A three-dimensional CFD modeling was carried out to investigate effects of VVT/VVA on gas exchange and fuel-air mixing processes in a diesel HCCI engine with early fuel injection. Four VVT/VVA strategies were conducted for this study: i) NVO strategy with fixed EVO and IVC timings but variable valve lifts – referred as NVO Strategy; ii) NVO strategy with fixed valve profiles but variable EVO an...

A reduced mechanism of diesel fuel was developed on the basis Wang’s mechanism. First, for removing unimportant reactions, an importance index defined computational singular perturbation (CSP). Choosing 0.0065, 140 reactions were removed, and obtained a smaller 403 elementary reactions. Second, 32 global quasi-steady-state (QSS) species found with threshold value 0.005. Finally, smallest contai...