The term 'cyclogiro rotor' is commonly used to imply a rotor consisting of a pair of coaxial disks and a number of feathered blades spanning the space between them (Wheatley, J. B., 'Simplified Aerodynamic Analysis of the Cyclogiro Rotating Wing System,' NACA TN 467, 1933). As the disks rotate, the blades' angles of attack (AOA) undulate periodically over one revolution. AOA undulations are induced, through push-pull rods, by an eccentric axis. By changing the position of the eccentric axis relative to the rotation axis, the cyclogiro rotor can be tuned to produce thrust in any direction in the plane of rotation. A combined experimental and numerical study of a cyclogiro rotor operating at Reynolds numbers about 40,000 has been conducted. The study reveals complex flow field with complex (unsteady) interactions between the blades and the wakes of other blades. In spite of this complexity, time-averaged integral forces acting on the rotor can be predicted by a simple momentum theory, properly corrected for thrust-producing area of the rotor and for large Magnus effect. The effective thrust producing area was estimated to be about half of its projected area, suggesting that the effectiveness of a cyclogiro rotor may be comparable with that of a heavy-loaded helicopter rotor.
Experimental and numerical study of cyclogiro aerodynamics
Experimentelle und numerische Untersuchung der Aerodynamik eines Radialrades mit zyklisch verstellten Schaufeln zur Schuberzeugung
AIAA Journal (online) ; 44 , 12 ; 2866-2870
2006
5 Seiten, 11 Bilder, 14 Quellen
Aufsatz (Zeitschrift)
Englisch
Anstellwinkel (Tragflügel) , Drehachse , experimentelle Untersuchung , Exzentrizität , Flugkörper , numerische Strömungssimulation , periodische Bewegung , Propellertheorie , Radialrad , Rotor (Drehflügel) , Schub (Antrieb) , Schuberzeuger , Strömungsverlauf , Theorie-Experiment-Vergleich , Versuchsmodell , Schaufelverstellung
AIAA | 2003
|Wind tunnel tests of a cyclogiro rotor
SLUB | 1933
|Aerodynamic Analysis of an Unmanned Cyclogiro Aircraft
SAE Technical Papers | 2018
|