Analytical Corrections for Acoustic Transmission in Kevlar-Walled Wind Tunnels

What is it about?

Wind tunnels with Kevlar walls provide an excellent test environment for combined aerodynamic and acoustic testing of subcomponents of aircrafts or wind turbines. The Kevlar walls of the wind tunnel and the velocity discontinuity on the wall are an alteration of the flow and sound field compared to the one that is present in operating conditions of the machine. This paper proposes a set of analytical corrections that allow to compensate for the change of the path and amplitude of the sound wave when it propages through the Kevlar membrane and restore the values that would be obtained under operational conditions.

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