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Published in:
2006 | OriginalPaper | Chapter
Effect of Noise Reducing Modifications of the Slat on Aerodynamic Properties of the High-Lift System
Authors : Judith Ortmann, Jochen Wild
Published in: New Results in Numerical and Experimental Fluid Mechanics V
Publisher: Springer Berlin Heidelberg
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To minimize slat noise according to the guidelines of “A Vision for 2020” brush-like devices were installed on a slat trailing edge to “soften” it. In experiments slat noise was considerably reduced by such devices. But their effect on aerodynamics is yet unknown.
This study shows that the investigated brush-like devices on slat trailing edges influence the aerodynamic properties of high-lift systems adversely. Because of increasing boundary layer thickness with length and diameter of the brushes the suction peaks are reduced so that
C
C
decreases.
These are preliminary results. An optimization of slat chord length and brush length should be conducted to minimize
C
L
, reduction.