Experimental Study on Combined Effect of Yttria Stabilized Zirconia Coated Combustion Chamber Components and Emulsification Approach on the Behaviour of a Compression Ignition Engine Fuelled with Waste Cooking Oil Methyl Esters 2019-28-0164

Waste Cooking Oil (WCO) is generated in large quantity worldwide due to the increase in population and change of food habits. This work is about utilizing this WCO as an alternative fuel for Compression Ignition (CI) engine, in view of addressing the constraints in the domain of land as well as air pollution. A fuel and engine level modification were carried out to analyse the behaviour of the test engine. In the first phase of the study, collected WCO was converted into its methyl esters (i.e. WCOME) and tested for its properties. A single cylinder, water cooled, direct injection, compression ignition engine was developed with suitable emission and combustion parameters computing equipments in the second phase of the work. In the third phase of the work, the developed engine was tested with neat diesel, WCO and WCOME under different engine power outputs.

WCOME was converted into its emulsion (WCOMEE) and tested in the developed engine in the fourth phase of the work. In the fifth phase of the study, combustion chamber components like piston, cylinder head and valves were coated with 100 microns of Nickel-Chromium Aluminium (NiCrAl) bond coat and 200 microns of 8% Yttria Stabilized Zirconia (YSZ) ceramic coat as a Thermal Barrier Coating (TBC) using plasma spray coating technique. Finally, the modified engine was tested with the WCOMEE and results were compared.

Carbon-based emissions of WCOMEE were also found to be in the lower side with the TBC engine at the penalty of a slight increase of Oxides of Nitrogen Emission. On the other hand Brake Thermal Efficiency (BTE) of WCOMEE has been decreased from 27.2% to % with the unmodified engine. However, the BTE of WCOMEE has been significantly increased to 29.4 % when it was tested in the TBC engine. Thus, it has been proved that WCOME can be used in the emulsified form in the TBC coated CI engine for optimized performance and emission characteristics.