# title
Freestream Turbulence Measurements in a Continuously Variable Hypersonic Wind Tunnel

# abstract
The Actively Controlled Expansion (ACE) tunnel located at the Texas A&M University National Aerothermochemistry Laboratory (TAMU-NAL) is a unique facility that is characterized by its continuously variable hypersonic Mach number. The tunnel was completed in 2007, and since then, studies have proven its reliability, uniformity, and documented its performance over the available operating range. To better characterize the freestream flow properties, here described as "tunnel noise," a recent study using fast-response pressure transducers was conducted. These transducers were inserted into the freestream, and the resulting pressure fluctuations were recorded across a range of 100 - 80000 Hz to observe spectral peaks relating to disturbances inherent in the flow, and to quantify total noise as a function of the tunnel pressure. The data were collected at Mach numbers of 5, 6, and 7 across the available Reynolds number range for each respective Mach number. Copyright  2012 by the American Institute of Aeronautics and Astronautics, Inc.

# publicationOutlet
50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition

# nameOfConference
50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition

# authors[].organizations[].label
Texas A&M Engineering Experiment Station (TEES)

# publisher.label
American Institute of Aeronautics and Astronautics (AIAA)