Dual fuel engine charge motion & combustion study

With increasingly strict emissions legislation, an alternative to conventional fuel is natural gas. It is available in abundance, cheaper than Diesel and gasoline and most importantly, releases less greenhouse gases (CO2) during combustion due to higher H/C ratio. The dual fuel engine with natural gas as primary fuel and Diesel as secondary fuel for pilot injection is a promising concept for future reciprocating engines. However, due to slow flame propagation in leaner (Φ~0.6) fuel/air ratios, combustion remains incomplete releasing CO, formaldehyde, and unburnt CH4.

An improved spark ignition model for LES

The presentation demonstrates the modeling capabilities of the newly implemented ISSIM-LES ignition model to correctly capture early flame variability in a production high performance engine. Results are compared to more traditional models.

Piston bowl optimization using STAR-CD and HEEDS

A multi-objective optimization is carried out to drive bowl shape and injector optimization of a CI engine for automotive application.

Both full-load and part-load operations are simulatenously accounted for in the optimization loop in order to cover a reasonably broad range of engine operations.