FLOW ANALYSIS ON SLOPED SURFACES WITH DIFFERENT INCLINATION ANGLES

Abstract

This paper investigates the influence of inclination angle on flow field, surface pressure, separation and reattachment on the surface. The Reynolds-averaged Navier-Stokes equations (RANS) with turbulent model k-ɷ SST was applied for simulation. The numerical results with sloped angle of 25° were then compared with previous experimental data for validation. The influence of inclination angle was investigated with 10 specific cases, thereby determining aerodynamic characteristics such as pressure distribution, surface flow, separation and reattachment positions on the surfaces. The results indicated that the turbulent model shows a high ability in analyzing complex flow around the sloped surface. The numerical results showed that the separation flow occurs for sloped angles above 15°. Then the flow is reattached again on the horizontal surface to form a recirculation region. The length of recirculation regions increases with sloped angles and reaches a maximum value of around 7h for the sloped angle of 90°. The relation between surface flow and pressure distribution on the surface was discussed in detail.