Patent Number: 8,714,003

Title: Wind tunnel with a closed section for aeroacoustic measurements with an anechoic coating

Abstract: A wind tunnel with a closed section for aeroacoustic measurements with an anechoic coating including: a) a first cavity having a thickness D.sub.1 in a range of 20.ltoreq.D.sub.1.ltoreq.50 mm filled with a fibrous material with a flow resistance R in a range of 10.ltoreq.R.ltoreq.50 kRayl/m; b) a first microperforated panel having a thickness t.sub.1 in a range of 0.25.ltoreq.t.sub.1.ltoreq.0.75 mm and with a perforation percentage p.sub.1 in a range of 15%.ltoreq.p.sub.1.ltoreq.30%; c) a second air cavity having a thickness D.sub.2 in a range of 10.ltoreq.D.sub.2.ltoreq.30 mm; d) a second microperforated panel having a thickness t.sub.2 in a range of 0.25.ltoreq.t.sub.2.ltoreq.0.75 mm and with a perforation percentage p.sub.2 in a range of 15%.ltoreq.p.sub.2.ltoreq.30%. The perforations of the panels can be circular or longitudinal slot-shaped having a diameter d or width w in a range of 0.2.ltoreq.d, w.ltoreq.0.5 mm.

Inventors: Ruiz Villamil; Heidi Leni (Madrid, ES), Alvarez Gonzalez; Jose Julian (Madrid, ES), Cobo Parra; Pedro (Madrid, ES)

Assignee: Airbus Operations, S.L.

International Classification: G01M 9/00 (20060101)

Expiration Date: 5/06/12018