Large-eddy simulation of split injection strategies in RCCI conditions

In this study, we investigate the effect of different split injection strategies on ignition delay time (IDT) and heat release rate (HRR) characteristics in Reactivity Controlled Compression Ignition conditions via large-eddy simulation finite-rate chemistry. A diesel surrogate (n-dodecane) is injected into a domain with premixed methane oxidiser two separate pulses. Three are investigated by fixing amount total fuel mass: varying first timing, second changing mass ratio between injections at fixed timing. compression heating source term approach utilised to take account. The main findings study as follows: (1) general, IDT shifts towards top-dead centre when advanced or retarded. size spatial pattern kernels shown depend dwell injections. (2) precisely timed offered best control over HRR characteristics. However, advancing may lead over-dilution downstream, preventing volumetric reducing peak value. (3) Approximately 21% decrease maximum value, well factor 2.8 increase combustion duration could be achieved (4) As indicated frozen-flow chemistry analysis, configurations, reactivity stratification controlled mixture rather than temperature. indicate that controls downstream stratification, offering control.