CN209724582U - Flow spoiler, blower fan tower barrel and the wind-driven generator including it - Google Patents
Flow spoiler, blower fan tower barrel and the wind-driven generator including it Download PDFInfo
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- CN209724582U CN209724582U CN201920230390.XU CN201920230390U CN209724582U CN 209724582 U CN209724582 U CN 209724582U CN 201920230390 U CN201920230390 U CN 201920230390U CN 209724582 U CN209724582 U CN 209724582U
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- spoiler
- flow spoiler
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- tower
- driven generator
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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
- Y02E10/72—Wind turbines with rotation axis in wind direction
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model discloses a kind of flow spoiler, blower fan tower barrel and including its wind-driven generator.The utility model flow spoiler includes spoiler and interconnecting piece, the spoiler includes broken stream end and multiple sides, the broken stream end and multiple sides, which are connected, constitutes polyhedron, the broken stream end is located at the front end of the flow spoiler, the interconnecting piece is loop connecting portion, and spoiler is arranged on the outside of the loop connecting portion.The utility model flow spoiler, blower fan tower barrel and the wind-driven generator including it, the spoiler construction being made of loop connecting portion and spoiler is simple, and manufacturing cost is low, is also convenient for for flow spoiler being installed to the place of needs.Flow spoiler is installed before wind-driven generator tower lifting, has identical projected life with tower main body, it can inhibit the generation of tower vortex-induced vibration in wind power generating set Life cycle, and not have to maintenance in wind power generating set Life cycle, use cost is low.
Description
Technical field
The utility model relates to avoid vortex-induced vibration technical field, in particular to a kind of flow spoiler, blower fan tower barrel and including
Its wind-driven generator.
Background technique
Wind-driven generator is also blower, is to convert wind energy into mechanical work, and mechanical work drives rotor rotation, final output
The power equipment of alternating current.Blower includes the parts such as tower, blade and generating set.Provisioned in most wind power generating set
Tower, cross section is circular cross-section, when wind pass through tower surface when, be very easy to occur vortex-induced vibration, especially exist
Tower lifting and unit off-position.
The vortex-induced vibration of tower is a kind of covibration, has biggish harm to tower and entire unit, once hair
It is raw, can not only serious fatigue damage be generated to tower and its securing member, threaten the service life of tower, it is also possible to cause tower
The Aerodynamic Instability of cylinder generates serious structure and destroys, even results in the collapsing of entire unit, causes serious economic damage
It loses.Therefore, it is necessary to try every possible means to inhibit the generation of tower vortex-induced vibration.
Inhibit in industry at present tower vortex-induced vibration three kinds of methods and there are the problem of it is as follows:
1, using interim trouble flow strip method.Interim trouble flow strip generally uses foamed plastic to make, and lifetime is shorter, Wu Fachang
Phase uses.It is as a kind of tooling when unit lifts at present, unit lifting will remove after completing for next unit
Lifting.A set of interim trouble flow strip can be used for 5~8 unit liftings.In addition, after working as fan operation for a period of time, if hair
Raw power-off, since interim trouble flow strip has been removed, then can not inhibit tower vortex-induced vibration.
2, using damper method.Damper can only inhibit certain rank specific frequency, and inhibitory effect depends on damper and wind-force
Generating set modal mass ratio, and cost is relatively high.It therefore, is temporarily to make when damper is more as tooling damper
With.Unit lifting is also required to remove after completing, and is used for the lifting of next unit.Thus damper can not give birth to entirely in unit
Inhibit tower vortex-induced vibration in the life phase, can not also inhibit tower vortex-induced vibration in the event of a power failure.
3, using active yawing to wind method.When unit is powered, flow field can be destroyed to wind by active yawing and inhibit whirlpool
Excited vibration, once and unit power off, then unit can not be yawed to wind again, also can not just inhibit tower vortex-induced vibration.
Utility model content
The technical problems to be solved in the utility model is in order to overcome the above-mentioned defects in the prior art, to provide a kind of flow-disturbing
Device, blower fan tower barrel and the wind-driven generator including it.
The utility model is to solve above-mentioned technical problem by following technical proposals:
A kind of flow spoiler, it is characterized in that, including spoiler and interconnecting piece, spoiler include breaking stream end and multiple sides,
Broken stream end and multiple sides, which are connected, constitutes polyhedron, and broken stream end is located at the front end of flow spoiler, and interconnecting piece is loop connecting portion,
Spoiler is set on the outside of loop connecting portion.
Preferably, flow spoiler is used to inhibit the vortex-induced vibration of blower fan tower barrel.
In the present solution, flow spoiler installation before wind-driven generator tower lifts, has identical design with tower main body
Service life can inhibit the generation of tower vortex-induced vibration in wind power generating set Life cycle, and in wind power generating set
Maintenance is not had in Life cycle, use cost is low.
Preferably, interconnecting piece is connecting plate.
Preferably, loop connecting portion includes multiple linkage sections, removably connected between multiple linkage sections, each linkage section
On a spoiler is at least set.
In the present solution, flow spoiler, is installed in place by form using the above structure convenient for scene.
Preferably, loop connecting part is 3 linkage sections, connected between each linkage section by fastener.
In the present solution, form using the above structure, will not the body outer surface paint etc. to installation flow spoiler cause to damage
Wound.
Preferably, interconnecting piece is connect in a welding manner with spoiler.
In the present solution, form using the above structure, improves the firmness that spoiler is connect with interconnecting piece, avoids
The accident of spoiler falls off, and improves the flow spoiler service life, reduces use cost.
Preferably, multiple sides constitute prism, it is stupefied to break the side that stream end is prism.
In the present solution, form using the above structure, is dissolved into side for broken stream end, structure design is simplified, is reduced
Manufacturing cost.
Preferably, the quantity of multiple sides is 5,5 sides constitute triangular prism, break the side that stream end is triangular prism
It is stupefied.
In the present solution, form using the above structure, further simplifies structure design.
Preferably, triangular prism be hollow structure inside shell, shell with a thickness of 0.5mm-5mm.
In the present solution, form using the above structure, greatly reduces the weight of flow spoiler, installed convenient for flow spoiler,
Reduce manufacturing cost.
Preferably, triangular prism is right prism, the bottom surface of right prism is equilateral triangle, and the side length of equilateral triangle is
200mm-300mm。
In the present solution, form using the above structure, does not need to differentiate mounting surface, reduces installation difficulty, be convenient for product
Automated production.
Preferably, the quantity of multiple sides is 6,6 sides constitute the hexahedron of plate, relatively narrow and longer in hexahedron
Face be broken stream end.
In the present solution, form using the above structure, further simplifies structure design.
A kind of wind-driven generator tower, including tower ontology, it is characterized in that, the setting of tower ontology is multiple as above any one
Kind flow spoiler.
Preferably, multiple flow spoiler layering settings.
In the present solution, form using the above structure, both ensure that flow spoiler effect, it is complete from top to bottom in turn avoid tower
Flow spoiler is installed in portion, reduces installation cost.
Preferably, the angle of the mounting plane at the broken stream end and flow spoiler of spoiler is 45 ° -70 °.
In the present solution, form using the above structure, preferably can make air flow through tower, avoid that vortex-induced vibration occurs.
Preferably, the mounting plane of flow spoiler is the sagittal plane of wind-driven generator tower.
Preferably, the top of wind-driven generator tower be equipped with flange face, flange face with apart from flange face recently one layer disturb
The distance for flowing the mounting plane of device is 1.5m-3m, and the distance of the mounting plane of adjacent two layers flow spoiler is 1.2m-1.5m.
Preferably, the gap silica gel sealing between wind-driven generator tower and flow spoiler.
In the present solution, form using the above structure, can prevent rainwater to be deposited in the gap between flow spoiler and tower
Place, can also avoid due to generating additional noise between flow spoiler and tower there are gap.
Preferably, the material of flow spoiler is stainless steel.
It is low in cost also, there is longer service life in the present solution, form using the above structure, it also avoids
The problem of flow spoiler corrosion tower.
Preferably, the outside of tower ontology is arranged in the broken stream end of spoiler in the form of helical lines.
In the present solution, form using the above structure, preferably can make air flow through tower, avoid tower that whirlpool exciting occurs
It is dynamic.
A kind of wind-driven generator, it is characterized in that, including any one wind-driven generator tower as described above.
The positive effect of the utility model is:
The utility model flow spoiler, blower fan tower barrel and the wind-driven generator including it, by loop connecting portion and spoiler structure
At spoiler construction it is simple, manufacturing cost is low, is also convenient for for flow spoiler being installed to the place of needs.Flow spoiler is in wind-power electricity generation
It is installed before the lifting of machine tower, has identical projected life with tower main body, it can be in the full life of wind power generating set
Inhibit the generation of tower vortex-induced vibration in period, and does not have to maintenance, use cost in wind power generating set Life cycle
It is low.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model embodiment 1.
Fig. 2 is the structural schematic diagram of spoiler in the utility model embodiment 1
Fig. 3 is the structural schematic diagram of the utility model embodiment 2.
Fig. 4 is the structural schematic diagram of the utility model embodiment 3.
Fig. 5 is the structural schematic diagram of spoiler in the utility model embodiment 4.
Fig. 6 is the structural schematic diagram of the utility model embodiment 5.
Fig. 7 is the top view of blower fan tower barrel in the utility model embodiment 5.
Fig. 8 is the structural schematic diagram that stream end and interconnecting piece upper surface angle is broken in the utility model embodiment 5.
Description of symbols:
Spoiler 1
Side stupefied 11
Side 12
Bottom surface 13
Narrow side 14
Interconnecting piece 2
Connecting plate 21
Flanging 22
Tower ontology 3
Tower drum flange face 31
Helix 32
Specific embodiment
Illustrate below by the mode of embodiment and completely the utility model in conjunction with attached drawing to become apparent from, but not therefore
The utility model is limited among the embodiment described range.
Embodiment 1
As shown in Figure 1, the utility model provides a kind of flow spoiler, including spoiler 1 and interconnecting piece 2, spoiler 1 includes broken
End and multiple sides are flowed, broken stream end and multiple sides are connected directly composition polyhedron, and broken stream end is located at the front end of the flow spoiler.
Broken stream end is used for separate fluid, and the fluid after separating is shunted along side, to change the flow direction of fluid, avoids the occurrence of whirlpool
Excited vibration phenomenon.Interconnecting piece 2 is loop connecting portion.
In order to achieve the purpose that reduce vortex-induced vibration, the flow spoiler of the utility model can be hung in wind-driven generator tower
It is installed in place before dress, the flow spoiler and tower main body of the utility model have identical projected life, can be in wind-driven generator
Inhibit the generation of tower vortex-induced vibration in group Life cycle, and do not have to maintenance in wind power generating set Life cycle,
Use cost is low.
As shown in Fig. 2, triangular prism is the present embodiment spoiler structural schematic diagram in figure.The present embodiment designs spoiler 1
For triangular prism.Triangular prism shaped spoiler 1 includes 3 sides 12 and 2 bottom surfaces 13, wherein a side stupefied 11 is broken stream end.Side
Stupefied 11 are divided into two fluid, and the fluid after separating continues to flow along close to two sides 12 at broken stream end.To change stream
The flow direction of body avoids the occurrence of vortex-induced vibration phenomenon.
In order to achieve the purpose that reduce flow spoiler weight, the triangular prism of flow spoiler 1 can also be designed as hollow structure
Shell, the thickness of shell are preferably 0.5mm-5mm.
Alternatively, the bottom surface 13 of flow spoiler 1 in Fig. 1 can also be designed as it is vertical with side 12, i.e.,
Triangular prism is designed as right prism, meanwhile, bottom surface 13 is designed as equilateral triangle, and triangle side length is preferably 200mm-300mm.
Form using the above structure does not need to differentiate mounting surface, reduces installation difficulty, be also convenient for the automated production of flow spoiler.
Embodiment 2
As shown in figure 3, the structure of the present embodiment is substantially the same manner as Example 1, the difference is that:
Interconnecting piece 2 is designed as connecting plate 21 by this programme.Flanging 22,22 preboring bolt of flanging is arranged in the both ends of connecting plate 21
Hole is linked together between flanging 22 by bolt assembly, to constitute ring-type.This programme avoids in flow spoiler installation process
Installation body outer surface paint etc. is caused to damage.
Embodiment 3
As shown in figure 4, the structure of the present embodiment is substantially the same manner as Example 2, the difference is that:
3 connecting plates 21 are sequentially connected with together by interconnecting piece 2 in this programme, 3 21 headtotails of connecting plate, constitute ring
1 spoiler 1 is arranged on the outside of each connecting plate 21 for shape.
Alternatively, the quantity of connecting plate 21 in this programme can also be increased and decreased according to the actual situation, often
Multiple spoilers 1 also can be set in a 21 outside of connecting plate.
As a preferred solution, spoiler 1 and interconnecting piece 2 can also be linked together in a welding manner.This
Scheme improves the firmness that spoiler 1 is connect with interconnecting piece 2, and the accident for avoiding spoiler 1 falls off, and improves flow spoiler
Service life, reduce the use cost of flow spoiler.
Embodiment 4
(connection not shown portion 2 in figure) as shown in Figure 5, the structure of the present embodiment difference from example 1 is that:
Spoiler 1 is rectangular slab in this programme.The spoiler 1 of rectangular plate-like include two bottom surfaces 13 of side 12, two and
Two narrow side 14 is constituted, and the narrow side 14 positioned at front is broken stream end.Structure is distinguished in narrow 14 separate fluid of side, two sides 12
At the barrier rib of fluid, fluid is separately flowed along side 12, can also achieve the purpose that avoid the occurrence of vortex-induced vibration phenomenon.
Embodiment 6
As shown in FIG. 6 and 7, the present embodiment is a kind of wind-driven generator tower.The wind-driven generator tower includes tower
Multiple the utility model flow spoilers are arranged in ontology 3,3 periphery of tower ontology.Flow spoiler is in 3 lifting of wind-driven generator tower ontology
Before be installed in place.When air flows through tower ontology 3, the broken stream end 11 of flow spoiler separates air stream, and air stream is along disturbing
Stream device side is upward respectively, flows downward, and avoids air stream and vortex-induced vibration occurs for tower ontology 3.Also, flow spoiler and tower
Cylinder main body 3 has identical projected life, can inhibit 3 vortex-induced vibration of tower ontology in wind power generating set Life cycle
Generation, and do not have to maintenance in wind power generating set Life cycle, use cost is low.
As a preferred solution, flow spoiler can also be stratified and set on tower ontology 3, is not needed tower sheet
Body 3 all installs flow spoiler from top to bottom, reduces installation cost.
As shown in figure 8, as a preferred solution, it can also be by the upper table at the broken stream end 11 of spoiler 1 and interconnecting piece 2
Face angle α is 45 ° -70 °.It, can be by the broken stream end 11 of spoiler 1 and tower ontology 3 if flow spoiler does not have interconnecting piece 2
Sagittal plane angle α is set in 45 ° -70 °, can equally achieve the purpose that avoid that vortex-induced vibration occurs.
It alternatively, can be with the flange face 31 of tower ontology 3 and one layer apart from flange face 31 recently
The distance h1 of flow spoiler mounting plane is 1.5m-3m, and the distance h2 of adjacent two layers flow spoiler mounting plane is 1.2m-1.5m.
It, can also be by tower ontology 3 and flow spoiler in order to avoid rainwater is accumulated in the gap between flow spoiler and tower ontology 3
Between gap silica gel sealing.At the same time it can also avoid additionally making an uproar due to generating between flow spoiler and tower there are gap
The problem of sound.
In order to avoid flow spoiler corrosion tower ontology 3, flow spoiler material can also be selected as stainless steel.
It alternatively, can also be by the broken stream end 11 of spoiler 1 along the helix 32 on tower ontology 3
Arrangement, more smoothly can make air flow through tower, avoid tower that vortex-induced vibration occurs.
The utility model flow spoiler is also applied to other technical fields for being related to avoiding vortex-induced vibration, such as: it is big
The outer wall of the tall and slender structures such as type chimney, signal tower, lamppost can be applied, and the utility model flow spoiler can reach separate fluid,
Change fluid flow direction, to avoid the purpose of vortex-induced vibration.
Although the foregoing describe specific embodiment of the present utility model, it will be appreciated by those of skill in the art that
This is merely illustrative of, and the protection scope of the utility model is defined by the appended claims.Those skilled in the art
Under the premise of without departing substantially from the principles of the present invention and essence, many changes and modifications may be made,
But these change and modification each fall within the protection scope of the utility model.
Claims (20)
1. a kind of flow spoiler, which is characterized in that including spoiler and interconnecting piece, the spoiler includes broken stream end and multiple sides
Face, the broken stream end and multiple sides, which are connected, constitutes polyhedron, and the broken stream end is located at the front end of the flow spoiler, described
Interconnecting piece is loop connecting portion, and the spoiler is arranged on the outside of the loop connecting portion.
2. flow spoiler according to claim 1, which is characterized in that the flow spoiler is used to inhibit the whirlpool exciting of blower fan tower barrel
It is dynamic.
3. flow spoiler according to claim 1, which is characterized in that the interconnecting piece is connecting plate.
4. flow spoiler according to claim 1, which is characterized in that the loop connecting portion includes multiple linkage sections, multiple
It is removably connected between the linkage section, the spoiler is at least set on each linkage section.
5. flow spoiler according to claim 4, which is characterized in that the loop connecting part is 3 linkage sections, often
It is connected between a linkage section by fastener.
6. flow spoiler according to claim 1, which is characterized in that the interconnecting piece and the spoiler are in a welding manner
Connection.
7. flow spoiler according to claim 1, which is characterized in that multiple sides constitute prism, and the broken stream end is
One side of the prism is stupefied.
8. flow spoiler according to claim 1, which is characterized in that the quantity of multiple sides is 5,5 sides
Face constitutes triangular prism, and the broken stream end is that a side of the triangular prism is stupefied.
9. flow spoiler according to claim 8, which is characterized in that the triangular prism is the shell of hollow structure inside, institute
State shell with a thickness of 0.5mm-5mm.
10. flow spoiler according to claim 8, which is characterized in that the triangular prism is right prism, the bottom of the right prism
Face is equilateral triangle, and the side length of the equilateral triangle is 200mm-300mm.
11. flow spoiler according to claim 1, which is characterized in that the quantity of multiple sides is 6,6 sides
Face constitutes the hexahedron of plate, and relatively narrow and longer face is broken stream end in the hexahedron.
12. a kind of wind-driven generator tower, including tower ontology, which is characterized in that the tower ontology setting is multiple such as right
It is required that flow spoiler described in any one of 1-11.
13. wind-driven generator tower according to claim 12, which is characterized in that multiple flow spoiler layering settings.
14. wind-driven generator tower according to claim 13, which is characterized in that the broken stream end of the spoiler with it is described
The angle of the mounting plane of flow spoiler is 45 ° -70 °.
15. wind-driven generator tower according to claim 14, which is characterized in that the mounting plane of the flow spoiler is institute
State the sagittal plane of wind-driven generator tower.
16. wind-driven generator tower according to claim 13, which is characterized in that the top of the wind-driven generator tower
Equipped with flange face, the distance of the flange face and the mounting plane of the one layer flow spoiler nearest apart from the flange face is
1.5m-3m, the distance of the mounting plane of flow spoiler described in adjacent two layers are 1.2m-1.5m.
17. wind-driven generator tower according to claim 12, which is characterized in that the wind-driven generator tower with it is described
Gap silica gel sealing between flow spoiler.
18. wind-driven generator tower according to claim 12, which is characterized in that the material of the flow spoiler is stainless
Steel.
19. wind-driven generator tower described in any one of 2-18 according to claim 1, which is characterized in that the spoiler
Broken stream end the outside of the tower ontology is set in the form of helical lines.
20. a kind of wind-driven generator, which is characterized in that including the wind-power electricity generation as described in any one of claim 12-19
Machine tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920230390.XU CN209724582U (en) | 2019-02-22 | 2019-02-22 | Flow spoiler, blower fan tower barrel and the wind-driven generator including it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920230390.XU CN209724582U (en) | 2019-02-22 | 2019-02-22 | Flow spoiler, blower fan tower barrel and the wind-driven generator including it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209724582U true CN209724582U (en) | 2019-12-03 |
Family
ID=68683910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920230390.XU Active CN209724582U (en) | 2019-02-22 | 2019-02-22 | Flow spoiler, blower fan tower barrel and the wind-driven generator including it |
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| CN (1) | CN209724582U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109737012A (en) * | 2019-02-22 | 2019-05-10 | 上海电气风电集团有限公司 | Flow spoiler, blower fan tower barrel and the wind-driven generator including it |
| CN113531024A (en) * | 2020-04-16 | 2021-10-22 | 上海电气风电集团股份有限公司 | Liquid damper and tower barrel of wind generating set |
| KR102543637B1 (en) * | 2022-10-05 | 2023-06-14 | 한국해양과학기술원 | pier for marine bridge with function of scour protection |
-
2019
- 2019-02-22 CN CN201920230390.XU patent/CN209724582U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109737012A (en) * | 2019-02-22 | 2019-05-10 | 上海电气风电集团有限公司 | Flow spoiler, blower fan tower barrel and the wind-driven generator including it |
| CN113531024A (en) * | 2020-04-16 | 2021-10-22 | 上海电气风电集团股份有限公司 | Liquid damper and tower barrel of wind generating set |
| CN113531024B (en) * | 2020-04-16 | 2023-05-26 | 上海电气风电集团股份有限公司 | Liquid damper and tower of wind generating set |
| KR102543637B1 (en) * | 2022-10-05 | 2023-06-14 | 한국해양과학기술원 | pier for marine bridge with function of scour protection |
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