Operating range extension of RCCI combustion concept from low to full load in a heavy-duty engine

Abstract

ElsevierMolina Alcaide, SA.; García Martínez, A.; Pastor Enguídanos, JM.; Belarte Mañes, E.; Balloul, I. (2015). Operating range extension of RCCI combustion concept from low to full load in a heavy-duty engine. Applied Energy. 143:211-227. doi:10.1016/j.apenergy.2015.01.035. overlimit function is used to select the best engine settings for each operating point. 23Finally, engine emissions and performance results from that RCCI operation are 24 compared with conventional Diesel combustion (CDC). 25Results suggest that double injection strategies should be used for RCCI operation from 26 low to mid load. However, from high to full load operation, single injection strategies 27 should be used, mainly to avoid excessive in-cylinder pressure gradients. In addition, it 28 is confirmed the suitability of RCCI combustion to overcome the soot-NOx trade-off 29 characteristic of CDC, from 6 to 24 bar of BMEP, while improving fuel consumption. 30

A review on plasma combustion of fuel in internal combustion engines

“…The results of their study showed that active plasma particles and transportation characteristics of charged particles were affected by airflow. 7,8 These methods have been shown to demonstrate the shape of ECR plasma, the effect of plasma generation parameters of magnetic field and radio frequency on plasma shape, and the effect of microwave pumping frequency on plasma's structural properties. Their study also demonstrated that the vibrational temperature can effectively be used to explain the electron and ionization energy mechanism of DBD plasma.…”

“…2 The technology of using only fuel alone in the operation of engines is inadequate due to factors ranging from low thermal efficiency, poor atomization or volatization, 3,4 low vapour pressure leading to rapid evaporation, 5 and high cost of operation due to more fuel consumption. 7 Molina et al 8 suggested the extension of fuel reactivity controlled compression ignition combustion concept from low to full load. 7 Molina et al 8 suggested the extension of fuel reactivity controlled compression ignition combustion concept from low to full load.…”

“…6 Several research studies have been carried out to enhance the fossil fuel combustion processes in gas turbines (GTs). 7 Molina et al 8 suggested the extension of fuel reactivity controlled compression ignition combustion concept from low to full load. They observed that the concept was able to regulate combustion and ignition and was able to minimize the formation of soot and NO x .…”

Effects of fuel ratio and injection timing on gasoline/biodiesel fueled RCCI engine: A modeling study

“…Study carried out by Kokjohn et al [4] has illustrated that the engine loads of RCCI could be operated over a wide range from 4.6 to 14.6 bar IMEP (indicated mean effective pressure) by adjusting the fuel ratio of gasoline to diesel because of the different auto-ignition characteristics of these two kinds of fuels. Molina et al [5] combined both engine test and 3-D (3-dimentional) simulation to explore suitable strategies of extending RCCI loads. It was found that double injection strategy is suitable for low to medium load, and single injection strategy is better for high load.…”

The potential of RCCI concept to meet EURO VI NOx limitation and ultra-low soot emissions in a heavy-duty engine over the whole engine map

“…Thus, previous studies in a heavyduty engine at fixed engine speed of 1300 rpm and 1200 rpm, evaluated RCCI concept from low to high load concluding that RCCI provides very low NOx and soot compared to the reference CDC cases. In addition, a benefit in fuel consumption from low to medium load compared to CDC was also appreciated [28]. In this sense, it was confirmed that RCCI combustion process converts greater percentage of the recovered heat transfer energy into useful work than in CDC operation [29].…”