CN202209250U

CN202209250U - Protrusion type horizontal axis wind turbine blade

Info

Publication number: CN202209250U
Application number: CN2011203262402U
Authority: CN
Inventors: 丛茜; 马毅; 刘玉荣; 金敬福; 田为军; 齐迎春; 华欣; 商延赓; 张成春; 石磊
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2011-09-02
Filing date: 2011-09-02
Publication date: 2012-05-02
Anticipated expiration: 2021-09-02

Abstract

The utility model relates to a protrusion type horizontal axis wind turbine blade belonging to the field of wind power generation. The technical scheme of the utility model is as follows: a blade air aerodynamic curve (2) protrudes forwards and has a ratio f/c of the maximum camber f to the expanding length c of 43 percent and the maximum camber position xf/c of 15.7 percent; and when the expanding length c is equal to 1, a curve fitting equation is as follows: y=-0.39828x<5>+11.2604x<4>-11.0205x<3>+3.6328x<2>+0.1004x+0.0095. A blade protrudes forwards in the front edge direction. Under the condition of no change of the traditional wind turbine blade design method, through changing the distribution shape of a blade wing type, the front pressure in a blade rotating direction is decomposed, the resistance (4) in a rotating process is reduced, the contact area of the blade and wind is increased, the air capturing volume is increased, so that the integral efficiency is increased; because airflow is decomposed, the flow direction is changed, a flow line (5) of the airflow flowing through the surface of the blade is lengthened, the airflow flow rate is reduced, blade stall is delayed, and a region of a blade adaptive wind speed is enlarged.

Description

Prominent type horizontal-shaft wind turbine blade before a kind of

Technical field

The utility model relates to a kind of novel horizontal axis wind generating blade, relates to wind power generation field, can effectively improve wind-power electricity generation efficient and enlarge wind energy conversion system adaptation wind speed range.

Background technique

Wind-power electricity generation is one of generation of electricity by new energy technology of the tool development prospect in the world today, and its extensive research and development utilization has become the emphasis of 21 century countries in the world new energy development.According to statistics, be about 0.7% of the total supply of electrical energy amount in the world to the shared ratio of 2006 wind-powered electricity generations in the end of the year, increase by 11 times (8%), will reach 12% of the total supply of electrical energy in the world to the year two thousand twenty to the end of the year 2010.China will account for 15% to the year two thousand twenty renewable energy sources in energy resource structure, the market demand reaches 3,980 hundred million dollars, and wherein wind energy accounts for 12%.

Current relatively surging wind energy demand fast, the problem of traditional wind-powered electricity generation also highlights gradually.The tradition pneumatic equipment blades made is guidance with momentum foline theory; Through choosing the high lift-drag ratio aerofoil profile; By the aerodynamic center of each aerofoil profile it is opened up to arrangement and to improve wind energy conversion system efficient; Yet how thereby it being optimized the arrangement of the operational efficiency that improves blade, the long term experience accumulation is essential, also is one of emphasis of various countries' technical monopoly.

Wind energy conversion system relies on wind wheel blade to draw wind energy, and wind wheel blade is one of wind power generating set core component, and it directly affects machine performance and cost, accounts for 20%～25% of complete machine cost.Along with the appearance of a collection of efficient aviation aerofoil profile, pneumatic equipment blades made progressively adopts the aviation aerofoil profile.But the long-term practice through people is used, and finds that the aviation aerofoil profile can not satisfy the requirement of wind energy conversion system and special running environment thereof well.From 20 middle of century, countries such as the U.S., Denmark and Holland are the basis with the aviation aerofoil profile in succession, begin the aerofoil profile that big quantity research is applicable to wind energy conversion system.In the nineties in last century; American Studies goes out NACA44, NACA63 and NERL S type wind mill airfoil; The mode of the human numerical optimizations such as Fuglsang of Denmark National Laboratory has proposed Ris Φ-A1, Ris Φ-P, Ris Φ-B1 wind mill airfoil; Sweden aeronautical research institute has proposed FFA-W1, WZ, W3 wind mill airfoil, and people such as the Timmer of Dutch Delft university and von Rooij utilizes XFOIL to develop DU aerofoil profile group.The big about-face of birth of wind energy conversion system special airfoil group the operating conditions of wind energy conversion system, increased the adaptability for working condition of blade, possess under the low wind speed and start, high wind speed postpones stall down, reduces functions such as the coarse susceptibilitys of blade inlet edge.Though the performance of blade significantly improves, its operational efficiency generally about 35%, this with nineteen twenty-six Bates compare according to the limiting efficiency 59.3% that aerodynamic principle calculates wind wheel under the perfect condition, also have very big room for promotion.

Because the continuous variation of occurring in nature wind speed; People recognize that change of wind velocity has bigger influence to wind mill performance; Be in the blade of stablizing propeller pitch angle always, can only have given play to its efficient in the certain wind speed scope, and under other wind speed; Efficient is very low always, so feather angle wind energy conversion system arises at the historic moment.Feather angle wind energy conversion system is the propeller pitch angle through continuous adjusting vane, makes it be in the optimal working state always and improves wind energy conversion system efficient.Though feather angle blade has improved wind energy conversion system efficient to a certain extent, its controlling mechanism is complicated, and the adjusting of wind speed variation sensing is had hysteresis, has therefore increased the manufacture cost and the effect and not obvious of wind energy conversion system greatly.No matter China wind-power electricity generation starting evening is in a backward condition in manufacturing and designing of the research of aerofoil profile, blade etc. always, therefore finds out the new way that improves fan blade efficient and then seems particularly important, needs to be resolved hurrily; To promoting the sustainable development of China, advocate green, health, energy-conservation living environment, improve people's quality of life and physical and mental health, all will play positive role, have wide development and application prospect, can obtain huge social and economic benefit.

Summary of the invention

The wind energy utilization that exists to present level axle pneumatic equipment blades made is low; Characteristics such as easy stall under the high wind speed; The utility model adopts the configuration of vane aerodynamic curve (2) from blade configuration, and blade wind energy utilization and suitable wind speed range are greatly improved.

For realizing above technical purpose, the technological scheme below the utility model will adopt:

Preceding prominent type horizontal-shaft wind turbine blade (1), aerodynamics curve (2) is preceding prominent, and the maximum camber f of this curve (coordinate y axle) is f/c=43% with exhibition to the ratio of length c (coordinate x axle), and the maximum camber position is x _f/ c=15.7%, x _fX axial coordinate for the maximum camber place; In exhibition be to length c=1 lower curve fit equation:

Y=-3.9828x ⁵+ 11.2604x ⁴-11.0205x ³+ 3.6328x ²+ 0.1004x+0.0095, the concrete coordinate figure of curve is as shown in table 1.

Point distribution on the prominent curve before the table 1

Fig. 5 is that preceding prominent type horizontal-shaft wind turbine blade makes up schematic representation, (a) is common blade, (b) is preceding prominent type blade.Pneumatic equipment blades made makes its aerodynamic center form along linear array by a series of aerofoil profiles by different angle of attack (7), and common blade (a) vane aerodynamic curve (2) is a straight line; Preceding prominent type blade (b) aerofoil profile is big or small, angle of attack (7) is identical with common blade (a), but the aerodynamic center of aerofoil profile is along above-mentioned curved arrangement.

Blade is prominent (3) before the leading edge direction, decomposed the positive pressure of blade sense of rotation, reduced the resistance in the rotary course (4); Owing to air-flow is decomposed, flow to change, the streamline of airflow passes blade surface (5) is elongated, thereby the air-flow velocity reduction, has postponed the blade stall phenomenon, promptly produces shimmy generation at the high wind speed lower blade, has increased the zone of blade adaptation wind speed.Blade prominent (3) before the leading edge direction has increased the area of contact of blade and wind, thereby makes that catching air quantity increases, and makes whole efficiency improve.

Not the utility model has the advantages that and need adopt other supplementary equipment, easy to process, simple, directly from blade configuration.Configuration prominent before the leading edge direction has reduced the resistance in the blade rotary course, has postponed the generation of blade stall phenomenon, makes blade integral operating conditions and efficient improve and improves.

Description of drawings

Fig. 1 (a) is preceding prominent type horizontal-shaft wind turbine blade plan view.

Fig. 1 (b) is the left view of Fig. 1 (a).

Fig. 1 (c) is the plan view of Fig. 1 (a).

Fig. 2 is the structural representation of preceding prominent type horizontal-shaft wind turbine blade.

Fig. 3 (a) is common horizontal axis pneumatic equipment blades made suction surface streamline schematic representation.

Fig. 3 (b) is the streamline schematic representation of preceding prominent type horizontal-shaft wind turbine blade suction surface.

Fig. 4 (a) is the common blade structural representation.

Fig. 4 (b) is the A-A sectional drawing of Fig. 4 (a).

Fig. 5 is that common blade and preceding prominent type horizontal-shaft wind turbine blade make up schematic representation.

Among the figure: 1. prominent type horizontal-shaft wind turbine blade 2. vane aerodynamic curves 2 before '. streamline 6. folines 7. angle of attack of common blade vane aerodynamic curve 3. blades resistance 5. airflow passes blade surfaces in prominent 4. rotary courses before the leading edge direction

A. be that preceding prominent type blade c. exhibition is to length (being the leaf exhibition) d. blade root for common blade b.

Embodiment

Fig. 4 (a), 4 (b) are the common blade structural representation, and blade comprises blade root and leaf exhibition, and blade root is a cylinder type, and length range is 0-0.375m, and all the other are the leaf exhibition.The leaf exhibition is arranged by the angle of attack (7) of certain sequence by cross section aerofoil profile (A-A), and it puts in order as shown in table 2.

Table 2 attack angle of blade distributes

Radius	The aerofoil profile chord length	The aerofoil profile angle of attack
			m	m	deg
0	0.218	0
			0.152	0.218	0
0.375	0.183	0
			0.5	0.349	6.7
0.559	0.441	9.9
			0.625	0.544	13.4
0.749	0.737	20.04
			0.835	0.728	18.074
1.002	0.711	14.292
			1.14	0.697	11.909
1.444	0.666	7.979
			1.749	0.636	5.308
1.835	0.627	4.715
			2.054	0.605	3.425
2.359	0.574	2.083
			2.664	0.543	1.15
2.677	0.542	1.115
			2.968	0.512	0.494
3.273	0.482	-0.015
			3.515	0.457	-0.381
3.578	0.451	-0.475
			3.883	0.42	-0.92
4.188	0.389	-1.352
			4.272	0.381	-1.469
4.492	0.358	-1.775
			4.521	0.355	-1.815

Fig. 5 is that common blade and preceding prominent type horizontal-shaft wind turbine blade make up schematic representation, (a) is common blade, aerofoil profile aerodynamic center line, and promptly aerodynamics curve (2) is a straight line.Do not change the common blade aerofoil profile size, put in order and angle of attack (7) etc., the aerodynamic center that makes aerofoil profile is by curvilinear equation

Y=-3.9828x ⁵+ 11.2604x ⁴-11.0205x ³+ 3.6328x ²+ 0.1004x+0.0095 arranges, prominent type horizontal-shaft wind turbine blade (b) before making up.

Above-mentioned example is the construction method of preceding prominent blade, and any common blade all can be implemented according to the method described above.

Claims

1. prominent type horizontal-shaft wind turbine blade before a kind; Comprise foline, the angle of attack and vane aerodynamic curve, it is characterized in that said vane aerodynamic curve (2) is preceding prominent; The maximum camber f of preceding prominent curve is f/c=43% with exhibition to the ratio of length c, and the maximum camber position is x _f/ c=15.7%; Exhibition is when length c=1, and the curve fitting equation is:

y＝-3.9828x ⁵+11.2604x ⁴-11.0205x ³+3.6328x ²+0.1004x+0.0095。

2. a kind of preceding prominent type horizontal-shaft wind turbine blade according to claim 1 is characterized in that the concrete coordinate of said vane aerodynamic curve (2) meets shown in the following table: