54
3 Subsonic Wind Tunnels
Fig. 3.4 The Grande Soufflerie of Chalais-Meudon (© ONERA)
diameter of 3.14 m and a length of 3.5 m. The circular test section has an entrance
diameter of 0.97 m and a length of 1.32 m, the total length of the wind tunnel being
20 m (see Fig. 3.5). The “optical” test section, of octagonal cross section, is equipped
with planar glass windows so as to facilitate measurements by optical techniques (see
Fig. 3.6). A circular test section has the advantage of mitigating the formation of high
intensity corner vortices from rectangular or square sections. The effects from corner
Fig. 3.5 The S2L research wind tunnel of the ONERA Meudon centre (© ONERA)
3 Subsonic Wind Tunnels
Fig. 3.4 The Grande Soufflerie of Chalais-Meudon (© ONERA)
diameter of 3.14 m and a length of 3.5 m. The circular test section has an entrance
diameter of 0.97 m and a length of 1.32 m, the total length of the wind tunnel being
20 m (see Fig. 3.5). The “optical” test section, of octagonal cross section, is equipped
with planar glass windows so as to facilitate measurements by optical techniques (see
Fig. 3.6). A circular test section has the advantage of mitigating the formation of high
intensity corner vortices from rectangular or square sections. The effects from corner
Fig. 3.5 The S2L research wind tunnel of the ONERA Meudon centre (© ONERA)