The Boeing Company

Deutsche Forschungsanstalt Fur Luft-Und Raumfahrt E.v.

Nord-Micro Ag & Co. Ohg

Wolfgang Neise

Richard A Black

Yeu-chuan Hsia

Herbert Louis Hoffman

Martin Steinert

Naval Kishore Agarwal

Wendell R Miller

Pat D Parkin

Frederick R Helms

Wen-Hwang Lin

Roy Hai-Tien Loh

F Wayne Hollatz

Ulf Michel

Robert J Devitis

Frank Arnold

Frank Kameier

Yeu-Chuan Hsia

Wayne F Hollatz

A valve is provided for controlling a flow of a fluid between a first environment and a second environment. The valve includes a frame adapted to fit within a perimeter of an aperture in a divider separating the first environment from the second environment. The valve additionally includes a first gate movable within the frame to control a flow of the fluid through the aperture between the first environment and the second environment. The first gate includes a substantially aerodynamically clean surface substantially free from protrusions disrupting the flow of the fluid over the first gate surface. Additionally, the first gate includes a trailing edge having a baffle adapted to cover an aft edge of the frame when the first gate is positioned to have a small opening angle. The baffle includes a plurality of 3-D notches in a front side of the baffle. The valve further includes a second gate movable within the frame to control a flow of the fluid through the aperture between the first environment and the second environment. The second gate also includes a substantially aerodynamically clean surface substantially free from protrusions disrupting the flow of the fluid over the second gate surface. Additionally, the second gate includes a trailing edge comprising a plurality of 3-D notches in a front side of the trailing edge.

Fluid control valve

An axial flow machine (1) having a rotor (2) that rotates about a fixed axis (5) the rotor having a number of blades (4), and a casing (3), radially surrounding the rotor (2). A turbulence generator (14) is positioned in a ring-shaped gap (9) formed between the tips (7) of the blades (4) and the inner surface (8) of the casing (3) to limit the sound emission of the flow machine (1).

Method for the reduction of sound emission as well as for the

Growing community of inventors

Berlin, Germany

Wolfgang Neise