EXPERIMENTAL INVESTIGATION ON A DIRECT INJECTION DIESEL ENGINE USING CASHEW NUT SHELL OIL (CNSO) AS FUEL WITH THERMAL BARRIER COATED PISTONASHOK KUMAR AND KUPPUSAMY RAJANAbstract In this paper, an experimental investigation was carried out to evaluate the performance of the Cashew Nut Shell Oil Diesel Blend (CNSODB) which can be used in diesel engine. The engine piston was coated with ceramic material with Silicon Carbide (SiC) of thickness 400 microns by plasma spray method. The experiments were carried out by diesel and CNSODB (B20- 80% diesel and 20% CNSO) in a single cylinder 4-stroke direct injection diesel engine with and without coated piston at different loads. The performance characteristics such as brake thermal efficiency (BTE), brake speciûc fuel consumption (BSFC), exhaust gas temperature (EGT) were calculated and the emissions like carbon monoxide (CO), carbon dioxide (CO2), hydrocarbon (HC), nitrogen oxides (NO) and smoke opacity were measured. The results revealed that BTE increases by 3.06% and BSFC decreases by 5.3% for B20 with coated piston engine compared with the diesel and B20 without coated engine. For B20 the CO, HC and smoke level decreased while NO increased in the coated piston engine compared to the uncoated piston engine. It is observed that coated piston engine with SiC thermal barrier coating (TBC) gives improved engine efficiency and reduced emissions compared with uncoated piston engine.
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