초록 ▼

A basic airfoil has its operating performance improved by incorporating one or more apertures in the airfoil adjacent its trailing edge. These apertures extend from the upper surface of the airfoil down through to the lower surface of the airfoil. The entry port and the exit port of these apertures

A basic airfoil has its operating performance improved by incorporating one or more apertures in the airfoil adjacent its trailing edge. These apertures extend from the upper surface of the airfoil down through to the lower surface of the airfoil. The entry port and the exit port of these apertures has a greater circumference than that of the throat circumference which is intermediate thereto. This structure forms a venturi having a vertical axis. Spaced below the throat of the aperture are a plurality of air nozzles that communicate with an air plenum chamber within the airfoil. A source of pressurized air is connected to the plenum chamber. The leading edge of the airfoil causes air to flow across both the upper surface and lower surface of the airfoil. The venturi creates a strong suction on the upper surface of the airfoil to enhance the airfoil\s pressure differential. When the axis of the venturi is inclined forwardly with respect to the horizontal axis of the airfoil, a vector thrust in the forward direction is created in the same direction as that of the low pressure side of the airfoil. The venturi enhanced airfoil can be utilized both in a horizontal fixed airfoil or its structure can also be incorporated into the tail rudder of an aircraft or helicopter. The venturi enhanced airfoil can be oriented in any position between the horizontal and vertical axes.

대표청구항 ▼

An aircraft comprising: an airfoil, said airfoil defining an upper surface, a lower surface, a leading edge, and a trailing edge, said airfoil further defining a slot extending therethrough between said upper surface and said lower surface, said slot thus defining an entrance port in said upper surf

An aircraft comprising: an airfoil, said airfoil defining an upper surface, a lower surface, a leading edge, and a trailing edge, said airfoil further defining a slot extending therethrough between said upper surface and said lower surface, said slot thus defining an entrance port in said upper surface and an exit port in said lower surface, said exit port being located farther aft on said airfoil than said entrance port, said slot being located adjacent to said tailing edge and defined by a throat portion, a converging portion extending from said entrance port and converging inwardly toward said throat portion, and a diverging portion extending from said throat portion and diverging outwardly therefrom toward said exit port, said diverging portion terminating on said lower surface, said airfoil further defining a first plenum chamber located adjacent to said slot, and a plurality of ejector nozzles extending through a wall defining said slot, said ejector nozzles being in fluid communication with said first plenum chamber; and means for supplying pressurized gas coupled to said first plenum chamber, said first plenum chamber in turn ejecting the pressurized gas through said ejector nozzles and into said diverging portion of said slot.