The Virginia Tech Stability Wind Tunnel is a medium-scale wind tunnel located at Virginia Polytechnic Institute and State University (

Virginia Tech Virginia Tech (formally the Virginia Polytechnic Institute and State University and informally VT, or VPI) is a Public university, public Land-grant college, land-grant research university with its main campus in Blacksburg, Virginia. It also ...

) in

Blacksburg, Virginia Blacksburg is an incorporated town in Montgomery County, Virginia, United States, with a population of 44,826 at the 2020 census. Blacksburg, as well as the surrounding county, is dominated economically and demographically by the presence of V ...

. With a test section measuring and maximum wind speeds of approximately , it is one of the largest university-owned wind tunnels in the United States,Fleming, J. (2010)
Limited budgets can drive innovation
Wind Tunnel International and is used for a wide variety of research projects within the college as well as being contracted out for commercial use, especially product testing. Professor William Devenport is the current director, and Dr. Aurelien Borgoltz is the assistant director.

History

The Stability Wind Tunnel was first built by the

National Advisory Committee on Aeronautics The National Advisory Committee for Aeronautics (NACA) was a United States federal agency founded on March 3, 1915, to undertake, promote, and institutionalize aeronautical research. On October 1, 1958, the agency was dissolved and its assets ...

(NACA), the predecessor to

NASA The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeeding t ...

, at

Langley Research Center The Langley Research Center (LaRC or NASA Langley), located in Hampton, Virginia, United States of America, is the oldest of NASA's field centers. It directly borders Langley Air Force Base and the Back River on the Chesapeake Bay. LaRC has fo ...

in 1940. The wind tunnel was used by NACA for deriving the dynamic stability of fixed models for nearly two decades. In 1958, shortly after being declared surplus, it was acquired by Virginia Tech and was attached to the university's Randolph Hall, where it was re-activated in 1961,Mason, W. H. (1989)
Summary of wind tunnel test facilities
Department of Aerospace and Ocean Engineering, College of Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA and remains active to this day, currently being operated by the Department of Aerospace and Ocean Engineering.
(2013)

Technical details

The Stability Wind Tunnel is powered by a 600-horsepower motor which turns a propeller. In the 1990s, the fan was updated with new, custom-made blades built by Prince Aircraft Company. With the usual set-up, the wind tunnel can, at max velocity, attain a Reynolds Number of over 5,000,000. The removable test section currently in use in the tunnel utilizes stretched Kevlar walls which allow sufficient air flow to exit the system while not disrupting the airflow within the test section.Crede, E. D. (2008)
Aerodynamics and Acoustics of the Virginia Tech Stability Tunnel Anechoic System
/ref> This causes an absence of background noise allows researchers to monitor the sounds coming from the test section with microphones in order to gain data regarding the airflow and turbulence of smooth airfoils and other objects. Along with chambers placed alongside the test section, this leads to the current test section being called "anechoic". The majority of the data is currently received and analyzed by a National Instruments mainframe, alongside a number of amplifiers and other assorted equipment.

Commercial use

The Stability Wind Tunnel has been utilized for research by a number of private organizations. These include a NASA-sponsored acoustic test regarding the landing gear of the Boeing 777 and simulated maneuvers of a scale aircraft in order to obtain data for descent of the aircraft.

References

{{Virginia Tech Wind tunnels Virginia Tech Buildings and structures in Blacksburg, Virginia