CN104214054A - Small-sized wind power generator blade - Google Patents

Abstract

The invention discloses a small-sized wind power generator blade. The upper wing surface coordinates of a wing section adopted by the blade satisfies an equation: y1=(-0.6286)*x<4>+1.448*x<3>-1.454*x<2>+0.6346*x+1.274*10<(-4)>; the lower wing surface of the wing section satisfies an equation: y2=0.4258*x<4>-1.064*x<3>+0.6204*x<2>+0.01808*x-2.298*10<(-4)>, wherein the x is greater than or equal to 0 and is smaller than or equal to 1; when x is greater than or equal to 0 and smaller than or equal to 0.02, the upper wing surface and the lower wing surface are in smooth transition. The blade is constructed by the wing section according to an installing angle. Compared with a standard blade, the blade has the advantage that the efficiency is increased by 26.48 percent.

Description

A kind of small-sized wind power generator blade

Technical field

The present invention relates to a kind of power generating equipment, particularly a kind of small-sized wind power generator blade.

Technical background

Wind energy, inexhaustible.In the world today of resource scarcity, effective utilization of wind energy is more and more subject to extensive concern.

Small wind, as a supplementary technology of Wind Power Generation Industry, completes or solves large-scale wind electricity industry and can not complete or indeterminable problem.Such as in China Fujian, province, Deng Di wind speed district, Yunnan, because wind speed is throughout the year lower, cannot meet the work requirements of large scale wind power machine, large-scale wind electricity does not possess development condition in locality, and relatively low small wind turbine is required to wind speed, but in locality, there is the larger market space.The wind energy resources distribution situation of China determines small wind turbine and has vast potential for future development in China's most area.

Aerofoil profile determines Blade Properties, and blade determines wind energy conversion system efficiency.Improving small wind turbine and carrying in the process of effect, blade is crucial, and aerofoil profile is basis.

The present invention finds inspiration from bionics, through correlative study to birds wing, sums up a kind of new aerofoil, and builds the established angle of blade to aerofoil profile and corresponding chord length designs, and obtains a kind of new small-sized wind power generator blade.Learn through test, blade of the present invention is compared with rule blade, and efficiency improves 26.48%.

Summary of the invention

The object of this invention is to provide a kind of small-sized wind power generator blade, the present invention is directed to the phenomenon that existing small wind engine efficiency has much room for improvement, provide the modified parameters of pneumatic equipment blades made, comprise the established angle of aerofoil profile when aerofoil profile equation in coordinates, structure blade and corresponding chord length, improve the wind energy utilization of small-sized wind power generator.

Blade of the present invention (2) is made up of aerofoil profile (1), and wherein the top airfoil A coordinate of aerofoil profile (1) meets equation:

Y1=-0.6286*x^4+1.448*x^3-1.454*x^2+0.6346*x+1.274*10^ (-4) (I), the lower aerofoil B coordinate of aerofoil profile (1) meets equation:

Y2=0.4258*x^4-1.064*x^3+0.6204*x^2+0.01808*x-2.298*10^ (-4) (II), wherein: 0≤x≤1, at 0≤x≤0.02 place, top airfoil A, lower aerofoil B seamlessly transit;

Described aerofoil profile (1) meets following table in the exhibition of blade (2) difference to the chord length (c) on position and established angle (θ):

Table 1

Exhibition is to position (mm)	Chord length c (mm)	Established angle θ (°)
			0-50	Blade root	0
50	44	17.20
			100	100	18.20
150	100	17.45
			200	77	13.3157
250	56	10.3242
			300	49	8.2272
350	45	6.6843
			400	41	5.5049
450	37	4.5759
			500	33	3.8259
550	29	3.2082

Beneficial effect of the present invention:

The present invention is with standard air generator blade and standard aerofoil profile object as a comparison.Aerofoil profile of the present invention is compared with standard aerofoil profile, and lift coefficient is comparatively large, and ratio of lift coefficient to drag coefficient is comparatively large, and aeroperformance is more excellent, and built the blade obtained by this aerofoil profile, through verification experimental verification, efficiency improves 26.48% compared with rule blade.The present invention realizes by improving aerofoil profile and optimizing established angle the improvement of wind energy conversion system, does not change the conventional machining process of blade, widely applicable.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of aerofoil profile of the present invention.

Fig. 2 is the plan view of blade of the present invention.

Fig. 3 is the left view of blade of the present invention.

Fig. 4 is the plan view of blade of the present invention.

Fig. 5 is the structural representation of blade of the present invention.

Fig. 6 is the A-A sectional drawing in Fig. 5.

Fig. 7 be aerofoil profile of the present invention and standard aerofoil profile reynolds' number be 100000, the angle of attack be 0 ~ 20 ° time lift coefficient correlation curve figure.

Fig. 8 be aerofoil profile of the present invention and standard aerofoil profile reynolds' number be 100000, the angle of attack be 0 ~ 20 ° time ratio of lift coefficient to drag coefficient correlation curve figure.

Fig. 9 be blade of the present invention and rule blade when wind speed is 0 ~ 10.7m/s, test the power contrast's plotted curve obtained.

In figure: 1-aerofoil profile, 2-blade, 3-blade root, 4-Curve guide impeller part, c-chord length, A-top airfoil, B-lower aerofoil.

Embodiment

Referring to shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, is embodiments of the invention, and blade 2 is obtained according to the chord length (c) in table 1 and established angle (θ) structure by aerofoil profile 1.In table 1, the angle between the plane of rotation (xy face) of the chord length (c) that established angle (θ) is aerofoil profile 1 and blade 2.

Table 1

Exhibition is to position (mm)	Chord length c (mm)	Established angle θ (°)
			0-50	Blade root	0
50	44	17.20
			100	100	18.20
150	100	17.45
			200	77	13.3157
250	56	10.3242
			300	49	8.2272
350	45	6.6843
			400	41	5.5049
450	37	4.5759
			500	33	3.8259
550	29	3.2082

The top airfoil A coordinate of aerofoil profile 1 meets equation:

Y1=-0.6286*x^4+1.448*x^3-1.454*x^2+0.6346*x+1.274*10^ (-4) (I), the lower aerofoil B coordinate of aerofoil profile 1 meets equation:

y2＝0.4258*x^4-1.064*x^3+0.6204*x^2+0.01808*x-2.298*10^(-4)(Ⅱ)，

Wherein: 0≤x≤1, at 0≤x≤0.02 place, top airfoil A, lower aerofoil B seamlessly transit.

Aerofoil profile 1 lift coefficient is comparatively large, and ratio of lift coefficient to drag coefficient is comparatively large, and aeroperformance is more excellent.

Figure 7 shows that aerofoil profile 1 of the present invention is 100000 at reynolds' number, the lift coefficient correlation curve figure when angle of attack is 0 ~ 20 ° with standard aerofoil profile.As seen from the figure, the lift coefficient of this kind of operating mode Airfoil 1 is higher than standard aerofoil profile, and maximum lift coefficient is 1.7825 times of standard aerofoil profile.

Figure 8 shows that aerofoil profile 1 of the present invention is 100000 at reynolds' number, the ratio of lift coefficient to drag coefficient correlation curve figure when angle of attack is 0 ~ 20 ° with standard aerofoil profile.As seen from the figure, the ratio of lift coefficient to drag coefficient of this kind of operating mode Airfoil 1 is higher than standard aerofoil profile, and maximum lift-drag ratio is 1.7726 times of standard aerofoil profile.

Figure 9 shows that blade 2 of the present invention with rule blade when wind speed is 0 ~ 10.7m/s, power contrast's plotted curve that test obtains.As seen from the figure, under this kind of operating mode, blade 2 is compared with rule blade, and efficiency significantly improves, and average increase rate reaches 26.48%.

In sum, when reynolds' number is 100000, when the angle of attack is 0 ~ 20 °, the lift coefficient of aerofoil profile 1 of the present invention and ratio of lift coefficient to drag coefficient are all higher than standard aerofoil profile, and compared with rule blade, blade 2 efficiency of the present invention significantly improves, more abundant to the utilization of wind energy.

Claims (1)

1. a small-sized wind power generator blade, is characterized in that: described blade (2) is made up of aerofoil profile (1), and top airfoil (A) coordinate of described aerofoil profile (1) meets equation:

y1＝-0.6286*x^4+1.448*x^3-1.454*x^2+0.6346*x+1.274*10^(-4)(Ⅰ)；

Lower aerofoil (B) coordinate of described aerofoil profile (1) meets equation:

Y2=0.4258*x^4-1.064*x^3+0.6204*x^2+0.01808*x-2.298*10^ (-4) (II); Wherein: 0≤x≤1, at 0≤x≤0.02 place, top airfoil (A) and lower aerofoil (B) seamlessly transit;

Described aerofoil profile (1) meets following table in the exhibition of blade (2) difference to the chord length (c) on position and established angle (θ):

Exhibition is to position (mm) Chord length c (mm) Established angle θ (°) 0-50 Blade root 0 50 44 17.20 100 100 18.20 150 100 17.45 200 77 13.3157 250 56 10.3242 300 49 8.2272 350 45 6.6843 400 41 5.5049 450 37 4.5759 500 33 3.8259 550 29 3.2082