Numerical Analysis of Compression Ignition Engine using Ethanol Blends

Abstract

The effects of ethanol (C2H5OH) with the diesel fuel in the proportions of 05%, 10%, 15% and 20% (by vol.) are evaluated numerically to assess the performance and the combustion behavior of a four stroke, six-cylinder, direct injection (DI), ‘Mercedes-Benz’, diesel engine. Simulations are performed to validate the experimental study as well as combustion model. Combustion chamber cylinder pressure, temperature and emissions plots are obtained using ANSYS FORTE. These combustion chamber pressure, temperature and heat release plots highlight about interesting aspects, that illustrates the combustion mechanism using these auspicious biofuels which can be obtained from biomass (Bioethanol). The significant results have been observed using these bio-fuels blends, reduction of SOOT, CO and NOx emissions are examined with increasing percentage of biofuels like D100E0, D95E05, D90E10, D85E15 & D80E20 respectively. Reduction in cylinder pressure has been perceived to some extent while cylinder temperatures are decreased during second part of the combustion. Emissions are reduced to greater degree compromising the engine power to a little extent. Further parametric studies are performed and effects of start of injection (SOI), duration of injection (DOI) and initial inflow droplet and air intake temperature on pressure, temperature, chemical heat release and emissions are studied. These studies show that emissions level can be reduced by slightly varying the differing chemical and physical parameters of the ethanol in contrast to the parameters existing for the diesel fuel, and results assist the precise explanation of the observed engine behavior on emissions as well as performance