T.M. Fischer, S. Hein, U. Dallmann

Some characteristic features of the fluctuating part of a three-dimensional boundary layer are described within the framework of a secondary stability theory. The frequency and amplification of secondary disturbances and the spatial structures produced by these disturbances are considered. In particular, the spatial distribution of the rms fluctuation calculated from two low-frequency secondary disturbance modes is compared with the measured rms fluctuation, where the stationary vortices have been excited artificially in the experiment. Furthermore, a strong high-frequency secondary instability is predicted by the theory for amplitudes of the primary stationary vortices larger than about 10%. The features of this instability are discussed and compared with those obtained from the low-frequency secondary disturbances.

8. DGLR-Fach-Symposium, Köln, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 6 Seiten

DGLR-Bericht, 1992, 1992-07, Strömungen mit Ablösung; S.423-428; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aerodynamics, turbulence models

Bestellbar

1992