Abstract
In aerodynamic research circulation control airfoils are shown to yield performance benefits compared to conventional multi-element high-lift systems. Their application on transport aircraft allows to consider new take-off and landing procedures with reduced flight speed and steep climbs and descends. These procedures can help to reduce the noise impact on the ground close to airports. Furthermore, there are hints that the noise emission from such high-lift systems is lower than from a conventional wing with slotted slat and flap. The present paper shows the results of numerical and experimental investigations to understand the noise sources of a circulation control airfoil. Additionally the application of porous materials to the flap trailing edge is considered as a means for further noise reduction.
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