Modelling Spark-Ignited Gaseous Fuelled Engines

This chapter will discuss recent research efforts in the multidimensional modelling of gaseous-fuelled engines carried out by using Computational Fluid Dynamics (CFD). First, the chemical and physical properties of the two most relevant gaseous fuels for engines, namely compressed natural gas (CNG) and hydrogen (H2), will be discussed with specific reference to the engine operation and performance. Secondly, CFD modelling efforts on conventionally port fuel injected (PFI) and conventionally spark-ignited CNG/H2 engines will be discussed and analyzed. A detailed discussion will also be provided on CFD modelling efforts for advanced direct injection (DI) gaseous engines. Finally, the chapter will focus on modelling advanced ignition technologies for gaseous engines, and in particular, passive and active pre-chamber ignition engine operation.