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Andrew Fejer Unsteady Wind Tunnel  The Andrew Fejer Unsteady Wind Tunnel is the oldest experimental facility at IITs Fluid Dynamics Research Center, and continues to provide excellent flow quality for research in unsteady aerodynamics. It is a closed-circuit, low-speed facility, driven by an axial-vane fan powered by a 40 hp synchronous motor. The wind-tunnel test section is 0.61m x 0.61m in cross section and 3.1 m. in length. Flow velocities up to 40 m/s can be reached by adjusting an H2-vector drive controller, which controls the fan rotational speed. Screens, honeycombs, and a contraction region upstream of the test section yield a turbulence level of 0.03% at the maximum velocity. Controlled oscillation of a shutter mechanism, mounted at the downstream end of the test section, can produce an unsteady flow component. A controlled, unsteady pitch and plunge motion can also be imparted to a model positioned in the flow. In the past few years, The Fejer Wind Tunnel has been used for experiments on unsteady flow control and leading edge vortex control for high lift applications by Professor Williams and his students, with the support of the Air Force Office of Scientific Research. Images
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