Vortex generators are fitted to
- move transition point rearwards.
- move the transition point forwards.
- delay the onset of boundary layer separation.
Explanation
Vortex generators are small vanes that create vortices mixing high-energy free-stream air into the boundary layer. This re-energised, more turbulent boundary layer resists the adverse pressure gradient longer, delaying separation and improving control effectiveness at high angles of attack.
MridulDev asking:
As i understand , a transition point is a point where air flow changes from laminar to turbulent, so what's the benefit of moving the transition point forward? i think the answer must be reviewed and i think it should be " rearwards"..
Community Comments (3)
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easarabbit Posts: 4 10.10.2012 / 12:26
VG are themselves small air foils that are placed perpendicular to the upper wing surface, and are positioned so as to meet the laminar flow coming over the wing with a slight AOA, the VG as name implies, generates vortices which regenerate the boundary layer and delay flow separation and keep the local flow attached for as long as possible.
There are 2 types of airflow along the upper camber of an airfoil during a flight ie. Laminar & Turbulent flow. Both flow are separated by a point of transition so, as the AOA increased, the portion of the upper airflow ie. turbulent also increases (it moves Forward from trailing edge).
for deep....here's the golf ball eg. (http://www.aerospaceweb.org/question/aerodynamics/q0215.shtml)
There are 2 types of airflow along the upper camber of an airfoil during a flight ie. Laminar & Turbulent flow. Both flow are separated by a point of transition so, as the AOA increased, the portion of the upper airflow ie. turbulent also increases (it moves Forward from trailing edge).
for deep....here's the golf ball eg. (http://www.aerospaceweb.org/question/aerodynamics/q0215.shtml)
M
MridulDev Posts: 48 10.10.2012 / 13:40
thank you, now that makes sense :)
D
DolbyG Posts: 2 27.08.2021 / 01:48
Vortex generators move the transition point forward, by promoting a turbulent boundary layer delaying the separation point.
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