Fluidic Control of Asymmetric Forces on a Body of Revolution

The aerodynamic steering forces and moments on an axisymmetric bluff body are controlled by exploiting induced asymmetric, segmented attachment of the base flow to a Coanda surface on a circular tail end. Control is effected by an array of four individuallyaddressable, aft-facing synthetic jet actuators that emanate from azimuthally-segmented slots, equally distributed around the perimeter of the tail. The model is suspended in the wind tunnel by eight thin wires each instrumented with a miniature strain gage sensor for direct dynamic force measurements with minimal support interference with the wake. The aerodynamic effects associated with quasi-steady and transitory asymmetric activation of the Coanda effect are characterized using force and hot wire measurements. Transitory modulation of the actuation waveform of multiple actuators leads to the generation of significant dynamic side forces of controlled magnitude and direction with potential utility for flight stabilization and fast maneuvering.

[1]  Robert M. Bennett,et al.  Wind-Tunnel Technique for Determining Stability Derivatives from Cable-Mounted Models , 1978 .

[2]  M. Amitay,et al.  Aerodynamic Flow Control over an Unconventional Airfoil Using Synthetic Jet Actuators , 2001 .

[3]  Ari Glezer,et al.  Microadaptive Flow Control Applied to a Spinning Projectile , 2004 .

[4]  John C. Magill,et al.  DEMONSTRATION OF A WIRE SUSPENSION SYSTEM FOR DYNAMIC WIND TUNNEL TESTING , 2004 .

[5]  Mukund Acharya,et al.  The mechanism of flow control on a cylinder with the unsteady bleed technique , 1991 .

[6]  J. Magill,et al.  Initial test of a wire suspension mount for missile Virtual Flight Testing , 2002 .

[7]  Ari Glezer,et al.  Transitory Force Development on a Body of Revolution Using Synthetic Jet Actuation , 2003 .

[8]  Fei-Bin Hsiao,et al.  Forcing level effects of internal acoustic excitation on the improvement of airfoil performance , 1992 .

[9]  Ari Glezer,et al.  Fluidic Control of Aerodynamic Forces on a Body of Revolution , 2007 .

[10]  Patrick Reisenthel,et al.  Control of Separated Flows Using Forced Unsteadiness , 1985 .

[11]  Michael Amitay,et al.  Aerodynamic control using synthetic jets , 2000 .

[12]  Michael Amitay,et al.  The dynamics of flow reattachment over a thick airfoil controlled by synthetic jet actuators , 1999 .

[13]  Michael Amitay,et al.  MODIFICATION OF LIFTING BODY AERODYNAMICS USING SYNTHETIC JET ACTUATORS , 1998 .

[14]  F. Hsiao,et al.  Control of wall-separated flow by internal acoustic excitation , 1990 .