Horizontal shaft lift force type wind turbine blade with slotted front edge of blade tip

Abstract

The horizontal shaft lift force type wind turbine blade with the blade tip front edge slotted comprises a wind turbine blade body, the wind turbine blade body is provided with a high-pressure face and a low-pressure face, the wind turbine blade body is provided with a front edge and a rear edge, any end of the wind turbine blade body is provided with a drainage seam, and the drainage seam is provided with a starting end and a stopping end. Part of airflow flows from the high-pressure surface to the low-pressure surface through the drainage seams, a stable airflow layer is formed on the low-pressure surface, the airflow redistribution can reduce the pressure difference of the wingtip area and weaken the spanwise flowing of the airflow, and therefore generation of wingtip vortexes is restrained, induced resistance is reduced, and compared with a traditional blade, the blade has the advantages that the blade is simple in structure and convenient to use. The power of the wind turbine and the wind energy utilization coefficient under the same tip speed ratio are obviously improved.

Description

Technical Field

[0001] This utility model relates to the technical field of horizontal axis lift wind turbine blades, and in particular to a horizontal axis lift wind turbine blade with a slit at the leading edge of the blade tip. Background Technology

[0002] Wind energy, as a clean and pollution-free renewable energy source, has been utilized by humans for a long time. After decades of development, wind turbine power generation has become one of the more mature technologies. As the main equipment for generating wind energy, the performance of the wind turbine blades directly affects the output power of the turbine. From the perspective of rotation direction, wind turbines are mainly divided into horizontal axis wind turbines and vertical axis wind turbines. From the perspective of the type of effective force driving the rotation of the wind turbine, wind turbines are divided into lift type and drag type.

[0003] However, during the rotation of the blades of horizontal axis lift wind turbines, the presence of pressure difference generates a strong flow phenomenon at the wingtip, forming a wingtip vortex. The wingtip increases induced drag and reduces the aerodynamic efficiency of the wind turbine. In addition, traditional wind turbines have difficulty starting under low wind speed conditions and have insufficient torque, resulting in low power generation efficiency.

[0004] Therefore, it is essential to provide a horizontal axis lift wind turbine blade with a slit at the leading edge of the blade tip to address the shortcomings of existing technologies. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a horizontal axis lift wind turbine blade with a slit leading edge at the blade tip. This blade allows part of the airflow to flow from the high-pressure side to the low-pressure side through the guide slot, forming a stable airflow layer on the low-pressure side. This airflow redistribution can reduce the pressure difference in the wingtip region and weaken the spanwise flow of the airflow, thereby suppressing the generation of wingtip vortices and reducing induced drag. Compared with traditional blades, the power of the wind turbine and the wind energy utilization coefficient at the same tip speed ratio are significantly improved.

[0006] The above-mentioned objectives of this utility model are achieved through the following technical means.

[0007] A horizontal axis lift wind turbine blade with a slit at the leading edge of the blade tip is provided, including a wind turbine blade body, a high-pressure surface and a low-pressure surface on the wind turbine blade body, a leading edge and a trailing edge on the wind turbine blade body, and a flow guide slit at any end of the wind turbine blade body, the flow guide slit having a starting end and a terminating end.

[0008] The side view section of the drainage seam has a trajectory centerline M. The angle A between the trajectory centerline M and the side view section of the high-pressure surface is 90°, and the angle B between the trajectory centerline M and the side view section of the low-pressure surface is 20°.

[0009] Specifically, the chord length of the wind turbine blade body is D, the distance from the starting end of the trajectory centerline M to the leading edge is d1, d1 = 5%D, and the distance from the ending end of the trajectory centerline M to the leading edge is d2, d2 = 10%D.

[0010] Preferably, the width of the starting end of the side view section of the drainage seam is L1, where L1 = 2%D, and the width of the ending end of the side view section of the drainage seam is L2, where L2 = 1%D.

[0011] Specifically, the top view cross-sectional length of the drainage seam is L3, where L3 = 10%D.

[0012] This invention allows some airflow to flow from the high-pressure side to the low-pressure side through the diversion slot, forming a stable airflow layer on the low-pressure side. This airflow redistribution can reduce the pressure difference in the wingtip region and weaken the spanwise flow of airflow, thereby suppressing the generation of wingtip vortices and reducing induced drag. Compared with traditional blades, the power of the wind turbine and the wind energy utilization coefficient at the same tip speed ratio are significantly improved. Attached Figure Description

[0013] The present invention will be further described with reference to the accompanying drawings, but the content of the drawings does not constitute any limitation on the present invention.

[0014] Figure 1 This is a top view schematic diagram of a horizontal axis lift wind turbine blade with a slit at the leading edge of the blade tip, according to this utility model.

[0015] Figure 2 This is a side view schematic diagram of a horizontal axis lift wind turbine blade with a slit at the leading edge of the blade tip, according to this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of a horizontal axis lift wind turbine blade with a slit at the leading edge of the blade tip, according to this utility model.

[0017] Figure 4 This is an enlarged schematic diagram of point A of a horizontal axis lift wind turbine blade with a slit at the leading edge of the blade tip, according to this utility model.

[0018] Figure 5 This is an enlarged schematic diagram of section B of a horizontal axis lift wind turbine blade with a slit at the leading edge of the blade tip, according to this utility model.

[0019] from Figures 1 to 5 Including:

[0020] 1. Main body of wind turbine blades;

[0021] 2. High-pressure surface;

[0022] 3. Low-pressure surface;

[0023] 4. Leading edge;

[0024] 5. Trailing edge;

[0025] 6. Drainage seam;

[0026] 7. Starting end;

[0027] 8. Termination end. Detailed Implementation

[0028] The present invention will be further described in conjunction with the following embodiments.

[0029] Example 1.

[0030] like Figure 1-5 As shown, a horizontal axis lift wind turbine blade with a slit at the leading edge 4 of the blade tip includes a wind turbine blade body 1, a high-pressure surface 2 and a low-pressure surface 3 on the wind turbine blade body 1, a leading edge 4 and a trailing edge 5 on the wind turbine blade body 1, and a flow guide slit 6 at any end of the wind turbine blade body 1, with a starting end 7 and a ending end 8.

[0031] The side view section of the drainage seam 6 has a trajectory centerline M. The trajectory centerline M and the side view section of the high pressure surface 2 have an angle A of 90°, and the trajectory centerline M and the side view section of the low pressure surface 3 have an angle B of 20°.

[0032] The chord length of the wind turbine blade body 1 is D. The distance from the starting end 7 of the trajectory centerline M to the leading edge 4 is d1, where d1 = 5%D. The distance from the ending end 8 of the trajectory centerline M to the leading edge 4 is d2, where d2 = 10%D.

[0033] The width of the starting end 7 of the side view section of the drainage joint 6 is L1, where L1 = 2%D, and the width of the ending end 8 of the side view section of the drainage joint 6 is L2, where L2 = 1%D.

[0034] The top view length of the drainage joint 6 is L3, where L3 = 10%D.

[0035] During the wind turbine startup phase, some air enters from the starting end 7 of the guide slot 6 and exits from the ending end 8 of the guide slot 6. When the wind turbine blade body 1 is stationary or at a low speed, the angle of attack with the incoming airflow is large, causing airflow separation on the low-pressure surface 3, thereby reducing lift. The guide slot 6 can smoothly guide the airflow to the low-pressure surface 3, effectively preventing airflow separation, thereby increasing the lift coefficient of the wind turbine blade body 1 under low wind speed conditions, increasing torque at low speeds and reducing startup wind speed. After the wind turbine starts, the wind turbine speed gradually increases, and the airflow flows through the guide slot 6 at the leading edge 4 of the wind turbine blade body 1. Some airflow flows from the high-pressure surface 2 to the low-pressure surface 3 through the guide slot 6, forming a stable airflow layer on the low-pressure surface 3. This airflow redistribution can reduce the pressure difference in the wingtip region and weaken the spanwise flow of the airflow, thereby suppressing the generation of wingtip vortices and reducing induced drag.

[0036] This invention allows some airflow to flow from the high-pressure surface 2 to the low-pressure surface 3 through the diversion slot 6, forming a stable airflow layer on the low-pressure surface 3. This airflow redistribution can reduce the pressure difference in the wingtip region and weaken the spanwise flow of the airflow, thereby suppressing the generation of wingtip vortices and reducing induced drag. Compared with traditional blades, the power of the wind turbine and the wind energy utilization coefficient at the same tip speed ratio are significantly improved.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A horizontal-axis lift-type wind turbine blade with a slit at the leading edge of the blade tip, characterized in that: The wind turbine blade body includes a high-pressure surface and a low-pressure surface, a leading edge and a trailing edge, and a flow guide slit at any end of the wind turbine blade body, the flow guide slit having a starting end and a ending end. The side view section of the drainage seam has a trajectory centerline M. The trajectory centerline M and the side view section of the high-pressure surface form an angle A of 90°, and the trajectory centerline M and the side view section of the low-pressure surface form an angle B of 20°.

2. The horizontal axis lift wind turbine blade with a slit leading edge at the blade tip according to claim 1, characterized in that: The chord length of the wind turbine blade body is D, the distance from the starting end of the trajectory centerline M to the leading edge is d1, d1 = 5%D, and the distance from the ending end of the trajectory centerline M to the leading edge is d2, d2 = 10%D.

3. The horizontal axis lift wind turbine blade with a slit leading edge at the blade tip according to claim 2, characterized in that: The width of the starting end of the side view section of the drainage seam is L1, where L1 = 2%D, and the width of the ending end of the side view section of the drainage seam is L2, where L2 = 1%D.

4. The horizontal axis lift wind turbine blade with a slit leading edge at the blade tip according to claim 3, characterized in that: The top-view cross-sectional length of the drainage seam is L3, where L3 = 10%D.

Images