Skin-Friction Measuring System for Large Wind Tunnels

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA9101-07-M-0029
Agency Tracking Number: F071-346-1064
Amount: $99,936.00
Phase: Phase I
Program: SBIR
Awards Year: 2007
Solicitation Year: 2007
Solicitation Topic Code: AF071-346
Solicitation Number: 2007.1
Small Business Information
2766 Indian Ripple Rd, Dayton, OH, 45440
DUNS: 884812025
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Jim Crafton
 Research Engineer
 (937) 429-4980
Business Contact
 Larry Goss
Title: President
Phone: (937) 429-4980
Research Institution
Currently, no instrumentation that can produce distributions of skin friction in a production wind tunnel is available. While the distribution of skin friction is available from computational fluids models, these models must be validated using experimental data. Here we introduce a new sensor for measurement of skin friction and pressure, Surface Stress Sensitive Film, which is compatible with current Pressure-Sensitive Paint experimental hardware. This sensor is based on the distortions of an elastic polymer film which deforms under the action of the applied normal and tangential loads. Skin friction and pressure gradients are determined by monitoring these deformations and applying a finite element model to the elastic film. This technique has been demonstrated by performing quantitative measurements of pressure and skin friction on aerodynamic models in several wind tunnels. Among these test was an experiment that used PSP on one side of the model and S3F on the other side. Data from each sensor was acquired simultaneously, using the same camera and light source for the PSP and S3F thus demonstrating the compatibility of the S3F with existing PSP hardware. The goal of this proposal is to extend this sensor to measurements of skin friction in larger scale facilities.

* information listed above is at the time of submission.

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