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This research work investigates the influence of different injection timing (IT) on working characteristics of an engine with 20% Yellow Oleander biodiesel (YOBD20) blend. Experimental tests have been conducted with a YOBD20 blend at different ITs such as 23°BTDC, 25°BTDC, and 21°BTDC were original, advanced, and retarded ITs. From the experimental results, BTE of YOBD20 with advanced IT of 25°bTDC increased by about1.24% higher than YOBD20 at original IT, while the BSFC was diminished by 9% and the NOx emission were increased by 14.2%, while CO, HC, and smoke emissions were decreased by 26.2%, 22%, and 28%, respectively, when contrast with diesel at original IT of 23°BTDC. Further, the NOx emission was diminished by 32% for YOBD20 with retarded IT of 21°BTDC with the penalty of BTE by 0.896% and the other emissions were increased as compared to diesel at original IT. The cylinder pressure, heat release rate (HRR) and rate of pressure rise (ROPR) were increased at advanced IT and for the retarded IT, the performance was slightly inferior due to slow combustion. Further, the NO emission would be reduced with the help of adopting with exhaust gas recirculation (EGR) along with retarding the injection timing.Abbreviation: YOBD: Yellow Oleander Biodiesel; YOBD20: 20% Yellow Oleander Biodiesel +80% Diesel; ppm: Parts per million; CO2: Carbon dioxide; BTDC: Before Top Dead Center; MROPR: Maximum rate of pressure rise; EGT: Exhaust gas temperature; NOx: Oxides of Nitrogen; UBHC: Unburned Hydrocarbon; HRR: Heat release rate; IP: Injection pressure; NOP: Nozzle opening pressure; kWh-kilo Watt hour; EGR: Exhaust gas recirculation; CA: Crank angle
Rajan et al. (Wed,) studied this question.