Accession Number:

AD0754987

Title:

Dreidimensionale Stoerungen in der Grenzschict an einer Konkaven Wand (Three-Dimensional Disturbances in the Boundary Layer Along a Concave Wall),

Descriptive Note:

Corporate Author:

DEUTSCHE FORSCHUNGS- UND VERSUCHSANSTALT FUER LUFT- UND RAUMFAHRT E V FREIBURG IM BREISGAU (WEST GERMANY)

Personal Author(s):

Report Date:

1971-11-09

Pagination or Media Count:

18.0

Abstract:

The development of three-dimensional disturbances in the boundary layer along a concave wall was studied experimentally. Measurements of velocity distributions in the unstable boundary layer and of the amplification of small, forced, initial disturbances were made by photogrammetric evaluation of stereo-photographs. The flow was made visible by the hydrogen-bubble method. A comparison is made with the linearized theory. In the nonlinear part of the amplification, a secondary instability has been observed occurring in the longitudinal zones of low velocity U. A meandering motion ultimately leads to the laminar-to-turbulent transition. Author

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE