CN111828243A

CN111828243A - High-rotating-speed wind driven generator blade

Info

Publication number: CN111828243A
Application number: CN202010631049.2A
Authority: CN
Inventors: 薛冻
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2020-10-27

Abstract

The invention discloses a high-rotating-speed wind driven generator blade, which comprises a streamline rotor wing connected with a turbine hub of a generator; at least one accelerating groove used for accelerating the air flow on the windward side of the rotor wing is transversely arranged on the windward side of the rotor wing, the accelerating groove is arranged at one end, close to the air outlet side, of the rotor wing, and the length of the accelerating groove is 1/5-4/5 of the width of the rotor wing at the position of the accelerating groove. The accelerating groove reduces the flow of wind from the tip of the blade handle blade, so that more wind energy can enter the accelerating groove, is sprayed out after accelerating in the accelerating groove, pushes the turbine to rotate, increases the torque acting on the turbine, improves the rotating speed of the turbine, increases the generating capacity, improves the generating efficiency, and can reduce the lowest wind speed of the wind driven generator, namely when the wind speed is lower than the lowest wind speed required by the normal work of the traditional turbine, the wind driven generator additionally provided with the accelerating groove can also normally operate and generate electricity.

Description

High-rotating-speed wind driven generator blade

Technical Field

The invention relates to the field of wind power generation equipment, in particular to a high-rotating-speed wind driven generator blade.

Background

The coordinated development of economy, energy and environment is a necessary condition for achieving the national modernization goal. With the global warming and the continuous consumption of fossil energy and the problem of the influence on the environment, the development of other energy sources is more and more emphasized. In the emerging energy types, wind energy is one of the conversion forms of solar energy, is an inexhaustible clean renewable energy, does not generate any harmful gas and fertilizer, does not pollute the environment, and has huge development potential and broad prospect.

The current wind driven generator adopts a power generation mode that wind power drives a turbine to rotate so as to drive a generator to generate power. The rotor of the turbine blade used at present is a propeller type rotor with a smooth surface, and the cross-sectional area of the rotor is gradually reduced from the center of the turbine to the outside. When wind blows to the windward side, airflow acts on the surface of the rotor wing and is then decomposed into thrust along the axial direction of the generator and thrust along the tangential direction of the rotor wing, and only the part of the tangential thrust can push the turbine to rotate so as to generate electricity. However, because the surface of the rotor wing is smooth, due to the characteristics of the propeller type rotor wing, a part of wind flows from the center of the turbine to the tip direction of the outer side of the rotor wing along the windward side of the rotor wing, and the part of wind captured by the rotor wing cannot push the turbine to rotate and is wasted, so that the working efficiency of the turbine can be influenced. Meanwhile, when the wind speed is lower than the minimum wind speed required by the operation of the traditional wind driven generator, the wind driven generator cannot work normally.

In order to reduce the air quantity flowing from the center of the turbine to the tip direction of the rotor wing along the longitudinal direction of the rotor wing along the windward side of the rotor wing, a transverse through groove can be added on the rotor wing, so that one part of the wind flowing along the longitudinal direction of the rotor wing enters the through groove to push the rotor wing to rotate, the torque applied on the rotor wing is increased, the rotating speed of the wind driven generator is improved, and the efficiency of the wind driven generator is also improved.

There are many factors that affect the speed and efficiency of a wind turbine, such as wind speed, turbine size, wing profile and angle of attack, rotor surface texture, etc.

It is generally believed that, after the acceleration slot is added on the windward side of the rotor, the longer the acceleration slot on the rotor is, the more the air volume enters into the acceleration slot, the greater the pushing force on the turbine is, so that in use, the acceleration slot is set to be a through slot, so that more air enters into the slot. However, in practice, although resistance is added to the wind flowing along the longitudinal direction of the rotor, and a part of the wind enters the grooves to generate thrust to the rotor, the effect is not obvious, the improvement of the rotating speed and the generating efficiency of the wind driven generator with the accelerating grooves is not obvious, the improvement of the rotating speed and the efficiency of the wind driven generator is limited, and the increasing amount of the rotating speed is generally not more than 5%.

Disclosure of Invention

The invention aims to provide a high-rotating-speed wind driven generator blade which is used for improving the rotating speed and the efficiency of a wind driven generator.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a high speed wind turbine blade comprising a streamlined rotor for connection to a generator turbine hub; at least one accelerating groove used for accelerating the air flow on the windward side of the rotor wing is transversely arranged on the windward side of the rotor wing, the accelerating groove is arranged at one end, close to the air outlet side, of the rotor wing, and the length of the accelerating groove is 1/5-4/5 of the width of the rotor wing at the position of the accelerating groove.

Further, the cross-sectional area of the acceleration groove is gradually reduced along the flow direction of the wind.

Further, the rotor is equipped with two at least ailerons rather than fixed connection along its length direction, is the acceleration groove of V-arrangement between the adjacent aileron, the air inlet side width in groove with higher speed, it is narrow to go out the air-out side, the groove sets up more than the windward side of rotor with higher speed.

Further, the length of the acceleration groove is 1/4-1/2 of the width of the rotor.

Further, the acceleration groove is located below the windward side of the rotor.

Furthermore, the cross section of the accelerating groove is rectangular or trapezoidal, and round corner transition is formed between two adjacent surfaces of the accelerating groove.

The invention has the positive effects that:

according to the invention, the accelerating grooves are arranged on the surface of the blade of the traditional wind driven generator, so that the flow of wind along the longitudinal direction of the rotor wing is reduced, more wind energy can enter the accelerating grooves, is sprayed out after being accelerated in the accelerating grooves, and pushes the turbine to rotate, so that the torque acting on the turbine is increased, the rotating speed of the turbine is increased, the generating capacity is increased, the generating efficiency is improved, and the lowest wind speed of the wind driven generator in operation can be reduced, namely when the wind speed is lower than the lowest wind speed required by the normal operation of the traditional turbine, the wind driven generator with the added accelerating grooves can also be normally operated and generate electricity. The invention can also be used for improving the existing wind driven generator blade, and the rotating speed and the working efficiency of the wind driven generator blade are improved. The groove air inlet side the place ahead is the air inlet district with higher speed, and the wind in air inlet district can not flow out from the rotor front end and produce adverse effect to the turbine is rotatory.

Drawings

FIG. 1 is a schematic view of the structure of a turbine according to embodiment 1 of the present invention;

fig. 2 is a schematic structural view of a rotor according to embodiment 1 of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

fig. 4 is a schematic structural view of a rotor according to embodiment 2 of the present invention;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

FIG. 6 is a cross-sectional view taken at the location C-C in FIG. 4;

FIG. 7 is a schematic view of the flow of wind over the rotor when the acceleration slot is a through slot;

in the figure, 1, ailerons; 2. a rotor; 3. an acceleration tank; 4. a hub.

Detailed Description

Through increasing logical groove on the rotor of generator in the wind to promote aerogenerator's rotational speed and efficiency, thereby can send more electric energy. However, the phenomenon of a small wind turbine in actual operation is different from the above-mentioned general knowledge.

This aerogenerator reforms transform through pasting horizontal aileron at the windward side, and every aileron comprises the paster that a plurality of sections pasted on the rotor, forms the acceleration groove of V-arrangement between the aileron, and the groove length equals with rotor width with higher speed. After the wind driven generator operates for several months, the rotating speed of the wind driven generator is suddenly increased during operation, the generated power is increased, but the electric appliances are not changed. After that, some patches on the air inlet side of the acceleration slot on the rotor wing are inherently fallen off due to infirm adhesion.

The analysis shows that the rotor with the through groove as the acceleration groove enables a part of wind to flow out from the front end of the acceleration groove after entering the acceleration groove, so that the wind can not push the turbine to rotate, and even can generate opposite torque to the turbine to block the rotation of the turbine. After the patches fall off, an air inlet area is formed in front of the groove, and most of air in the air inlet area enters the accelerating groove to push the turbine to rotate. The above reasoning was confirmed by subsequent partial removal of the turbine patch of the wind turbine and finite element simulation tests performed by a computer.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example 1

As shown in fig. 1 and 3, the high-speed wind driven generator blade comprises a rotor 2, a plurality of V-shaped ailerons 1 are welded or bonded on the windward side of the rotor 2 along the length direction of the rotor, the ailerons 1 are formed by bending aluminum alloy sections with trapezoidal sections, a transverse acceleration groove 3 is formed between every two adjacent ailerons 1, and the acceleration groove 3 is positioned above the windward side of the rotor 2. The position of the rotor 2 corresponding to the central hub 4 of the wind turbine is a connecting plate 5 connected with the hub 4.

As shown in fig. 2, the direction indicated by the arrow is a direction in which the wind flows on the surface of the rotor 2 after blowing to the rotor 2, and the flow direction is from right to left. The accelerating groove 3 is in a V shape with a large opening at the right end and a small opening at the left end. The acceleration groove 3 has a trapezoidal cross section as shown in fig. 3.

Because the wind driven generator has the function of automatically searching wind, the plane of the turbine of the wind driven generator is always vertical to the incoming wind direction, the windward side of the rotor wing 2 is always unchanged, and the flowing direction of the wind in the acceleration groove 3 cannot be changed.

As shown in fig. 2, the position of the rotor 2 at the right of the acceleration slot 3 is an air intake area. When wind blows to the windward side of the rotor wing 2 along the central axis of the hub 4, the wind in the wind inlet area is accelerated under the action of the acceleration groove 3 and then is accelerated and sprayed out from the left end of the acceleration groove 3, so that the rotor wing 2 is pushed to rotate along the center of the hub 4. The aileron 1 arranged on the rotor 2 can also generate resistance to the wind flowing from the connecting plate 5 to the tip of the rotor 2, thereby reducing the flow of the wind in the direction and enabling more wind to enter the accelerating groove 3, thereby improving the rotating speed and the working efficiency of the turbine.

The acceleration slot 3 is arranged at the left part of the rotor 2, and the length of the acceleration slot 3 is 1/5-4/5 of the width of the rotor 2 at the position of the acceleration slot 3.

The following is the influence of the rotor 2 on the rotating speed of the turbine after the acceleration slots 2 with different lengths are arranged, the test method is a rotating speed test of a computer simulation turbine in a wind tunnel, a table I is the test condition, a table II is the test result, L in the table II is the length of the acceleration slot 3, and B is the width of the rotor 2 at the position of the acceleration slot 3.

Watch 1

Watch two

From the data in table two, the following conclusions can be drawn:

when the length of the acceleration groove 3 is greater than or equal to 1/5 of the width of the rotor wing 2, the rotating speed of the turbine is higher than that of the turbine without the deceleration groove; when the length of the accelerating slot 3 is 1/2-1/4 of the width of the rotor 2, the rotating speed of the turbine is obviously increased, and the rotating speed is increased by more than 7%; when the length of the accelerating slot 3 is 1/3 of the width of the rotor wing 2, the turbine speed reaches 17.1rad/s, which is 12.5 percent higher than the turbine speed of the traditional blade, and the effect is most obvious. Therefore, the turbine speed variation law does not increase with the increase of the length of the acceleration slot 3, but increases to a certain extent with the increase of the length of the acceleration slot 3 and then decreases with the increase of the length of the acceleration slot 3.

As shown in fig. 7, the arrow indicates the direction of the flow of the wind. Accelerating groove 3 and rotor 3's front and back both ends all communicate with each other for some wind flows out from accelerating groove 3's front end after getting into accelerating groove 3, thereby can not promote the turbine and rotate, can produce opposite torque to the turbine even, hinders the rotation of turbine, and this is that accelerating groove 3 promotes unobvious reason for turbine speed when leading to the groove.

After the accelerating groove 3 is added to the turbine of the wind driven generator, the flow of wind from the connecting plate 5 to the tip of the rotor 2 is reduced, more wind energy can enter the accelerating groove 3 and is sprayed out after accelerating in the accelerating groove 3, and the turbine is pushed to rotate, so that the torque acting on the turbine is increased, the rotating speed of the turbine is improved, the generating capacity is increased, the generating efficiency is improved, and the lowest wind speed of the wind driven generator in operation can be reduced, namely when the wind speed is lower than the lowest wind speed required by the normal operation of the traditional turbine, the wind driven generator with the accelerating groove 3 can also be normally operated and generate electricity.

Example 2

As shown in fig. 4 and 5, the present embodiment is different from embodiment 1 in that an acceleration slot 3 is provided below the windward side of the rotor 2.

The V-shaped acceleration groove 3 is formed by processing the rotor wing 2, the cross section of the acceleration groove 3 is rectangular, and the two adjacent surfaces of the acceleration groove 3 are in smooth transition, so that the rotor wing 2 can be prevented from being broken due to stress concentration at the acceleration groove 3. As shown in fig. 6, the bottom of the acceleration slot 3 and the air inlet surface of the rotor 2 are in transition through an inclined plane, so that the influence of local turbulence on the efficiency of the wind driven generator is avoided.

As shown in fig. 4, the position of the rotor 2 at the right of the acceleration slot 3 is an air intake area. When wind blows towards the windward side of the rotor 2 along the central axis of the hub 4, the wind flows from the air inlet area to the acceleration groove 3 leftwards along the direction indicated by the arrow, and then is accelerated by the acceleration groove 3 and then is sprayed out from the left end of the acceleration groove 3 along the acceleration groove 3, so that the rotor 2 is pushed to rotate along the center of the hub 4. Meanwhile, the accelerating grooves 3 can also generate resistance to wind flowing from the connecting plate 5 to the tips of the rotor wings 2, the flow of the wind in the direction is reduced, more wind can enter the accelerating grooves 3, and the turbine is pushed to rotate, so that the rotating speed and the working efficiency of the turbine are improved.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; it is obvious as a person skilled in the art to combine several aspects of the invention. And such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A high speed wind turbine blade, characterized in that it comprises a streamlined rotor (2) for connection to a generator turbine hub (4); transversely be equipped with at least one on the windward side of rotor (2) and be used for accelerating acceleration groove (3) of rotor (2) windward side air flow, acceleration groove (3) set up in rotor (2) and are close to the one end of air-out side, the length of accelerating groove (3) is 1/5 to 4/5 of rotor (2) width of its position.

2. A high rotational speed wind turbine blade according to claim 1, wherein the cross-sectional area of the acceleration groove (3) is gradually decreasing in the direction of the flow of the wind.

3. A high speed wind turbine blade according to claim 1, wherein the rotor (2) has at least two flaps (5) fixedly connected to the rotor along the length direction thereof, and a V-shaped acceleration slot (3) is formed between adjacent flaps (5), the acceleration slot (3) has a wide air inlet side and a narrow air outlet side, and the acceleration slot (3) is disposed above the windward side of the rotor (2).

4. A high speed wind turbine blade according to claim 1, wherein the length of the acceleration slot (3) is 1/4 to 1/2 of the width of the rotor (2).

5. A high speed wind turbine blade according to claim 1, wherein the acceleration slot (3) is located below the windward side of the rotor (2).

6. A high rotational speed wind turbine blade according to claim 1, wherein the cross section of the acceleration groove (3) is rectangular or trapezoidal, and the two adjacent surfaces of the acceleration groove (3) are rounded.