Parametric study and optimization of a RCCI (reactivity controlled compression ignition) engine fueled with methanol and diesel

CATEGORY: RCCI (Reactivity controlled compression ignition)
Parametric study and optimization of a RCCI (reactivity controlled compression ignition) engine fueled with methanol and diesel

Type	Journal Article
Author	Yaopeng Li
Author	Ming Jia
URL	http://www.sciencedirect.com/science/article/pii/S0360544213010293
Volume	65
Pages	319-332
Publication	Energy
Date	February 1, 2014
Abstract	Researchers optimized the combustion of a RCCI (reactivity controlled compression ignition) engine fueled with methanol/diesel by integrating an updated multi-dimensional model and the NSGA-II (non-dominated sorting genetic algorithm II), the combustion of a RCCI (reactivity controlled compression ignition) engine fueled with methanol/diesel. Based on the optimization results, they conducted parametric study by varying energy fraction of methanol, EGR (exhaust gas recirculation rate, initial in-cylinder pressure at IVC (intake valve closing), initial in-cylinder temperature at IVC, and SOI (start of injection). In addition, the sensitivities of the five parameters on fuel efficiency, emissions, ignition timing and RI (ringing intensity) were analyzed. Results revealed that initial temperature and EGR rate exhibited the most significant effect on engine performance and emissions for their obvious effect on combustion temperature. By varying the local fuel-rich and high-temperature regions, methanol fraction and SOI could dramatically affect NOx (nitrogen oxide) emission. Overall, the RCCI combustion with high methanol fraction and advanced SOI exhibited higher fuel efficiency and lower emissions.