Direct measurements of controlled aerodynamic forces on a wire-suspended axisymmetric body

A novel in-line miniature force transducer is developed for direct measurements of the net aerodynamic forces and moments on a bluff body. The force transducers are integrated into each of the eight mounting wires that are utilized for suspension of an axisymmetric model in a wind tunnel having minimal wake interference. The aerodynamic forces and moments on the model are altered by induced active local attachment of the separated base flow. Fluidic control is effected by an array of four integrated aft-facing synthetic jet actuators that emanate from narrow, azimuthally segmented slots, equally distributed around the perimeter of the circular tail end. The jet orifices are embedded within a small backward-facing step that extends into a Coanda surface. The altered flow dynamics associated with both quasi-steady and transitory asymmetric activation of the flow control effect is characterized by direct force and PIV measurements.

[1]  L. Sigurdson.  The structure and control of a turbulent reattaching flow , 1995, Journal of Fluid Mechanics.

[2]  A. Glezer,et al.  The formation and evolution of synthetic jets , 1998 .

[3]  V. Kornilov.  Skin-Friction Reduction on Body of Revolution Using Boundary-Layer Alteration Devices , 2005 .

[4]  Barton L Smith,et al.  Axisymmetric Coanda-assisted vectoring , 2008 .

[5]  Jonathan B. Freund,et al.  Drag and wake modification of axisymmetric bluff bodies using Coanda blowing , 1994 .

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

[7]  R. Goodson,et al.  THE OPTIMUM SHAPING OF AXISYMMETRIC BODIES FOR MINIMUM DRAG IN INCOMPRESSIBLE FLOW , 1972 .

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

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

[10]  Robert J. Englar,et al.  Advanced Aerodynamic Devices to Improve the Performance, Economics, Handling and Safety of Heavy Vehicles , 2001 .

[11]  H. H. Fernholz,et al.  Report on the first European Mechanics Colloquium, on the Coanda effect , 1965, Journal of Fluid Mechanics.

[12]  A. Roshko,et al.  An experimental study of geometrical effects on the drag and flow field of two bluff bodies separated by a gap , 1985, Journal of Fluid Mechanics.

[13]  P. Monkewitz,et al.  Control of vortex shedding in an axisymmetric bluff body wake , 2000 .

[14]  M. Kiya,et al.  Turbulence properties of an axisymmetric separation-and-reattaching flow , 1991 .

[15]  Ari Glezer,et al.  Jet vectoring using synthetic jets , 2002, Journal of Fluid Mechanics.

[16]  Aerodynamic flow-vectoring of a planar jet in a co-flowing stream , 2002, Journal of Fluid Mechanics.

[17]  Chih-Ming Ho,et al.  Perturbed Free Shear Layers , 1984 .

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

[19]  Charles E. Tinney,et al.  Axial flow over a blunt circular cylinder with and without shear layer reattachment , 2006 .

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

[21]  John C. Magill,et al.  Active Yaw Control with a Wire Suspension System for Dynamic Wind Tunnel Testing , 2005 .

[22]  A. Glezer,et al.  Transitory Fluidic Control of Turbulent Shear Flows , 2006 .

[23]  D. Geropp,et al.  Drag reduction of motor vehicles by active flow control using the Coanda effect , 2000 .

[24]  Robert J. Englar,et al.  Circulation Control Pneumatic Aerodynamics: Blown Force and Moment Augmentation and Modification; Pa , 2000 .