A Computational Study Of The Two-phase Flow Around Wing

The two-phase flow on blade surface by means of charging air is one of technical manners to improve the cavitation performance for marine propellers. In order to predict hydrodynamic characteristics a computational system is developed including determination of the pressure distribution on a wing section by use of the conformal mapping method and panel method respectively and of the flow in boundary layer according to the thin shear layer approximation (TSL) for Navier-Stokes equation approach.The wing sections of NACA4412 and NACA0012 are applied to test the computational system. The numerical inspection shows that the panel method with better precision and the momentum and the displacement thickness of boundary layer can be used to complete this calculation. With panel method and finite difference method, the matching of flow parameters on the boundary between viscous and potential flow can be carried out for the two-phase flow on blade surface. Based on the cavitation chart it can be seen that the charging air with appropriate parameters on blade surface is efficient and feasible for improving the cavitation performance of propeller blades.