Studies On Influence Of Injection Pressure On Performance Parameters Of Diesel Engine With Medium Grade Insulated Combustion Chamber With Crude Jatropha Oil Operation

ABSTRACT Vegetable oils, which are renewable fuels, can effectively used to combat fuels shortage in developing conturteis and at the same time bring back degrade lands into cultivation. Experiments were carried out to evaluate the performance of diesel engine with air gap insulated low heat rejection (LHR?2) combustion chamber consisting of air gap insulated piston with 3 mm air gap, with superni (an alloy of nickel) crown and air gap insulated liner with superni insert with crude vegetable oil with varied injector opening pressure. Performance parameters [brake thermal efficiency, exhaust gas temperature, coolant load, volumetric efficiency and sound levels,] were determined at various values of brake mean effective pressure (BMEP) of the LHR?2 combustion chamber and compared with neat diesel operation on conventional engine (CE) and vegetable oil operation at similar operating conditions. Engine with LHR?2 combustion chamber with vegetable oil operation showed improved performance at manufacturer’s recommended injection timing of 27obTDC, and the performance improved marginally with increased injector opening pressure n comparison with CE with diesel and vegetable oil at 27obTDC.