INFLUENCE OF INJECTION TIMING AND COMPRESSION RATIO ON PERFORMANCE, EMISSION AND COMBUSTION CHARACTERISTICS OF JATROPHA METHYL ESTER OPERATED DI DIESEL ENGINE

Document Type: Research Paper

Authors

Dept. of Mechanical Engineering, University College of Engineering Villupuram, Tamilnadu, India

Abstract

Diesel fuel has a limited resource and concerns over environmental pollution are
leading to the use of ‘bio-origin fuels’ as they are renewable and environmentally benign. Jatropha
methyl ester, an esterified biofuel, has an excellent cetane number and a reasonable calorific value.
It closely resembles the behaviour of diesel. However, being a fuel of different origin, the standard
design limits of a diesel engine is not suitable for Jatropha methyl ester. Therefore, in this work,
operational parameters are studied to find out the optimum performance of Jatropha methyl ester
run diesel engine. The parameters varied are the compression ratio (CR) and injection timing (IT)
along with load in a diesel engine. This work targets finding the effects of the engine operating
parameters on the performance of the engine with regard to specific fuel consumption (SFC) and
brake thermal efficiency (BTHE) with Jatropha methyl ester(J20) as fuel. Further exhaust
emissions of the engine for the above conditions are also studied.Thus J20 can be effectively used
in a diesel engine without any modification. At compression ratio of 19.5 along with injection
timing of 30obTDC (before top dead centre) will give better performance and lower emission
which is very close to diesel. Comparison of performance and emission was done for different
values of compression ratio along with injection timing to find the best possible combination for
operating engine with J20. It is found that the combined increase of compression ratio and
injection timing increases the BTE and reduces SFC while having lower emissions. Diesel (20%)
saved, will greatly meet the demand of fuel in railways.

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