COMPARATIVE STUDIES OF COMBUSTION, PERFORMANCE AND EMISSION PARAMETERS OF DIESEL ENGINE USING CASTOR BIODIESEL BLENDS
Abstract
The experimental studies for combustion, performance and emission characteristics of the variable compression ratio (VCR) diesel engine of rated power 3.5 kW at rated speed of 1500 rpm at two compression ratios of CR-16:1 and CR-18:1 was done using castor biodiesel-diesel blends (B10, B20 and B30) as a substitute fuel. The results revealed that Start of combustion (SOC) advanced, End of combustion (EOC) delayed, Ignition delay (ID), Maximum Rate of Pressure Rise (MRPR) decreased while Combustion duration (CD), Premix Combustion Phase Duration (PCD) increased with biodiesel blends concentration. Increase in CR resulted in reduction in ID, CD, while MRPR and PCD increased as compared to plain diesel. Brake thermal efficiency (BTE) decreased with increase in blending percentage for both compression ratios (CR’s), while higher CR resulted in increase in BTE. Carbon monoxide (CO) and unburned Hydrocarbon (HC) emissions decreased, while Carbon dioxide (CO2) and Nitrogen oxides (NOX) emissions increased with biodiesel contents for both CR’s. Increase in CR resulted in reduction in CO and HC emissions while CO2 and NOX emissions increased. The castor biodiesel may be used as a substitute fuel by blending it partially with plain diesel in diesel engine
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