Experimental evaluation of diesel engine powered with waste mango seed biodiesel at different injection timings and EGR rates

Stringent emission norms and renewable energy policies of governments are creating necessity to adopt renewable energy sources for diesel engine applications. Changing the operating parameters of the engine is one of feasible technique to enhance the engine performance. The present experimental work is mainly focuses on the influence of changing injection timing along with different EGR rates for the research diesel engine fuelled with 20% mango seed methyl ester (MSME 20). Initially, the fuel injection timing varied at three levels such as retarded injection timing (19° bTDC), standard injection timing (23° bTDC) and advanced injection timing (25° bTDC) for the diesel engine powered with 20% mango seed biodiesel blend and compared with diesel. Based on experimentation, it was found that MSME20 blend at advanced injection timing resulted in higher BTE by 4.54% and also drastic reduction in engine exhaust emissions like carbon monoxide, hydrocarbon and smoke emissions by 32.43%, 29.26% and 15.38% when compared with MSME 20 (23° bTDC) blend at full load conditions. However, there was considerable increment in NOX emissions. In order to mitigate the NOX emissions, the engine is further operated with different EGR rates (5% and 10%) at advanced fuel injection timing. Addition of 5% EGR concentration to advanced injection timing (25° bTDC) was significantly reduced NOX emissions by 43.38% without much compromise in engine performance.