Wind tunnel testing – Aerospace

Reduction of noise emissions is a critical technology for aircraft manufacturers and various analytical, empirical and numerical tools exist to help in the design of quieter aircraft.

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Given the complexity of the noise source mechanisms, wind tunnels are used for aeroacoustic measurements of aircraft noise sources and their directivities; both for validating prediction methods and for investigating the acoustic impact of noise-reduction treatments. Both open-circuit, anechoic wind tunnels, and closed-circuit wind tunnels are used for aerodynamic and aeroacoustic studies of various flow-induced noise phenomena. The choice of test facility is driven primarily by the type of application, the design speed, and the desired model scale.

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Wind tunnel acoustic testing – Aerospace system overview

Brüel & Kjær’s Wind Tunnel Acoustic Test System accurately performs all the tasks needed for aircraft acoustic scale-model testing. The system is based on our standard, commercial-off-the-shelf (COTS) products that are optimized for the specific issues faced with wind tunnel test applications. They cover the entire measurement chain of transducer, data acquisition, analysis and reporting.

A system typically consists of the necessary number of microphones, preamplifiers, LAN-XI data acquisition hardware, an acquisition workstation installed with relevant software, PTP (Precision Time Protocol) enabled LAN and one or more remote monitoring stations.