CN103527400A - Method of vertical-shaft wind turbine for improving wind energy utilization through blowing technology - Google Patents

Method of vertical-shaft wind turbine for improving wind energy utilization through blowing technology Download PDF

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Publication number
CN103527400A
CN103527400A CN201310481902.7A CN201310481902A CN103527400A CN 103527400 A CN103527400 A CN 103527400A CN 201310481902 A CN201310481902 A CN 201310481902A CN 103527400 A CN103527400 A CN 103527400A
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China
Prior art keywords
blade
wind turbine
wind
vertical
improving
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Pending
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CN201310481902.7A
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Chinese (zh)
Inventor
李国文
赵国昌
朱建勇
王国鹏
田晶
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Shenyang Aerospace University
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Shenyang Aerospace University
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Priority to CN201310481902.7A priority Critical patent/CN103527400A/en
Publication of CN103527400A publication Critical patent/CN103527400A/en
Pending legal-status Critical Current

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/74Wind turbines with rotation axis perpendicular to the wind direction

Abstract

The method of a vertical-shaft wind turbine for improving wind energy utilization through the blowing technology is achieved through the steps of opening a 1mm seam in the position, 8mm away from the front edge, of the lower surface of a blade of the vertical-shaft wind turbine as an inlet, opening a seam in the position, 8mm away from the tail edge, of the upper surface of the blade as an outlet, enabling the blade of the wind turbine to be connected with a horizontal supporting rod of a draught fan, and enabling the supporting rod to be connected with a rotating shaft through a connecting disc. The method has the effects and advantages that the airflow separation achieved through the blade of the wind turbine is controlled through the blade blowing technology, and therefore the acting time of the airflow on the blade is prolonged, and the positive acting angle of the blade is increased. Meanwhile, the method has the advantages of reducing the separation resistance of the blade, greatly improving the lift drag ratio of the blade, reducing the start-up wind speed of the draught fan, improving the wind energy utilization coefficient and the like.

Description

Vertical axis windmill is used air blowing technology to improve the method for Wind Power Utilization
Technical field: the present invention relates to a kind of method that improves wind mill performance, relate in particular to a kind of vertical axis windmill and use air blowing technology to improve the method for Wind Power Utilization, belong to the applied technical fields such as Wind Power Utilization.
Background technique: along with environment and energy problem become increasingly conspicuous, the development and utilization of renewable energy sources obtains the attention of countries in the world.Wind energy is occupied very large ratio in the utilization of renewable energy sources, and wind-power electricity generation is as the principal mode of Wind Power Utilization is subject to increasing attention.The modern Large-scale Wind Turbines for being incorporated into the power networks, be mostly horizontal axis wind-driven generator group, and technology is very ripe.But the form of utilizing the earliest of wind energy is exactly vertical axis windmill, more late but vertical axis aerogenerator occurs.Be mainly generally believe vertical axis aerogenerator due to people wind energy utilization lower than horizontal axis, thereby cause vertical axis aerogenerator to can not get for a long time paying attention to.Along with the development of lifting wind wheel technology, make the wind energy utilization of vertical axis aerogenerator no longer lower than horizontal axis, and compare with horizontal axis wind-driven generator, it has easy to maintenance, blade design manufacture is simple, and cost is low, does not need advantages such as wind apparatus.
At present pneumatic equipment blades made resistance has two sources: the one, and due to the shearing stress that fluid and body surface friction produce, another is the pressure drag that the asymmetric pressure distribution of body surface produces.If without viscosity flow, the total effect of pressure being subject to before and after object equates, does not therefore have pressure drag.In reality, the effect in boundary layer is similar to and has reduced flow channel (or can be regarded as the equivalent thickness that has increased object), little while making afterbody pressure ratio without viscosity flow, forms pressure drag.While there is separation when flowing, separation zone speed is very little, and from separation point, pressure is substantially constant.Separated by formation separation zone, rear portion and wake flow at object, they are all low pressure areas, will cause very strong pressure drag (separated resistance).Therefore, in order to make resistance reduce just the development in boundary layer to be controlled in minimum limit, and manage to prevent separation.The selections of fairshaped employing and the optimum angle of flare of Diffuser etc., are all based upon in this viewpoint, particularly all the more so in the design of aerofoil profile.For example the thickest position of wing is moved backward, the pressure gradient of wing suction surface is diminished as much as possible, at this moment boundary layer can be more stable, and easily keep laminar flow.The wall shearing stress of laminar boundary layer is little compared with turbulent flow, so formed the little aerofoil profile (laminar flow airfoil) of comparison of resistance.Said method is by the main flow to beyond boundary layer, to flow to control to prevent that Development of Boundary Layer is with separated.In contrast, do not change main flow state and by direct change layer behavior, realize flow separation control and can realize.
Blade air blowing technology is to use the flow characteristic of fan blade own, at blade suction surface, cracks, and utilizes the suction airstream of suction surface to blow and come from pressure side, to blade separation zone Implantation Energy, forms controlled disturbance, changes the technology of flowing state.Blowing gas stream flows to boundary layer Implantation Energy by induction near wall, strengthens the ability of boundary layer opposing stall separation.Can effectively suppress boundary layer and increase and flow separation, reduce resistance and flow losses.
Vertical axis windmill has three kinds of forms of utilizing wind energy at present: 1) lift-type is that application is wider at present, because can there be higher power coefficient; 2) resistance type, tip-speed ratio is less, but easily starting; 3) rise resistance hybrid type, this kind of combination is to combine the drawback of above two kinds, gets its advantage, but under large tip-speed ratio, resistance unit can become the resistance of whole blower fan.Therefore the application development of lift-type on vertical axis windmill is very potential.
Summary of the invention: the present invention is in order to solve vertical shaft lift type wind energy conversion system in rotary electrification process, the blade that absorbs wind energy rotates with respect to running shaft, and the string of a musical instrument angle of wind direction and blade is along with the angle of swing of wind wheel is periodically variable.Each blade sends useful work only at a very little angular range, this is relevant with the stall angle of blade, therefore in order to improve blade acting ability, improve the stall angle of blade, the method that adopting flows controls increases the stall angle of blade, and then the performance of raising wind energy conversion system, absorb more wind energy.
For achieving the above object, the technical solution used in the present invention is: vertical axis windmill is used air blowing technology to improve the method for Wind Power Utilization, the method performing step is: the seam of opening 1mm apart from leading edge 8mm on blade of vertical axis wind turbine lower surface, as entrance, cracks as outlet apart from trailing edge 8mm at blade upper surface; Pneumatic equipment blades made is connected with horizontal fan strut, and strut is connected with running shaft by land.
Effect of the present invention and benefit are: the present invention adopts blade air blowing technology to control pneumatic equipment blades made airflow breakaway, postpone the working application time of air-flow on blade, increase blade and make positive work angle.Reduce the separated resistance of blade simultaneously, greatly improved blade lifting resistance ratio, there is the fan starting of reduction wind speed, improved the advantages such as power coefficient.
Accompanying drawing explanation
Fig. 1 is the structural representation of blade.
Fig. 2 is the plan view of Fig. 1.
Fig. 3 is the structural representation of vertical axis windmill.
Embodiment:
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in the embodiment of the present invention is carried out to clear, intactly description, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiments.Give the embodiment in the present invention, those of ordinary skills, not making the every other embodiment who obtains under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with technological scheme and accompanying drawing, describe a specific embodiment of the present invention in detail.
As depicted in figs. 1 and 2: look into and get aerofoil profile handbook, choose symmetrical airfoil 0018 for experiment aerofoil profile, blade adopts wooden making, for preventing that the blade intensity of cracking is affected.At blade interior design built-in metal steel member, pre-buried 3 of every blade, and every blade steel part position is the same, with Fan-free rotation imbalance.Blade cracks and guarantees not change the original aerodynamic configuration of aerofoil profile.Ready-made vane group is dressed up to experimental framework, be enclosed within on running shaft, finally connect outside laboratory apparatus and test.Vertical shaft fan application air blowing technology, main experimental program by fan blade 1, blowing sews up mouthfuls 2, exports 3 and form.The seam of opening 1mm apart from leading edge 8mm on blade of vertical axis wind turbine 1 lower surface, as entrance 2, cracks as outlet 3 apart from trailing edge 8mm at blade upper surface; Pneumatic equipment blades made is connected with horizontal fan strut 5 by screw 4, and strut 5 is connected with running shaft 7 by land 6.
As shown in Figure 3, assembling axle 8 is connected with blower fan experimental setup fixed base, uses shaft joint to be connected with measurement fan parameter torsionmeter.Blower fan experimental setup adopts 4 blades, is circumferentially evenly arranged, and has the bolt hole being connected with connecting rod 5 on blade 1, uses bolt 4 to be connected with connecting rod 5, and connecting rod is connected with mounting disc 6 by bolt, forms a blower frame.In the mounting disc of blower frame, there is through hole, be enclosed within on running shaft 7, use jackscrew and axle to fix.Assembling axle 8 is connected with running shaft 7.
Working principle
In vertical shaft lift type pneumatic equipment blades made when work,, rely on the lift of blade itself to produce power at rotation round tangential force component, and blade is in rotary course, blade with angle of attack incoming flow in continuous variation.Along with the increase of the angle of attack, blade suction surface airflow breakaway is aggravated gradually, and lift reduces gradually, and tangential component also reduces thereupon, and the acting ability of blade also declines thereupon.In order to postpone the separation of air-flow on blade, adopt the air blowing effect of blade pressure surface to make separated air-flow be attached to the surface of blade, can reduce like this thickness of blade boundary layer, thereby air-flow is well flowed on blade, increase the lift that is hungry, reduced resistance.

Claims (1)

1. vertical axis windmill is used air blowing technology to improve the method for Wind Power Utilization, and the method performing step is: the seam of opening 1mm apart from leading edge 8mm on blade of vertical axis wind turbine lower surface, as entrance, cracks as outlet apart from trailing edge 8mm at blade upper surface; Pneumatic equipment blades made is connected with horizontal fan strut, and strut is connected with running shaft by land.
CN201310481902.7A 2013-10-15 2013-10-15 Method of vertical-shaft wind turbine for improving wind energy utilization through blowing technology Pending CN103527400A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310481902.7A CN103527400A (en) 2013-10-15 2013-10-15 Method of vertical-shaft wind turbine for improving wind energy utilization through blowing technology

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310481902.7A CN103527400A (en) 2013-10-15 2013-10-15 Method of vertical-shaft wind turbine for improving wind energy utilization through blowing technology

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CN103527400A true CN103527400A (en) 2014-01-22

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4132453A1 (en) * 1990-09-27 1992-04-09 Johann Peter Fritz Vane for wind power unit - comprises main vane and at least one fore-vane section
CN201535228U (en) * 2009-03-22 2010-07-28 申振华 Vertical shaft wind turbine driven to jet air
CN101892945A (en) * 2010-07-13 2010-11-24 中国农业大学 Wind turbine blade
GB2477509A (en) * 2010-02-04 2011-08-10 Rolls Royce Plc A vertical axis turbine foil structure with surface fluid transfer openings
CN202991344U (en) * 2012-11-27 2013-06-12 沈阳航空航天大学 Vertical axis air suction wind turbine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4132453A1 (en) * 1990-09-27 1992-04-09 Johann Peter Fritz Vane for wind power unit - comprises main vane and at least one fore-vane section
CN201535228U (en) * 2009-03-22 2010-07-28 申振华 Vertical shaft wind turbine driven to jet air
GB2477509A (en) * 2010-02-04 2011-08-10 Rolls Royce Plc A vertical axis turbine foil structure with surface fluid transfer openings
CN101892945A (en) * 2010-07-13 2010-11-24 中国农业大学 Wind turbine blade
CN202991344U (en) * 2012-11-27 2013-06-12 沈阳航空航天大学 Vertical axis air suction wind turbine

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Application publication date: 20140122