US Government As Represented by the Secretary of the Army

Donald V Rubin

Billy J Walker

A system for lowering the level of turbulence in an opening through a wall ver which air is flowing at a subsonic velocity wherein an arcuate flange is secured to the downstream edge of the opening and extends into the opening a distance of 0.11 to 0.22 times the length of opening in the direction air flow, the flange being tangent to the wall at the part of attachment of the branch.

Apparatus for acoustical quieting of a cavity

A system for lowering the level of turbulence in an opening over which a eam of air is flowing at a subsonic velocity wherein a fence positioned adjacent to the opening at an upstream location is provided with a plurality of apertures in the distal portion thereof. The apertures in the distal portion of the fence spread the shear layer of air flowing over the top edge of the fence and substantially reduce turbulence within the opening.

Growing community of inventors

Huntsville, AL, United States of America

Donald V Rubin