Porous flap trailing edges for the reduction of jet-flap interaction noise

Kurzfassung

This presentation defines jet-flap interaction in terms of a general problem statement, geometry, aerodynamics and acoustic effects. The jet-flap interaction noise delta defines the noise reduction potential. Noise reduction is achieved with the help of a porous flap with and without cover mesh. The noise reduction performance is shown for jet speeds between Mj=0.45 and 0.76, for the full spectrum as well as its decomposition into broadband-like and tonal parts. The additional cover mesh shows an exceptional performance and is recommended for future use.