Multidimensional modelling of gaseous injection: analysis of an impinging jet

As a consequence of the increasing importance of environmental issues, natural gas has emerged as one of the most promising energy sources for internal combustion engines, in the short medium term, because its usage leads to cleaner combustion, lower CO2 emissions, and energy source diversification. However, considering that automotive DI gas engines are rather new, only limited experience exists on the optimum configuration of the injection system and the related strategy. To facilitate the development of these applications, computer models are being developed. In a previous paper, a phenomenological-3-D integrated approach to simulate gas injection has been presented and validated. This model has been implemented in a modified version of the KIVA 3V code. In this paper the model is used to perform the analysis of an impinging gas jet. The interaction between impinging jet and airflow plays a fundamental role in mixture formation and thus on the evolution of combustion process and pollutant formation. This is particularly true if considering stratified charge engine with late cycle injection. In this paper three wall jet treatments are considered: two different laws of the wall and a no-slip simulation in order to evaluate their feasibility in capturing the jet evolution. Numerical results are validated by comparison against experimental data found in literature.