Swing Link Flexible Wind Tunnel Nozzle.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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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.
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