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Volume & Issue no: Volume 3, Issue 9, September 2014

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Title:
Experimental investigations of comparative performance and exhaust emissions of cottonseed biodiesel fuelled DI diesel engine with low grade LHR combustion chamber
Author Name:
M.V.S. Murali Krishna, D. Srikanth, and P.Ushasri
Abstract:
ABSTRACT Investigations were carried out to evaluate the performance and study exhaust emission of a low grade low heat rejection (LHR) diesel engine with ceramic coated cylinder head [ceramic coating of thickness 500 microns was done on inside portion of cylinder head] with different operating conditions [normal temperature and pre-heated temperature] of cotton seed biodiesel with varied injector opening pressure and injection timing. Performance parameters [brake thermal efficiency, brake specific energy consumption, exhaust gas temperature, coolant load and volumetric efficiency] were evaluated at different values of brake mean effective pressure (BMEP) of the engine, while exhaust emissions [particulate emissions and nitrogen oxide (NOx) levels)]were measured at full load operation of the engine. Comparative studies were made with conventional engine (CE) with biodiesel and also with mineral diesel operation working on similar operating conditions. Engine with LHR combustion chamber improved its performance when compared with CE with biodiesel operation. The optimum injection timing with CE with biodiesel was 31o bTDC (before top dead centre), while it was 30o bTDC for engine with LHR combustion chamber. Engine with LHR combustion chamber at optimum injection timing of 30o bTDC with biodiesel operation increased peak brake thermal efficiency by 7%, at full load operation–decreased coolant load at full load by 15%, reduced volumetric efficiency by 6%, particulate emissions by 69% and increased NOx levels by 29 % in comparison with CE with neat diesel operation at manufacturer’s recommended injection timing of 27o bTDC Keywords: Crude vegetable oil, biodiesel, LHR combustion chamber, fuel performance, Exhaust emissions.
Cite this article:
M.V.S. Murali Krishna, D. Srikanth, and P.Ushasri , " Experimental investigations of comparative performance and exhaust emissions of cottonseed biodiesel fuelled DI diesel engine with low grade LHR combustion chamber" , International Journal of Application or Innovation in Engineering & Management (IJAIEM) , Volume 3, Issue 9, September 2014 , pp. 321-331 , ISSN 2319 - 4847.
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