Wind-Tunnel Corrections at High Subsonic Velocities, With Special Reference to Closed Circular Tunnels.

摘要

After a survey of technical reports on wind-tunnel corrections published to date, the author presents a method of approximation for the determination of corrections due to model blockage, wake blockage behind drag bodies, and lift. In accordance with the Prandtl rule, models and wind tunnels in compressible flow are correlated with other models and wind tunnels in incompressible flow. There are definite relations between the corrections for the two correlated tunnels. By applying the Prandtl rule only to flow at a relatively large distance from the models, the wind-tunnel corrections can still be calculated even if the prerequisites of the Prandtl rule are no longer complied with in the vicinity of the models. Particularly extensive tests were made to determine conditions for fuselages and wings of various spans in closed circular tunnels.