EA016290B1 - Wind electric generating plant - Google Patents

Abstract

The invention relates to wind electric generating plants and intended for converting wind energy into electric energy suitable for use in national economy. The claimed wind power plant comprises two or more wind powered engines with a circular guide connected into a common electric network, wherein wind powered engines of lesser diameter arranged inside wind powered engines of greater diameter, and dimensions of wind wheels, a number of blades and rotation frequency are selected so as to provide their interaction.

Description

The invention relates to wind farms and is intended to convert wind energy into energy useful for use in the national economy.

Known wind farms, consisting of several wind turbines installed next to each other and connected by a system of electric cables for collecting and transporting electricity. Each wind turbine in the process of creating turbulent turbulence of the wind flow associated with the fact that its blades move perpendicular to the direction of wind flow. This leads to the fact that during the construction of a wind farm in order to minimize the effect of wind turbines on each other, they are placed at a distance of not less than 6 diameters of the wind wheel (Internet site 1Shr: // \ y \ y \ y. \ Ushbepegdu. Kg / G11e8 / 1214827192_G11e. RBG).

So, for example, with a wind turbine power of 1.6 MW, with a wind wheel diameter of 82 m and the construction of a 40 MW wind farm, it is necessary to install 25 wind motors in a square with a side of 5-6-82 m = 2460 m.

Another drawback is that turbulent flows lead to the appearance of high-power noise, which does not allow the use of wind farms near settlements.

The objective of the proposed technical solution is to increase the efficiency of the wind farm, reducing the spatial dimensions of the station, its cost of manufacture and installation, as well as reducing the noise level during operation of the station.

The problem is solved by the fact that in the inventive device of the wind farm, wind motors with a vertical axis of rotation are used, which are combined in a structure that is largely devoid of the above disadvantages. Wind turbines with a vertical axis of rotation of a smaller diameter are placed inside the wind turbines of a larger diameter, and their sizes, number of blades and speed of rotation can be selected so that interaction occurs between them.

The concentric arrangement of the wind turbines alone will lead to a reduction in the area required for the wind farm. In such a wind farm, another effect is possible in the horizontal plane.

The invention is illustrated by drawings, which show:

FIG. 1 is a schematic view of a wind turbine with a vertical axis of rotation;

FIG. 2 is a schematic view of a top view of a wind turbine and the direction of a laminar wind flow;

FIG. 3 is a schematic representation of a wind farm in horizontal projection, consisting of 3 wind turbines with a vertical axis of rotation and a standing sound wave between them.

The most convenient for the implementation of this technical solution is the use of a wind turbine manufactured according to the Eurasian patent No. 009184 dated 12/28/2007. Bayaliev's wind turbine. This type of wind turbine can be made in the form of an annular structure (Fig. 1), on which rotating blades are mounted. The design is placed on the chassis installed directly on the site for mounting the wind turbine - on the ground, the roof of the building, etc. The torque from the chassis is transmitted to the electric power generator. The limiter ensures the stability of the structure during sudden gusts of wind, if the weight of the structure itself is not enough. This allows you to abandon the central shaft and simplifies the solution of the problem of building the Bayaliev Wind Farm - a concentric arrangement of two or more wind turbines. Other wind turbine solutions with combined vertical axes of rotation may also be used.

In FIG. 2 shows a schematic illustration of a wind turbine.

Each blade of a wind turbine, crossing the laminar wind flow perpendicular to its direction during rotation, excites turbulent flow oscillations, as well as sound waves. The frequency of flow interruptions excites wave oscillations with a frequency directly proportional to the frequency of rotation of the wind turbine and the number of blades:

Ev = Gd-Il - the frequency of the wave, where Gd - the frequency of rotation of the wind wheel, and IL - the number of blades of the wind wheel;

Gd = Ul / pb, where Ul is the linear speed of the blade, and b is the diameter of the wind wheel.

So:

Bv = Ul-Il / p-b.

The sound wavelength depends on the speed of sound and frequency:

Bv = Uzv / Ev, where Uzv is the speed of sound in the atmosphere;

Ev = b-Uzv-p- / Ul-Il.

It can be seen from the formula that the length of the sound wave generated by the wind turbine is directly proportional to the diameter of the wind turbine and the speed of sound in the atmosphere and inversely proportional to the number of blades and their linear speed, i.e. wind turbine speed.

Thus, by changing the diameter of the wind turbine and the number of blades of the wind wheel, you can change the length of the sound wave generated by its blades at the perpendicular intersection of the constant laminar wind flow. And by adjusting the speed (frequency) of rotation of the wind wheel, it is possible to achieve stabilization of the (relative) length of the excited wave, i.e., to obtain a standing wave.

- 1 016290

This phenomenon is proposed to be used in the proposed design of the wind farm. For this, it is necessary to place two or more wind turbines with a vertical axis of rotation so that the antinodes of the sound wave coincide with the zone of motion of the blades, and the nodes are between them. Each wind turbine in this case can be considered as a generator and receiver of sound vibrations.

A standing wave is a special case of a traveling wave arising from the addition and subtraction of waves that are close or multiple in frequency. Another way to increase the efficiency of a wind farm is to adjust the wind turbines of the wind farm in such a way that the frequencies of the generated sound waves by each wind turbine in the wind farm will lead to their resonant interaction. This will create conditions for the flow of energy between wind turbines and increase the overall power of the wind farm.

The energy of turbulent flows, which leads to the appearance of noise in classical wind farms, is used in this design to accelerate wind turbines and, therefore, to generate electric energy.

In FIG. 3 is a schematic representation of a wind farm consisting of 3 wind turbines. Wind turbines create a standing sound wave. The nodes of the standing wave coincide with the zones of motion of the blades, and the antinodes are located between them. In nodes, the wind speed is maximum, and in antinodes it is minimum. This makes it possible to increase the power of the wind farm, and hence its efficiency.

Smaller diameter wind turbines are located inside larger diameter wind turbines in such a way that the nodes of the standing wave that occurs when the blades cross the wind flow are located outside the rotation zones of the blades, and the antinodes are in the zones of rotation of the blades. Direction of rotation of wind turbines can be the same, but can be multidirectional. The number of blades in each wind turbine can be arbitrary. The wavelength generated is determined by the diameters of the wind turbines and the number of blades.

It is most convenient to use wind turbines with guides in the form of a ring, but traditional designs can be used to ensure the placement of one wind turbine inside another.

The torque can be transmitted to the electric generator by any method known in mechanical engineering.

An additional advantage of the claimed design is the simplicity of its manufacture, since there are no technical difficulties to increase the diameter of the wind wheel. The technologies have been developed and are similar to the methods used in the manufacture of rails for tram or railway tracks. The larger the diameter of the wind wheel, the greater the stability of the structure.

The concentric design principle of the wind farm saves space for its installation, and also creates convenience for the consumer to increase the power of the installation. To increase the power of the existing wind farm, just add one more ring.

Claims (3)

CLAIM 1. A wind farm containing at least two wind turbines with a vertical axis of rotation connected to a common electrical network, characterized in that wind turbines of smaller diameter are located inside wind turbines of larger diameter so that the blades of wind turbines are located in the antinodes of the standing sound wave excited by wind turbines. 2. Wind farm according to claim 1, characterized in that wind turbines are used with an annular guide. 3. Wind farm according to claim 1 or 2, characterized in that the dimensions of the wind wheels, the number of blades and their rotation speeds are chosen such as to ensure their interaction.