Modeling of the fuel injection and combustion process in a CNG direct injection engine

摘要

This paper describes a methodology to model the gaseous fuel injection process in a compressed natural gas (CNG) direct injection (DI) engine. Simulations were conducted using KIVA-3V Release 2 code by modifying the liquid fuel injection model to function as a gaseous fuel injection model. This model simulated gaseous fuel injection using a coarse mesh. In this model, gaseous spheres are injected similar to liquid fuel injection model and the gaseous spheres evaporate together without the latent heat of evaporation. Therefore, it does not require a very fine mesh and saves calculation time.