RU2240957C2 - Method for increasing of wing lift - Google Patents

Abstract

FIELD: heavier-then-air aircraft.

SUBSTANCE: the method consists in air bleeding from the wing upper surface through the orifices that are connected at least by one passage to the compressor or fan of the gas-turbine engine and form an inlet section of the air intake of the mentioned engine. Air is tapped from more than 20% of the wing upper surface. The orifices may have the shape of a slot and be positioned in several rows on the wing surface, and a double-flow turbo-jet engine may be used as the gas-turbine engine.

EFFECT: enhanced wing lift and improved aerodynamic characteristics.

4 cl, 2 dwg

Description

The invention relates to aircraft construction.

Known methods of mechanization of the wing: slats, flaps, flaps, deflectable socks (Aerodynamics of the aircraft. / Under the editorship of GN Kotelnikov. - Moscow, Military Publishing House, 1974, p. 81-83, fig. 4.27, fig. 4.28, fig. 4.30, Fig.4.32), allowing to increase the coefficient of lift of the wing Su _max .

A known method of suctioning the boundary layer (Aerodynamics of the aircraft. / Under the editorship of GN Kotelnikov. - Moscow, Military Publishing, 1974, p. 83, Fig. 4.33). The suction effect of the boundary layer is to remove the air most inhibited in the boundary layer, which leads to a shift of the separation point to the trailing edge of the wing and an increase in Cy _max .

A known method of blowing the boundary layer (Aerodynamics of the aircraft. / Under the editorship of GN Kotelnikov. - Moscow, Military Publishing, 1974, p. 84, Fig. 4.34). In this case, a gas jet is discharged into a narrow gap located along the trailing edge of the wing, as a result of which Cy _max increases.

A known method of protecting a gas turbine engine from foreign objects. The method consists in using air intakes located above the wing. The method is implemented on a MiG-29 aircraft.

Lifting force, as you know, is created due to the pressure difference under and above the wing. The greater this difference, the greater the lifting force.

The increase in the lifting force of the wing in the proposed method is achieved by the fact that air from more than 20% of the upper surface of the wing is sucked out through openings made on the specified surface into the gas turbine engine. If less than 20% of the areas are used for these purposes, a positive effect is not achieved due to insufficient throughput of the inlet openings (engines with high air flow rates lose inlet pressure due to the increased resistance of the openings, and motors with low air flow rates do not provide a noticeable increase lift).

Figure 1 shows a diagram of air sampling; figure 2 shows a vector diagram of the pressure distribution over the wing.

The circuit (Fig. 1) includes a wing 1 with holes 2 located on the upper surface, a channel 3 connecting the holes 2 to the inlet of the compressor (fan) of the gas turbine engine 4 and forming, together with the holes, the air intake of the engine.

The increase in the lifting force of the wing is as follows. When the engine 4 is operating, air from the upper surface of the wing is sucked into the engine, which leads to a decrease in pressure above the wing and, accordingly, an increase in lift.

Figure 2 shows a vector diagram of the pressure distribution over the wing (Aerodynamics of the aircraft. / Ed. By G. N. Kotelnikov. - Moscow, Military Publishing House, 1974, p. 64, Fig. 4.5) in the absence of air sampling (solid line) and at air sampling (dashed line).

The application of this method will allow:

1. Increase the lift of the aircraft at low and medium subsonic flight speeds.

2. Reduce the likelihood of foreign objects getting into the gas turbine engine (due to the upper position of the air intake).

Improving the aerodynamic characteristics of the wing can be achieved by changing the shape of the holes (slotted holes) and their location on the wing surface (in several rows). As a gas turbine engine, it is recommended to use a dual-circuit turbojet engine with increased air flow.

Claims (4)

1. The method of increasing the lifting force of the wing, which consists in taking air from the upper surface of the wing through openings that are connected by at least one channel to the compressor or fan of the gas turbine engine and form an inlet section of the air intake of the specified engine, characterized in that the air is taken more than with 20% of the indicated surface. 2. The method of increasing the lifting force of a wing according to claim 1, characterized in that the holes are in the form of slots. 3. The method of increasing the lifting force of a wing according to claim 1, characterized in that the holes are arranged in several rows. 4. The method of increasing the lifting force of a wing according to claim 1, characterized in that the gas turbine engine is a dual-circuit turbojet engine.

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