CN213928624U

CN213928624U - Vane with high lift-drag ratio coefficient

Info

Publication number: CN213928624U
Application number: CN202022323769.0U
Authority: CN
Inventors: 李治国; 郝波; 闫文刚; 宋超洋; 陈猛
Original assignee: Inner Mongolia University of Technology
Current assignee: Inner Mongolia University of Technology
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-08-10
Anticipated expiration: 2030-10-20

Abstract

The utility model provides a high lift-drag ratio coefficient blade relates to wind energy and utilizes technical field. The blade comprises blade airfoil and blade root two parts, and the blade airfoil is formed by ten smooth transitional coupling of airfoil cross-section, and the airfoil cross-section is thin and crooked, the airfoil cross-section comprises suction surface curve and pressure surface curve, and airfoil cross-section leading edge has certain radian, and airfoil cross-section trailing edge point and crooked, airfoil cross-section maximum thickness 9.01% is on 30.0% chord, and 6.0% maximum curved surface is on 39.6% chord, and the blade root part is formed through setting out and blade airfoil transitional coupling by a 120 fan-shaped structure, paints the epoxy material at the blade leading edge, and the lightning rod is fixed to the apex, the utility model discloses the blade appearance is smooth, and aerodynamic performance is good, simple structure, and the start-up wind speed is low, and aerodynamic noise is little.

Description

Vane with high lift-drag ratio coefficient

Technical Field

The utility model relates to a wind energy conversion system blade specifically is a high lift-drag ratio coefficient blade, belongs to wind energy and utilizes technical field.

Background

There are many good wind fields in the world today, mainly lie in that the blade can not fine utilization wind energy, lead to the generating efficiency greatly reduced, the power consumption is that our modern life is necessary, 70 ~ 80% is the power consumption among the articles for daily use, china makes great adjustment to energy structure in recent years, the new forms of energy are our national energy of key development now, the shared proportion greatly increased of wind power generation, however, wind energy machine wind energy utilization efficiency is very low, make the wind energy not obtain the most efficient utilization, so must improve wind power generation wind energy utilization ratio, to above-mentioned problem the utility model discloses a high lift-drag ratio coefficient blade has been designed.

SUMMERY OF THE UTILITY MODEL

Aiming at the problem of low wind energy utilization rate, a blade with high lift-drag ratio coefficient is provided.

The utility model discloses a following technical scheme realizes above-mentioned purpose: the utility model provides a high lift-drag ratio coefficient blade, blade comprise blade airfoil and blade root two parts, and the blade airfoil is formed by the smooth transitional coupling of airfoil cross-section, the blade leading edge has certain radian, and blade trailing edge point is crooked, the airfoil cross-section comprises suction surface curve and pressure surface curve two parts, suction surface curve and pressure surface curve comprise 241 groups space coordinates, 241 groups space coordinates are decided by the airfoil chord length, the chord can be got by calculating, carries out the torsion angle setting to every airfoil cross-section, and the blade root part is formed by a 120 fan-shaped structure through lofting and blade airfoil transitional coupling, the changeover portion is obtained by 120 fan-shaped structure and blade airfoil lofting, paints anticorrosive material epoxy at the blade leading edge, and the lightning rod is fixed to the apex.

The utility model has the advantages that: the experimental result shows that the wind energy utilization rate reaches 0.46, the wind energy utilization rate of the traditional blade is 0.36, the wind energy utilization rate is improved by about 0.10 compared with the wind energy utilization rate of the traditional blade, the effect is very obvious, the minimum starting wind speed is 2-10 m/s, the starting wind speed is lower than that of the traditional blade, the wing section is thin, the weight is light, materials are saved, the blade is economical and practical, the processing cost is lower, the front edge of the blade is coated with anticorrosive material epoxy resin, the front edge of the blade is guaranteed not to be damaged, and the lift-drag ratio is further influenced.

Drawings

FIG. 1 is a general schematic view of a blade;

FIG. 2 is a general cross-sectional view of the blade;

FIG. 3 is a schematic view of a blade airfoil;

FIG. 4 is a schematic cross-sectional view of a blade;

FIG. 5 is a schematic view of a 120 sector configuration of the root portion;

the numbers in the figures illustrate the following:

1. a first airfoil section; 2. a second airfoil section; 3. an airfoil section III; 4. a fourth airfoil section; 5. a fifth airfoil section; 6. a sixth airfoil section; 7. an airfoil section seven; 8. an aerofoil section eight; 9. ninth, airfoil section; 10. ten airfoil sections; 11. a transition section; 12. a 120-degree fan-shaped structure; 13. bolt holes; 14. a blade leading edge; 15. a blade trailing edge; 16. an epoxy resin coating; 17. a lightning rod; 18. a thin metal sheet; 19. A wire; 20. a bolt; 21. a suction surface curve; 22. pressure surface curve.

Detailed Description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention, and it is obvious that the described examples are only some examples of the present invention, but not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the utility model.

Referring to fig. 1-5, a high lift-drag ratio coefficient blade is characterized by comprising a blade airfoil and a blade root, wherein the blade airfoil is formed by connecting a first airfoil section (1), a second airfoil section (2), a third airfoil section (3), a fourth airfoil section (4), a fifth airfoil section (5), a sixth airfoil section (6), a seventh airfoil section (7), an eighth airfoil section (8), a ninth airfoil section (9) and a tenth airfoil section (10) in a smooth transition manner, the airfoil section is formed by connecting a suction surface curve (21) and a pressure surface curve (22), the suction surface curve (21) and the pressure surface curve (22) are smoothly connected by 241 sets of space coordinates, a leading edge (14) of the blade has a certain radian, a trailing edge (15) of the blade is bent sharply, a connecting point of the leading edge and the trailing edge is a so-called chord, and the blade root is formed by connecting a 120-degree fan-shaped structure (12) with the blade airfoil in a transition manner by lofting, the transition section (11) is obtained by lofting a 120-degree fan-shaped structure (12) and a blade airfoil, the front edge of the blade is coated with an epoxy resin (16) anti-corrosion material, the problem that the smoothness of the front edge of the blade is damaged due to long-term corrosion caused by acid rain or wind is solved, a lightning rod (17) is fixed at the blade tip, the inner end of the lightning rod (17) is fixed by an upper thin metal sheet and a lower thin metal sheet (18), the thin metal sheets (18) are provided with two bolt holes (13), the bolt holes (13) are connected with a lead (19) for fixation, the lead (19) is connected with a bolt (20) at the blade root at the front end, a grounding wire is connected with the bolt (20) through a tower frame, the lead is conducted into the ground, lightning stroke is avoided, and the blade is damaged.

In the design of wind energy machine blade, the important variable of wind energy efficiency is lift-drag ratio, and lift-drag ratio is the ratio of lift force and the resistance of blade promptly, and it is not as high as better to know the lift-drag ratio by the performance curve of airfoil, and when the angle of attack exceeded certain numerical value, lift can descend suddenly, and the resistance can rise suddenly, at this moment, the wind-force machine can get into the stall state, and the stall state can make the generating efficiency descend, makes wind energy machine blade suffer damage, the utility model relates to an optimum angle of attack be 5 to be difficult to get into the stall state, the control stall that can be fine comes in advance, and the design of each angle of torsion makes the angle of attack maintain near 5 constantly, and aerodynamic performance is in optimum always.

Preferably, the blade material with the high lift-drag ratio coefficient is a wood material, the specific material is pine, and the material is easy to obtain and process, and is convenient and simple.

The utility model discloses a high lift-drag ratio coefficient blade, this blade is thin and crooked, and the surface is smooth, and the blade just can furthest catch the wind energy like this, has improved the efficiency that the wind energy turned into the electric energy. In a word, this blade structural design is reasonable, and is firm reliable.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A high lift-drag ratio coefficient blade is characterized by comprising a blade airfoil and a blade root, wherein the blade airfoil is formed by connecting a first airfoil section (1), a second airfoil section (2), a third airfoil section (3), a fourth airfoil section (4), a fifth airfoil section (5), a sixth airfoil section (6), a seventh airfoil section (7), an eighth airfoil section (8), a ninth airfoil section (9) and a tenth airfoil section (10) in a smooth transition manner, the airfoil section consists of a suction surface curve (21) and a pressure surface curve (22), the suction surface curve (21) and the pressure surface curve (22) are formed by connecting 241 groups of space coordinates in a smooth manner, a leading edge (14) of the blade has a certain radian, a trailing edge (15) of the blade is pointed and curved, the connecting point of the leading edge and the trailing edge is a so-called chord, the blade root is formed by connecting a 120-degree fan-shaped structure (12) with the blade airfoil in a transition manner by lofting, the transition section (11) is obtained by lofting a 120-degree fan-shaped structure (12) and a blade airfoil, the front edge of the blade is coated with an epoxy resin (16) anti-corrosion material, the problem that the smoothness of the front edge of the blade is damaged due to long-term corrosion caused by acid rain or wind is solved, a lightning rod (17) is fixed at the blade tip, the inner end of the lightning rod (17) is fixed by an upper thin metal sheet and a lower thin metal sheet (18), the thin metal sheets (18) are provided with two bolt holes (13), the bolt holes (13) are connected with a lead (19) for fixation, the lead (19) is connected with a bolt (20) at the blade root at the front end, a grounding wire is connected with the bolt (20) through a tower frame, the lead is conducted into the ground, lightning stroke is avoided, and the blade is damaged.

2. The vane as set forth in claim 1, wherein: the twist angles of the first to the tenth of the airfoil section are 27.63 degrees, 18.44 degrees, 12.94 degrees, 9.40 degrees, 6.96 degrees, 5.18 degrees, 3.78 degrees, 2.58 degrees, 1.32 degrees and 0.50 degrees in sequence.

3. The vane as set forth in claim 1, wherein: the chord lengths of the airfoil sections from one to ten are 120.1mm, 105.3mm, 86.7mm, 71.9mm, 60.9mm, 52.6mm, 46.1mm, 40.5mm, 32.9mm and 18.7mm in sequence.

4. The vane as set forth in claim 1, wherein: the Reynolds number is between 1350000 and 137000, the lift-drag ratio coefficient is between 70 and 80, and the starting wind speed is between 2m/s and 10 m/s.

5. The vane as set forth in claim 1, wherein: the rated power is 293W-301W, and the rated rotating speed is 473 r/min-480 r/min.

6. The vane as set forth in claim 1, wherein: a layer of epoxy resin is coated on the front edge of the blade, and the epoxy resin is coated on the suction surface and the pressure surface by 10-12 mm from the center of the front edge of the blade, so that the blade has good corrosion resistance.

7. The vane as set forth in claim 1, wherein: the material of the blade is wood.