CN101749193A - High-efficient wind powered generator with start-up wind speed being set and blades thereof - Google Patents

Abstract

The invention discloses a high-efficient wind powered generator with start-up wind speed being set and a blade thereof. The wind powered generator comprises the blade, wherein the blade comprises a root part and a blade tip; the root part is arranged at one end of the blade for installation, and the blade tip is arranged at the other end of the blade; the installation angle of the blade near the root part is greater; and the chord length of the blade is increased near the area of the root part non-linearly. The wind powered generator can be started up with low wind speed on the premise that the generated power is not lost basically, thereby greatly improving the power generation efficiency.

Description

Can set the high-efficiency wind driven generator and the blade thereof that start wind speed

Technical field

The present invention relates to a kind of generator, relate in particular to a kind of high-efficiency wind driven generator and blade thereof that starts wind speed of setting.

Background technique

The design theory of the blade of wind-driven generator has many, and as shellfish theory, vortex theory, foline theory, momentum theory or the like now, these theories design for blade of wind-driven generator and entire machine design provides great help.

Coming from the theoretical now simplification windmill model of shellfish, is according to its theoretic optimum operating condition, does not consider the distribution and the influence of blade vortex, so itself and practice have bigger gap; Later stage Schmits and Glauert have taken into full account the circumferential eddy current behind eddy current and the wind wheel such as eddy current of middle vortex cordis, whirlpool, border and the blade tip of wind wheel, the Schmits and the Glauert that have produced based on eddy current and foline theory design a model, the further perfect design theory of blade; Wilson designs a model with Glauert and is the basis, has further studied the tip loss, ratio of lift coefficient to drag coefficient of blade influence and the performance of wind wheel under off-design behaviour to the blade optimum performance, has proposed designing a model of Wilson.In addition, also have many other aerodynamics experts also to study more correlation theory, to use maximum design method in the blade of wind-driven generator design be Schmits and Glauert model to industry at present.

More than various Blade Design models all be from blade performance optimum efficiency under rated wind speed how, set analysis and inference that blade is made under standard rotary course state, all do not consider factors such as starting wind speed, feasible all higher according to the blade startup wind speed of such model design in the market, be difficult for holding.In actual applications, blade under static state with motion state under, the external condition of its design is very different, and makes the blade of design exist to start problems such as wind speed height, efficient are low.

On January 21st, 2009, disclosed Chinese invention patent application disclosed a kind of blower fan structure of wind-driven generator for No. 200810120290.8, and described blower fan comprises wheel hub, pressing plate and blade.First through hole is set on the pressing plate, blade is provided with second through hole, wheel hub is provided with tapped hole, first screw passes first through hole respectively and second through hole cooperates with tapped hole, first through hole and second through hole are provided with the screw adjusting play, the inboard of wheel hub is provided with the blade jacking system, be used for blade jack-up, the existence of screw adjusting play, purpose is to make first screw still can pass pressing plate and vanes fixed respectively on wheel hub, to reach the purpose that the adjusting vane setting angle improves wind energy utilization.

Though above-mentioned patent application technology can be made adjustment in response to varying environment to the setting angle of blade, but, in case wind-driven generator installs, then can not adjust in the use the setting angle of blade, still can't satisfy not only to reach and start low generating efficiency of wind speed but also high requirement.

Summary of the invention

The technical problem that the present invention mainly solves provides a kind of high-efficiency wind driven generator and blade thereof that starts wind speed of setting, and can realize under the prerequisite of not losing generated output substantially that low wind speed starts, and significantly improves generating efficiency.

For solving the problems of the technologies described above, the technological scheme that the present invention adopts is: the blade that a kind of wind-driven generator is provided, described blade comprises the root that an end is used to install and the blade tip of the other end, the established angle of the contiguous root of described blade is bigger, and the chord length of described blade increases in the non-linear acceleration of contiguous root area.

Wherein, described chord length C _RsWith established angle θ _RsBe aerofoil profile chord length and the established angle of blade at the blade at radius r place, described Crs and θ rs are respectively:

C _rs＝C _r×k _crs

${\mathrm{\Θ}}_{\mathrm{rs}}={\mathrm{\θ}}_r\×k_{\mathrm{\θrs}}$

Wherein, $\mathrm{Cr}=\frac{16\mathrm{\π}\·r}{C_{L}B}{\mathrm{Sin}}^2\left(\frac{\mathrm{arccty}\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}{3}\right),$ $\mathrm{\θr}=\frac{2}{3}\mathrm{arccty}\left(\frac{r}{R}{\mathrm{\λ}}_o\right)-\mathrm{\α},$ $k_{\mathrm{crs}}=\frac{\mathrm{\π}-\frac{v_s}{\mathrm{\π}}}{2v_s^{{\left(\frac{r}{R}\right)}^a}},$ $k_{\mathrm{\θrs}}=\frac{\mathrm{\π}(\mathrm{\π}-\frac{v_s}{\mathrm{\π}})}{6v_s^{{\left(\frac{r}{R}\right)}^a}},$ Described Vs is predetermined startup air speed value, and scope is 1.2～3.2 meter per seconds, and described r is that blade pitch wind wheel centre distance is the value at r place, and described R is the design radial of blade, and described a is an accommodation coefficient.

Wherein, described chord length C _RsWith established angle θ _RsBe aerofoil profile chord length and the established angle of blade at the blade at radius r place, described C _RsAnd θ _RsBe respectively:

C _rs＝C _r×k _crs

${\mathrm{\Θ}}_{\mathrm{rs}}={\mathrm{\θ}}_r\×k_{\mathrm{\θrs}}$

Wherein, $\mathrm{Cr}=\frac{8\mathrm{\π}(1-k_2)}{(1+k_2)}\frac{1}{k_4\sqrt{{k_4}^2+1}}\frac{r}{{\mathrm{BC}}_L},$ θr＝arccotk ₄-α， $k_4=\frac{1+k_3}{1+k_2}\left(\frac{r}{R}{\mathrm{\λ}}_o\right),$ $k_3=\sqrt{1+\frac{1-{k_2}^2}{{\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}^2}},$ $k_2=\cos k_1\sqrt{{\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}^2+1},$ $k_1=\frac{1}{3}\arctan \left(\frac{r}{R}{\mathrm{\λ}}_o\right)+\frac{\mathrm{\π}}{3},$ $k_{\mathrm{crs}}=\frac{\mathrm{\π}-\frac{v_s}{\mathrm{\π}}}{2v_s^{{\left(\frac{r}{R}\right)}^a}},$ $k_{\mathrm{\θrs}}=\frac{\mathrm{\π}(\mathrm{\π}-\frac{v_s}{\mathrm{\π}})}{6v_s^{{\left(\frac{r}{R}\right)}^a}},$ Described Vs is predetermined startup air speed value, and scope is 1.2～3.2 meter per seconds, and described r is that blade pitch wind wheel centre distance is the value at r place, and described R is the design radial of blade, and described a is an accommodation coefficient.

Wherein, described accommodation coefficient a is 2,3,4,5 or 6, and the manufacture level of the numerical value of described a and generator and blade is inversely proportional to.

Wherein, described length of blade increases by 1%～15% than standard theory computational methods, and is inversely proportional to the startup wind speed.

Wherein, the blade tip place of described blade is provided with and connects slick and sly winglet.

Wherein, described winglet is the symmetrical airfoil structure, length is 5%～10% of Blade Design length, described winglet recedes from the windward side, the angle of inclination is 15 degree～60 degree, described winglet recedes along impeller plane of rotation down wind, and the angle of inclination is 8 degree～30 degree, and winglet is 1/4 of a winglet length with the radius that is connected of described blade tip.

For solving the problems of the technologies described above, another technical solution used in the present invention is: a kind of wind-driven generator is provided, comprise blade, described blade comprises the root that an end is used to install and the blade tip of the other end, the established angle of the contiguous root of described blade is bigger, and the chord length of described blade increases in the non-linear acceleration of contiguous root area.

Wherein, described chord length C _RsWith established angle θ _RsBe aerofoil profile chord length and the established angle of blade at the blade at radius r place, described Crs and θ rs are respectively:

C _rs＝C _r×k _crs

${\mathrm{\Θ}}_{\mathrm{rs}}={\mathrm{\θ}}_r\×k_{\mathrm{\θrs}}$

Wherein, $\mathrm{Cr}=\frac{16\mathrm{\π}\·r}{C_{L}B}{\mathrm{Sin}}^2\left(\frac{\mathrm{arccty}\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}{3}\right),$ $\mathrm{\θr}=\frac{2}{3}\mathrm{arccty}\left(\frac{r}{R}{\mathrm{\λ}}_o\right)-\mathrm{\α},$ $k_{\mathrm{crs}}=\frac{\mathrm{\π}-\frac{v_s}{\mathrm{\π}}}{2v_s^{{\left(\frac{r}{R}\right)}^a}},$ $k_{\mathrm{\θrs}}=\frac{\mathrm{\π}(\mathrm{\π}-\frac{v_s}{\mathrm{\π}})}{6v_s^{{\left(\frac{r}{R}\right)}^a}},$ Described Vs is predetermined startup air speed value, and scope is 1.2～3.2 meter per seconds, and described r is that blade pitch wind wheel centre distance is the value at r place, and described R is the design radial of blade, and described a is an accommodation coefficient.

Wherein, described chord length C _RsWith established angle θ _RsBe aerofoil profile chord length and the established angle of blade at the blade at radius r place, described C _RsAnd θ _RsBe respectively:

C _rs＝C _r×k _crs

${\mathrm{\Θ}}_{\mathrm{rs}}={\mathrm{\θ}}_r\×k_{\mathrm{\θrs}}$

Wherein, $\mathrm{Cr}=\frac{8\mathrm{\π}(1-k_2)}{(1+k_2)}\frac{1}{k_4\sqrt{{k_4}^2+1}}\frac{r}{{\mathrm{BC}}_L},$ θr＝arccotk ₄-α， $k_4=\frac{1+k_3}{1+k_2}\left(\frac{r}{R}{\mathrm{\λ}}_o\right),$ $k_3=\sqrt{1+\frac{1-{k_2}^2}{{\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}^2}},$ $k_2=\cos k_1\sqrt{{\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}^2+1},$ $k_1=\frac{1}{3}\arctan \left(\frac{r}{R}{\mathrm{\λ}}_o\right)+\frac{\mathrm{\π}}{3},$ $k_{\mathrm{crs}}=\frac{\mathrm{\π}-\frac{v_s}{\mathrm{\π}}}{2v_s^{{\left(\frac{r}{R}\right)}^a}},$ $k_{\mathrm{\θrs}}=\frac{\mathrm{\π}(\mathrm{\π}-\frac{v_s}{\mathrm{\π}})}{6v_s^{{\left(\frac{r}{R}\right)}^a}},$ Described Vs is predetermined startup air speed value, and scope is 1.2～3.2 meter per seconds, and described r is that blade pitch wind wheel centre distance is the value at r place, and described R is the design radial of blade, and described a is an accommodation coefficient.

The invention has the beneficial effects as follows: be different from prior art and can't satisfy and not only reach the situation that starts low generating efficiency of wind speed but also high requirement, the present invention is through long-term theory analysis and experiment repeatedly, on Schmits that standard theory particularly uses morely and Glauert model based, introduce parameters such as starting wind speed, former computation model is revised, solved and decided the Blade Design and startup wind speed relevant theory and practice of slurry apart from wind-driven generator, can be in the larger context, according to the needs that start wind speed, design and the relevant blade of startup wind speed, and generated output is not lost or lost less to prior art substantially relatively, greatly satisfied the demand in the industry, to the development of wind-power electricity generation machine technology play a part one bigger.The experiment proved that start air speed value and can be low to moderate 1.2～3.2 meter per seconds, promptly under the wind condition that the prior art wind-driven generator can't start, the present invention can start and generate electricity smoothly, significantly improves generating efficiency.

Description of drawings

Fig. 1 is blade embodiment's one an of the present invention front schematic view;

Fig. 2 is the prior art blade at root section and blade of the present invention contrast schematic representation at root section;

Fig. 3 is blade embodiment's two an of the present invention schematic perspective view;

Fig. 4 is another schematic perspective view of blade embodiment two of the present invention.

Embodiment

By describing technology contents of the present invention, structure characteristics in detail, realized purpose and effect, give explanation below in conjunction with mode of execution and conjunction with figs. are detailed.

For system solves the prior art problem, the inventor is by long-term theory analysis and experiment repeatedly, on Schmits that uses morely and Glauert model based, introduce parameters such as starting wind speed, former computation model is revised, obtained blade embodiment as Fig. 1 and wind-driven generator of the present invention shown in Figure 2.

Consult Fig. 1 and Fig. 2, described blade 10 comprises the root 11 that an end is used to install and the blade tip 12 of the other end, the established angle θ of described blade 10 contiguous roots 11 _RsBigger, the also i.e. established angle θ in the zone 13 among the figure _RsBig than other zones, and the chord length C of described blade 10 _RsIncrease in contiguous root 11 regional non-linear acceleration, also the i.e. chord length C in the zone 13 among the figure _RsNon-linear acceleration increases, and forms the structure that is similar to projection.10 ' is existing blade, its chord length C among Fig. 2 _Rs' and established angle θ _Rs' to compare the present invention at contiguous root 11 places all obviously less.

Established angle θ at blade 10 contiguous roots 11 _RsThan big and chord length C _RsIncrease in contiguous root 11 regional non-linear acceleration, can increase the windward side, the moment that on blade 10, produces when improving fluid through blade 10, it is less not influence the loss of whole generating power or generated output simultaneously again when generating substantially.

Being different from prior art can't satisfy and not only reach the situation that starts low generating efficiency of wind speed but also high requirement, the present invention is through long-term theory analysis and experiment repeatedly, on Schmits that standard theory particularly uses morely and Glauert model based, introduce parameters such as starting wind speed, former computation model is revised, solved and decided the Blade Design and startup wind speed relevant theory and practice of slurry apart from wind-driven generator, can be in the larger context, according to the needs that start wind speed, design and the relevant blade of startup wind speed, and generated output is not lost or lost less to prior art substantially relatively, greatly satisfied the demand in the industry, to the development of wind-power electricity generation machine technology play a part one bigger.

Wherein, the shape that described non-linear acceleration increase can be a projection also can be the shape that monolateral non-linear acceleration increases.

In another embodiment, described chord length C _RsWith established angle θ _RsBe aerofoil profile chord length and the established angle of blade 10 at the blade 10 at radius r place, described C _RsAnd θ _RsBe respectively:

C _rs＝C _r×k _crs

${\mathrm{\Θ}}_{\mathrm{rs}}={\mathrm{\θ}}_r\×k_{\mathrm{\θrs}}$

Wherein, $\mathrm{Cr}=\frac{16\mathrm{\π}\·r}{C_{L}B}{\mathrm{Sin}}^2\left(\frac{\mathrm{arccty}\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}{3}\right),$ $\mathrm{\θr}=\frac{2}{3}\mathrm{arccty}\left(\frac{r}{R}{\mathrm{\λ}}_o\right)-\mathrm{\α},$ $k_{\mathrm{crs}}=\frac{\mathrm{\π}-\frac{v_s}{\mathrm{\π}}}{2v_s^{{\left(\frac{r}{R}\right)}^a}},$ $k_{\mathrm{\θrs}}=\frac{\mathrm{\π}(\mathrm{\π}-\frac{v_s}{\mathrm{\π}})}{6v_s^{{\left(\frac{r}{R}\right)}^a}},$ Described Vs is predetermined startup air speed value, and scope is 1.2～3.2 meter per seconds, and described r is that blade 10 is the value at r place apart from wind wheel centre distance, and described R is the design radial of blade 10, and described a is an accommodation coefficient.

The experiment proved that start air speed value and can be low to moderate 1.2～3.2 meter per seconds, promptly under the wind condition that the prior art wind-driven generator can't start, the present invention can start and generate electricity smoothly, significantly improves generating efficiency.

Above-mentioned design method, revised theory and formula can be revised on Schmits and Glauert computation model basis (Schmits and Glauert computation model are attached as follows).Described Schmits and Glauert computation model are meant the chord length C of blade 10 _rWith established angle θ _rParameter.Described chord length C _rWith established angle θ _rBe chord length and the established angle of blade 10 in the aerofoil profile of the blade 10 at radius r place.Described revised theory and formula are meant through what obtain after deriving, analyze and testing and are aided with correction factor k on the bases of Schmits and Glauert computation model _Cs,

After the chord length C of the blade 10 that obtains _RsWith established angle θ _RsDescribed chord length C _RsWith established angle θ _RsBe through chord length and the established angle of revised blade 10 in the aerofoil profile of the blade 10 at radius r place.

Therein among embodiment, described chord length C _RsWith established angle θ _RsBe aerofoil profile chord length and the established angle of blade 10 at the blade 10 at radius r place, described C _RsAnd θ _RsBe respectively:

C _rs＝C _r×k _crs

${\mathrm{\Θ}}_{\mathrm{rs}}={\mathrm{\θ}}_r\×k_{\mathrm{\θrs}}$

Wherein, $\mathrm{Cr}=\frac{8\mathrm{\π}(1-k_2)}{(1+k_2)}\frac{1}{k_4\sqrt{{k_4}^2+1}}\frac{r}{{\mathrm{BC}}_L},$ θr＝arccotk ₄-α， $k_4=\frac{1+k_3}{1+k_2}\left(\frac{r}{R}{\mathrm{\λ}}_o\right),$ $k_3=\sqrt{1+\frac{1-{k_2}^2}{{\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}^2}},$ $k_2=\cos k_1\sqrt{{\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}^2+1},$ $k_1=\frac{1}{3}\arctan \left(\frac{r}{R}{\mathrm{\λ}}_o\right)+\frac{\mathrm{\π}}{3},$ $k_{\mathrm{crs}}=\frac{\mathrm{\π}-\frac{v_s}{\mathrm{\π}}}{2v_s^{{\left(\frac{r}{R}\right)}^a}},$ $k_{\mathrm{\θrs}}=\frac{\mathrm{\π}(\mathrm{\π}-\frac{v_s}{\mathrm{\π}})}{6v_s^{{\left(\frac{r}{R}\right)}^a}},$ Described Vs is predetermined startup air speed value, and scope is 1.2～3.2 meter per seconds, and described r is that blade 10 is the value at r place apart from wind wheel centre distance, and described R is the design radial of blade 10, and described a is an accommodation coefficient.

Wherein, work as k _CrsMore than or equal to 1 o'clock, revised chord length C _RsEqual correction factor k _CrsWith chord length C _rProduct; As correction factor k _CrsBe 1 positive and negative 10% o'clock, revised chord length C _RsCan equal chord length C _rThe blade 10 chord length C that after revising, calculate _RsWith established angle θ _RsAnd revise in the reasonable spreading range of computation model, for the result of calculation of existing design modification theory and computation model is respectively extended in 10% numerical value up and down, but still the existing design modification theory of blade 10 and the basic thought and the thinking of computation model have been used.

The experiment proved that start air speed value and can be low to moderate 1.2～3.2 meter per seconds, promptly under the wind condition that the prior art wind-driven generator can't start, the present invention can start and generate electricity smoothly, significantly improves generating efficiency.

The described accommodation coefficient a of the various embodiments described above is 2,3,4,5 or 6, and the manufacture level of the numerical value of described a and generator and blade 10 is inversely proportional to.Be that level is high more, coefficient can be more little; Otherwise then should get higher value.

Be the better generating efficiency that improves generator, described blade 10 length increase by 1%～15% than standard theory computational methods, and are inversely proportional to the startup wind speed.It is low more promptly to start the wind speed requirement, and the numerical value of increase will be big more.Through after the increase of length, because correction factor k _CrsWith

May influence and the generated output of possible loss can remedy fully, even increase to some extent.

Consult Fig. 3 and Fig. 4, in other embodiment, blade tip 12 places of described blade 10 are provided with and connect slick and sly winglet 14.Described winglet 14 is the symmetrical airfoil structure, length is 5%～10% of blade 10 design lengths, described winglet 14 recedes from the windward side, the angle of inclination is 15 degree～60 degree, described winglet 14 recedes along impeller plane of rotation down wind, the angle of inclination is 8 degree～30 degree, and winglet 14 is 1/4 of a winglet length with the radius that is connected of described blade tip 12.In certain embodiments, can in whole blades 10 length, be arranged to rare plural aerofoil profile.Also consult Fig. 1 to Fig. 4, the present invention also provides a kind of wind-driven generator according to above theory and design, comprise blade 10, described blade 10 comprises the root 11 that an end is used to install and the blade tip 12 of the other end, the established angle of described blade 10 contiguous roots 11 is bigger, and the chord length of described blade 10 increases in contiguous root 11 regional non-linear acceleration.

Wherein, described chord length C _RsWith established angle θ _RsBe aerofoil profile chord length and the established angle of blade 10 at the blade 10 at radius r place, described C _RsAnd θ _RsBe respectively:

C _rs＝C _r×k _crs

${\mathrm{\Θ}}_{\mathrm{rs}}={\mathrm{\θ}}_r\×k_{\mathrm{\θrs}}$

Wherein, $\mathrm{Cr}=\frac{16\mathrm{\π}\·r}{C_{L}B}{\mathrm{Sin}}^2\left(\frac{\mathrm{arccty}\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}{3}\right),$ $\mathrm{\θr}=\frac{2}{3}\mathrm{arccty}\left(\frac{r}{R}{\mathrm{\λ}}_o\right)-\mathrm{\α},$ $k_{\mathrm{crs}}=\frac{\mathrm{\π}-\frac{v_s}{\mathrm{\π}}}{2v_s^{{\left(\frac{r}{R}\right)}^a}},$ $k_{\mathrm{\θrs}}=\frac{\mathrm{\π}(\mathrm{\π}-\frac{v_s}{\mathrm{\π}})}{6v_s^{{\left(\frac{r}{R}\right)}^a}},$ Described Vs is predetermined startup air speed value, and scope is 1.2～3.2 meter per seconds, and described r is that blade 10 is the value at r place apart from wind wheel centre distance, and described R is the design radial of blade 10, and described a is an accommodation coefficient.

Described chord length C _RsWith established angle θ _RsBe aerofoil profile chord length and the established angle of blade 10 at the blade 10 at radius r place, described C _RsAnd θ _RsBe respectively:

C _rs＝C _r×k _crs

${\mathrm{\Θ}}_{\mathrm{rs}}={\mathrm{\θ}}_r\×k_{\mathrm{\θrs}}$

Wherein, $\mathrm{Cr}=\frac{8\mathrm{\π}(1-k_2)}{(1+k_2)}\frac{1}{k_4\sqrt{{k_4}^2+1}}\frac{r}{{\mathrm{BC}}_L},$ θr＝arccotk ₄-α， $k_4=\frac{1+k_3}{1+k_2}\left(\frac{r}{R}{\mathrm{\λ}}_o\right),$ $k_3=\sqrt{1+\frac{1-{k_2}^2}{{\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}^2}},$ $k_2=\cos k_1\sqrt{{\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}^2+1},$ $k_1=\frac{1}{3}\arctan \left(\frac{r}{R}{\mathrm{\λ}}_o\right)+\frac{\mathrm{\π}}{3},$ $k_{\mathrm{crs}}=\frac{\mathrm{\π}-\frac{v_s}{\mathrm{\π}}}{2v_s^{{\left(\frac{r}{R}\right)}^a}},$ $k_{\mathrm{\θrs}}=\frac{\mathrm{\π}(\mathrm{\π}-\frac{v_s}{\mathrm{\π}})}{6v_s^{{\left(\frac{r}{R}\right)}^a}},$ Described Vs is predetermined startup air speed value, and scope is 1.2～3.2 meter per seconds, and described r is that blade 10 is the value at r place apart from wind wheel centre distance, and described R is the design radial of blade 10, and described a is an accommodation coefficient.

According to the present invention, in an example, be that design object and the computation model of thinking Schmitz are that example is done an explanation with 2 kilowatts wind-driven generators:

The major parameter of its design is:

Rated power: 2000 watts

Rated wind speed: 12 meter per seconds

Rated speed: 480 rev/mins

Theoretical calculation rotor diameter: 2.9 meters

Start wind speed: 2 meter per seconds

Accommodation coefficient: 4

Consider air guide sleeve and start Influences on Wind Velocity, rotor diameter is modified to 3.2 meters.

Simultaneously before radius ratio is 0.75 place,

C _rs＝C _r×k _crs

${\mathrm{\Θ}}_{\mathrm{rs}}={\mathrm{\θ}}_r\×k_{\mathrm{\θrs}}$

Radius ratio is taked θ after being 0.75 place _Rs=θ _r

C _rs＝C _r

According to above major parameter, it is as follows that it calculates comparing result:

Table one: blade angle of prior art and one embodiment of the invention and chord length contrast

With radius ratio be the cross section at 0.2 place as example, as follows with blade 10 cross-sectional datas and the sectional drawing of the Airfoil Design of NACA4415:

Table two: blade cross-sectional data contrast in the Airfoil Design of prior art and one embodiment of the invention

Among the present invention, correction factor k _CrsWith

Correction design with comprise but be not limited only to that aerofoil profile changes, the lift coefficient of aerofoil profile or aerodynamic parameters such as resistance coefficient, tip-speed ratio are irrelevant, therefore have extraordinary applicability and simplicity.

The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.

Claims (10)

1. the blade of a wind-driven generator is characterized in that, described blade comprises the root that an end is used to install and the blade tip of the other end, and the established angle of the contiguous root of described blade is bigger, and the chord length of described blade increases in the non-linear acceleration of contiguous root area.

2. the blade of wind-driven generator according to claim 1 is characterized in that: described chord length C _RsWith established angle θ _RsBe aerofoil profile chord length and the established angle of blade at the blade at radius r place, described Crs and θ rs are respectively:

C _rs＝C _r×k _crs

Θ _rs＝θ _r×k _θrs

Wherein, $\mathrm{Cr}=\frac{16\mathrm{\π}\·r}{C_{L}B}{\sin }^2\left(\frac{\mathrm{arccty}\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}{3}\right),$ $\mathrm{\θr}=\frac{2}{3}\mathrm{arccty}\left(\frac{r}{R}{\mathrm{\λ}}_o\right)-\mathrm{\α},$ $k_{\mathrm{crs}}=\frac{\mathrm{\π}-\frac{v_s}{\mathrm{\π}}}{2v_s^{{\left(\frac{r}{R}\right)}^a}},$ $k_{\mathrm{\θrs}}=\frac{\mathrm{\π}(\mathrm{\π}-\frac{v_s}{\mathrm{\π}})}{6v_s^{{\left(\frac{r}{R}\right)}^a}},$ Described Vs is predetermined startup air speed value, and scope is 1.2～3.2 meter per seconds, and described r is that blade pitch wind wheel centre distance is the value at r place, and described R is the design radial of blade, and described a is an accommodation coefficient.

3. the blade of wind-driven generator according to claim 1 is characterized in that: described chord length C _RsWith established angle θ _RsBe aerofoil profile chord length and the established angle of blade at the blade at radius r place, described C _RsAnd θ _RsBe respectively:

C _rs＝C _r×k _crs

Θ _rs＝θ _r×k _θrs

Wherein, $\mathrm{Cr}=\frac{8\mathrm{\π}(1-k_2)}{(1+k_2)}\frac{1}{k_4\sqrt{{k_4}^2+1}}\frac{r}{{\mathrm{BC}}_L},$ θ _r＝arccotk ₄-α， $k_4=\frac{1+k_3}{1+k_2}\left(\frac{r}{R}{\mathrm{\λ}}_o\right),$ $k_3=\sqrt{1+\frac{1-{k_2}^2}{{\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}^2}},$ $k_2=\cos k_1\sqrt{{\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}^2+1},$ $k_1=\frac{1}{3}\arctan \left(\frac{r}{R}{\mathrm{\λ}}_o\right)+\frac{\mathrm{\π}}{3},$ $k_{\mathrm{crs}}=\frac{\mathrm{\π}-\frac{v_s}{\mathrm{\π}}}{2v_s^{{\left(\frac{r}{R}\right)}^a}},$ $k_{\mathrm{\θrs}}=\frac{\mathrm{\π}(\mathrm{\π}-\frac{v_s}{\mathrm{\π}})}{6v_s^{{\left(\frac{r}{R}\right)}^a}},$ Described Vs is predetermined startup air speed value, and scope is 1.2～3.2 meter per seconds, and described r is that blade pitch wind wheel centre distance is the value at r place, and described R is the design radial of blade, and described a is an accommodation coefficient.

4. according to the blade of claim 2 or 3 described wind-driven generators, it is characterized in that: described accommodation coefficient a is 2,3,4,5 or 6, and the manufacture level of the numerical value of described a and generator and blade is inversely proportional to.

5. according to the blade of claim 2 or 3 described wind-driven generators, it is characterized in that: described length of blade increases by 1%～15% than standard theory computational methods, and is inversely proportional to the startup wind speed.

6. according to the blade of claim 2 or 3 described wind-driven generators, it is characterized in that: the blade tip place of described blade is provided with and connects slick and sly winglet.

7. according to the blade of claim 2 or 3 described wind-driven generators, it is characterized in that: described winglet is the symmetrical airfoil structure, length is 5%～10% of Blade Design length, described winglet recedes from the windward side, the angle of inclination is 15 degree～60 degree, described winglet recedes along impeller plane of rotation down wind, and the angle of inclination is 8 degree～30 degree, and winglet is 1/4 of a winglet length with the radius that is connected of described blade tip.

8. a wind-driven generator comprises blade, it is characterized in that, described blade comprises the root that an end is used to install and the blade tip of the other end, and the established angle of the contiguous root of described blade is bigger, and the chord length of described blade increases in the non-linear acceleration of contiguous root area.

9. wind-driven generator according to claim 8 is characterized in that: described chord length C _RsWith established angle θ _RsBe aerofoil profile chord length and the established angle of blade at the blade at radius r place, described Crs and θ rs are respectively:

C _rs＝C _r×k _crs

Θ _rs＝θ _r×k _θrs

Wherein, $\mathrm{Cr}=\frac{16\mathrm{\π}\·r}{C_{L}B}{\sin }^2\left(\frac{\mathrm{arccty}\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}{3}\right),$ $\mathrm{\θr}=\frac{2}{3}\mathrm{arccty}\left(\frac{r}{R}{\mathrm{\λ}}_o\right)-\mathrm{\α},$ $k_{\mathrm{crs}}=\frac{\mathrm{\π}-\frac{v_s}{\mathrm{\π}}}{2v_s^{{\left(\frac{r}{R}\right)}^a}},$ $k_{\mathrm{\θrs}}=\frac{\mathrm{\π}(\mathrm{\π}-\frac{v_s}{\mathrm{\π}})}{6v_s^{{\left(\frac{r}{R}\right)}^a}},$ Described Vs is predetermined startup air speed value, and scope is 1.2～3.2 meter per seconds, and described r is that blade pitch wind wheel centre distance is the value at r place, and described R is the design radial of blade, and described a is an accommodation coefficient.

10. wind-driven generator according to claim 8 is characterized in that: described chord length C _RsWith established angle θ _RsBe aerofoil profile chord length and the established angle of blade at the blade at radius r place, described C _RsAnd θ _RsBe respectively:

C _rs＝C _r×k _crs

Θ _rs＝θ _r×k _θrs

Wherein, $\mathrm{Cr}=\frac{8\mathrm{\π}(1-k_2)}{(1+k_2)}\frac{1}{k_4\sqrt{{k_4}^2+1}}\frac{r}{{\mathrm{BC}}_L},$ θr＝arccotk ₄-α， $k_4=\frac{1+k_3}{1+k_2}\left(\frac{r}{R}{\mathrm{\λ}}_o\right),$ $k_3=\sqrt{1+\frac{1-{k_2}^2}{{\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}^2}},$ $k_2=\cos k_1\sqrt{{\left(\frac{r}{R}{\mathrm{\λ}}_o\right)}^2+1},$ $k_1=\frac{1}{3}\arctan \left(\frac{r}{R}{\mathrm{\λ}}_o\right)+\frac{\mathrm{\π}}{3},$ $k_{\mathrm{crs}}=\frac{\mathrm{\π}-\frac{v_s}{\mathrm{\π}}}{2v_s^{{\left(\frac{r}{R}\right)}^a}},$ $k_{\mathrm{\θrs}}=\frac{\mathrm{\π}(\mathrm{\π}-\frac{v_s}{\mathrm{\π}})}{6v_s^{{\left(\frac{r}{R}\right)}^a}},$ Described Vs is predetermined startup air speed value, and scope is 1.2～3.2 meter per seconds, and described r is that blade pitch wind wheel centre distance is the value at r place, and described R is the design radial of blade, and described a is an accommodation coefficient.

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