Accession Number : ADP004790

Title :   Experimental Study of Vortical Features in Three-Dimensional Separated Flows,

Corporate Author : DEUTSCHE FORSCHUNGS- UND VERSUCHSANSTALT FUER LUFT- UND RAUMFAHRT E V GOETTINGEN (GERMANY F R)

Personal Author(s) : Bippes,H.

Report Date : AUG 1984

Pagination or Media Count : 21

Abstract : Possible topological structures of three-dimensional separated flows are studied on a hemisphere-cylinder at incidence. By means of a systematic variation of flow parameters a manifold of skin-friction patterns is produced. It is established that they develop from three basic structures simply by successive splitting of saddles in saddle-node-saddle combinations. The adjoining spatial flow field is visualized in low Reynolds number water tunnel flow, where similar kind of skin friction pattern develops as in fully turbulent flow. Velocity field measurements in the separated region on a rectangular wing indicate that on both models a similar topological structure, including unsteady effects, is possible. (Author)

Descriptors :   *GAS FLOW, *FLOW SEPARATION, THREE DIMENSIONAL, FLOW FIELDS, WATER TUNNELS, REYNOLDS NUMBER

Distribution Statement : APPROVED FOR PUBLIC RELEASE