A computational investigation of wake-induced airfoil flutter in incompressible flow and active flutter control
Turner, Mark A.
Platzer, Max F.
MetadataShow full item record
In this thesis several incompressible oscillatory flow and flutter problems were investigated. A previously developed unsteady panel code for single airfoil bending torsion flutter analysis was compared to Theodorsen's classical theory. The panel code agrees with Theodorsen's bending-torsion flutter analysis for natural frequency ratios (---) less than 1.2. Also, a two airfoil unsteady panel code was modified for one degree of freedom flutter analysis. Code verification was completed by first comparing flat plate theory to the unsteady aerodynamic force and moment coefficients and then using the equation of motion to determine regions of instability. The possibility of active flutter control was investigated by positioning a small control airfoil in front of a neutrally stable reference airfoil. Results show that the flutter boundary may be changed through the placement, oscillation or scaling of a second airfoil upstream. A comparison with pitch damping curves published by Loewy confirms that the code is capable of predicting wake-induced airfoil flutter.
Approved for public release, distribution unlimited
Showing items related by title, author, creator and subject.
Kakkavas, Constantinos (Monterey, California. Naval Postgraduate School, 1998-12);In this thesis single-degree-of-freedom torsional airfoil flutter is investigated using an incompressible potential flow code, a compressible inviscid Euler code and a compressible viscous Navier-Stokes code. It is found ...
An Experimental and Computational Investigation of Oscillating Airfoil Unsteady Aerodynamics at Large Mean Incidence Capece, Vincent R.; Platzer, Max F. (2003-03);A major challenge in the design and development of turbomachine airfoils for gas turbine engines is high cycle fatigue failures due to flutter and aerodynamically induced forced vibrations. In order to predict the aeroelastic ...
Chalkley, Henry George (1972-06);Supersonic flow past oscillating flat plate cascades with supersonic leading-edge locus is analysed using a linearized method of characteristics valid for arbitrary frequencies and an elementary analytical theory valid ...