AERODYNAMIC SHROUD HAVING TEXTURED SURFACE

摘要: An aerodynamic shroud positionable surrounding a hub to which blades are attached is disclosed. The has textured outer surface that configured so as create turbulent boundary layer for fluid flowing over the surface. delays flow separation from and reduces drag. may be formed domed shell mounted on have skirts surround hub. provided by dimples in or projections intended reduce main tail rotor drag helicopters but also useful marine propellers, aircraft propellers jet engine fans.