Literature on transonic flutter characteristics of wings, especially the transonic dip phenomenon in the flutter boundaries, was reviewed. The transonic dip occurs most distinctly with sweptback wings. The dip is caused by the phase lag of the lift due to the fundamental wing bending mode and corresponds to a single-mode flutter mechanism. The dip can be predicted qualitatively using methods for inviscid transonic unsteady air loads. Quasi-steady transonic methods are not wholly reliable. The dip becomes relatively deeper with increasing wing-to-air mass ratio. The dip can become more pronounced for a supercritical wing than for a conventional wing. The dip occurs at design conditions as well as off-design conditions. In case of flow separation, a narrow dip which depends strongly on boundary layer conditions and the spatial distribution of the separated flow can occur.
Aeroelastic Properties of Wings in Transonic Flow
1981
51 pages
Report
No indication
English
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