Р”Р‡or twin-engined aircraft, manufacturers claim that VGs reduce single-engine control speed ( Vmca), increase zero fuel and gross weight, improve the effectiveness of ailerons and rudder, provide a smoother ride in turbulence and make the aircraft a more stable instrument platform. VGs may also have sharp edges which can tear the fabric of airframe covers and may thus require special covers to be made. Owners have reported that on the ground, it can be harder to clear snow and ice from wing surfaces with VGs than from a smooth wing, but VGs are not generally prone to inflight icing as they reside within the boundary layer of airflow. However, these losses are relatively minor, since an aircraft wing at high speed has a small angle of attack, thereby reducing VG drag to a minimum. In tests performed on a Cessna 182 and a Piper PA-28-235 Cherokee, independent reviewers have documented a loss of cruise speed of 1.5 to 2.0Р’В kn (2.8 to 3.7Р’В km/h). Owners fit aftermarket VGs primarily to gain benefits at low speeds, but a downside is that such VGs may reduce cruise speed slightly. For home-built and experimental kitplanes, VGs are cheap, cost-effective and can be installed quickly but for certified aircraft installations, certification costs can be high, making the modification a relatively expensive process. Aftermarket suppliers claim (i) that VGs lower stall speed and reduce take-off and landing speeds, and (ii) that VGs increase the effectiveness of ailerons, elevators and rudders, thereby improving controllability and safety at low speeds.

Many aircraft carry vane vortex generators from time of manufacture, but there are also aftermarket suppliers who sell VG kits to improve the STOL performance of some light aircraft. For swept-wing transonic designs, VGs alleviate potential shock-stall problems (e.g., Harrier, Blackburn Buccaneer, Gloster Javelin). Р”В®xamples of aircraft which use VGs include the ST Aerospace A-4SU Super Skyhawk and Symphony SA-160. Other devices such as vortilons, leading-edge extensions, and leading-edge cuffs, also delay flow separation at high angles of attack by re-energizing the boundary layer. Vortex generators are used to trigger this transition. A turbulent boundary layer is less likely to separate than a laminar one, and is therefore desirable to ensure effectiveness of trailing-edge control surfaces.

Vortex generators are positioned obliquely so that they have an angle of attack with respect to the local airflow in order to create a tip vortex which draws energetic, rapidly moving outside air into the slow-moving boundary layer in contact with the surface. They can be seen on the wings and vertical tails of many airliners. VGs are typically rectangular or triangular, about as tall as the local boundary layer, and run in spanwise lines usually near the thickest part of the wing. On both aircraft and wind turbine blades they are usually installed quite close to the leading edge of the aerofoil in order to maintain steady airflow over the control surfaces at the trailing edge. To accomplish this they are often placed on the external surfaces of vehicles and wind turbine blades. Vortex generators are most often used to delay flow separation.

Vortex account generator