Accession Number : ADD010562

Title :   Swing Link Flexible Wind Tunnel Nozzle.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Jacocks,James L ; Henderson,Henry L

Report Date : 16 Aug 1983

Pagination or Media Count : 7

Abstract : A flexible duct for conveying a gaseous flow, with the duct useable as the flexible nozzle in as wind tunnel. The duct includes a flexible plate member which is attached at the downstream end to a frame support member, with the upstream end of the flexible plate member being slideable and pivotable upon a member attached to the frame support member. A plurality of swing link members in spaced-apart relationship are pivotally connected at one end to the flexible plate member, and pivotally connected at the other end to a translatable and rotatable cradle-like member which is supported by crank members from the frame support member. An actuator is used to selectively move the cradle-like member. The resultant movement of the cradle-like member causes the flexible plate member of deflect, resulting in predetermined contours (and profiles) of the flexible plate member. If the duct is used oas the flexible nozzle of a wind tunnel, this contouring of the flexible plate member allows generation of a large range of uniform velocities at the downstream exit end of teh duct which is communication with the testing section of the wind tunnel.

Descriptors :   *Patents, *Wind tunnel nozzles, *Flexible structures, *Duct inlets, Walls, Plates, Linkages, Frames, Supports, Pivots, Ducts, Contours, Modification, Nozzle gas flow

Subject Categories : Couplers, Fasteners, and Joints
      Structural Engineering and Building Technology
      Test Facilities, Equipment and Methods
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE