MFR for Closed-Circuit Wind Tunnel -_Redacted.pdf

This is a Memorandum for Record documenting a Justification and Approval for a closed circuit wind tunnel procurement by the Army Contracting Command-Redstone Arsenal (ACC-RSA).

The U.S. Army Test, Measurement and Diagnostic Equipment Activity (USATA) is procuring one closed-circuit wind tunnel classified as a new commercial purchase under NAICS Code 541715. The wind tunnel will be delivered to the Army Primary Standards Laboratory (APSL) at Building 5435, Fowler Road, Redstone Arsenal, Alabama 35898. The tunnel is designed for use with Laser Doppler Velocimetry (LDV) systems to enable measurement of lower air speeds and reduce laboratory measurement uncertainty. Key specifications include: maximum operating speed of approximately 50 meters per second (~9,900 feet per minute); test section dimensions of 101.6 by 101.6 millimeters (~4 inches by 4 inches); 6.85 millimeter (0.27-inch) grooves covering approximately 75 percent of the test section length to adjust operating range down to 0.15 meters per second (~30 feet per minute); turbulence intensity less than 1 percent across the operating range; optical-quality glass sidewalls to minimize laser interference; and a centrifugal fan design with variable-frequency drive (VFD) capable of computer control via LabVIEW software without reliance on internet or wireless connectivity. The tunnel must include at least two sealable ports accommodating instrument diameters ranging from 4.3 millimeters to 15.9 millimeters. Any submitted design must demonstrate compliance with specified air speed and turbulence requirements through computational fluid dynamics (CFD) simulations or equivalent quantitative analysis.