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Flow Control for Vehicle Populsion/Weapons Integration

Award Information

Department of Defense
Air Force
Award ID:
Program Year/Program:
2001 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Combustion Research and Flow Technology, Inc.
6210 Kellers Church Road Pipersville, PA 18947-1020
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2001
Title: Flow Control for Vehicle Populsion/Weapons Integration
Agency / Branch: DOD / USAF
Contract: F33615-01-C-3118
Award Amount: $0.00


An internal aircraft weapons bay, when exposed to freestream flow, experiences an intense aeroacoustic environment and varied suppression concepts have been tested for attenuating flow-induced oscillations. Recent tests with open-loop, high-frequencyexcitation have shown great promise in providing broadband attenuation and elimination of tones. High frequency actuation apparently alters the dynamics of the turbulent energy cascade and accelerates the transfer of energy from low frequency, large scaleeddies to high frequency, small-scale eddies, where it finally gets dissipated as heat. The proposed program is focused on using a Hartmann-Sprenger resonance tube as a high frequency actuator for cavity acoustic attenuation. Large Eddy Simulation (LES)will be complemented by Phase-averaged Schlieren and by Particle Image Velocimetry (PIV) measurements in miniature and sub-scale cavities. These diagnostics will provide insight into turbulence-acoustic interactions. Testing at varied scales will providevalidation of scaling laws for high frequency actuation physics. CFD simulations will provide guidance for the design of the high frequency actuator. These investigations will provide the foundation for designing a prototype High Frequency AcousticSuppression (HFAS) system for eventual flight-testing on a RAAF F-111. The HFAS prototype will be based on a modification of the full-scale Active Separation Control (ASC) flight demonstration model.

Principal Investigator:

Neeraj Sinha
Vice President & Technica

Business Contact:

Neeraj Sinha
Vice President & Technica
Small Business Information at Submission:

174 North Main Street, P.O. Box 1150 Dublin, PA 18917

EIN/Tax ID: 232759059
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No