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
Amount:
$99,673.00
Award Year:
2007
Program:
SBIR
Phase:
Phase I
Contract:
FA8650-07-M-3724
Agency Tracking Number:
F071-264-3145
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
SPECTRAL ENERGIES, LLC
2513 Pierce Ave, Ames, IA, 50010
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
782766831
Principal Investigator:
Magan Paciaroni
Research Scientist
(937) 286-5711
research@spectralenergies.com
Business Contact:
Terrence Meyer
Technical Director
(515) 294-1805
contact@spectralenergies.com
Research Institution:
n/a
Abstract
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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