Abstract
The turbulent boundary layer excitation is one of the main sources of aircraft interior noise over a large frequency range and in particular in the flight deck where its geometry drives the physics of the turbulences. The present study investigates measured turbulent boundary layer auto-spectrum properties. For that purpose an A320 has been instrumented with 15 flush-mounted microphones on the upper right quarter of the flight deck. The flight test campaign has been performed in cruise conditions between 27,000 and 39,000 ft with Mach numbers from 0.7 up to 0.82. Analysis of measured data shows strong shape effect on the aerodynamic excitation near windows area. This study points out that advanced numerical tools are required to model these complex aerodynamic phenomena.
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