Development of an Atmospheric-Boundary-Layer Profile at the NASA Langley Transonic Dynamics Tunnel

Simulation of Atmospheric Boundary Layer for Air Inlet Testing in Crossflow

“…Similar problems and solutions were also reported with the spires used in Ref. [16]. The operating range of the grid was extended to 30 kt at the air inlet height at maximum tunnel pressure (3.85 atmospheres).…”

“…For a local wind velocity of Uh c 25 kt, this corresponds to a frequency larger than 5 Hz, which is an order magnitude larger than required in Ref. [16]. From Eq.…”

“…Suitable wind tunnels feature long test sections to allow the vorticity, locally shed in the flow by the obstacles, to diffuse and turn into the expected homogeneous turbulence. Typically, the length of the test section is 7 to 10 times its height, although distances as short as 2.6 times the height have been attempted [16], but without reporting measurements directly in the wakes of the spires.…”