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ABSTRACT:
The invention of internal combustion engines is undoubtedly one of the greatest inventions of the modern era. There has been steady scientific research to look for alternative fuel which is economical, renewable and less harmful to nature and man compared to fossil fuels. The present project is one such experimental work to investigate the performance of a blend of diesel / N-pentanol in an appropriate combustion technique and to establish its suitability as a renewable fuel. The relative performance of diesel fuel and the blend of diesel / n-pentanol will also be analyzed. Diesel fuel blended with 30% n-pentanol is the fuel blend that is proposed to be used in the experiment. Researchers have established that the application of Homogeneously Charged Compression Ignition (HCCI) technique could result in in-cylinder reduction of NOx and PM. Higher thermal efficiency could also be attained. The project also covers studying the emission effect of the diesel/n-pentanol fuel blend for various fuel injection timing, various fuel injection pressure, different EGR rates and different inlet air temperature.
KEYWORDS:
Bio diesel; n-pentanol; Emission characteristics; NOx; HCCI; Performance
1.Introduction
Internal combustion engines are mobile power plants which the human beings have adapted to daily life usage and have become inevitable. The growing use of IC engines in the nature of automobiles has caused congestion on the roads and degradation in air quality due to the pollutants from these power plants. Internal combustion engines oxidize hydrocarbon fuel releasing CO2 and H2O release heat energy by an exothermic reaction. Adding after treatment devises like catalytic converter, diesel oxidation catalyst, DPF, lean NOx etc., on the exhaust tail pipe will create back pressure resulting in fuel penalty. Therefore, a new combustion technique is required to reduce the pollution formation within the cylinder itself. Leading research in HCCI engine has proved that simultaneous reduction of soot and NOx is possible. It is a hybrid combustion technique combining concepts from SI engine and diesel engine.
HCCI is achieved when a completely homogeneous mixture of fuel and air is ignited by the heat generated by isentropic compression of the charge in the pistoncylinder arrangement. Combustion reaction in HCCI starts with low temperature reaction (LTR) at around 700°C for diesel fuel. The initial fuel molecules break up releasing...