A vertical axis wind turbine blade with a booster T-band

Abstract

The application relates to a vertical axis fan blade with a synergistic T-shaped band, which comprises a blade body and a T-shaped band arranged on the outer surface of the blade body; the overall trend of the T-shaped band extends along the chord length direction of the blade body and is located within the front two-thirds range of the leading edge to the trailing edge of the blade body. The fan blade of the application can obtain a larger range of wake flow, capture more kinetic energy, and greatly improve the aerodynamic performance of the fan.

Description

Technical Field

[0001] This invention relates to the technical field of wind turbine blades, and more particularly to a vertical axis wind turbine blade with an efficiency-enhancing T-shaped belt. Background Technology

[0002] Optimization of wind turbine aerodynamic performance has attracted the attention of governments and scholars worldwide. Optimization methods generally include airfoil optimization, the use of guide structures, and configuration optimization. Airfoil optimization mainly involves selecting airfoils with superior performance by changing the airfoil chord length and thickness of the blades, thereby improving the aerodynamic performance of the wind turbine. Guide structure research mainly involves installing guide structures of specific shapes on the blades to change the direction and speed of the incoming wind, thus improving the aerodynamic performance of the wind turbine. Configuration optimization mainly involves changing traditional wind turbine configurations, such as adopting dual-rotor wind turbine configurations and tree-shaped wind turbine configurations.

[0003] The current technology has the following shortcomings: (1) Although the optimization method improves efficiency to some extent, there are certain problems with economic efficiency and timeliness. It is reflected in the need to spend a lot of time and money to add efficiency-enhancing structures or produce more complex wind turbine configurations. (2) The current optimization method does not improve performance significantly and there is still a large room for optimization. Summary of the Invention

[0004] Therefore, there is a need to provide a vertical axis fan blade with an enhanced T-belt to solve the problem of low practical performance of existing vertical axis fan blades with enhanced T-belts.

[0005] To achieve the above objectives, this application provides a vertical axis fan blade with an efficiency-enhancing T-belt, comprising:

[0006] Blade body;

[0007] A T-shaped band is provided on the outer surface of the blade body. The T-shaped band extends along the extension direction of the blade body and is located within the first two-thirds of the range from the leading edge to the trailing edge of the blade body.

[0008] Furthermore, the T-shaped strip is straight.

[0009] Furthermore, the end face of the T-shaped strip away from the blade body is a plane.

[0010] Furthermore, the T-shaped strip is parallel to the guide edge or follow edge of the blade body.

[0011] Furthermore, the T-shaped strip is located at a quarter position from the guide edge to the trailing edge of the blade body.

[0012] Furthermore, the T-belt is made of rubber or metal.

[0013] Furthermore, the two ends of the T-shaped strip extend to the ends of the blade body, respectively.

[0014] Furthermore, the width value L´ of the T-shaped strip is 0.01 to 0.2 times the chord length L of the blade body, and the height value H´ of the T-shaped strip is 0.01 to 0.2 times the maximum airfoil thickness H of the blade body.

[0015] Unlike existing technologies, the above technical solution has the following advantages: The wind turbine blades of this application have T-shaped strips on the blade body, which can obtain a larger range of wake and capture more kinetic energy, thus greatly improving the aerodynamic performance of the wind turbine. Attached Figure Description

[0016] Figure 1 This is a top view of a vertical axis fan blade with an efficiency-enhancing T-shaped strip after installation, according to this embodiment.

[0017] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 This is a perspective view of a vertical axis fan blade with an efficiency-enhancing T-shaped strip according to this embodiment;

[0019] Figure 4 This is a schematic diagram of the airflow direction of a vertical axis fan blade with an efficiency-enhancing T-shaped strip in this embodiment;

[0020] Figure 5 This is a schematic diagram showing the T-shaped belt positioned within two-thirds of the area in this embodiment;

[0021] Figure 6 This is a schematic diagram showing the T-shaped belt positioned at the quarter position in this embodiment;

[0022] Figure 7 This embodiment describes a C-shaped vertical axis fan blade with an efficiency-enhancing T-shaped belt. P -TSR relationship curve;

[0023] Figure 8 This is a schematic diagram showing the dimensional proportions of the T-shaped belt and the blade body in this embodiment.

[0024] Explanation of reference numerals in the attached figures:

[0025] X, the direction of blade extension;

[0026] Y, the chord direction of the blade body;

[0027] R, direction of rotation;

[0028] V, Incoming flow velocity;

[0029] 1. Blade body;

[0030] 12. The outer surface of the blade body;

[0031] 2. T-type belt. Detailed Implementation

[0032] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0033] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0034] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0035] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0036] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0037] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0038] As understood in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0039] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0040] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; it can be a direct connection or an indirect connection through an intermediate medium; it can be a relationship of two components combined together, an interaction relationship between two components, or a connection within two structures. Those skilled in the art to which this application pertains can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0041] Please see Figure 1-3 This embodiment of a vertical axis fan blade with an efficiency-enhancing T-shaped strip includes:

[0042] Blade body;

[0043] A T-shaped band is provided on the outer surface of the blade body. The T-shaped band extends along the extension direction of the blade body and is located within the first two-thirds of the range from the leading edge to the trailing edge of the blade body.

[0044] In this application, the blade body can be selected from NACA type airfoil or other wind turbine blade airfoil.

[0045] The outer surface of the blade body refers to the outward-facing surface of the blade body after it is installed on a vertical axis fan, i.e., the surface furthest from the rotation axis. For example... Figure 5 As shown, the first two-thirds of the range from the guide edge to the trailing edge of the blade body refers to the outer surface area of ​​the blade body within the two equal divisions closest to the guide edge (i.e., the outer surface of the blade body corresponding to the area selected by the dashed line in the figure).

[0046] In this application, the blade body can be made of aluminum alloy, composite material, or other feasible materials. This application allows for a consistent width across the T-strip.

[0047] This application allows for direct modification of the existing NACA0018 airfoil structure, and the T-shaped strip can be directly attached to the outer surface of the blade body using industrial adhesive or hot-melt method.

[0048] It should be noted that the blade body's span direction X refers to the direction along the length of the blade body, while the blade body's chord direction Y refers to the direction perpendicular to the length of the blade body.

[0049] like Figure 4 As shown in the figure, the solid line represents the vortex direction of blade body 1 after rotation when a T-shaped strip is installed on the outer surface of the blade body, while the dashed line represents the vortex direction of blade body 1 after rotation without a T-shaped strip. It is clear from this figure that installing a T-shaped strip on the blade body can generate a larger wake, capture more kinetic energy, and greatly improve the aerodynamic performance of the wind turbine.

[0050] like Figure 3 As shown, in some embodiments, the T-strip is straight. That is, the T-strip is a protruding structure that is straight and set on the outer surface of the blade body. The protrusions of the T-strip are uniform in height and continuous throughout. When the blade body is straight, the overall direction of the T-strip is its length extension direction.

[0051] In some embodiments, the end face of the T-belt away from the blade body is a plane. Specifically, after the blade body is installed, the end face of the T-belt away from the blade body is a plane parallel to the axis of rotation.

[0052] like Figure 3 As shown, in some embodiments, the T-shaped strip is parallel to the leading edge or trailing edge of the blade body. That is, the T-shaped strip is parallel to the span direction X or the chord direction Y of the blade body.

[0053] In some embodiments, the T-shaped strip is located at a quarter-length from the leading edge to the trailing edge of the blade body. For example... Figure 6 As shown, the quarter-point from the guide edge to the trailing edge of the blade body refers to the position on the outer surface of the blade body corresponding to the first division closest to the guide edge, where the total length C of the line connecting the guide edge and the trailing edge is divided into four equal parts on any cross-section of the blade body (i.e., the position of the T-shaped strip in the figure). Specifically, the center line of the T-shaped strip is located at this quarter-point.

[0054] As shown in Table 1, the table presents the wind energy utilization coefficient (CP) and tip speed ratio (TSR) data under the same experimental conditions when a T-strip is installed at one-third of the distance from the guide edge on the outer surface of the blade body, two-thirds of the distance from the guide edge on the outer surface of the blade body, one-quarter of the distance from the guide edge on the outer surface of the blade body, and no T-strip is installed (bare air).

[0055] Table 1 - C when T-stripes are installed at different positions on the outer surface of the blade body and when no T-stripes are installed P -TSR Relationship Table

[0056]

[0057] Based on Table 1, plot the relationship between the wind energy utilization coefficient (CP) and the tip speed ratio (TSR) when a T-strip is installed on the outer surface of the blade body and when no T-strip is installed. Figure 7 As shown, it is evident that the CP-TSR curves of the blades with T-strips at one-quarter of the distance from the guide edge on the outer surface of the blade body are all above the curves of the blades without T-strips. This demonstrates that the wind turbine blades with T-strips at one-quarter of the distance from the guide edge on the outer surface of the blade body in this application can achieve a higher wind energy utilization coefficient. The CP-TSR curves of the blades with T-strips at one-third and two-thirds of the distance from the guide edge on the outer surface of the blade body are generally above the curves of the blades without T-strips.

[0058] In some embodiments, the T-band is made of rubber or metal. Rubber or metal T-bands are easier to secure to the blade body, have lower manufacturing costs, and are easier to promote and apply. Furthermore, rubber or metal T-bands have higher strength and corrosion resistance, which helps extend the service life of the structure.

[0059] In some embodiments, the two ends of the T-belt extend to the ends of the blade body. This increases the effect of the T-belt, obtains the maximum effective area, and maximizes its effect on the incoming airflow.

[0060] like Figure 8 As shown, in some embodiments, the width value L´ of the T-shaped strip is 0.01 to 0.2 times the chord length L of the blade body, and the height value H´ of the T-shaped strip is 0.01 to 0.2 times the maximum airfoil thickness H of the blade body.

[0061] This application also provides a method for determining the position of the T-belt, including the following steps:

[0062] 1) Set up the experimental platform;

[0063] A wind turbine experimental platform was constructed, and appropriate measurement methods and instruments were selected. The main components of the experimental platform include: a fan providing wind power, a structural frame supporting the wind turbine, and a motor driving the turbine's rotation. The main measuring instruments include: a sensor to measure the turbine's torque and an anemometer to measure wind speed. The measurement method primarily utilizes the wind turbine's wind energy utilization coefficient Cp, measuring the torque and wind speed during the experiment and recording the data.

[0064] Where Cp:

[0065] ;

[0066] Where: T—fan torque, ω—blade angular velocity, ρ —Air density, V—Incoming flow velocity, AS—Fan swept area.

[0067] 2) Measure the performance curve of the bare machine;

[0068] The wind energy utilization coefficient under different tip speed ratios was measured using the constructed experimental platform, and performance curves were plotted. The tip speed ratio (TSR) refers to the ratio of the speed at which the tip of the wind turbine blade moves to the wind speed.

[0069] ;

[0070] In the formula: ω — Blade angular velocity, V — Incoming flow velocity, R — Rotation radius of the wind turbine.

[0071] 3) Install the T-belt in an initial position and measure the performance curve;

[0072] Install the T-belt at a certain distance from the guide edge of the fan and measure the performance curve of the fan with the T-belt.

[0073] 4) Adjust the T-belt installation position based on the position results in step 3;

[0074] Based on previous experimental data, a curve comparison chart was plotted to analyze favorable locations and verify them experimentally.

[0075] 5) Determine the optimal installation location for the T-belt;

[0076] Summarizing the above experimental results, the data for the T-strip located within the first two-thirds of the blade body from the guide edge to the trailing edge are generally better than the data for the blade body without the T-strip, and the experimental data for the T-strip located at the one-quarter position from the guide edge to the trailing edge of the blade body are optimal.

[0077] The experiment also found that the measured data from the horizontally placed platform were more stable. Furthermore, under normal circumstances, the fan's rotational speed is low when only driven by the fan, making it difficult to achieve a certain peak speed ratio. Therefore, the motor can be allowed to drive the fan to rotate first, and the no-load torque can be measured. With other conditions unchanged, the fan can be turned on, and the fan torque can be measured again. The difference between the two measurements is the true torque of the fan at this peak speed ratio. The incoming airflow velocity can be measured using an anemometer. The above method was used to measure the airflow velocity for fans with and without T-belts installed at different locations. After measurement, the data was recorded, and the fan's performance curve was plotted.

[0078] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A vertical axis fan blade with an efficiency-enhancing T-shaped belt, characterized in that, include: Blade body; A T-shaped band is provided on the outer surface of the blade body, and the overall direction of the T-shaped band extends along the span direction of the blade body. The T-shaped strip is parallel to the guide edge or follow edge of the blade body; The T-shaped strip is located at a quarter position from the leading edge to the trailing edge of the blade body.

2. The vertical axis fan blade with an efficiency-enhancing T-shaped belt according to claim 1, characterized in that: The T-shaped strip is straight.

3. The vertical axis fan blade with an efficiency-enhancing T-shaped belt according to claim 2, characterized in that: The end face of the T-shaped strip away from the blade body is a plane.

4. The vertical axis fan blade with an efficiency-enhancing T-shaped belt according to claim 1, characterized in that: The T-belt is made of rubber or metal.

5. The vertical axis fan blade with an efficiency-enhancing T-shaped belt according to claim 1, characterized in that: The two ends of the T-shaped strip extend to the ends of the blade body, respectively.

6. The vertical axis fan blade with an efficiency-enhancing T-shaped belt according to claim 1, characterized in that: The width value L´ of the T-shaped strip is 0.01 to 0.2 times the chord length L of the blade body, and the height value H´ of the T-shaped strip is 0.01 to 0.2 times the maximum airfoil thickness H of the blade body.

Images