Transient CFD simulation of gasoline intake characteristics

It is clear that flow characteristics are crucial for reflecting intake performance of gasoline engine. Based on AVL Fire, 3-D and transient flow in the port and cylinder has been simulated by using CFD code for a 476Q gasoline engine. Boundary conditions, the variable pressures, were employed by 1-D simulation with using Boost software. The effects of flow coefficient and turbulence kinetic energy on intake performance were investigated. A correlation between intake loss coefficient and flow coefficient was presented by the principles of fluid mechanics. Furthermore, the flow coefficient was discussed at various valve lifts. The result shows that the transient CFD simulation can truly reflect the intake characteristics. The intake loss coefficient and flow coefficient are related with geometric parameters of intake port. In addition, high turbulence kinetic energy is associated with the rotational pattern of flow velocity vector.