RU2384730C2 - Prof merkulov's windmill plant - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: invention relates to soft power production, particularly to wind-power engineering. Proposed plant comprises windmill consisting of blades to take up wind energy that are coupled with electromechanical converters. Note here that windmill blades are fixed to perform bending oscillations across wind flow and torsion oscillations (flutter) about its axis of rigidity. Windmill is arranged in net cells to turn, wind-driven, about vertical axis through 180°. For this blades are fitted behind the axis of turn.

EFFECT: reduced metal input and higher efficiency, hence, higher specific power output.

2 cl, 4 dwg

Description

The invention relates to the field of renewable energy, in particular, to wind energy, and more particularly, to wind energy installations and can find application in the national economy for generating electricity.

Known wind power installation (SU No. 1645603, F03D 11/00, 30.04.91), in which it is proposed to install wind generators in the mesh cells, and the grid with the help of masts and braces to be mounted on a turntable.

Known electrostatic capacitive machine for converting the energy of the wind flow (RF No. 2241300, H02N 1/08, 11/27/04), consisting of an air channel that captures, focuses and directs the air flow to the moving electrodes of the capacitive electromechanical converter. The air flow causes transverse vibrations of the moving electrodes, due to which there is a conversion of wind energy into electrical energy.

The disadvantage of these devices is their large consumption of materials, low efficiency and, as a result, low specific power.

Known wind power installation containing wind generators, consisting of blades that receive wind energy, and associated transducers, while the wind generators are placed in the mesh cells, and the grid with the help of masts and extensions is stretched on frames mounted on one mast in perpendicular vertical planes, along in at least one row (SU 1793095, F03D 3/00, 02/07/1992).

The disadvantage of this device is the presence of a bearing assembly in each wind generator, which increases the material consumption of the device and reduces its resource.

The objective of the invention is to simplify the design, increase resource, reduce material consumption and, as a result, reduce the cost of a unit of installed capacity.

At the same time, the ability of the blades to oscillate under the influence of wind is used as a way of the device’s operation, for which the blades themselves are fixed so that they can perform flexural-torsional vibrations (flutter), and the inertial, elastic and geometric parameters of the blades are selected from the condition of the maximum energy conversion coefficient wind into the vibration energy of the blades and associated electromechanical converters.

Replacing rotation with vibration allows us to simplify the design and reduce the size of wind generators, which leads to a decrease in the material consumption of the device and an increase in its resource.

Wind generators are placed in mesh cells, mounted on fixed masts with the possibility of rotation around the vertical axis by 180 ° under the influence of wind, for which the wind generator blades are located behind the axis of rotation.

The nets with the help of masts and extensions are posted in several rows with a certain interval between them, and one row system is located perpendicular to another row system.

The invention is illustrated in Fig.1-3.

In figure 1. shows a diagram of a wind generator in two projections, which consists of a housing 1, a drive 2, a torsion shaft 3, a blade 4, a stiffness axis 5, and an electromechanical converter 6.

Figure 2 presents the appearance of the wind generator in two projections.

Figure 3 shows a multi-mast wind power installation.

Installation works as follows.

The air flow running on the blade 4 causes bending transverse to the flow and torsional around the axis of rigidity of the blade 4 vibrations (flutter). Through the drive 2, these vibrations are transmitted to the electromechanical converter 6.

Inertial, elastic and geometric parameters of the blades are selected according to this criterion:

mI = (K _h / m-ω ² ) (K _α / I-ω ² ) -S ² ω ⁴ = 0,

where: ω is the oscillation frequency of the blade, 1 / s,

m is the mass of the blade, kg

I is the moment of inertia of the blade relative to its own axis of rigidity, kg · m ² ,

To _α - torsional rigidity of the blade relative to this axis, N · m,

where: N = kgm / s ²

S - static imbalance of the blade relative to this axis, kg · m,

K _h - the rigidity of the mounting of the blades to the shaft, N / m

This condition provides the occurrence and maintenance of bending-torsional vibrations of the wings of the wind generator, physically corresponds to the condition for the appearance of resonance between bending and torsional vibrations, see the monograph by R.L. Bislinghoff, X. Ashley and R.L. Halfle. Aeroelasticity, silt, M. 1958, 800 p. (p. 465, formulas 9-13a, 9-13b).

In the event that the geometric and stiffness parameters of the wings of the wind generator do not satisfy this condition, the oscillations of the wings are not excited.

In addition, the width of the blade In and the amplitude of the oscillations of the end of the blade N must satisfy this ratio:

HB = U ² / πω ² ,

where: U - wind speed.

This condition provides the maximum theoretically achievable efficiency of the wind generator, equal to 0.5, and is obtained using formulas 5-345 and 5-346 of the monograph cited above (p. 244).

If you violate this relationship between the frequency, amplitude and width of the blade, the efficiency will decrease.

Wind generators are placed in the mesh cells with the possibility of rotation around the vertical axis by 180 ° under the influence of wind, for which the blades are located behind the axis of rotation (Figure 2).

Long networks with the help of masts and extensions are hung in several rows with a certain interval between them, and one row system is located perpendicular to another row system (Figure 3).

A long network can be stretched across the mountain gorge, which allows the use of constantly blowing winds in the mountain gorge.

Using the present invention makes it possible to efficiently use the energy of the translational movement of the wind flow.

Claims (2)

1. A wind power installation containing a wind generator, consisting of blades that receive wind energy and associated electromechanical transducers, characterized in that the wind generator blades are fixed so that they are able to perform bending across the flow and torsional vibrations (flutter) along its own axis of rigidity, while the inertial, elastic and geometric parameters of the blades are selected from the conditions
mI = (K _h / m-ω ² ) (K _α / I-ω ² ) -S ² ω ⁴ = 0,
where ω is the oscillation frequency of the blade, 1 / s;
m is the mass of the blade, kg;
I is the moment of inertia of the blade relative to its own axis of rigidity, kg · m ² ;
To _α - torsional stiffness of the blade relative to this axis, N · m;
S - static imbalance of the blade relative to this axis, kg · m;
K _h - the rigidity of the mounting of the blades to the shaft, N / m,
while the wind generator (s) is located (s) in the grid cells with the possibility of rotation around the vertical axis by 180 ° under the influence of wind, for which the blades are located behind the axis of rotation. 2. Wind power installation according to claim 1, characterized in that the network with the help of masts and extensions is posted in several rows with a certain interval between them, and one row system is located perpendicular to another row system.

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