The Variable Density Tunnel at Langley Research Center with the drive motor (left), compressor piping (front), and an operator (right).
Acronym
VDT
Other names
Wind Tunnel No. 2
Uses
Measuring aerodynamic qualities of airfoils
Notable experiments
"NACA Technical Report 460: The Characteristics of 78 Related Airfoil Sections from Tests in the Variable-Density Wind Tunnel"[1]
Inventor
Max Munk
Manufacturer
Newport News Shipbuilding and Dry Dock Company
Material
Steel, wood
Components
Steel pressure shell, air compressor, drive motor, internal test section
Related items
NACA, Langley Research Center
The Variable Density Tunnel (VDT) was the second wind tunnel at the National Advisory Committee for Aeronautics (NACA) Langley Research Center. Proposed by German aerospace engineer, Max Munk, student of Ludwig Prandtl, it was the world's first variable density wind tunnel and allowed for more accurate testing of small-scale models than could be obtained with atmospheric wind tunnels.[2]
The VDT was actively used as a wind tunnel from 1923 until its retirement in the 1940s. Langley Research Center historian, James R. Hansen, wrote that the VDT provided results superior to the atmospheric wind tunnels used at the time and was responsible for making NACA, the precursor to NASA, "a world leader in aerodynamic research".[3] It is now on display on the Langley grounds, near the old Reid Conference Center and is a National Historic Landmark.
^Cite error: The named reference 78 airfoil was invoked but never defined (see the help page).
^"On a New Type of Wind Tunnel" (PDF). National Advisory Committee for Aeronautics. Retrieved May 26, 2018.
^Hansen, James R. (1986). Engineer in Charge: A History of the Langley Aeronautical Laboratory, 1917-1958. NASA. p. 65.
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