Performance, Emissions and Combustion Characteristics of Waste Fried Vegetable Oil in Based Biodiesel in High Grade Low Heat Rejection Diesel Engine

Experimental investigations on direct injection diesel engine with ceramic coated combustion chamber with carbureted alcohols and crude jatropha oil

“…Improved combustion in the hot environment provided by LHR combustion chamber might be the reason for this performance. Similar observations were made by earlier researchers [38][39][40][41].…”

“…This confirmed that engine with LHR combustion chamber was more suitable for vegetable oil operation, as there was reduction of coolant load when compared with neat diesel operation. Similar trends were observed by the researchers [38][39][40][41]. Coolant load at full load operation decreased by 17% at recommended injection timing and 24% at optimized injection timing, with engine with LHR combustion chamber with maximum induction of methanol in comparison with conventional engine.…”

“…This might be with (i) reduction of density of air with heat of the insulated components of LHR combustion chamber and (ii) increase of exhaust gas temperatures as volumetric efficiency depends on combustion wall temperatures which in turn depends on EGT From same figure, it is observed that volumetric efficiency at full load operation decreased by 4% at recommended injection timing and 5% at optimized injection timing with engine with LHR combustion chamber with vegetable oil operation in comparison with conventional engine. Similar trends on volumetric efficiency were notice by other researchers [38][39][40][41]. Volumetric efficiency at full load operation decreased by 4% at recommended injection timing and 4% at optimum injection timing with CE, while it was comparable with engine with LHR combustion chamber with vegetable oil operation, when compared with diesel operation.…”

“…However, combustion improved with advanced injection timing with CE with vegetable oil operation. Similar observations were noticed with vegetable oil operation on engine with both versions of the combustion chamber by researchers [38][39][40][41].…”

“…[13][14][15]) with low grade LHR combustion chamber (which consisted of coating of low thermal conductivity material like partially stabilized zirconium (PSZ) on inside portion of cylinder head) with vegetable oils with varied injector opening pressure and injection timing [38][39][40][41]. The optimum injection timing was found to be 32°bTDC with conventional engine, while it was 31°bTDC for low grade LHR combustion chamber with vegetable oil operation.…”