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: FA8650-08-C-3828
Agency Tracking Number: F071-264-3145
Amount: $749,735.00
Phase: Phase II
Program: SBIR
Awards Year: 2008
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
 Sivaram Gogineni
 Project Manager
 (937) 266-9570
Business Contact
 Terrence Meyer
Title: Technical Director
Phone: (937) 286-5711
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 of particle seeding 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. During phase I, a bench-top focusing schlieren-PIV system capable of millimeter-range depth-of-field has been designed and fabricated and successful measurements were made in the center-plane of a supersonic turbulent boundary layer. During phase II, we propose to develop cost-effective schlieren-PIV system which can be used to make measurements in large and small scale wind tunnel facilities and also in combustion environments. We will address the challenging issues such as conditions for successful velocity measurements in a 3-D cavity flowfield, sensitivity of the system, alternate light sources, and image processing. The integrated cost-effective system will be delivered to AFRL at the end of the program and significant commercial efforts will be made in order to enhance fluid dynamics research at government, academia, and industrial laboratories.

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

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