RU2708999C1 - Flexible air-impermeable wing - Google Patents

Abstract

FIELD: aeronautics.

SUBSTANCE: proposed wing of flexible airtight material includes air intake in form of profile nose, and in its upper and lower parts, towards each other, there are webs of valves made of flexible airtight material, with possibility of its overlapping inside shell.

EFFECT: invention is aimed at improvement of aerodynamic characteristics.

1 cl, 4 dwg

Description

The present invention relates to sports aviation, in particular, to the production of paragliders, parachutes, kites and can be used in their development, production, sale, operation.

Currently known sports paragliders, wing parachutes, paraffoy kites include a flexible shell, inside which there is a set of ribs dividing the shell into sections and defining an aerodynamic profile to achieve high aerodynamic characteristics. (https://studopedia.ru/11_84210_ustroystvo-parashyuta-tipa-krilo. html)

There are slots (openings) in the nose of the profile, which are air intakes through which the incoming air stream creates excessive pressure inside the shell, forming a profile defined by the ribs.

The disadvantages of the known designs are:

- distortion by the air intakes of the shape of the nose of the profile creates additional drag, which reduces the characteristics of the structure;

- reducing the area of the air intakes in order to minimize losses, leads to a deterioration of the filling of the shell, and also reduces the range of angles of attack, when the area near the point of inhibition of the flow, where the air pressure exceeds atmospheric, is in the alignment of the air intake.

This leads to the fact that when the point of maximum pressure leaves the air intake, the external pressure becomes higher than the internal pressure and the shell loses its shape. The dome is added, leading to a deviation from the course, access to dangerous flight modes and sometimes irreversible obfuscation.

This drawback is resolved in the design of the paraglider, in which the profile toe has a concave shape, which allows to reduce the movement of the braking point (http://www.parapentemag.fr/7page_id)

The known shape of the sock, due to flow inhibition in the concave part of the sock, can reduce the movement of the braking point and a slight increase in pressure in this region of the profile, however, it is not possible to avoid increasing the relatively clean profile, resistance.

The closest in technical essence to the proposed technical solution is a wing made of a flexible, airtight material containing a shell with an aerodynamic profile, its ribs and an air intake with valves, designed to inflate the shell and slings with an oncoming air flow (see patent No. 2527407 according to class B64C 3/30, 2012 g)

The disadvantages of the known design are:

- lack of reliability;

- the pressure inside the wing is lower than the total braking pressure;

- additional, compared with a clean profile, resistance,

- the initial filling of the wing with air is difficult due to the small width of the air intakes.

The technical result solved by the invention is to improve the aerodynamic characteristics of the wing of a flexible, airtight material

The technical result in the present invention is achieved by creating a wing of a flexible, airtight material containing a shell with an aerodynamic profile formed by the inside of the shell, ribs and an air intake with valves, designed to inflate the airflow of the shell and slings, in which, according to the invention, the air intake is made in in the form of a profile toe made of breathable material, and in the upper and lower parts, towards each other, valve webs are fixed, made x of a flexible airtight material, with the possibility of overlap within the shell.

The present invention improves the resistance to wing folding, due to the increase in pressure inside the wing to the value of the total braking pressure in the entire possible range of angles of attack and flight modes,

The present invention allows for rapid initial air filling.

The essence of the claimed invention is illustrated by the following description and graphic materials, where

In FIG. 1 is a drawing of a section in working condition.

In FIG. 2 is a sectional view of the front portion when filling a wing of a flexible, airtight material.

In FIG. 3 - section of the front of the wing when flying at maximum speed.

In FIG. 4 - section of the front of the wing when flying at the maximum angle of attack.

The flexible wing contains a casing 1 of airtight material, dividing it into sections of the ribs 2, having the shape of an aerodynamic profile and an air intake with valves, designed to inflate the casing with an onward flow of air, and slings.

The air intake is made in the form of a sock profile 3 of breathable material with a gap 4.

The valves are made in the form of upper 5 and lower 6 webs of flexible airtight material, with one end of each sheet mounted on the nose of the profile 3 with the possibility of its overlap inside the shell 1

Outside of the casing 1, slings 7 are fixed below

The wing of a flexible, airtight material is as follows.

In being in the air stream 8, under its influence, the upper sheet 5 and the lower sheet 6 are pulled into the shell 1, passing the air stream 8 filling the shell 1, creating a minimum resistance and increasing the filling speed of the shell 1

As the shell 1 is filled, the pressure inside it increases, and the webs 5 and 6 are pressed from the inside to the surface of the sock 3 in the areas of the slit 4, where the internal pressure 9 exceeds the external pressure 10, until the valve webs 5, 6 converge at the braking point 11, where the full braking pressure 12 is applied, and the pressure inside the shell 1 is equal to the full braking pressure 12, and the valve web 5.6 completely closes the gap 4 preventing the possible leakage of air from the shell 1.

When the angle of attack changes, the braking point 11 moves along the nose of the profile 3, and the valve web 5 and 6, being inside the shell 1, under the influence of the full braking pressure 12 over the entire area of the air intake, and equal external pressure is applied only at the new braking point 11 are deformed, converging at a new braking point 11.

The width of the slit 4 is selected from the condition of ensuring the possible movement of the braking point 11 in the entire range of angles of attack, so that the pressure inside the shell 1 always remains equal to the total braking pressure 12.

The different positions of the braking point 11 in different sections of the flexible wing in terms of span correspond to different positions of the convergence of the upper 5 and lower 6 blades, and the pressure inside the wing always remains as high as possible, equal to the pressure head.

Thus, the outflow of air from the shell 1, and, as a consequence, the possibility of complete or partial folding of the wing is excluded under any flight conditions, including turbulence, since the pressure inside the shell 1, equal to the total braking pressure 12, exceeds the external pressure everywhere except braking point 11.

A sufficient width of the slit 4, provides quick initial air filling and the adoption of the working condition of the wing of a flexible, airtight material, allow the invention to be used, including in parachute techniques.

Cloths 5 and 6 of the valve, pressed, in working condition, to the toe of profile 3 from the inside, form a smooth, without cracks, toe of the aerodynamic profile, which provides the smoothest flow around and minimal drag of the flexible wing.

The maximum achievable internal pressure equal to the total braking pressure 12 inside the wing shell 1, provides its maximum rigidity and reduces the required number of lines, which also helps to reduce drag and increase the aerodynamic quality of the flexible wing.

The proposed solution was tested experimentally on a prototype, which is a rigid fragment of the aerodynamic profile with end ribs at the ends, one of which is equipped with a hole with the possibility of overlapping, and a gap in the nose of the profile 3, covered with flexible cloths.

The model was placed in an air stream at a speed of up to 40 m / s.

With an open hole in the end rib, air freely passed into the layout through the cracks in the nose of the profile, going out through the hole in the end rib.

Cloths, at the same time, were located along the air flow inside the layout, leaving the slots in the toe fully open.

When the hole in the end rib was blocked, the air inside the model created excessive pressure, under the influence of which, the valve blades, moving towards the flow, blocked the gap in the toe, converging along the line corresponding to the position of the braking points in span.

With an increase in the angle of attack, the upper 5 cloth of the valve overlaps most of the slots in the nose, and the lower 6 cloth, respectively, is smaller, and the line of convergence moved along the profile down and back, and when the angle of attack decreases, on the contrary, up.

In the entire range of angles of attack, no air leakage through the intake valve was observed.

Claims (1)

A wing made of a flexible, airtight material, containing a shell with an aerodynamic profile, installed inside it and forming a rib profile and an air intake with valves, designed to inflate a counter flow of air of the shell, characterized in that the air intake is made in the form of a profile toe made of breathable material, and in the upper and its lower parts, towards each other, fixed valve sheets made of flexible airtight material, with the possibility of its overlapping inside the shells and.

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