Performance and combustion analysis of a PPCCI engine with diesel as a premixed fuel to reduce soot emission

Abstract

In this research work, premixed fuel (diesel) with varying premixed ratios (0.25, 0.50, and 0.75) in manifold along with traditional in-cylinder-injected diesel was used. The results were compared with conventional in-cylinder-injected CIDI engine. It was observed that unburnt hydrocarbon (UBHC) and carbon monoxide (CO) increases when compared to CIDI mode. Brake thermal efficiency was found to be slightly decreased. Soot emission decreases as the premixed ratio increases. Significant reduction in oxides of nitrogen was achieved with the partially premixed charge compression ignition (PPCCI) mode for all the premixed ratios used. Diesel premix ratio of 0.25 was observed to be optimum as the brake thermal efficiency reduction was only marginal compared to diesel mode and the soot emission was lower than that of diesel.