Abstract
The paper describes a new mathematical model for the simulation of unsteady fluid-gas flow in fuel lines. The model primarily focuses on both the accurate prediction of local phase changes and their effects on the unsteady flow in a system such as the propagation of pressure waves. The motivation for this work came from the necessity to predict cavitation in diesel injection systems as well as local evaporation of volatile (alternative) fuels. The model has been implemented into AVL program HYDSIM for the simulation of injection systems. The paper shows an application in diesel injection and analyses the cavitation effects on the dynamics of the system.