An Innovative Control Technique for Slender Bodies at High Angle of Attack

2006 ◽  
Author(s):  
Xiao Ming ◽  
Yunsong Gu
Keyword(s):  
Angle Of Attack ◽  
Control Technique ◽  
High Angle ◽  
High Angle Of Attack ◽  
Slender Bodies

FLOW CONTROL AND MECHANISM FOR SLENDER BODY AT HIGH ANGLE OF ATTACK

2005 ◽  
Vol 19 (28n29) ◽  
pp. 1571-1574 ◽  
Author(s):  
XIAO MING ◽  
YUNSONG GU
Keyword(s):  
Flow Control ◽  
High Frequency ◽  
Angle Of Attack ◽  
Control Technique ◽  
High Angle ◽  
Dynamic Measurements ◽  
Wind Tunnel Experiments ◽  
Rolling Angle ◽  
High Angle Of Attack ◽  
Side Force

The wind tunnel experiments for high angle of attack aerodynamics were designed from the inspiration of understanding the mechanism and development of an innovative flow control technique. The side force, varying with the different rolling angle, is featured by bi-stable situation, and can be easily switched by a tiny disturbance. A miniature strake is attached to the nose tip of the model. When the strake is stationary, the direction of the side force can be controlled. When the nose tip strake, as an unsteady control means, is swung the flow pattern could be controlled. The results obtained from dynamic measurements of section side force indicate that when the strake swing at lower frequency the side force can follow the cadence of the swinging strake. With increasing frequency, the magnitude of the side force decreases. At still high frequency, the side force diminishes to zero. The side forces could be also changed proportionally. Based on the experimental factors, the mechanism of the asymmetry is discussed.

Symmetric Vortex Separation on Circular Cylinders and Cones

1959 ◽  
Vol 26 (4) ◽  
pp. 643-648
Author(s):  
A. E. Bryson
Keyword(s):  
Unit Length ◽  
Angle Of Attack ◽  
Experimental Information ◽  
Circular Cylinders ◽  
Leeward Side ◽  
High Angle ◽  
High Angle Of Attack ◽  
Bodies Of Revolution ◽  
Vortex Separation ◽  
Slender Bodies

Abstract The symmetric vortex separation that is observed on the leeward side of slender bodies of revolution at high angle of attack in the subsonic to moderately supersonic-velocity range is analyzed by means of the “lumped-vorticity” approximation suggested by Edwards and Hill. The equivalent unsteady two-dimensional problem of indicial motion of a cylinder in an incompressible fluid with symmetric vortex wake is also considered. Body vortex position and normal force per unit length are presented for a cylinder and a slender cone at high angle of attack and compared with available experimental information.

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