Closed Circuit Wind Tunnel

The U.S. Army is seeking a closed-circuit wind tunnel with specific requirements. The wind tunnel must have a maximum operating speed of approximately 50 meters per second and a test section size of 101.6 millimeters by 101.6 millimeters. The tunnel must also have a centrifugal fan design and be controlled by a variable-frequency drive. The requirements also include specific details about the test section walls, ports, and fittings. The wind tunnel will be used for testing and research purposes. • The wind tunnel must be a closed circuit to operate an LDV system. • The wind tunnel must have a maximum operating speed of approximately 50 meters per second. • The test section walls must have 6.85 millimeter (0.27-inch)-thick grooves for nozzle restriction plates. • The wind tunnel must have a centrifugal fan design with a variable-frequency drive. • The design must meet specific air speed and turbulence requirements through quantitative analysis, such as computational fluid dynamics (CFD) simulations.