Numerical Simulation Analysis of Fluid Erosion Corrosion of Injection Nozzle for Diesel Engine

Abstract

According to the basic principle of fluid flow, mathematical models of erosion corrosion and cavitations flow phase transition are established, the internal fluid flow of the nozzle is numeri- cally simulated and analyzed by Fluent software. The results show that the serious damage position of material caused by the erosion locates on the corner of nozzle inlet. However, the position suf- fered from the maximum shear stress will be near to the nozzle exit when the super cavitation phenomenon exists. For a given level of corrosivity of fuel used, the erosion degree increases with the increase of the viscosity, fluid velocity and inlet pressure of the fuel, as well as the corner radi- us of the nozzle inlet, and decreases with the increase of the back pressure. For a given inlet pres- sure and a flow rate, the erosion corrosion would be reduced and the fuel atomization would be fa- cilitated when the viscosity and back pressure of the fuel as well as the corner radius of the nozzle inlet were reduced.