CN201428551Y

CN201428551Y - Wind generator blade employing concave-convex front edge structure

Info

Publication number: CN201428551Y
Application number: CN2009201103052U
Authority: CN
Inventors: 张明明; 黄宸武; 宋娟娟; 徐建中
Original assignee: Institute of Engineering Thermophysics of CAS
Current assignee: Institute of Engineering Thermophysics of CAS
Priority date: 2009-07-22
Filing date: 2009-07-22
Publication date: 2010-03-24
Anticipated expiration: 2019-07-22

Abstract

The front edge part of the wind generator blade employing a concave-convex front edge structure is an uneven structure; or the front edge part of the root of the blade, or the front edge part of the middle part of the blade, or the front edge part of the end of the blade is an uneven structure; or the front edge part of the root of the blade and the middle part of the blade, or the front edge partof the middle part of the blade and the end of the blade, or the front edge part of the root of the blade and the end of the blade is an uneven structure. The wind generator blade is characterized inthat the front edge of the wind generator blade is designed as an uneven surface, so as to change the flow state of the blade during the operation. The flow rate is increased after the airflow bypasses the concave-convex structure, so as to ensure that the airflow can keep the attached flow on the blade for a long time; when the airflow is guided to move around a profile peak, a vortex can be formed on the suction force surface of the blade, therefore, the contaminant is swept from the ground, and meanwhile, the changeover with the momentum of a free layer is increased, and the negative pressure gradient is reduced. Because the embodied energy of the turbulent boundary layer is more than that of the laminar boundary layer, the separation of the boundary layer is delayed.

Description

A kind of blade of wind-driven generator of concavo-convex leading edge structure

Technical field

The utility model relates to a kind of blade of wind-driven generator, especially a kind of blade of wind-driven generator of concavo-convex leading edge structure.This generator blade also has the lift-rising drag reduction except that having opposing insect contamination, sand and dust and sleet corrodes, characteristics such as improve overall efficiency and increase the service life.

Background technique

The operation of wind-driven generator is affected by environment bigger, for example: the erosion of insect contamination, sand and dust and sleet all can exert an influence to the blade of wind-driven generator surface roughness, thereby cause the deterioration of blade of wind-driven generator aeroperformance, finally cause the reduction of overall efficiency, the minimizing of generated energy and the shortening in life-span.Existing solution is: freeze for sleet, heating system is installed on blade usually, take the method for direct resistance heating to prevent that blade from freezing, also have at blade surface brushing black coating, absorb heat by illumination and to make ice dissolution, in addition, adopt hot air or some other thermal-radiating indirect heating mode that application is also arranged in blade interior; For the pollution of insect and sand and dust, take to shut down the method for cleaning more, also have the method that adopts surperficial pad pasting prevent insect, sand and dust on blade adhere to and to the bump and the erosion of blade; Yet these methods all need expend a large amount of man power and materials, and are extremely unfavorable to the economical operation of wind-driven generator.

The model utility content

The purpose of this utility model provides a kind of blade of wind-driven generator of concavo-convex leading edge structure, to improve the defective that exists in the known technology.

For achieving the above object, the blade of wind-driven generator of the concavo-convex leading edge structure that the utility model provides is characterized in, the leading edge position of whole blade is rough structure; Or the blade tip leading edge position of leading edge or blade is rough structure in the leaf of the blade root leading edge of blade or blade; Perhaps leading edge in the blade root of blade and the leaf, or in the leaf of blade and the blade tip leading edge, or the blade root of blade and blade tip leading edge position are rough structure.

The blade root of the utility model indication is meant the length of blade place of 0-1/3, is meant 1/3-2/3 length of blade place in the leaf, and blade tip is meant 2/3-1 length of blade place.

Correspondingly, be meant 0-2/3 length of blade place in blade root and the leaf, be meant 1/3-1 length of blade place with blade tip in the leaf, blade root and blade tip are meant 0-1/3 length of blade place+2/3-1 length of blade place.

Concaveconvex structure of the present utility model is the waveform or the different shapes such as trapezoidal or triangle of evenly distribution or uneven distribution, also can be the combination in any of above-mentioned different shape.

The utility model is designed to rough surface with the leading edge of blade of wind-driven generator, the flowing state when changing blade working.Air-flow is walked around after the concaveconvex structure, flows to quicken, and makes air-flow long period on blade keep adhering to mobile, air-flow is directed forming vortex around the motion of protruding peak at blade suction surface, and pollutant is swept from the blade face, the exchange of enhancing and free layer momentum simultaneously reduces suction gradient.Because turbulent boundary layer contains can be more than laminar boundary layer, make boundary layer separation postpone.

Description of drawings

Fig. 1 is a wind-driven generator complete machine profile;

Fig. 2 is a wind-driven generator complete machine front elevation;

Fig. 3 a is the plane enlarged diagram of 401 parts among Fig. 2, has shown that the utility model leading edge position is corrugated structure, and Fig. 3 b is the 3 d effect graph after 401 partial rotation among Fig. 2;

Fig. 4 a is the plane enlarged diagram of 401 parts among Fig. 2; Shown that the utility model leading edge position is trapezoidal structure, Fig. 4 b is the 3 d effect graph after 401 partial rotation among Fig. 2;

Fig. 5 a is the plane enlarged diagram of 401 parts among Fig. 2, has shown that the utility model leading edge position is leg-of-mutton structure, and Fig. 5 b is the 3 d effect graph after 401 partial rotation among Fig. 2.

Embodiment

Please in conjunction with illustrated in figures 1 and 2, wind-driven generator is by pylon 1, cabin 2,

wheel hub

3 and 2 or a plurality of blade 4 compositions, blade 4 is installed on the wheel hub 3, when Fig. 1 wind speed V blows to blade of wind-driven generator 4, wind acts on the blade 4, the kinetic energy of a part of wind is converted into promotes blade 4 rotating moment, makes blade 4 drive wheel hubs 3 horizontal middle spindle rotation of 2 around the cabin, wind energy is converted into mechanical energy, by the generator in the cabin 2 mechanical energy is converted into electric energy output again.Distinguished and admirable when blade 4, be to flow into from blade inlet edge 401, toward the trailing edge development, separate then at certain position air-flow, form the tail district at trailing edge, flow out blade.

The generator blade that the utility model adopts is assembled on the known wind-driven generator, and its package technique is a known technology, and the emphasis of neither the utility model telling about, and does not therefore launch to describe in detail.

Characteristics of the present utility model are, the leading edge position of generator blade is rough structure, and this rough structure can be any shape that can imagine out.The utility model is that concrete example explains with common and waveform (shown in Fig. 3 a and Fig. 3 b), trapezoidal (shown in Fig. 4 a and Fig. 4 b) or triangle structure shapes such as (shown in Fig. 5 a and Fig. 5 b) that the enough text descriptions of energy are come out only.

The leading edge position of blade of the present utility model can all be designed to rough structure, and perhaps blade tip (being meant 2/3-1 length of blade place) the leading edge position of (being meant 1/3-2/3 length of blade place) leading edge or blade is designed to rough structure in the leaf of blade root (being meant the length of blade place of the 0-1/3) leading edge of blade, blade; Also can be in the blade root of blade and leaf leading edge, or in the leaf of blade and the blade tip leading edge, or the blade root of blade and blade tip leading edge position are rough structure.

Concaveconvex structure of the present utility model can be designed to distribute equably at the leading edge position of blade, also can be designed to anisotropically distribute, its structure shape can be different shapes such as waveform, trapezoidal and triangle, also can be the combination in any of above-mentioned different shape.

Correspondingly, be meant 0-2/3 length of blade place in blade root and the leaf, be meant 1/3-1 length of blade place with blade tip in the leaf, blade root and blade tip are meant 0-1/3 length of blade place+2/3-1 length of blade place, but above-mentioned length is not strictly to limit, just as understanding and implementing a general size of the present utility model.

By the rough structure of blade of wind-driven generator leading edge, the pollutant in the air-flow is swept from the blade face, and blade lift is increased, resistance reduces, thereby improve the overall efficiency of wind-driven generator, the adverse effect of avoiding environment to cause, the working life of prolongation wind-driven generator to wind-driven generator.

Compare with traditional blade of wind-driven generator, concavo-convex leading edge structure blade can effectively stop the elder brother The adhesion on blade of worm, sand and dust, sleet, and increase the lift of blade, reduce the resistance of blade, Increase the lift-drag ratio of blade, namely have the effect of automatically cleaning and lift-rising drag reduction; Can overcome environment to wind In the time of the power generator effect of aerodynamic performance, make the power output of wind-driven generator obtain increasing, and prolong The service life of long wind-driven generator.

Claims

1, a kind of blade of wind-driven generator of concavo-convex leading edge structure is characterized in that, the leading edge position of blade is rough structure.

2, a kind of blade of wind-driven generator of concavo-convex leading edge structure is characterized in that, leading edge position or blade tip leading edge position are rough structure in the blade root leading edge position of blade or the leaf.

3, a kind of blade of wind-driven generator of concavo-convex leading edge structure is characterized in that, leading edge in the blade root of blade and the leaf, or in the leaf and the blade tip leading edge, or blade root and blade tip leading edge position are rough structure.

As the blade of wind-driven generator of claim 1,2 or 3 described concavo-convex leading edge structures, it is characterized in that 4, concaveconvex structure is evenly to distribute or the waveform of uneven distribution or trapezoidal or triangular shaped.

As the blade of wind-driven generator of claim 1,2 or 3 described concavo-convex leading edge structures, it is characterized in that 5, concaveconvex structure is evenly to distribute or the waveform of uneven distribution, trapezoidal and triangular shaped combination in any.

As the blade of wind-driven generator of claim 2 or 3 described concavo-convex leading edge structures, it is characterized in that 6, blade root is meant the length of blade place of 0-1/3, be meant 1/3-2/3 length of blade place in the leaf, blade tip is meant 2/3-1 length of blade place.

7, the blade of wind-driven generator of concavo-convex leading edge structure as claimed in claim 3, it is characterized in that, be meant 0-2/3 length of blade place in blade root and the leaf, be meant 1/3-1 length of blade place with blade tip in the leaf, blade root and blade tip are meant 0-1/3 length of blade place+2/3-1 length of blade place.