2-Stroke RCCI Engines for Passenger Cars

Reactivity Controlled Compression Ignition (RCCI) is one of the most promising solutions among low temperature combustion concepts, in terms thermal efficiency and pollutant emissions. However, for values brake mean effective pressure higher than 10 bar, in-cylinder peak rise rates tend to be too high, limiting specific power any 4-Stroke (4S) engine. Such a limitation can canceled by moving 2-Stroke (2S) cycle. Among many alternatives, “Uniflow” scavenging system with exhaust poppet valves on cylinder head allows designer reproduce same identical patterns 4-stroke RCCI engine, while increasing indicated output. The goal paper explore potential 2-stroke basis comprehensive experimental campaign carried out modified automotive 2.0 L, 4-stroke, four-cylinder, four-valve diesel developed prototype run operating mode (gasoline–diesel), others work standard mode. A One Dimensional-Computational Fluid Dynamics (1D-CFD) model has been built predict performance prototype, when all four cylinders In parallel, an equivalent virtual engine developed, means 1D-CFD simulations empirical assumptions. numerical comparison between 4S 2S engines finally presented, emissions at full load. study demonstrates that maintain advantages combustion, strongly reducing penalization performance,