Flow guide and wind gathering type wind turbine

Abstract

The invention overcomes the defects in the prior art, provides a flow guide wind gathering type wind turbine, and greatly improves the efficiency of wind power generation. In order to solve the technical problem, according to the technical scheme, the flow guide and wind gathering type wind turbine comprises a wind turbine body, a blade of the wind turbine body comprises a blade root part and a windward chord part, the blade root part and the windward chord part are integrally formed, the blade root part is used for being connected with a hub of the wind turbine body, and the blade root part is used for being connected with the hub of the wind turbine body. The windward chord part is used for catching wind, the chord length of the windward chord part is gradually reduced from the starting position to the blade tip part, a conical flow guide device is arranged on one side of the windward side of the wind turbine body, the small end of the conical flow guide device is arranged towards the windward side, and the projection of the large end of the conical flow guide device completely covers the blade root part; the invention can be widely applied to the field of wind turbines.

Description

Technical Field

[0001] The invention relates to a flow-guiding and wind-focusing wind turbine, belonging to the technical field of wind turbines. Background Art

[0002] As an environmentally friendly and renewable energy source, wind energy has played an increasingly important role in my country's energy system in recent years. However, there is a common industry pain point in the field of wind power generation, that is, the problem of wind resource waste near the center of the hub. The root cause of this problem is the low efficiency of wind energy utilization, especially the insufficient wind energy conversion efficiency at the root of the blade, which directly affects the overall power generation capacity.

[0003] Therefore, it is particularly important to optimize the design of wind turbines in terms of energy transfer and recovery, which not only helps to improve the efficiency of wind power generation, but also has far-reaching significance for promoting the sustainable development of the wind energy industry. Summary of the invention

[0004] The present invention overcomes the deficiencies of the prior art, provides a wind-guiding and wind-focusing wind turbine, and greatly improves the efficiency of wind power generation.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a diversion and wind-focusing wind turbine, including a wind turbine body, the blades of the wind turbine body include a blade root part and a wind chord part, the blade root part and the wind chord part are integrally formed, the blade root part is used to be connected to the hub of the wind turbine body, the wind chord part is used to catch wind, and the chord length of the wind chord part gradually decreases from the starting position to the tip of the blade, and a conical flow guide device is provided on one side of the windward surface of the wind turbine body, the small end of the conical flow guide device is arranged toward the windward surface, and the large end of the conical flow guide device is projected to completely cover the blade root part.

[0006] Preferably, the conical flow guide device is arranged on either one side of the casing of the wind turbine body, or on a side of the blades of the wind turbine body away from the casing.

[0007] Preferably, the central axis of the conical flow guide device coincides with the central axis of rotation of the blades of the wind turbine body.

[0008] Preferably, the conical flow guide device is either an integrated conical shell or a conical skeleton-coated shell.

[0009] Preferably, the small end angle of the conical flow guide device is 10° to 150°.

[0010] Compared with the prior art, the present invention has the following beneficial effects: the present invention uses a conical guide device to guide and deflect the wind flowing through the surface of the conical guide device, transfers it to the wind receiving chord part for working, and superimposes it with the wind originally directly blowing on the wind receiving chord part, thereby increasing the working wind speed of the wind receiving chord part and greatly improving the efficiency of wind power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below in conjunction with the accompanying drawings.

[0012] Figure 1 It is a schematic diagram of the structure of the upwind direction in the present invention.

[0013] Figure 2 It is a schematic diagram of the structure of the downwind direction in the present invention.

[0014] Figure 3 It is a cloud diagram showing the relationship between taper and superimposed wind speed in the present invention.

[0015] Figure 4 This is a schematic cloud diagram of the superimposed wind speed simulation when the taper is 60° in the present invention.

[0016] Figure 5 This is a schematic cloud diagram of the superimposed wind speed simulation when the taper is 90° in the present invention.

[0017] In the figure: 1 is the wind turbine body, 2 is the blade root part, 3 is the wind chord part, 4 is the conical guide device, and 5 is the casing. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with specific embodiments.

[0019] Embodiment 1, as Figure 1 to Figure 5 As shown, the present invention discloses a wind-guiding and wind-focusing wind turbine, comprising a wind turbine body 1, wherein the blades of the wind turbine body 1 comprise a blade root portion 2 and a wind-receiving chord portion 3, wherein the blade root portion 2 and the wind-receiving chord portion 3 are integrally formed, wherein the blade root portion 2 is used to be connected to the hub of the wind turbine body 1, wherein the wind-receiving chord portion 3 is used to catch wind, and wherein the chord length of the wind-receiving chord portion 3 gradually decreases from the starting position to the blade tip, wherein a conical flow-guiding device 4 is arranged on one side of the windward surface of the wind turbine body 1, wherein the small end of the conical flow-guiding device 4 is arranged toward the windward surface, wherein the conical flow-guiding device 4 is arranged to be oriented to the windward surface, wherein the conical flow-guiding device 4 is provided ... The large end projection of the conical flow guide device 2 completely covers the blade root part 2; the conical flow guide device 4 is located on one side of the chassis 5 of the wind turbine body 1, and the conical flow guide device 4 is fixedly arranged on the chassis 5. The blades of the wind turbine body 1 are adjusted to the windward side by pitch adjustment. The central axis of the conical flow guide device 2 coincides with the central axis of rotation of the blades of the wind turbine body 1. The conical flow guide device 2 is either an integrated conical shell or a conical skeleton coated shell. The small end angle of the conical flow guide device 2 is 90°, and the conical flow guide device 2 is an arc-shaped cone.

[0020] Embodiment 2: In this embodiment, the conical flow guide device 2 is located on the side of the blade of the wind turbine body 1 away from the chassis 5, and the conical flow guide device 2 is fixed at the rotation center of the blade and can rotate synchronously with the blade. The remaining features are the same as those of embodiment 1.

[0021] The above-mentioned Example 1 and Example 2 are for 19.8-meter-long wing-shaped blades. In the traditional design, due to the connection between the blade root and the hub, the wind energy utilization coefficient is not designed at the optimal position. Ideally, the chord length of the blade should gradually increase from the tip to the root. However, in order to meet the structural strength requirements, the chord length is forced to decrease, resulting in a significant decrease in the wind energy utilization rate in the blade root area. The optimal wind energy utilization coefficient is located at a distance of 4500mm from the blade root. This embodiment implements drainage measures at a distance of about 5000mm from the blade root to optimize airflow guidance and improve wind energy utilization efficiency.

[0022] The specific scheme of this embodiment is as follows: 1. Overview of cone guide device design: A conical guide device with a diameter of 5 meters is installed on the windward side of the wind turbine blades.

[0023] The purpose of this conical guide device is to accurately guide the airflow to the best working area of ​​the blade and optimize the air flow path; Schematic diagram of fluid flowing through a conical barrel, where is the incoming wind speed. In the process of flow, affected by the conical barrel, the speed will tilt to both sides. Assuming that the axial speed is , according to the law of conservation of mass: ; After calculation, we get: ; Where D is the diameter of the wind turbine, d is the diameter of the central cone barrel, V1 is the incoming wind speed, V 2z is the axial speed when passing through the tapered barrel.

[0024] As the angle increases, the maximum speed gradually increases and the affected area gradually increases.

[0025] 2. Performance improvement: The guide device significantly increases the wind speed within the effective swept area of ​​the blade.

[0026] This enables more efficient use of the wind energy in the central area of ​​78.5 square meters, increases the swept area by 6%, and improves the efficiency of wind energy utilization.

[0027] 3. Actual test results: Actual wind speed tests show that within a specific impact area, the wind-gathering effect increases the wind speed by about 2.5 times.

[0028] This shows that the diversion or wind-focusing design can effectively enhance the wind speed on the windward side of the blade and improve the efficiency of wind energy capture and conversion.

[0029] The formula of airflow kinetic energy: Where E is the kinetic energy of the airflow, ρ is the air density, A is the cross-sectional area of ​​the airflow, and v is the wind speed.

[0030] 4. Wind energy boost calculation: The wind speed increased to 2.5 times the original value, and the wind energy increased to 15.625 times the original value.

[0031] 5. Other advantages: The guide device can also enhance the utilization of wind energy in the central area of ​​the blade.

[0032] Effectively reduce the impact of tower shadow effect on downstream wind turbines and improve overall performance.

[0033] In summary, the design and application of this conical guide device has a significant effect on improving the efficiency and performance of wind turbines, and helps promote the development and application of wind energy technology.

[0034] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A wind-guiding and concentrating wind turbine, comprising a wind turbine body (1), wherein a blade of the wind turbine body (1) comprises a blade root portion (2) and a wind receiving chord portion (3), wherein the blade root portion (2) and the wind receiving chord portion (3) are integrally formed, wherein the blade root portion (2) is used to be connected to a hub of the wind turbine body (1), wherein the wind receiving chord portion (3) is used to catch wind, and wherein the chord length of the wind receiving chord portion (3) gradually decreases from a starting position to a blade tip, wherein: A conical flow guide device (4) is provided on one side of the windward surface of the wind turbine body (1), the small end of the conical flow guide device (4) is arranged toward the windward surface, and the large end of the conical flow guide device (2) projects completely onto the blade root portion (2).

2. A wind-guiding and wind-concentrating wind turbine according to claim 1, characterized in that: The conical flow guide device (4) is arranged on one side of the casing (5) of the wind turbine body (1), or on the side of the blades of the wind turbine body (1) away from the casing (5).

3. A wind-guiding and wind-concentrating wind turbine according to claim 1, characterized in that: The central axis of the conical flow guide device (2) coincides with the central axis of rotation of the blades of the wind turbine body (1).

4. The wind-guiding and concentrating wind turbine according to claim 1, characterized in that: The conical flow guide device (2) is either an integrated conical shell or a conical skeleton-coated shell.

5. The wind-guiding and concentrating wind turbine according to claim 1, characterized in that: The small end included angle of the conical flow guide device (2) is 10° to 150°.

6. The wind-guiding and wind-concentrating wind turbine according to claim 1, characterized in that: The conical flow guide device (2) is an arc-shaped cone.

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