Shear and Stress Sensitive Films for Near Wall Skin Friction Measurements
Measurements of skin friction on high Reynolds number hydrodynamic surfaces are essential for the design of advanced Naval technology, such as advanced propulsion systems and drag reduction techniques. Accurate measurements of skin friction on complex surfaces however, continue to be problematic. Here we propose continued development of an elastic polymer film that deforms under the action of applied normal and tangential loads, Surface stress Sensitive Films. Skin friction and pressure gradients are determined by monitoring the deformations and applying a finite element model to the film. A prototype of a two-dimensional point sensor has been demonstrated at skin frictions of 500-Pa and Reynolds numbers of 9-million during the Phase I program. An image-based system for distributed measurements of skin friction and pressure has also been demonstrated during this program. The Phase II effort will continue along these two paths and develop deployable sensors for both point and distributed measurements of skin friction. Evaluation of the systems will be performed in the Penn State University water tunnel and at the tow tank at Naval Surface Warfare Center. The Phase II program should culminate in deployment of these sensors for testing in water tunnels, tow tanks, and sea faring vessels.
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