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Comparative Studies on Performance Parameters of Direct Injection Diesel Engine with Ceramic Coated Low Heat Rejection Combustion Chamber with Rice Brawn Oil Based Biodiesel

Investigations were carried out to evaluate the performance of diesel engine with low heat rejection (LHR) combustion chamber consisting of ceramic coated cylinder head ( partially stabilized zirconium of thickness 500 microns was coated on inside portion of cylinder head) with superni insert with different operating conditions (normal temperature and preheated temperature) of rice brawn oil based biodiesel (ERBO) with varied injection timing and injector opening pressure. Performance parameters [brake thermal efficiency, exhaust gas temperature, sound levels, coolant load and volumetric efficiency] were determined at various values of brake mean effective pressure (BMEP) of the engine and compared with conventional engine with biodiesel operation at similar operating conditions. Biodiesel showed compatible performance with conventional engine (CE), while LHR combustion chamber improved the performance in comparison with pure diesel operation at similar operating conditions. The optimum injection timing was found to be 31 o bTDC with CE while it was 30 o bTDC for ceramic coated LHR combustion chamber with biodiesel operation. Relatively, with LHR combustion chamber with biodiesel operation, peak brake thermal efficiency increased by 3%, at full load operation- brake specific energy consumption was compatible, exhaust gas temperature decreased by 50 o C, coolant load decreased by 5%, sound levels decreased by 9% and volumetric efficiency was compatible in comparison with pure diesel operation at similar operating conditions.