Experimental Investigation Of The Effect Of Exhaust Gas Recirculation On Performance, Emission And Combustion Charatersitcs Of A Single Cylinder Low Heat Rejection Diesel Engine Using Rice Bran Biodiesel

All diesel engines are most trusted power source for automobile vehicles of all over the world. But, it emits more exhaust emissions like hydrocarbon (HC), carbon dioxide (CO2), carbon monoxide (CO) and oxides of nitrogen (NOx). The rapid depletion of conventional fossil fuels has promoted research towards alternative fuels for internal combustion(IC) engines. In this study rice bran biodiesel (RBBD) used as an alternate fuel as a substitute for diesel. From the experimental investigation, the diesel has lower brake thermal efficiency and higher brake specific fuel consumption. To overcome this, rice bran biodiesel without exhaust gas recirculation (EGR) is used in low heat rejection (LHR) engine. This results in the increase of brake thermal efficiency and correspondingly reduces the brake specific fuel consumption, but increases the NOx emissions. It is mainly due to the peak combustion temperature, oxygen concentration in the combustion chamber and the residence time of high temperature gas in the cylinder. To overcome this, EGR is being used to reduce and control the NOx emissions by lowering oxygen concentration in the combustion chamber. Hence by analysis, rice bran biodiesel blend with 5%, 10% and 15% EGR in LHR engine provides better performance, combustion and emission characteristics when compared with neat diesel without EGR in conventional engine and rice bran biodiesel without EGR in LHR engine.