PERFORATED STRUCTURE OF COVERING FOR SYSTEMS WITH A LAMINAR FLOW Russian patent published in 2008 - IPC B64C21/06 

FIELD: engines and pumps.

SUBSTANCE: exterior covering (100) of an aircraft (40) has perforated apertures, arranged along a wing span in groups or in bundles (250). Each perforated aperture represents a micro slit with a length from 100 to 3000 mcm and a width from 50 to 250 mcm. To provide control of a boundary layer, air is sucked off the latter through micro slits, the said boundary layer flowing around the exterior covering. The layout of arrangement, size and orientation of each bundle are designed to provide interference with mutual slackening of a flow disturbance, caused by suction. Spatial spectrum of perforated apertures arrangement layout is characterized by lack of meaningful energy at specified wave lengths of a predefined instabilities of a flow. An aero dynamical body additionally comprises stiff ribs, running parallel to bundles (250) of rows of perforated apertures, and a perforated interior plate (400) insuring a throttle control of a portion of a flow sucked off through groups of bundles.

EFFECT: inventions are designed to minimize disturbance of flow instabilities in a boundary layer.

31 cl, 16 dwg