The F-15 wind tunnel testing at Georgia Tech has primarily taken place in our Low Turbulence Wind Tunnel (LTWT) facility with 1/32-scale models.  Additional tests were run in the 7' x 9' Harper Wind Tunnel to ensure results were independent of wall and tunnel specific effects.  We have recently fabricated a 1/16-scale F-15 model for tests in the Harper Tunnel scheduled April 1998.

The following are the primary goals of this test series:

• Measurement of spectral characteristics at the top of the vertical tail for this larger scale model.  This will provide an intermediate model scale to our existing data sets.
 
• Test surface fence devices for the attenuation of nearly periodic fluctuating energy at tails.  Previous small scale tests have identified regions of fence effectiveness.
 
• Measure aerodynamic forces on model in both the with- and without-fence cases.  Tests with attenuation fences on a 59.3° delta wing showed no appreciable effect on lift or drag.
 
• Visualize surface structures due to instabilities in the primary vortex flow.  With the large scale model, structures will be larger in size and lower in frequency, which is favorable for flow visualization testing.
 
• Visualize the effects surface fences have on the fluctuating flow field.  Understanding the disruption mechanism of the fences may allow a more refined fence device design.