Cryogenic wind tunnels

Cryogenic wind tunnels and their use for high Reynolds number testing are reviewed. Emphasis is given to operational and aerodynamic testing experience in the NASA Langley 0.3-m Transonic Cryogenic Tunnel. Areas covered include development of test techniques and aerodynamic testing in cryogenic tunnels. The use of advanced testing techniques to increase the value of cryogenic tunnels is recommended. These include adaptive wall test sections, using solid but flexible top and bottom walls, and magnetic suspension and balance systems.