Venkata Krishna Murthy, M.V.S. Murali Krishna, T.K. K. Reddy, P.V. K. Murthy

Comparative Performance Evaluation of a High Grade Low Heat Rejection Diesel Engine With Carbureted Alcohol and Crude Jatropha Oil

Aim: Investigations were carried out to evaluate the performance of a low heat rejection (LHR) diesel engine consisting of air gap insulated piston with 3-mm air gap, with superni (an alloy of nickel) crown, air gap insulated liner with superni insert and ceramic coated cylinder head with normal temperature condition of jatropha oil and carbureted alcohol (ethanol and methanol) with varied injection timing and injection pressure and compared with methanol operation over ethanol operation. Study Design: Performance parameters were determined at various values of bake mean effective pressure (BMEP) with varied injection timing and injection pressure. Methodology: Pollution levels of smoke and oxides of nitrogen (NOx) were recorded at different values of BMEP. Aldehydes were measured by dinitrophenyl hydrazine (DNPH) method. Combustion characteristics of the engine were measured with TDC (top dead centre) encoder, pressure transducer, console and special pressure-crank angle software package. Brief Results: Conventional engine (CE) and LHR engine showed improved performance at recommended injection timing of 27obTDC and recommend injection pressure of 190 bar, when compared with CE with pure diesel operation. Peak brake thermal efficiency increased by 21%, smoke levels decreased by 58% and NOx levels decreased by 47% with LHR engine at its optimum injection timing with maximum induction of methanol when compared with pure diesel operation on CE at manufacturer’s recommended injection timing.

Keywords:

Crude Vegetable Oil, Methanol Ethanol, LHR engine, Performance, Emissions and Combustion Characteristics,

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