Pyörrevirtajakajat

Pyörrevirtajakajat, a Finnish term, translates to "vortex generators" in English. These are small aerodynamic surfaces that are attached to the upper surface of a wing or other aerodynamic body. Their primary function is to energize the boundary layer of air flowing over the surface. By creating small, controlled vortices, they disrupt the tendency of the airflow to separate from the surface, especially at higher angles of attack or in areas of adverse pressure gradient.

The principle behind vortex generators is to mix the slower-moving air in the boundary layer with the faster-moving free stream air above it. This increased energy in the boundary layer helps it to stay attached to the surface for longer, delaying or preventing flow separation. Flow separation can lead to a significant loss of lift and an increase in drag, negatively impacting aerodynamic performance.

Vortex generators are commonly found on aircraft wings, particularly on transport aircraft, where they are used to improve low-speed handling characteristics and reduce takeoff and landing distances. They can also be seen on wind turbine blades to enhance efficiency and reduce noise. Their relatively small size and simple design make them a cost-effective solution for improving aerodynamic efficiency in various applications. The placement and size of vortex generators are critical for their effectiveness and are determined through extensive aerodynamic analysis and testing.