Schlieren Based Seedless PIV for High Frequency Cavity Flow Control Applications in Large Scale Wind Tunnel Facilities

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-07-M-3724
Agency Tracking Number: F071-264-3145
Amount: $99,673.00
Phase: Phase I
Program: SBIR
Awards Year: 2007
Solicitation Year: 2007
Solicitation Topic Code: AF071-264
Solicitation Number: 2007.1
Small Business Information
2513 Pierce Ave, Ames, IA, 50010
DUNS: 782766831
HUBZone Owned: N
Woman Owned: Y
Socially and Economically Disadvantaged: N
Principal Investigator
 Magan Paciaroni
 Research Scientist
 (937) 286-5711
Business Contact
 Terrence Meyer
Title: Technical Director
Phone: (515) 294-1805
Research Institution
Flow control using high-frequency actuation to reduce acoustic and vibrational loading from weapons bays and sensor apertures requires a diagnostic approach that can capture instantaneous flowfield data at rates of several kHz. Moreover, large wind tunnel facilities suffer the difficulty that particle seeding is problematic for techniques such as Particle Imaging Velocimetry (PIV). The opportunity addressed by this proposal is that of extending a focused Schlieren “PIV” technique for high-speed imaging of density gradients and seedless velocimetry for studies of high-frequency flow control. Sharp-focusing optics will be employed to demonstrate the feasibility of achieving near-planar imaging of density gradients and velocity. Another important challenge that will be addressed in the current work is the extension of Schlieren “PIV” to non-turbulent freestream flows away from wall boundary layers and shear layers. This may be accomplished by combining Schlieren “PIV” with techniques such as jet injection or laser-energy deposition. Alternatively, plasma actuation for flow control would naturally lead to local density gradients that could be tracked using the proposed approach. Proof-of-concept shakedown tests will be performed in an axisymmetric helium jet and on the center-plane of a supersonic wind tunnel facility in preparation for studies of high-frequency actuation in Phase II.

* Information listed above is at the time of submission. *

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