CN102720643B - Self-adapting wind blade for wind power generation - Google Patents
Self-adapting wind blade for wind power generation Download PDFInfo
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- CN102720643B CN102720643B CN2012100889577A CN201210088957A CN102720643B CN 102720643 B CN102720643 B CN 102720643B CN 2012100889577 A CN2012100889577 A CN 2012100889577A CN 201210088957 A CN201210088957 A CN 201210088957A CN 102720643 B CN102720643 B CN 102720643B
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Abstract
The invention discloses a self-adapting wind blade for wind power generation, belonging to the technical field of wind power generation. The self-adapting wind blade provided in the invention is composed of a hard wind blade and a flexible bat skirt blade, wherein the bat skirt blade is connected to rear edge of the hard wind blade. Through verification of a contrast wind-blowing experiment, output power of the wind blade in the invention is comprehensively increased compared with a model machine, wherein the less the wind speed is the greater the increasing amplitude is. With the same diameter, blade amount and wind speed, when the model machine (Guangzhou Ceagar AN-FD400W)is replaced with the bat skirt wind blades, the power of the machine is increased by the following percentages: increased by 80% with light breeze (3.3m/s) which reduces power generation cost by 44%; increased by 32% with gentle breeze (i.e. gentle wind 5.4m/s); and increased by 18% with moderate breeze (7.9m/s). Experimental data can be well documented. And the data is an initial result which can be further improved to reach a limit level 59.3% of a wind energy utilization coefficient.
Description
Technical field
The invention belongs to technical field of wind power generation, relate to the correlative technology fields such as aviation, ship propeller, be specifically related to a kind of wind-power electricity generation self adaption fan blade.
Background technique
Use not only befouling environment but also soon exhausted of coal and petroleum-based energy; Wind energy is the green energy resource that forever can freely use that nature is vouchsafed.Generally believe that at present wind-power electricity generation is best alternative green energy resource, but also exist cost high, generate electricity that required mean wind velocity is large, wind field is difficult looks for, is difficult to the problem that large-scale popularization is used.Therefore need research and develop at present improve generating efficiency, improve the blower fan power coefficient, reduce the cost of wind-power electricity generation and reduce the generating mean wind velocity, can be at the little wind wind-driven generator that region is used widely.
The shortcoming of existing wind-driven generator is: " little wind " does not turn; " apoplexy " generates not how many electricity (wind energy and wind speed cube are directly proportional); " strong wind " is rarely found; Even installation rated power (corresponding wind speed 13-14 meter per second, strong breeze) is very large, but annual electricity generating capacity is very little; Annual electricity generating capacity is closely related with annual mean wind speed, and national most area annual mean wind speed is less than standard wind field wind speed 6 meter per seconds.Existing rigidity fan blade wind driven generator, reducing starting wind velocity is conflict with increasing power coefficient, you can't have both at the same time.Little blower fan is in order to reduce starting wind velocity, and power coefficient in but having lost, during strong wind, lost the strong wind energy.High-power blower fan blade torsion angle is by wind speed 8 meter per second designs, and now power coefficient is larger, has but lost little wind power coefficient, and efficiency is lower.Although high-power blower adopts the large square method of the whole change of fan blade to reduce starting wind velocity, just idle running, due to airflow direction and the serious off resonance of fan blade torsion angle, the incision wind speed just generated electricity is still larger, has wasted little wind wind energy.And the frequency that in reality, annual little wind occurs is very high, accumulated energy is very large.
Beijing approximately has 3-4 days an every year scrapes strong breeze (10.8-13.8 meter per second), and it is very little that the accumulative total hour number accounts for annual total hour number ratio.Beijing, the about 2.1-2.3 meter per second of Guangzhou annual mean wind speed.Existing fan design point is 8 meter per seconds, does not meet Chinese practice.With the fan blade of the present invention research and development with existingly exchange with the diameter impeller of blower, through having realized with the model machine contrast test: starting, incision wind speed are little; Power coefficient improves comprehensively, and the less increase of wind speed is more, has improved annual electricity generating capacity, has reduced cost of electricity-generating.
The document [1] that sees reference, " wind energy conversion system aerodynamics " (second edition), China Electric Power Publishing House, in June, 2009 Beijing first impression, provide the physical connotation of axial inducible factor α in literary composition.
The patent application that application for a patent for invention number is 200810105693.5, disclose a kind of self-adapting wind wheel for wind power generation, and the present invention is on this basis through the model machine research and development, and the performance comparison test, obtain good effect.
Summary of the invention
The present invention is directed to the problem existed in existing blower fan technology, a kind of wind-power electricity generation self adaption (bat skirt) fan blade is provided, be mainly used in wind power plant, improve wind power generation efficiency, reduce the blower fan cost of electricity-generating.
Technological scheme of the present invention is as follows:
Self adaption fan blade provided by the invention is comprised of hard fan blade and flexible bat skirt two-part, and wherein, flexible bat skirt is connected to the rear along upper of hard fan blade.Hard fan blade is partly rigidity, and optimal design the aerofoil profile of hard fan blade, for bearing curved power, keeping air foil shape etc.; The rear edge of hard fan blade connects the bat skirt, and the bat skirt is flexible, can effectively improve power coefficient.
Fan blade provided by the invention is through contrast blowing verification experimental verification, and output power is than the comprehensive improve of model machine, and the less increase rate of wind speed is larger.Under diameter, the number of blade, wind speed the same terms, after model machine (the good AN-FD400W of Guangzhou generation) is changed bat skirt fan blade of the present invention, it is as follows that power improves percentage: be 80% below light breeze (3.3 meter per second), reduce cost of electricity-generating 44%; Be 32% below force 3 wind (gentle breeze 5.4 meter per seconds), reduce cost of electricity-generating 24%; Moderate breeze following (7.9 meter per second) is 18%, reduces cost of electricity-generating 15%, all has test data to look into.This fan blade takes full advantage of the little wind that often has and the wind of medium wind speed, and the strong wind efficiency that falls in also is improved; Annual electricity generating capacity is large, and cost of electricity-generating significantly reduces; The use region is wide, is convenient to large-scale popularization and uses.
The accompanying drawing explanation
Following accompanying drawing is the embodiment accompanying drawing, only for the present invention's examples of implementation are described, but be not used in, limits technological scheme of the present invention:
The plan view of the example that Fig. 1 is wind-power electricity generation self adaption fan blade provided by the invention and the schematic diagram of side view;
The three-dimensional profile schematic diagram of hard fan blade part of the example that Fig. 2 is wind-power electricity generation self adaption fan blade provided by the invention;
The hard fan blade of the example that Fig. 3 is wind-power electricity generation self adaption fan blade provided by the invention is by the aerofoil profile schematic diagram in four cross sections of blade root;
The hard fan blade of the example that Fig. 4 is wind-power electricity generation self adaption fan blade provided by the invention is by the aerofoil profile schematic diagram in four cross sections of blade tip.
In figure:
1. blade tip; 2. blade root; 3. groove; 4. rear edge; 5. windward side; 6. lee face.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in detail.
The invention provides a kind of wind-power electricity generation self adaption fan blade and design method thereof, as shown in Figure 1, wind-power electricity generation self adaption fan blade provided by the invention, be comprised of hard fan blade and flexible bat skirt two-part, and wherein, flexible bat skirt is connected to the rear along on 4 of hard fan blade.The bat skirt with the annexation between hard fan blade can be: after hard fan blade rear pushed down the bat skirt along 4 by pressing plate, with screw, be connected, perhaps directly that the rear edge of hard fan blade is bonding with the bat skirt, perhaps the bat skirt is inserted after hard fan blade along in 4 windward side 5 and the seam between lee face 6, then screw connects or is bonding.Hard fan blade as shown in Figure 2, be to adopt solid construction for little blower fan, by the casting mode, manufactures, and large blower fan can adopt hollow structure, with weight reduction.The left side of the aerofoil profile of the hard fan blade shown in 3 is windward side 5 by reference to the accompanying drawings, consists of round and smooth connection between two sections circular arcs two sections circular arcs.Right side lee face 6 also is comprised of two sections circular arcs, between two sections circular arcs, is also round and smooth connection.Three schematic cross-sections that airfoil structure is the root of the hard fan blade in Fig. 2 in left side in Fig. 3, be provided with the groove 3 of the degree of depth 1～5mm at hard fan blade root, length account for whole blade length 30～100%, groove 3 structures are for connecting the bat skirt, be that described flexible bat skirt can be along 4 after hard fan blade root, also can hard fan blade all after along 4 settings.Described bat skirt only is connected to the windward side 5 of hard fan blade.In Fig. 3, the 4th cross section is hard fan blade cross section (aerofoil profile) schematic diagram that there is no groove location.As shown in Figure 4, the fan blade cross section from left to right section area dwindle gradually.
As shown in Figure 1, in Fig. 1, left side be fan blade blade root 2 to described bat skirt structure, and right side is blade tip 1, downside be after fan blade along 4, bat skirt integral body is the triangular-arc shape, the bat skirt is narrow near the part of blade tip 1, the part of close blade root 2 is wide.Bat skirt width (from fan blade along to edge under the bat skirt, or in accompanying drawing 1 from hard fan blade downside to the bat skirt bottom) be 1～4.5 times of blade tip aerofoil profile chord length.The radius of arc of two sections arc-shaped edges of bat skirt is respectively: the bat skirt width that the radius of one section arc-shaped edges of close blade tip 1 is 3～6.5 times.Near blade root 2 partial arc radiuses, for take blade rotation center of circle O, be the center of circle, radius is 20～35% of hard fan blade length.
Described flexible bat skirt can be made with spring steel plate, aluminum alloy sheet, PC sheet and other flexible platelets.Hard fan blade is partly rigidity, and optimal design the aerofoil profile of hard fan blade, for bearing curved power, keeping air foil shape etc.; The rear edge of hard fan blade connects the bat skirt, and the bat skirt is flexible, can effectively improve power coefficient.
The design method of the above-mentioned wind-power electricity generation self adaption fan blade provided comprises the steps:
The first step, first determine that blower fan is just to mains supply or to the voltage of storage battery charging, then determine the incision rotational speed N of wind wheel power supply; Described wind wheel refers to the rotating mechanism that comprises self adaption fan blade of the present invention and wheel hub composition.
Second step, according to the incision rotational speed N in the first step, determine that self adaption fan blade different radii place tangential velocity compares λ with wind speed
i, i is natural number, i>=8;
The 3rd step, the tangential velocity in second step compares λ with wind speed
idetermine blade different radii place air-flow flow inlet angle
Wherein, i is natural number, i >=8, and a is the axial inducible factor of wind speed; A=0～0.333, concrete numerical value, by the factors such as the efficiency decision of fan blade Airfoil Design, smooth surface degree, bat skirt.
The 4th step, by the gentle air horn that flows to of air-flow angle of attack
calculate fan blade torsion angle Q
i:
Described air-flow angle of attack is empirical value, the general air-flow angle of attack that first definite blower fan has just started generating, and span is in 0～7 degree scope; I is natural number, i >=8.
The 5th step, determining of the length of flexible bat skirt, width, thickness, material, swing and be advisable slightly backward during with starting wind velocity.The most handy blowing verification experimental verification power coefficient Cp value.
Described incision rotating speed refers to that blower fan has just started the rotating speed of generating.
Self adaption provided by the invention (bat skirt) fan blade is changed the outfit on AN-FD400W, power coefficient Cp improves a lot, also can further improve through further Optimum Experiment, progressively approach power coefficient Cp limiting value 59.3%, approach the efficiency of batswing tab.During the design method of this invention can be applied in fully, in the large fan research and development.The principle of the invention also can be used on aircraft and boats and ships associated fluid part design.
Claims (6)
1. wind-power electricity generation self adaption fan blade, it is characterized in that: hard fan blade and flexible bat skirt two-part, consist of, wherein, flexible bat skirt is connected to the rear along upper of hard fan blade; Be provided with groove at hard fan blade root, the degree of depth of groove is 1～5mm, and groove length accounts for 30～100% of whole hard fan blade length, and groove structure is for connecting the bat skirt; Described bat skirt is connected to the windward side of hard fan blade; Described bat skirt integral body is the triangular-arc shape, and the bat skirt is narrow near the part of wing tip, and wide near the part of wing root, bat skirt width is 1～4.5 times of blade tip wing chord length; The radius of arc of two sections arc-shaped edges of bat skirt is respectively: the bat skirt width that the radius of one section arc-shaped edges of close wing tip is 3～6.5 times; Near wing root partial arc radius, for take the blade rotation center of circle as the center of circle, radius is 20～35% of hard fan blade length.
2. wind-power electricity generation self adaption fan blade according to claim 1, it is characterized in that: the bat skirt is first pressing plate to be pushed down to the bat skirt with screw, to be connected along rear at hard the rear of fan blade with the annexation between hard fan blade, perhaps directly that the rear edge of hard fan blade is bonding with the bat skirt, perhaps the bat skirt is inserted in the windward side and the seam between lee face on edge after hard fan blade, then screw connects or is bonding.
3. wind-power electricity generation self adaption fan blade according to claim 1, is characterized in that: described hard fan blade employing solid construction or hollow structure.
4. wind-power electricity generation self adaption fan blade according to claim 1, it is characterized in that: the windward side of the aerofoil profile of described hard fan blade and lee face are comprised of two sections circular arcs respectively, round and smooth connection respectively between two sections circular arcs.
5. wind-power electricity generation self adaption fan blade according to claim 1 is characterized in that: described flexible bat for skirt spring steel plate, aluminum alloy sheet or PC sheet make.
6. the design method of wind-power electricity generation self adaption fan blade claimed in claim 1 is characterized in that following steps:
The first step, first determine that blower fan is just to mains supply or to the voltage of storage battery charging, then determine the incision rotational speed N of wind wheel power supply;
Second step, according to the incision rotational speed N in the first step, determine that self adaption fan blade different radii place tangential velocity compares λ with wind speed
i, i is natural number, i>=8;
The 3rd step, the tangential velocity in second step compares λ with wind speed
idetermine blade different radii place air-flow flow inlet angle
Wherein, i is natural number, i >=8, and a is the axial inducible factor of wind speed; A=0～0.333;
The 4th step, by the gentle air horn that flows to of air-flow angle of attack
calculate fan blade torsion angle Q
i:
Described air-flow angle of attack is empirical value, and span is 0～7 degree; I is natural number, i >=8;
The 5th step, swing and be as the criterion slightly backward during with starting wind velocity, determines length, width, thickness and the material of flexible bat skirt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100889577A CN102720643B (en) | 2012-03-15 | 2012-03-29 | Self-adapting wind blade for wind power generation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210069289 | 2012-03-15 | ||
| CN201210069289.3 | 2012-03-15 | ||
| CN2012100889577A CN102720643B (en) | 2012-03-15 | 2012-03-29 | Self-adapting wind blade for wind power generation |
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| CN102720643A CN102720643A (en) | 2012-10-10 |
| CN102720643B true CN102720643B (en) | 2013-12-18 |
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| DK176352B1 (en) * | 2005-12-20 | 2007-09-10 | Lm Glasfiber As | Profile series for blade for wind turbines |
| US7997870B2 (en) * | 2007-08-14 | 2011-08-16 | B N Balance Energy Solutions, Llc | Turbine rotor for electrical power generation |
| GB2462308A (en) * | 2008-08-01 | 2010-02-03 | Vestas Wind Sys As | Extension portion for wind turbine blade |
| CN101846042A (en) * | 2009-06-06 | 2010-09-29 | 郑重胜 | High-efficiency postpositional blade type wind power generating device |
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