CN101699062B - A guide vane type lift type vertical axis wind wheel - Google Patents

Abstract

The invention discloses a guide vane type lifting vertical shaft wind wheel, comprising a wind wheel shaft and two or more than two lifting vanes which are arranged on the wind wheel shaft; a bracket which can rotate around the wind wheel shaft is also arranged on the wind wheel shaft, the bracket is a straight line bracket which can penetrate through the axis of the wind wheel shaft, two guide vanes and a tail vane which causes the guide vanes to be stillstand relatively are arranged on the bracket, the two guide vanes are fixed at two ends of the bracket and the directions of the guide ends of two guide vanes are the same, and the plane of the center of the tail vane is vertical to the bracket. Compared wit the prior art, two guide vanes and two or more than two lifting vanes are arranged on the wind wheel shaft at the same time, and by utilizing the two guide vanes to guide direction, the wind energy utilization rate can be improved by 2 percent compared by the existing lifting vertical shaft wind wheel.

Description

A guide vane type lift type vertical axis wind wheel

technical field

The invention relates to the technology and equipment of a vane type lift type vertical axis wind wheel.

Background technique

At present, the wind collectors of most wind turbines are horizontal axis wind rotors. The horizontal axis wind rotor adopts lift-type blades, which has a faster speed, a higher utilization rate of wind energy, and a relatively mature technology, so it is widely used. However, the generator of the horizontal axis wind turbine needs to be placed at a high altitude, the noise is relatively high, and the power also suffers from yaw loss. These are the problems that the horizontal axis wind turbine cannot solve.

Compared with the horizontal-axis wind rotor, the lift-type vertical-axis wind rotor has a slower speed and lower noise; the generator can be placed on the ground for easy maintenance; there is no need to face the wind, and there is no yaw power loss. However, the wind energy conversion rate of the lift-type vertical axis wind turbine is slightly lower than that of the horizontal axis, so the development is slow and the application rate is low.

From the aerodynamic analysis of the lift-type vertical axis wind rotor blades, it can be seen that within the range of 360° rotation angle, the dynamic moments of the blades at the two positions of 270° and 90° are negative, and the dynamic moments of the nearby areas are also negative. It is lower, which indicates that the blade is in a braking state when moving to these two positions. This has just become an important reason for the low wind energy utilization coefficient of the lift type wind rotor.

Contents of the invention

The technical problem to be solved by the present invention is to provide a straight blade lift type vertical axis wind rotor with guide vane blades in order to improve the wind energy utilization rate of the lift type wind rotor.

In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a guide vane-type straight blade lift-type wind rotor, comprising a wind rotor shaft and two or more lift-type blades arranged on the wind rotor shaft. A support that can rotate around the wind wheel shaft is also provided on the described wind wheel shaft, and the described support is a linear support passing through the axis of the wind wheel shaft. Two guide vanes are arranged on the described support and the guide vanes In the relatively stationary tail rudder, the two guide vanes are fixed at both ends of the bracket, and the guide ends of the two guide vanes face each other, and the plane where the center of the tail rudder is located is perpendicular to the bracket.

The extension line of the trailing edge on the upper surface of the guide end of the guide vane is perpendicular to the rudder arm, and the extension line of the trailing edge on the upper surface of the guide end of the guide vane is parallel to the bracket.

Described tail rudder is one, and the middle part of support is set.

There are two tail rudders, which are arranged symmetrically on both sides of the center of the bracket.

The density σ of the lift-type blade is 0.13-0.5, σ=2NC/D, where C is the chord length of the blade, N is the number of blades, and D is the rotation diameter of the lift-type blade.

The length L of the rudder arm is greater than the rotation diameter D of the wind rotor, and the area A of the rudder satisfies A>ht, where h is the height of the guide vane blade, and t is the chord length of the guide vane.

Compared with the prior art, the beneficial effects of the guide vane type lift type vertical axis wind wheel of the present invention are:

1. Install 2 guide vanes and 2 or more lift-type blades on the wind rotor shaft at the same time, and use the two guide vane blades to guide the wind direction, so that the utilization rate of wind energy can be higher than that of the existing lift-type vertical axis wind rotors 2%.

2. The angle of attack is the angle between the relative velocity vector and the chord line of the blade. The larger the angle of attack within a certain range, the greater the dynamic moment of the wind rotor. The two guide blades are respectively located at the two positions with the smallest angle of attack of the lift blades, and the angle of attack of the blades at this position is increased by changing the wind direction, so that the overall dynamic moment of the wind wheel is relatively unguided under the condition that the speed does not change. The lift type vertical axis wind rotor of the blade is increased to some extent.

3. Lift-type blades are driven to rotate by aerodynamic lift. The guide blade adjusts the spatial position according to the wind direction through the torque transmitted by the tail rudder, so that the guide blade is always in the 90° and 270° positions of the lift-type blade rotation space, which completely eliminates the original lift-type vertical axis wind rotor blade. Negative moment phenomena at 90° and 270° downwind.

4. The guide blades can capture more wind, and by changing the wind direction, make it perpendicular or nearly perpendicular to the direction of motion of the lift-type blades, so that the dynamic moment of the lift-type blades in the vicinity increases from the lowest value to the highest value.

Description of drawings

Fig. 1 is a schematic diagram of a vane-type vertical-axis wind rotor with two lift blades according to the present invention.

Fig. 2 is a top view schematic diagram of the guide vane type vertical axis wind wheel with three lift blades of the present invention

Fig. 3 is a schematic diagram of the structure of the guide vane blade of the present invention.

Figure 4 is a schematic diagram of the force on the blade at 90° when there is no guide vane

Fig. 5 is a schematic diagram of the power angle of the guide vane blade acting on the lift blade according to the present invention.

Among them: 1 wind rotor shaft; 2 lift-type blades; 3 guide blades; 4 tail rudder; 5 rudder arms; 6 bearings; 7 beams; 8 brackets; 9 blade chords.

Detailed ways

1, below in conjunction with accompanying drawing, the present invention is described in detail. As shown in FIG. 1 , the vane-type lift-type wind rotor of the present invention includes a wind rotor shaft 1 on which two or more lift-type blades 2 and two guide vane blades 3 are installed. Guide vane 3, tail rudder 4, rudder arm 5 and support 8 form a rotatable motion mechanism, and its rotation is driven by tail rudder 4. After the wind direction changes, the tail rudder 4 can be a flat plate or a symmetrical structure at both ends. The tail rudder 4 is affected by the resistance of the wind direction, so that its span direction is always consistent with the wind direction, so that the two guide vanes 3 are always in a relatively static state. . The lift blade 2, the bracket 6 and the wind wheel shaft 1 form another rotating mechanism, and the lift blade 2 is powered by aerodynamic lift to rotate. The two rotating mechanisms are transitionally connected by two bearings 7, so that the movement between the two does not interfere with each other.

2. As shown in Figure 2, the span direction of the tail rudder 4 is perpendicular to the line connecting the guide vanes 3. Under the action of the tail rudder 4, it can ensure that the two guide vanes 3 are always at the 90° and 270° positions of the wind wheel. As shown in Figure 3, after being guided by the guide vanes 3, the wind direction changes by 90°.

3. When the wind direction in front of the wind wheel changes, the lift type blade 2 is not limited by the wind direction and continues to rotate. The wind produces resistance to the tail rudder 4, and the torque is transmitted through the rudder arm 8, thereby driving the movement of the two guide vanes 3, and adjusting the positions in time so that they are always at the positions of 90° and 270° respectively.

4. As shown in Figure 4, in the velocity vector triangle, when there is no guide vane 3, when the wind direction is in the same line as the tangential velocity direction of the wind wheel, the angle of attack is 0°. At this time, the wind wheel moves in the opposite direction, the lift force is 0, and the resultant force is Resistance R. As shown in FIG. 5 , after the guide vane 3 is installed, the wind acts on the lift type blade 2 at a position of 90° after being guided by the guide vane 3 . According to the principle of velocity vector triangle, the relative velocity vector W formed by superimposing the wind velocity vector U perpendicular to the wind direction of the chord length of the blade and the linear velocity vector V of the wind wheel parallel to the wind direction of the chord length forms a non-0° attack with the blade chord 9 Angle, changed the lift type blade 2 in 90 ° and 270 ° position 0 ° attack angle of the original state. When the angle of attack is α, the lift force generated is S, the resistance is R, and the dynamic moment increases. Similar to the force exerted at the 90° position, the same effect will be produced at the 270° position.

The present invention is a guide vane type lift type vertical axis wind wheel, which is composed of a lift type blade 2 and a guide vane 3, wherein the guide vane 3 is continuously adjusted in position under the action of the tail rudder 4, and is kept at 90° and 90° in the rotation space of the wind wheel The relative position of 270° does not change. The guide vane 3 changes the wind direction of the lift blade 2 near 90° and 270°, increases the aerodynamic angle of attack of the blade, increases the dynamic moment, and achieves the effect of improving the wind energy conversion rate of the wind rotor.

Claims (5)

1. guide vane type lifting vertical shaft wind wheel; Comprise rotor shaft (1) and be arranged on 2 or 2 above lift-type blades (2) on the said rotor shaft (1); It is characterized in that: on described rotor shaft (1), also being provided with one can be around the support (8) of rotor shaft (1) rotation; Described support is the straight line support that passes rotor shaft (1) axle center, 2 guide vanes (3) is set on described support (8) and makes said guide vane (3) be in the tail vane static with respect to wind direction (4), and described two guide vanes (3) are fixed on the two ends of said support (8); One end of described guide vane (3) is a guide end; The other end of guide vane is a wind inlet end, and the guide end direction of two guide vanes (3) in opposite directions, and plane, place, described tail vane (4) center is vertical with described support (8); The wind inlet end upper surface trailing edge elongation line of described guide vane (3) is vertical with described support (8), and the guide end upper surface trailing edge elongation line of described guide vane (3) is parallel with described support (8).

2. guide vane type lifting vertical shaft wind wheel according to claim 1 is characterized in that: described tail vane (4) is one, is arranged on the middle part of support (8).

3. guide vane type lifting vertical shaft wind wheel according to claim 1 is characterized in that: described tail vane (4) is two, is symmetricly set on the both sides at support (8) center.

4. guide vane type lifting vertical shaft wind wheel according to claim 1 is characterized in that: described lift-type blade (2) degree of compaction σ is 0.13～0.5, σ=2NC/D, and wherein C is the blade chord length, and N is the number of blade, and D is a lift-type blade rotating diameter.

5. guide vane type lifting vertical shaft wind wheel according to claim 2 is characterized in that: described tail vane (4) brachium L is greater than wind wheel rotating diameter D, and described tail vane (4) area A satisfies, A＞ht, and h is the guide vane height here, t is the guide vane chord length.

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