EXPERIMENTAL INVESTIGATION ON DI DIESEL ENGINE WITH NICKEL-CHROMIUM COATED PISTON USING MAMEY SAPOTE BIODIESEL

Mechanical Engineering

2nd National Conference on Recent Trends & Innovations in Mechanical Engineering

The vegetable oils are the promising alternative among the different diesel fuel alternatives. However high viscosity, poor volatility and cold flow characteristics of vegetable oils can cause some problems such as injections choking, severe engine deposits filter gumming, piston ring sticking and thickening of lubricant oils from long term use in Diesel engines. Such problems can be eliminated by Thermal barrier coating (insulation) on engine parts such as cylinder head, piston crown, valves etc. The diesel engine rejects 30% energy to coolant and 30% energy to the exhaust leaving only about 30% energy is the useful work. If the heat rejection could be reduced then the thermal efficiency energy would be improved. Therefore using bio-diesel in the thermal barrier coating is the only solution for these problems. Here, tests are conducted on DI diesel engine and Ni-Cr coated engine with the diesel and MameySapote bio-diesel blend of 15%.Nickel-Chromium (Ni-Cr) coating of thickness of 0.2 mm on the piston crown done by plasma spray method. Experimental results showed that the main purpose of this study was achieved as the engine performance parameter such brake thermal efficiency was increased with simultaneous decrease in fuel consumption (bsfc). Further exhaust emission parameters such as CO, HC, CO2 and NOX were also decreased.

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