CN208686526U - It is a kind of for inhibiting the change helical angle grooving apparatus of down-wind type of WECS noise - Google Patents
It is a kind of for inhibiting the change helical angle grooving apparatus of down-wind type of WECS noise Download PDFInfo
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- CN208686526U CN208686526U CN201821418757.2U CN201821418757U CN208686526U CN 208686526 U CN208686526 U CN 208686526U CN 201821418757 U CN201821418757 U CN 201821418757U CN 208686526 U CN208686526 U CN 208686526U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/728—Onshore wind turbines
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Abstract
It is a kind of for inhibiting the change helical angle grooving apparatus of down-wind type of WECS noise, be related to wind energy conversion system.Equipped with change helical angle grooving apparatus, the change helical angle grooving apparatus is fixed on windmill tower frame, become helical angle grooving apparatus top to flush with windmill tower frame top, becoming helical angle grooving apparatus has 3 regions: region 1, region 2 and region 3, and the region 2 is spiral grooves encrypted area；It is smoothly transitted becoming at helical angle using secondary, spiral grooves bottom is equipped with smooth chamfering.For inhibiting down-wind type of WECS noise, the wind energy conversion system low frequency aerodynamic noise suppressing method structure of use is simple, and it is convenient to realize, does not need the control system of additional complexity, noise reduction effect is significant, is a kind of potential down-wind type of WECS noise suppression proposal.
Description
Technical field
The utility model relates to wind energy conversion systems, more particularly, to a kind of for inhibiting the change helical angle of down-wind type of WECS noise
Grooving apparatus.
Background technique
Wind energy is increasingly taken seriously as a kind of clean renewable energy, and each state is all greatly developing wind in the world
Electric cause.With the continuous expansion of installed capacity of wind-driven power, the noise problem of wind energy conversion system becomes increasingly conspicuous.If half-hearted research solution
Certainly, a major obstacle for restricting wind-power electricity generation development will be become.Wind energy conversion system noise according to source can be divided into mechanical noise and
Aerodynamic noise.As wind energy conversion system designs and manufactures horizontal raising, the mechanical noise of wind energy conversion system has been substantially reduced, and pneumatically makes an uproar
Sound is still an insoluble problem.Wind energy conversion system aerodynamic noise can be divided into according to production principle: low frequency aerodynamic noise, come
Flow turbulent flow interference noise and blade self noise [1].It is more to the research of blade self noise, incoming flow turbulent flow interference noise at present, it is right
The research of wind energy conversion system low frequency aerodynamic noise is less.With the continuous increase of wind energy conversion system size, wind energy conversion system low frequency aerodynamic noise problem
By [2] more and more prominent, if do not solved, the major obstacle for restricting wind-powered electricity generation career development will be become, therefore need to carry out wind energy conversion system
Low frequency aerodynamic noise inhibits research.
Wind energy conversion system can be divided into windward formula wind energy conversion system according to the relative position of wind wheel and pylon (wind wheel is in the upstream of pylon)
With down-wind type of WECS (wind wheel is in the downstream of pylon).Wind energy conversion system in power generation process, wind by pylon due to pylon obstruction,
It will affect the size and Orientation of wind, while will cause the load fluctuation on pneumatic equipment bladess surface, here it is the tower shadow of wind energy conversion system effects
Answer [3].The low frequency aerodynamic noise of wind energy conversion system refer to due to pneumatic equipment bladess by the speed of pylon lose region or wake zone with
The unsteady load noise that the Shedding Vortex interaction of pylon generates, the non-stationarity of tower wake is wind energy conversion system in tower shadow effect
The main reason for generating low-frequency noise.For down-wind type of WECS since air-flow will first flow through the leaf that pylon then flows into wind energy conversion system
Piece, therefore the tower shadow effect of down-wind type of WECS is seriously much than windward formula wind energy conversion system.For windward formula wind energy conversion system, tower shadow effect
The low frequency aerodynamic noise that should be generated is smaller, and for down-wind type of WECS, the low frequency aerodynamic noise that tower shadow effect generates is very big, is
Need key problems-solving.
The means for weakening wind energy conversion system tower shadow effect at present mainly have stator flux oriented vector control [4], adaptive
Trailing edge technology [5] etc..Wherein stator flux oriented vector control is to be avoided using complicated control system due to tower shadow
Effect leads to generated output chattering；It using adaptive trailing edge technology, is dropped using the aeroeleastic deformation of aerofoil profile trailing edge
Load fluctuation of the low wind energy conversion system under tower shadow effect effect.However these methods be all using active control technology, and not
The influence of tower shadow effect is reduced from source.Since most pylon is using cylindrical pylon, at present both at home and abroad for circle
Column Wake control has carried out a large amount of research work, achieves a series of achievements.The utility model uses cylindrical wake control
Means processed weaken the non-stationarity of windmill tower frame wake flow to reduce the low frequency levels of aerodynamic noise of wind energy conversion system.
For down-wind type of WECS, wind energy conversion system tower shadow effect is that the wake flow of cylindrical pylon generates work to wind machine oar leaf
With, therefore the low frequency aerodynamic noise that reduce wind energy conversion system substantially seeks to control the wake flow of cylindrical pylon.It is existing
Down-wind type of WECS biggish for low frequency aerodynamic noise is pointed out in research, and flow control method can be used by inhibiting cylindrical tower
The development of frame wake flow Karman vortex street weakens surface load fluctuation when blade passes through tower wake, to reduce the low of wind energy conversion system
Frequency aerodynamic noise.The development for inhibiting cylindrical tower wake Karman vortex street, reduces the low frequency aerodynamic noise of down-wind type of WECS, has
Active Control Method and passive control methods.Active Control Method: it using/air-breathing scheme is blown such as on windmill tower frame, then needs
The control system that blow/getter device, while install complicated is arranged in the surrounding of pylon, this adds increased the cost of equipment and
The out of order probability of equipment, and need biggish energy input.According to passive control methods, then the control must be considered first
Method processed is all effective in each orientation of pylon to wind wheel, and the methods of installation diaphragm plate, installation radome fairing are all just for cylinder
The wake flow in one direction of pylon has control effect, therefore is also not suitable for using.Spiral grooves are that one kind proposed in recent years is novel
Cylindrical wake control device [6,7], have control effect to the incoming flow of all directions, also can effectively press down under high reynolds number
The Karman vortex street structure of cylindrical wake processed, have good drag-reduction effect, these features for weaken wind energy conversion system tower shadow effect,
It is all very favorable for reducing the low frequency levels of aerodynamic noise of wind energy conversion system.
Bibliography:
1.WagnerS,BareibR,GuidatiG.Wind turbine noise[M].Berlin:Springer,
1996:200-210.
2. Li Xiaodong, Xu Yingbo, river Min wind energy conversion system Study of Aerodynamic present condition and developing tendency [J] applied mathematics and power
It learns, 2013,34 (10): 1083-1090.
3.Jung S S,Cheung W S,Cheong C L,et al.Experimental identification of
acoustic emission characteristics of large wind turbines with emphasis on
infrasound and low-frequency noise[J].Journal of the Korean physical society,
2008,53(4):1897-1905.
4.Miyakawa T,Shinohara K,Yamamoto K,et al.A suppression method of
tower shadow effect in wind power system using a wound rotor induction
generator[A].Electric machines and drives conference[C].Miami,Florida,2009.
5.Buhl T,Gaunaa M,Bak C.Potential load reduction using airfoils with
variable trailing edge geomery[J].Journal of solar energy engineering,2005,
127(4):503-516.
6.Huang S.VIV suppression of a two-degree-of-freedom circular
cylinder and drag reduction of a fixed circular cylinder by the use of
helical grooves[J].Journal of fluids and structures,2011,27:1124-1133.
7.Alonzo Garcia A,C del Gutierrez,Jimenez Bernal J A.large eddy
simulation of the subcritical flow over a U-grooved circular cylinder[J]
.Advances in mechanical engineering,2014,ID 418398.
Summary of the invention
The utility model, which is intended to provide, becomes helical angle groove to cylindrical tower by being arranged on down-wind type of WECS pylon
The wake flow of frame is controlled, and wind energy conversion system tower shadow effect is weakened, to realize the one kind for reducing low frequency aerodynamic noise purpose for inhibiting
The change helical angle grooving apparatus of down-wind type of WECS noise.
The utility model, which is equipped with, becomes helical angle grooving apparatus, and the change helical angle grooving apparatus is fixed on windmill tower frame
On, become helical angle grooving apparatus top and flushed with windmill tower frame top, becoming helical angle grooving apparatus has 3 regions: region
1, region 2 and region 3, the region 2 are spiral grooves encrypted area；It is smoothly transitted becoming at helical angle using secondary, spiral goove
Trench bottom is equipped with smooth chamfering.
The change helical angle grooving apparatus cross-section can slot on windmill tower frame.
Cylindrical pylon can be used in the windmill tower frame, on cylindrical pylon, determines and is arranged in region 1 and region 3
The pitch angle alpha of fluting is 30 °~60 °；The helixangleβ that fluting is arranged in region 2 is 10 °~25 °；The length H in region 2 is (0.1
~0.3) R, R are pneumatic equipment bladess span diameter, and the middle line in region 2 and the blade tip trajectory line minimum point of pneumatic equipment bladess are in same
On one horizontal plane；Fluting total length L is (0.5~1.5) R.
The position of the spiral grooves encrypted area is related with pneumatic equipment bladess position, and spiral grooves encrypted area is in wind energy conversion system leaf
On the inside of piece.
Be given below working principle of the utility model is:
For down-wind type of WECS, fluting can effectively inhibit the development of Karman vortex street on cylindrical pylon；Become spiral
Grooving apparatus helical angle is smaller at close wind machine oar leaf blade tip, larger far from blade tip, preferably to inhibit near blade tip
The Karman vortex street structure of cylindrical wake.Become helical angle channel bottom and be equipped with chamfering, to smoothly transit, reduces friction.
The advantages of the utility model, is as follows:
The utility model becomes helical angle grooving apparatus using cylindrical pylon to inhibit down-wind type of WECS in the course of work
In generated low frequency aerodynamic noise, belong to passive flow control technique.Spiral grooves can not only inhibit cylindrical wake toll bar
The development of vortex street, moreover it is possible to play the role of drag reduction.Become the helical angle groove device feature larger for blade tip partial noise, preferably
Inhibit the low-frequency noise of blade tip part.The utility model is for inhibiting down-wind type of WECS noise, the wind energy conversion system low frequency gas of use
Moving noise suppressing method structure is simple, and it is convenient to realize, does not need the control system of additional complexity, and noise reduction effect is significant, is a kind of
Potential down-wind type of WECS noise suppression proposal.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model embodiment.
Fig. 2 is the big logotype of helical angle of the utility model embodiment.
Fig. 3 is the slotting position schematic diagram of the utility model embodiment.
Fig. 4 is the cylindrical pylon trench profile position view of the utility model embodiment.
Fig. 5 is the cylindrical pylon trench profile scale diagrams of the utility model embodiment.
Fig. 6 is the groove dimensions information schematic diagram of the utility model embodiment.
Fig. 7 is the half slot schematic diagram of the utility model embodiment.
Fig. 8 is the oval groove schematic diagram of the utility model embodiment.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
As shown in Figure 1, the utility model embodiment, which is equipped with, becomes helical angle grooving apparatus, the change helical angle grooving apparatus is solid
It is scheduled on windmill tower frame, becomes helical angle grooving apparatus top and flushed with windmill tower frame top, become helical angle grooving apparatus tool
Have 3 regions: region 1, region 2 and region 3, the region 2 is spiral grooves encrypted area, the position of spiral grooves encrypted area with
Pneumatic equipment bladess position is related, and spiral grooves encrypted area is on the inside of pneumatic equipment bladess.It is slipped over becoming at helical angle using secondary light
It crosses, spiral grooves bottom is equipped with smooth chamfering.
Change helical angle grooving apparatus cross-section on windmill tower frame is slotted.
The windmill tower frame is using cylindrical pylon.
Step 1: determining slotting position on cylindrical pylon: 4 start setting up cross-section fluting at tower top.
Step 2: referring to fig. 2, on cylindrical pylon, determining fluting helical angle size.Fluting is set in region 1,3
Pitch angle alpha be 30 °~60 °；It is arranged in region 2 than region 1,3 smaller helical angles, preferably to inhibit the card near blade tip
Door vortex street, the helixangleβ in region 2 are 10 °~25 °.
Step 3: design slotting length.Referring to Fig. 1 and 3, the length H in region 2 is that (R is wind energy conversion system leaf to (0.1~0.3) R
Piece span diameter), the middle line 5 in region 2 and the 7 minimum point S point of blade tip trajectory line of pneumatic equipment bladess 6 are in same level.
Fluting total length L is (0.5~1.5) R.Because length and the position in region 2 has been determined, 1 length of region is from pylon top 4
To 2 upper end of region, 3 length of region is that 2 lower end of region is played at the L of pylon top.As long as the length in region 2 has therefore been determined
Degree, further according to the length in you can get it for the position region 1 and region 3 of S point.
Step 4: the depth and width of design fluting and the geometry of slot.Slot is cross-section slot.Slot should come with level
It is maximum to flow contact area, preferably to inhibit the effect of Karman vortex street.It is equipped with chamfering in slot bottom, chamfering and pylon need smooth mistake
It crosses.Referring to fig. 4, groove is introduced by taking the section CGID on cylindrical pylon as an example, the side CG of the section is overlapped with body diameter, side
CD is overlapped with cylindrical pylon bus 8, with grooves in O, F two o'clock.
The groove of chamfering is equipped with using bottom, referring to Figures 5 and 6, the depth N (0.01D~0.15D) of slot, the width M of slot
(0.001R~0.07R).It is equipped with chamfering in slot bottom, the wall surface 10,11 of slot should be tangent with chamfering, smoothly transits, and reduces friction.It adopts
Chamfer shape is designed with elliptic curve, passes through the shape of control parameter control flume.11 depth of wall surface of slot is n, depth of chamfering a
(0~N), 10 width of wall surface are m, chamfering width b (0~0.5M).Curve meets elliptical equation (1).10 width m of vertical wall surface
Meet relational expression (2)；11 depth n of wall surface meets relational expression (3).In order to enable horizontal incoming flow 1 flows into groove as far as possible, groove exists
The direction of exit tangent line 12 must be consistent with horizontal 9 direction of incoming flow, i.e., vertical with cylindrical pylon bus 8.In Fig. 6, AB two
Point respectively corresponds elliptical long/short axis (or short/long axis) vertex, and constituted curve indicates elliptical a quarter camber line.R is wind
Power machine blade diameter, D are cylindrical tower diameter.
M=m+2b (2)
N=n+a (3)
Referring to Fig. 6, by taking slot OF as an example, it is known that the coordinate of A point is (XA, YA), according to above-mentioned geometrical relationship: the coordinate of A
For (n, 0), the coordinate of B is (a+n, b).Therefore, the length that need to only give a, b, n, m, that is, may know that the coordinate of A, B two o'clock, i.e.,
Required groove size and shape can be obtained.
Work as n=m=0, when a=b=N=M/2, the coordinate (O, 0) of A, the coordinate (a, b) of B.A point and origin O weight at this time
It closes, slot is half slot, the radius r=N of slot, α=90 °, and semicircle groove shape meets equation (4).Shape and the size such as attached drawing of slot
7.This diameter of a circle is overlapped with cylindrical pylon bus 8.Slot exit tangent line 12 and horizontal incoming flow 9 are tangent, and channel bottom is uniform
Transition.The curve constituted is half circular arc.
x2+(y-b)2=a2 (4)
Work as n=m=0, when a ≠ b, the coordinate (O, 0) of A, the coordinate (a, b) of B.A point is overlapped with origin O at this time, and slot is half
Oval groove meets equation (5), and the shape and size of slot are as shown in Figure 8.Tangent line 12 and water of the oval groove at exit point E
Flat 9 direction of incoming flow is consistent, i.e., vertical with the bus 8 of cylindrical pylon.Channel bottom even transition, the curve constituted indicate ellipse
Round half camber line.
Claims (4)
1. a kind of for inhibiting the change helical angle grooving apparatus of down-wind type of WECS noise, it is characterised in that opened equipped with helical angle is become
Slot device, the change helical angle grooving apparatus are fixed on windmill tower frame, become helical angle grooving apparatus top and wind turbine tower
Frame top flushes, and becoming helical angle grooving apparatus has 3 regions: region 1, region 2 and region 3, and the region 2 is spiral grooves
Encrypted area；It is smoothly transitted becoming at helical angle using secondary, spiral grooves bottom is equipped with smooth chamfering.
2. a kind of for inhibiting the change helical angle grooving apparatus of down-wind type of WECS noise as described in claim 1, feature exists
In the change helical angle grooving apparatus, cross-section is slotted on windmill tower frame.
3. a kind of for inhibiting the change helical angle grooving apparatus of down-wind type of WECS noise as described in claim 1, feature exists
In the windmill tower frame using cylindrical pylon.
4. a kind of for inhibiting the change helical angle grooving apparatus of down-wind type of WECS noise as claimed in claim 3, feature exists
In on cylindrical pylon, determine fluting is set in region 1 and region 3 pitch angle alpha be 30 °~60 °；Setting is opened in region 2
The helixangleβ of slot is 10 °~25 °；The length H in region 2 is 0.1R~0.3R, and R is pneumatic equipment bladess span diameter, region 2
The blade tip trajectory line minimum point of middle line and pneumatic equipment bladess is in same level；Fluting total length L is 0.5R~1.5R.
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| CN201821418757.2U CN208686526U (en) | 2018-08-29 | 2018-08-29 | It is a kind of for inhibiting the change helical angle grooving apparatus of down-wind type of WECS noise |
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| CN201821418757.2U CN208686526U (en) | 2018-08-29 | 2018-08-29 | It is a kind of for inhibiting the change helical angle grooving apparatus of down-wind type of WECS noise |
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