2. Wind tunnel architecture

2.1 Subsonic and transsonic wind tunnels

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...