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INVENTION
Russian Federation Patent RU2075631
Wind turbine
Name of the inventor: Zabegaev AI .; Zabegaev NI .; Gorbunov YN .; Anop VM .; Dyomkin VV .; Novak YI .; Sable YG
The name of the patentee: Limited Liability Company - firm "Obschemash- engineering"; Scientific and Production Association "VETROEN"
Address for correspondence:
Starting date of the patent: 1994.04.07
Use: wind turbines are in the wind industry. The inventive wind turbine has a horizontal shaft 5 mounted thereon at a distance from one another two propeller 1, 2 provided with blades. 1 propeller 2 fixed rigidly to the shaft 5, with one blade in the wind direction relative to the propeller blades of one propeller are displaced in the circumferential direction 2 toward windwheels rotation through an angle a, defined by the relation 
where b max - chord blade propeller to its maximum cross-section, R-radius of maximum wind wheel and the distance between the propeller 1 and 2 comply with the relevant (0,6 ... 1,8) b max. The blades of the first propeller 1 are made with wedge angles greater than corresponding angles of the blades jamming second propeller 2. 2 ... 10 degrees.
DESCRIPTION OF THE INVENTION
The invention relates to wind power engineering and can be used in wind power plants with a horizontal axis of rotation. Known wind turbine comprising a horizontal shaft and mounted thereon two propeller blades. (AS N 1286804, cl. the F 03 D 7/02, 1985).
The disadvantage of this wind turbine is that it first in the direction of the wind relative to the second propeller wind wheel is set arbitrarily.
The blades of the second propeller may be in the wind shadow from the blades of the first propeller, causing the two-section windwheels used a suboptimal way, which reduces the efficiency of the use of such prior art solutions and, accordingly, reduces its power.
Thus, the total power developed in this double wind wheel is smaller than the force developed by the two separately mounted propeller.
The purpose of the invention is to increase the power of the wind turbine and wind energy utilization while reducing lateral dimensions propeller and expanding the range of operating speeds of wind flows.
The goal is achieved due to the fact propeller 1 and 2 are fixed rigidly to the shaft 5, the blades of the first propeller downwind offset relative to one second propeller blades 2 in the circumferential direction in the direction of rotation windwheels an angle a, defined by the relation
where b max -horda blade propeller to its maximum cross-section,
R-maximum radius of the wind wheel,
and the distance eyelids propeller 1 and 2 is made integral (0,6.1,8) b max.
The blades of the first propeller 1 are made with wedge angles greater than corresponding angles of the blades jamming second propeller 2 at 2.10 o.
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FIG. 1 schematically shows a general view of the propeller claimed in FIG. 2 is a section B-B in FIG. 3 cross section B-B and a flow diagram of the propeller blades the air flow in the rotation operation of a wind turbine. Wind turbine propeller contains 1 and 2 with the blades 3 and 4, the shaft 5, the rotary gondola 6 and 7 tower. |
Wind turbine has a horizontal shaft 5 mounted thereon at a distance from one another two propeller 1 and 2, provided with blades. 1 and 2, propeller mounted rigidly on the shaft 5, the blades of the first propeller downwind offset relative to one second propeller blades 2 in the circumferential direction in the direction of rotation windwheels an angle a, defined by the relation
where b max -horda blade propeller to its maximum cross-section,
R-maximum radius of the wind wheel,
and the distance between the propeller 1 and 2 is made integral (0,6.1,8) b max.
The blades of the first propeller 1 are made with wedge angles greater than corresponding angles of the blades jamming second propeller 2 at 2.10 o.
Wind turbine operates as follows. The wind, affecting the blades 3 and 4 windwheels, causing rotation of the shaft 5. As a result of the impact of wind on the blade 3 of the first propeller 1 and behind the rotation of the blade formed disturbed flow zones that acting on the blade 4 of the second propeller, it creates a torque. Regulation 4 of the blade propeller 2 is chosen so that it falls into the area of disturbed flow with increased speed and turbulized from the blades of the first propeller 3 1. In this area, where there is a "shortage" velocity zone of aerodynamic shadow of the first rotor blade is shifted relative to the position of the blades the second propeller (see. FIG. 3), and has no negative effects. The second wind wheel weakly perturbed flows about and partly turbulized flow, which increases the power of developing a second wind wheel.
To increase the power developed by the second wind wheel angles of the cross-sections of blades relative to the rotation selected smaller alignment plane sections of the blade 3 of the first propeller 1, which corresponds to the optimum conditions of flow of the blades of the second propeller 2 stream, which after interaction with the blades of the first propeller gets an extra turn (cf. . 3).
As a result of studies found that for optimum flow conditions of the blades 4 of the second propeller in the range of wind speeds 2,5.25 m / s propeller blades of the first one should be done with wedge angles greater than corresponding angles of the blades jamming second propeller 2 at 2.10 o
In the peripheral areas of propeller blades because of the increased peripheral speed with increasing radius of the blade section changes the magnitude and direction of the vector sum
V = V + V enV (3)
where: V-speed of undisturbed flow, V env = WR;
R-radius of the propeller;
W-angular speed propeller.
Zone 1 Zone "deficit" aerodynamic shadow speed shifts, as shown in FIG. 3, the right against the rotation of the propeller. Zone 11, which is necessary to place the second propeller blades, and moves to the right.
The amount of linear displacement of the second section of the blades of the wind wheel in the tangential direction by increasing the cross-section radius should be increased, which is achieved by specifying a second propeller blades relative to the first turn on the angle determined by the ratio of (I): with the large cross section of radius it gets larger displacement.
The claimed solution increases the operating range of wind speeds, and is intended primarily for use in electric power generation of low-speed air streams 2,5.6,0 m / s, while maintaining at the same time with high efficiency vetropotokah and provides the necessary strength characteristics of storm loading.
The claimed solution has a reduced diameter propeller at equal power, which favorably affects the size of wind turbine design and acting on it loads and reduces the load on the tower.
At wind speeds above calculated to achieve the nominal power for power limit, withdrawn from the flow of the wind wheel blades windwheels both synchronously rotated, maintaining said ratio for wedging the first and second angles windwheels, for example, 5 degrees.
If there is no need to limit the power of wedge angles of sections Novki set of optimal flow conditions, using known methods for this purpose in compliance with the above specified differences in the values of the angles of the cross sections of the first and second windwheels.
Thus, the goal of the invention is achieved.
The use of the claimed device is oriented primarily for continental Central regions of Russia and other countries, where the average annual wind speeds are in the range 3,0.4,6 m / s and at the same time increasing power generation.
CLAIM
1. Wind turbine comprising a horizontal shaft mounted thereon at a distance from one another two propeller provided with blades, characterized in that the propeller shaft is rigidly fixed, while the first blade towards the propeller blades are shifted relative to wind the second propeller in the circumferential direction towards the an angle of rotation windwheels 
where b max chord blade propeller to its maximum cross-section;
R maximum radius of the wind wheel,
and the distance between the propeller is (0,6 - 1,8) b max.
2. Wind turbine according to claim 1, characterized in that the first propeller blades are configured wedge angles greater than corresponding angles of the second propeller blade jamming on Feb. 10 o.
print version
Publication date 02.04.2007gg
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