Wind tunnel architecture
Aeronautical Wind Tunnels. Achitecture, Testing Process, Measurements Techniques

These are the most frequently encountered installations, since they correspond to the flight envelope of a large proportion of aircraft, and in particular all civil aircraft. Although they cover different flight envelopes, their architecture is largely similar, as shown in figure 4.

Subsonic wind tunnels cover the Mach number range from 0 to around 0.6, for which gas compressibility effects remain moderate (see figure 2). Transonic wind tunnels are usually considered to cover the...