USA flag logo/image

An Official Website of the United States Government

Mitigation of Aero-Optic Distortions by Active Flow Control

Award Information

Department of Defense
Air Force
Award ID:
Program Year/Program:
2002 / STTR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
265 Industrial Drive Christiansburg, VA -
View profile »
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2002
Title: Mitigation of Aero-Optic Distortions by Active Flow Control
Agency / Branch: DOD / USAF
Contract: F49620-03-C-0003
Award Amount: $99,030.00


Technology in Blscksburg (Techsburg( and the Physics Department at Virginia Tech propose to investigate the potential of both active and passive devices to mitigate the aero-optical distortions generated in a supersonic flow over acylindrical-base/hemi-spherical-top directed energy system turret. A combined suction and blowing system will be used for active flow control, with vortex generators as passive flow control devices. Phase-front distortions of a large diameter laser beamwill be measured using a variable-shear-interferometry techinque.Techsburg has developed a novel method to produce suction and blowing from the same small fluidic actuator that reduces complexity over separate systems and produces more momentum for flow control than traditional blowing. The proposed technique begins byremoving the horse-shoe vortex/boundary layer forming on the wall near the nose of the turret with suction. Next the fluid removed from the nose region and some aditional air will be injected in predetermined directions into the wake of the turret toenhance mixing. The air suction will be generated by the blowing action with the use of the ejector pump technique. Vortex genertors with sized much smaller than the local boundary layer thickness will be placed on the hemi-spherical dome to cratevortices to delay the separation location over the aft section of the turret.

Principal Investigator:

Semih Olcmen
Principal Research Engineer

Business Contact:

Mrs.Tamara Murray
Buiness Manager
Small Business Information at Submission:

Technology In Blacksburg, Inc.
2901 Prosperity Road Blacksburg, VA 24060

EIN/Tax ID: 311582371
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Research Institution Information:
Virginia Tech
Mechanical Dpt and Physics Dpt
Blacsburg, VA 24061
Contact: Guy Indebetouw
Contact Phone: (540) 231-8727
RI Type: Nonprofit college or university