CN113283081A - Design method of wave-resistant floating type fan foundation - Google Patents
Design method of wave-resistant floating type fan foundation Download PDFInfo
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- CN113283081A CN113283081A CN202110574422.XA CN202110574422A CN113283081A CN 113283081 A CN113283081 A CN 113283081A CN 202110574422 A CN202110574422 A CN 202110574422A CN 113283081 A CN113283081 A CN 113283081A
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- 238000007667 floating Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000005188 flotation Methods 0.000 claims description 21
- 230000007704 transition Effects 0.000 claims description 9
- 230000001133 acceleration Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000013535 sea water Substances 0.000 claims description 3
- 238000005457 optimization Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
- F03D13/22—Foundations specially adapted for wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
- F03D13/25—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors specially adapted for offshore installation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/06—Wind turbines or wind farms
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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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
-
- 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
- Y02E10/727—Offshore wind turbines
Abstract
The invention belongs to the field of offshore wind and power engineering, and particularly relates to a design method of a wave-resistant floating type fan foundation, which is characterized by comprising the steps of designing a buoyancy tank assembly in the floating type fan foundation into an upper part, a middle part and a lower part, wherein the upper part, the middle part and the lower part are respectively a basic safe redundant buoyancy tank, a buoyancy tank middle connecting body and a main buoyancy tank, and the cross section area of the buoyancy tank middle connecting body is designed to be smaller than that of the basic safe redundant buoyancy tank and that of the main buoyancy tank, so that the buoyancy tank assembly is of a hourglass structure with the upper end and the lower end being large and the middle being small. According to the invention, the buoyancy tank assembly is designed into a funnel-shaped structure with large upper and lower ends and small middle, and the effective cross-sectional area of the middle wave receiving part is reduced, so that the wave load at the water surface position can be effectively reduced, the movement of the buoyancy tank assembly is reduced, and the operation stability and the generating capacity of the unit are improved.
Description
Technical Field
The invention belongs to the field of offshore wind power engineering, and particularly relates to a design method of a wave-resistant floating type wind turbine foundation.
Background
With the rapid development of the offshore wind power industry in China, offshore wind resources are developed continuously, and the offshore wind power industry gradually develops towards deep sea at present. Compared with the traditional pile type foundation and jacket foundation and the floating type foundation, the floating type foundation has the advantages of being strong in adaptation to deep water conditions, capable of better utilizing wind energy resources and the like, and the advantages of the floating type foundation are more obvious along with the increase of water depth.
The existing floating foundation in Europe is mostly a three-cylinder pontoon type floating foundation, a fan tower cylinder and a wind wheel are erected above a pontoon box or at the geometric center of a foundation plane, the pontoon of the pontoon is in a form that the upper section and the lower section have the same diameter, and the motion of swaying, surging, yawing, rolling, pitching and heaving can occur after the action of waves and ocean currents on the sea surface, and the motion amplitude is large, so that the floating foundation is not beneficial to fan power generation, and the influence on the fatigue of the foundation can also be increased.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides a technical scheme of a design method of a wave-resistant floating type fan foundation.
The design method of the wave-resistant floating type wind turbine foundation is characterized in that: the floating box assembly in the floating fan foundation is designed into an upper part, a middle part and a lower part which are respectively a basic safe redundant floating barrel, a floating box middle connecting body and a main floating barrel, wherein the cross section area of the floating box middle connecting body is designed to be smaller than that of the basic safe redundant floating barrel and that of the main floating barrel, so that the floating box assembly is of a hourglass type structure with the upper end and the lower end being large and the middle being small.
The design method of the wave-resistant floating type wind turbine foundation is characterized in that the cross section area of the middle connecting body of the buoyancy tank is designed to be smaller than the cross section area of the basic safety redundant buoy and the cross section area of the main buoy according to a Morison wave force calculation formula.
The design method of the wave-resistant floating type wind turbine foundation is characterized in that the Morison wave force calculation formula is as follows:
wherein Cm: coefficient of inertia force;
cd: drag force coefficient;
u: the relative velocity of the water particles perpendicular to the component axis;
d: the diameter of the member submerged in water;
ρ: density of seawater;
from above-mentioned formula can know, under the unchangeable circumstances of quality of water point speed and acceleration, through the diameter that reduces the flotation tank subassembly, can reduce the wave power of structure, because the wave effort near the water face line is big, consequently, reduces the flotation tank intermediate junction body diameter near the water face line, reduces the wave power, and flotation tank subassembly itself needs by sufficient buoyancy, consequently, the cross sectional area of the redundant flotation pontoon of basic safety and main flotation pontoon will be greater than the cross sectional area of flotation tank intermediate junction body.
The design method of the wave-resistant floating type fan foundation is characterized in that the foundation safety redundant buoy, the buoyancy tank middle connecting body and the main buoy are designed into a circular structure.
The design method of the wave-resistant floating type wind turbine foundation is characterized in that the bottom of the foundation safety redundant buoy is designed into a first conical transition section.
The design method of the wave-resistant floating type wind turbine foundation is characterized in that the top of the main buoy is designed into a second conical transition section.
The design method of the anti-wave floating type wind turbine foundation is characterized in that a ballast tank is arranged at the bottom of a main buoy to increase the pressure capacity and the buoyancy.
The design method of the wave-resistant floating type wind turbine foundation is characterized in that the cross section area of a ballast tank is designed to be larger than that of a main buoy.
The invention has the beneficial effects that:
1) according to the invention, the buoyancy tank assembly is designed into a funnel-shaped structure with large upper and lower ends and small middle, and the effective cross-sectional area of the middle wave receiving part is reduced, so that the wave load at the water surface position can be effectively reduced, the movement of the buoyancy tank assembly is reduced, and the operation stability and the generating capacity of a unit are improved;
2) compared with the traditional foundation, the gravity center position of the designed foundation is lower, so that the inclination state recovery of the fan is facilitated, and the stability is better;
3) when the buoyancy tank assembly designed by the invention is impacted by a ship, the basic safe redundant buoyancy tank at the upper part can provide enough buoyancy, and the buoyancy tank assembly cannot overturn even if the buoyancy tank assembly inclines;
4) the designed foundation has small resistance at the water surface, is more suitable for wet transportation than the traditional floating foundation, has relatively low requirement on the capacity of a tugboat, and can save towing cost.
Drawings
FIG. 1 is a schematic view of a floating wind turbine foundation structure designed according to the present invention;
fig. 2 is a schematic view of the use state of the floating type fan foundation designed by the invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "central", "end", "length", "outer end", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
The invention provides a design method of a wave-resistant floating type fan foundation, which utilizes a special buoyancy tank structural form for arrangement, can effectively reduce wave load acting on the foundation compared with other floating foundations with deeper draft, and simultaneously reduces the motion of a floating body, thereby ensuring that a unit can safely and reliably operate and simultaneously improving the power generation efficiency. The invention will be further explained with reference to the drawings.
A design method of a wave-resistant floating type fan foundation is disclosed, the structure of the wave-resistant floating type fan foundation is shown in figures 1 and 2, the wave-resistant floating type fan foundation comprises a plurality of buoyancy tank assemblies which form a polygonal structure, adjacent buoyancy tank assemblies are connected in a matched mode through a connecting assembly, and the design method comprises the following steps: the buoyancy tank assembly in the floating type fan foundation is designed into an upper part, a middle part and a lower part which are respectively a basic safe redundant buoyancy tank 1, a buoyancy tank middle connecting body 2 and a main buoyancy tank 3, wherein the cross section area of the buoyancy tank middle connecting body 2 is designed to be smaller than that of the basic safe redundant buoyancy tank 1 and that of the main buoyancy tank 3, so that the buoyancy tank assembly is of a hourglass type structure with the large upper end and the large lower end and the small middle part.
Further, the design method is that the cross section area of the buoyancy tank intermediate connecting body 2 is designed to be smaller than that of the basic safety redundant buoy 1 and that of the main buoy 3 according to a Morison wave force calculation formula.
The application precondition of the Morison wave force calculation formula is as follows: d/lambda is less than 0.2, wherein D is the diameter of the tubular pile member at the still water level, lambda is the wavelength,
the calculation formula of the Morison wave force is as follows:
wherein Cm is an inertia force coefficient, and the constant is generally 2.0;
cd is the drag force coefficient, and the constant is generally 1.2;
u is the relative velocity of the water particle perpendicular to the component axis;
d: the diameter of the member submerged in water;
ρ: density of seawater;
from the above formula, under the unchangeable circumstances of quality of water point speed and acceleration, through the diameter that reduces the flotation tank subassembly, can reduce the wave power of structure, because the wave effort near the water surface line is big, consequently, reduces 2 diameters of the flotation tank intermediate junction body near the water surface line, reduces the wave power, and the flotation tank subassembly itself needs by sufficient buoyancy, consequently, the cross sectional area of the redundant flotation pontoon 1 of basic safety and main flotation pontoon 3 will be greater than the cross sectional area of flotation tank intermediate junction body 2.
As an optimization: the basic safety redundant buoy 1, the buoyancy tank middle connecting body 2 and the main buoy 3 are designed to be of a circular structure. The outer diameters of the basic safety redundant buoy 1 and the main buoy 3 are the same and are larger than the outer diameter of the middle connecting body 2 of the buoyancy tank.
Further, the bottom of the basic safety redundant buoy 1 is designed into a first conical transition section 100, the outer diameter of the top of the first conical transition section 100 is the same as that of the basic safety redundant buoy 1, and the outer diameter of the bottom is the same as that of the middle connecting body 2 of the buoyancy tank; the top of the main buoy 3 is designed into a second conical transition section 300, the outer diameter of the top of the second conical transition section 300 is the same as that of the middle connecting body 2 of the buoyancy tank, and the outer diameter of the bottom of the second conical transition section 300 is the same as that of the main buoy 3.
As an optimization: the ballast amount and lift buoyancy are increased by arranging ballast tanks 5 at the bottom of the main buoy 3.
Further, the cross-sectional area of the ballast tank 5 is designed to be larger than the cross-sectional area of the main buoy 3.
The ballast tank 5 adopts a structure larger than the diameter of the main buoy 3, the main reason is that the part is far away from the water line and is less in wave force, and the diameter of the ballast tank 5 is larger, so that not only can enough ballast amount be provided, but also the whole buoyancy can be effectively improved.
As an optimization: coupling assembling adopts truss structure 4, truss structure 4 links to each other with basic safe redundant flotation pontoon 1 and the main flotation pontoon 3 among the corresponding flotation tank subassembly. Specifically, the truss structure 4 includes a first fixing member 400 connected between the two basic safety redundant buoys 1 in a matching manner, a second fixing member 401 connected between the two main buoys 3 in a matching manner, and a third fixing member 402 connected between the basic safety redundant buoys 1 and the second fixing member 401 in a matching manner.
The design principle of the invention is as follows:
when buoyancy tank subassembly bottom segment provides enough buoyancy, buoyancy tank subassembly middle part is less in near position diameter of the surface of water, and according to the calculation formula of Morison wave force, the wave force that the wave produced the cylinder reduces and reduces along with the diameter to near the marine wind power showy formula basis surface of water received the sea condition influence and leaded to the great problem of body motion.
The effect of the basic safe redundant buoy 1 is that when the main buoy 3 near the water surface line is impacted by a ship, the cabin is broken, and when the whole buoy inclines, the safe redundant buoy 1 on the upper part still can provide buoyancy, so that the buoy assembly is guaranteed to incline but not overturn.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A design method of a wave-resistant floating type wind turbine foundation is characterized by comprising the following steps: the buoyancy tank assembly in the floating type fan foundation is designed into an upper part, a middle part and a lower part which are respectively a basic safe redundant buoyancy tank (1), a buoyancy tank middle connecting body (2) and a main buoyancy tank (3), wherein the cross sectional area of the buoyancy tank middle connecting body (2) is designed to be smaller than that of the basic safe redundant buoyancy tank (1) and that of the main buoyancy tank (3), so that the buoyancy tank assembly is of a hourglass type structure with two large ends and a small middle part.
2. The method for designing a wave-resistant floating wind turbine foundation according to claim 1, wherein the cross-sectional area of the buoyancy tank intermediate connection body (2) is designed to be smaller than the cross-sectional area of the foundation safety redundant buoy (1) and the cross-sectional area of the main buoy (3) according to the Morison wave force calculation formula.
3. The method according to claim 2, wherein the Morison wave force calculation formula is:
wherein Cm is the coefficient of inertia force;
cd is drag force coefficient;
u is the relative velocity of the water particle perpendicular to the component axis;
d, the diameter of the member submerged in water;
ρ: density of seawater;
from the above formula, under the unchangeable circumstances of quality of water point speed and acceleration, through reducing the diameter of flotation tank subassembly, can reduce the wave force of structure, because the wave effort near the water surface line is big, consequently, reduce the flotation tank intermediate junction body (2) diameter near the water surface line, reduce the wave force, and the flotation tank subassembly itself needs by sufficient buoyancy, consequently, the cross sectional area of the redundant flotation pontoon of basic safety (1) and main flotation pontoon (3) will be greater than the cross sectional area of flotation tank intermediate junction body (2).
4. A method of designing a wave-resistant floating wind turbine foundation according to any of claims 1-3, characterised in that the foundation safety redundant pontoon (1), the pontoon intermediate connection body (2) and the main pontoon (3) are designed as a circular structure.
5. A method of designing a wave-resistant floating wind turbine foundation according to claim 4, characterised in that the bottom of the foundation safety redundant buoy (1) is designed as a first conical transition section (100).
6. A method of designing a wave-resistant floating wind turbine foundation according to claim 4, characterised in that the top of the main pontoon (3) is designed as a second conical transition section (300).
7. A method of designing a wave-resistive floating wind turbine foundation according to any of claims 1-3, characterized in that the ballast capacity and buoyancy are increased by arranging ballast tanks (5) at the bottom of the main buoy (3).
8. A method of designing a wave-resistant floating wind turbine foundation according to claim 7, characterised in that the cross-sectional area of the ballast tanks (5) is designed to be larger than the cross-sectional area of the main buoy (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110574422.XA CN113283081A (en) | 2021-05-25 | 2021-05-25 | Design method of wave-resistant floating type fan foundation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110574422.XA CN113283081A (en) | 2021-05-25 | 2021-05-25 | Design method of wave-resistant floating type fan foundation |
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| CN113283081A true CN113283081A (en) | 2021-08-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114892703A (en) * | 2022-04-12 | 2022-08-12 | 中国电建集团华东勘测设计研究院有限公司 | Double-cone grid plate type offshore wind power floating foundation structure |
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| CN110001877A (en) * | 2019-04-17 | 2019-07-12 | 华南理工大学 | A kind of three float type offshore wind power foundation of variable cross-section type |
| CN110414102A (en) * | 2019-07-16 | 2019-11-05 | 大连理工大学 | Oversea wind power generation structural fatigue analysis method |
| CN111361699A (en) * | 2020-04-01 | 2020-07-03 | 中山大学 | Floating wind power platform suitable for near-shore shallow water area |
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2021
- 2021-05-25 CN CN202110574422.XA patent/CN113283081A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| CN103010417A (en) * | 2012-12-21 | 2013-04-03 | 天津大学 | Offshore wind power floating foundation suitable for small water plane with water depth below 100m |
| CN108757336A (en) * | 2018-05-03 | 2018-11-06 | 明阳智慧能源集团股份公司 | A kind of four columns band ballast semi-submersible type floating blower foundation |
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