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A comprehensive investigation has been undertaken to explore the effect of split injection phasing under simultaneous port fuel-injected butanol-induced reactivity phasing on the standard biodiesel combustion regimes in an existing single-cylinder diesel engine. Experiments were conducted on a four-stroke single-cylinder CI engine coupled with a manifold intake system at a constant speed of 1500 rpm. Butanol injected (0 ms, 2 ms, 3 ms, 4 ms) through the PFI system was varied along with the split injection timing (55° PISA −23° MISA CA bTDC, 45° PISA −15° MISA CA bTDC, 35° PISA −5° MISA CA bTDC) and pilot injection quantity (25%, 50%, 75%) of Mahua biodiesel. Analysis revealed that the minimum brake-specific energy consumption and the highest exergy efficiency registered were respectively 28.86% lower and 110.29% higher than baseline biodiesel operation. The emission parameters of NO X , Soot, CO, and unburnt hydrocarbons under the induced RCCI regimes also registered a drastic 58.56%, 82.48%, 83.48%, and 97% lower footprint than baseline diesel operation at full load.

Performance-emission effect of n-butanol in Reactivity Controlled Compression Ignition regimes of biodiesel combustion