POTENTIAL OF A MEDIUM GRADE LOW HEAT REJECTION DIESEL ENGINE WITH CRUDE JATROPHA OIL
Journal Title: International Journal of Automotive Engineering and Technologies - Year 2012, Vol 1, Issue 2
Abstract
Investigations were carried out to evaluate the performance of a medium grade LHR diesel engine 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 different operating conditions of crude jatropha oil with varied injection timing and injection pressure. Performance parameters of brake thermal efficiency (BTE), exhaust gas temperature (EGT) and volumetric efficiency (VE) were determined at various values of brake mean effective pressure (BMEP). Exhaust emissions of smoke and oxides of nitrogen (NOx) were recorded at different values of BMEP. Combustion characteristics of peak pressure (PP), time of occurrence of peak pressure(TOPP), maximum rate of pressure rise (MRPR) and time of occurrence of maximum rate of pressure (TOMRPR) were measured with TDC (top dead centre) encoder, pressure transducer, console and special pressure-crank angle software package. Conventional engine (CE) showed deteriorated performance, while LHR engine showed improved performance with crude jatropha oil (CJO) operation when compared with pure diesel operation at recommended injection timing and pressure. The performance of both version of the engine improved with advanced injection timing and higher injection pressure with test fuels. Peak brake thermal efficiency increased by 4%, volumetric efficiency decreased by 8%, smoke levels decreased by 4% and NOx levels increased by 37% with vegetable oil operation on LHR engine at its optimum injection timing, when compared with pure diesel operation on CE at manufacturer’s recommended injection timing.
Authors and Affiliations
N. Janardhan| Mechanical Engineering Department, Chaitanya Bharathi Institute of Technology, Gandipet, Hyderabad-500 075., M. V. S. Murali Krishna| Mechanical Engineering Department, Chaitanya Bharathi Institute of Technology, Gandipet, Hyderabad-500 075., P. Ushasri| Mechanical Engineering Department, College of Engineering, Osmania University, Hyderabad- 500 007, P. V. K. Murthy*| Vivekananda Institute of Science and Information Technology, Shadnagar, Mahabubnagar-509216.
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