Method and device for varying lift

FIELD: transport.

SUBSTANCE: invention relates to aviation. The method of varying the lift of a body in flowing medium consists in affecting the flow by one or several flexible tape-like spaced elements extending from the body surface flown over by the said medium. The device is also proposed incorporating one or several flexible tape-like spaced elements extending from the body surface flown over by the flowing medium.

EFFECT: reduction of drag.

9 cl, 2 dwg

 

The invention relates to vehicles and can be used in devices to control the change in the lifting force to the body in the fluid flow.

A prototype of the selected method, according to which the increase in lifting force and control the aerodynamic characteristics of the wing carried out using multiple retractable hard rods placed inside the area of separation of flow along the entire span of the wing parallel to the front edge of the wing on the line spreading three-dimensional reverse current (see Russian patent No. 2128601).

This method of control stall, thereby lifting force based on the results of experimental studies of the pattern of the flow at the stall, which showed that, for example, over the wing in the area of stall there are two large-scale vortex, rotating in opposite directions in the plane of the wing, under the influence of which flow on the surface of the wing moves from the rear edge of the wing to the front, and then spreads onlines spreading from the center to the edges of the wing. The elements that are differentially nominated and installed on this line are spreading bring an additional perturbation in the course depending on their number and let's accession stream as part of, or all over the aerodynamic surface.

The disadvantage of the prototype is that these elements are rigid and can only be installed on a predetermined line of the three-dimensional spreading of the return flow.

With the rigidity of the protruding elements used in the prototype affects the surface material of the body and also increases the frontal aerodynamic resistance of the whole structure.

At the same time, according to theorem Zhukovsky, the magnitude of the lifting force is proportional to the density of the medium, flow rate and the circulation flow rate.

Figure 1 shows the flow profile of an airplane wing Y - wing lift). The speed of the flow on the lower surface of the aerodynamic body is less than the flow velocity on the upper surface of the aerodynamic body (Vn<Vin), and the pressure on the lower surface of the aerodynamic body is greater than the pressure on the upper surface of the aerodynamic body (pn>pin). The lift force is expressed by the following ratio:

where Y - wing lift;

cy- the dimensionless lift coefficient, which depends, in General, from body shape, its orientation in the environment and the Reynolds number Re and Mach M;

ρ - density environment;

S - value characteristic for body area (e.g., wing area in sq is not);

v is the velocity of flow.

The value of cydetermine theoretical calculation or experimentally. So, according to theory of Zhukovsky, for the wing in the plane-parallel flow at small angles of attack

where m is the coefficient depending on the shape of the wing profile, for example, for thin weakly curved plate m=p;

a - angle of attack (the angle between the direction of the flow velocity and the chord of the wing);

and0- the angle of zero lift.

Thus, any change in the shape of the body, including through flexible retractable elements, leads to a change in the lifting force.

The technical task of the present invention was a method and device for changing the magnitude of the lifting force and to control the dynamic characteristics of the body in the fluid flow.

Mentioned technical problem is solved by the fact that, according to the method of changing the lifting force to the body in the fluid flow, which affect the flow through one or more spaced apart elements, sliding from a streamlined flow surface of the body, the sliding elements are flexible.

Preferably, at least one flexible element is performed with a circular cross section. As a variant, at least one flexible El kelaa the UNT perform with a polygonal cross-section. In this case, at least one flexible element may be in the form of a flexible tape.

Mostly, the body is a wing of the plane.

Preferably, use a variety of flexible elements that are installed throughout a streamlined flow surface. Alternatively, use a variety of flexible elements mounted on part of a streamlined flow surface. This flexible element is rigidly attached to the rod end through which the flexible element put forward by the specified distance above mentioned streamlined flow surface.

Preferably, the measurement condition of the flow stream surface is performed with the use of sensors.

Mentioned technical problem is also achieved through the creation of a device to change the lifting force to the body in the fluid flow, which according to the invention contains one or more elements, sliding from a streamlined flow surface of the body, and the aforementioned sliding elements are made flexible.

Preferably, the cross-section, at least one retractable flexible element is round. Alternatively, the cross-section, at least one retractable flexible element is polygonal. In this case, at least one flexible element may be a flexible linen is near.

Primarily, the device is a device to change the lifting force of the wing.

Preferably, a range of flexible elements are installed throughout a streamlined flow surface. Alternatively, a range of flexible elements mounted on part of a streamlined flow surface. While the flexible element can be rigidly attached to the end of the rod, mounted under a streamlined flow surface through which the flexible element is shifted by a given distance above mentioned streamlined flow surface.

These characteristics have been identified in other technical solutions in the study of the level of the art and, therefore, the decision is novel and involves an inventive step.

Hereinafter the invention will be described in more detail with reference to the accompanying drawings, on which:

Figure 1 - diagram of the flow profile of the aerodynamic surface; and

Figure 2 - schematic view of a variant of embodiment of the present invention.

In accordance with the method according to the present invention, which is designed to change the lifting force to the body in the flow of the fluid to flow directly affect one or more distant from each other sliding elements 1 (see figure 2), which protrude from the streamlined surface 2 is aerodynamic the th body and made flexible. While the cross-section of the flexible element 1 can have any suitable shape, for example, it can be done with a circular cross section or a polygonal cross-section. If necessary, the flexible elements 1 can be made in the form of flexible tapes produced at a given distance from the aerodynamic surface 2. In a particular variant embodiment of the invention the body is a wing of the plane.

In another preferred variant of embodiment of the multiple flexible elements 1 are installed throughout a streamlined flow surface 2. However, they can defend from each other at equal distances. In another variant embodiment of the multiple flexible elements 1 are installed only in defined parts of the streamlined flow surface 2.

One of the possible devices for advancing the flexible element may be moving in the groove 3 stem 4, the end of which is attached a flexible element. When this groove 3 coincides in form with a retractable flexible element and allows it to run smoothly over the surface 2 of the body.

You can measure the state of the flow stream surface using any known in the art suitable sensors.

Device for changing the lifting force to the body in the fluid flow according to the invention contains one or more kind of hausas flexible elements 1. Flexible elements 1, as already mentioned, have any suitable cross section, for example circular or polygonal.

According to one preferred variant embodiment of the invention, the device for changing the lifting force is a device to change the lifting force of the wing.

As already mentioned, many flexible elements 1 may be performed either on the whole streamlined flow surface 2 or part a streamlined flow surface.

In the device according to the invention to propose a flexible elements 1 can be used moving in the groove 3 stem 4, the end of which is attached a flexible element 1. When this groove 3 coincides in form with a retractable flexible element 1 and allows it to run smoothly over the surface of the body.

Although the device and method according to the present invention is described in preferred embodiments, specialists in the art will obviously many changes and modifications included in the scope of the present invention.

1. How to change the lifting force to the body in the fluid flow, which affect the flow through one or more spaced apart elements, sliding from a streamlined flow surface of the body, characterized in that the sliding elements made in view of the flexible tape.

2. The method according to claim 1, characterized in that as the body use the wing of the plane.

3. The method according to claim 1, characterized in that use many flexible elements mounted on part of a streamlined flow surface.

4. The method according to claim 1, characterized in that the flexible element is rigidly attached to the rod end through which the flexible element put forward by the specified distance above mentioned streamlined flow surface.

5. The method according to any of the preceding paragraphs, characterized in that measure the state of the flow stream surface using sensors.

6. Device for changing the lifting force to the body in the flow of the fluid containing one or more elements, sliding from a streamlined flow surface of the body, characterized in that the said sliding elements made in the form of flexible tapes.

7. The device according to claim 6, characterized in that it is a device to change the lifting force of the wing.

8. The device according to claim 6, characterized in that the set of flexible elements mounted on part of a streamlined flow surface.

9. The device according to claim 6, characterized in that the flexible element is rigidly attached to the end of the rod, mounted under a streamlined flow surface through which the flexible element is shifted by the specified rasstoianiia mentioned streamlined flow surface.



 

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