine.