CN113184108A - Do benefit to pipe laying ship moon pool of drag reduction and optimize structure - Google Patents
Do benefit to pipe laying ship moon pool of drag reduction and optimize structure Download PDFInfo
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- CN113184108A CN113184108A CN202110569645.7A CN202110569645A CN113184108A CN 113184108 A CN113184108 A CN 113184108A CN 202110569645 A CN202110569645 A CN 202110569645A CN 113184108 A CN113184108 A CN 113184108A
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- moon pool
- optimization structure
- height
- advancing direction
- horizontal plane
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- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 230000009467 reduction Effects 0.000 title claims abstract description 13
- 230000008901 benefit Effects 0.000 title claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000005457 optimization Methods 0.000 claims description 14
- 230000001603 reducing effect Effects 0.000 abstract description 11
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005553 drilling Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 101100334009 Caenorhabditis elegans rib-2 gene Proteins 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B3/00—Hulls characterised by their structure or component parts
- B63B3/14—Hull parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B3/00—Hulls characterised by their structure or component parts
- B63B3/14—Hull parts
- B63B2003/147—Moon-pools, e.g. for offshore drilling vessels
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
Abstract
The invention provides a pipelaying ship moon pool optimized structure beneficial to resistance reduction, which comprises a moon pool, wherein a flange vertically extending downwards is arranged on the bottom edge of one side of the moon pool close to the advancing direction, and a guide surface inclined towards the horizontal plane is arranged on one side of the flange facing the advancing direction. The guide structure added on the front wall of the moon pool can not reduce the opening area of the moon pool, and the amount of fluid entering the moon pool can be greatly reduced only by adding the corresponding wedge-shaped guide structure on the bottom of the ship, so that the oscillating movement of water in the moon pool is reduced, and the purpose of reducing resistance is achieved.
Description
Technical Field
The invention relates to the field of sea ship transportation, in particular to an auxiliary pipe ship moon pool optimization structure beneficial to drag reduction of an auxiliary pipe ship moon pool in the process of sailing.
Background
Deepwater hoisting pipelaying vessels are one of the most important installations in marine oil and gas production and are generally moved by self-propulsion or towing. In order to perform crane operations, pipelaying operations and underwater construction/installation operations, various special structures are available on the pipelaying vessel. For work, a vertical through opening (i.e. a moon pool) is usually designed near a midship position, the moon pool facilitates the work, but the existence of the moon pool greatly increases the navigation resistance, and researches show that: the additional resistance can account for 10% -30% of the whole ship resistance at medium and low navigation speeds, and can even reach 100% at high navigation speeds, and the design navigation speed of the drilling ship is usually more than 10kn, so that the optimization of the moon pool structure is carried out, and the reduction of the navigation resistance of the drilling ship is an important link for designing the drilling ship.
For safety reasons, the moon pool is generally located in a ship, and typical shapes of the moon pool at present include rectangular, stepped and cylindrical. Existing studies have shown that: the minimum value of the pressure coefficient of the round moon pool is close to half of that of the rectangular moon pool, and the resistance of the stepped moon pool is smaller. In order to solve the problem of water body sloshing, the existing research and optimization modes are mostly optimized from the macroscopic shape of the moon pool, and structures for increasing damping are designed, such as: a damping plate structure (CN 104724248B, CN 204548389U, CN 104724248A) for reducing the fluid agitation in the moonpool cavity; designing anti-sloshing devices (CN101331054B, CN101331054A) in the moon pool; the large diversion moon pool structure (CN 207997953U) is added with a drag reduction structure to reduce the navigation resistance, and round corners are added on the vertical edge of the moon pool to achieve the drag reduction purpose.
However, the existing design mainly focuses on reducing the water sloshing in the moon pool, and the design of local structures such as diversion and the like is rarely involved, so that the piston motion and sloshing of the water in the moon pool cannot be fundamentally eliminated.
Disclosure of Invention
The invention aims to provide an auxiliary tube ship moon pool optimization structure which is beneficial to drag reduction of the auxiliary tube ship moon pool in the process of sailing.
The invention provides a pipelaying ship moon pool optimization structure beneficial to resistance reduction, which comprises a moon pool, wherein a flange vertically extending downwards is arranged on the bottom edge of one side of the moon pool close to the advancing direction, and a guide surface inclined towards the horizontal plane is arranged on one side of the flange facing the advancing direction.
The guide structure added on the front wall of the moon pool can not reduce the opening area of the moon pool, and the amount of fluid entering the moon pool can be greatly reduced only by adding the corresponding wedge-shaped guide structure on the bottom of the ship, so that the oscillating movement of water in the moon pool is reduced, and the purpose of reducing resistance is achieved.
Drawings
FIG. 1 is a schematic illustration of a moon pool configuration according to an embodiment of the present invention;
fig. 2 is a perspective view of a moon pool according to an embodiment of the present invention.
Detailed Description
The detailed structure and implementation process of the present solution are described in detail below with reference to specific embodiments and the accompanying drawings.
As shown in fig. 1 and 2, in one embodiment of the invention, an optimized structure of a moon pool of a pipelaying ship beneficial to drag reduction is disclosed, wherein the moon pool 1 is arranged in the middle of the pipelaying ship, a flange 2 vertically extending downwards is arranged at the bottom edge of the moon pool 1 close to one side of the advancing direction, and a guide surface 21 inclined towards the horizontal plane is arranged at one side of the flange 2 facing the advancing direction.
In the present embodiment, since the vortex generated from the front wall 11 of the moon pool 1 (i.e., the side of the moon pool opposite to the traveling direction of the pipe-laying ship) and flowing downstream is a main source of additional resistance to the moon pool 1, the present embodiment provides the barrier 2 at the bottom of the front wall 11, guides the water in the traveling direction to the bottom of the moon pool 1 by the guide surface 21, and further reduces the flow of the water entering the moon pool 1, thereby relaxing the oscillating motion of the water in the moon pool 1 and achieving the purpose of reducing the additional resistance.
The guide structure added on the front wall of the moon pool can not reduce the opening area of the moon pool, and the amount of fluid entering the moon pool can be greatly reduced only by adding the corresponding wedge-shaped guide structure at the bottom of the ship, so that the oscillating movement of water in the moon pool is reduced, and the purpose of reducing resistance is achieved.
If the inclination angle of the guide surface 21 is too large or too small, the number of vortexes of the water flow in the moon pool 1 is increased, so that the CFD software calculates the best guide effect when the included angle α between the guide surface 21 and the horizontal plane is within the range of 5 to 6 °, preferably 5.71 °. The horizontal plane defined in this application may be the water surface in the moon pool 1, but also a plane in the horizontal direction in the spatial sense.
In another embodiment of the present invention, the bottom of one edge of the moon pool 1 opposite to the traveling direction may be simultaneously set as a slope 3 inclined to the traveling direction. The rear wall (i.e., the side wall on the side opposite to the traveling direction) of the moon pool 1 is configured as a notched slope structure expanding toward the outside of the moon pool 1, which can reduce the impact pressure of the vortex flowing from the front wall 2 and guide the impact force of the vortex to the water surface through the slope 3, thereby reducing the pressure borne on the rear wall 3 of the moon pool 1 and reducing the traveling resistance of the entire moon pool 1.
Although the opening area of the bottom of the moon pool 1 is increased by adopting the structure of the inclined plane 3 expanding outward, the effect of reducing the impact force and the resistance is achieved by properly optimizing the angle of the inclined plane 3, so that the resistance increased by the increased area is far smaller than the resistance reduced after the structure of the inclined plane notch is added, and the improved structure is suitable.
In addition, according to the target speed, the cut angle of the bevel 3 can be limited, so that the exchange of the bevel 3 and external fluid is reduced, and the optimal drag reduction effect is achieved. In the embodiment, the CFD is used for calculating the included angle beta between the inclined plane 3 and the horizontal plane to be 60 according to the parameters of the moon pool and the navigation speed of the pipe-laying ship～The guiding effect is optimal at 65 deg., preferably 63.34 deg..
The guide surface 21 and the inclined surface 3 of the moon pool 1 can be matched together for use, so that the best resistance reducing effect can be achieved. The guide surface 21 and the inclined surface 3 in the present embodiment are each located below the horizontal plane in the moon pool 1. Wherein, the height of the inclined plane 3 can be 2/3 of the height of the water level in the moon pool 1 or 1/3 of the height of the whole moon pool 1. The guide surface 21 extends in the traveling direction by the same width as the height of the slope 3. And the height of the rib 2 may be about 1/5 of the height of the ramp 3.
In order to achieve the resistance reduction effect more effectively, the moon pool 1 according to the present embodiment is a rectangular moon pool, that is, the moon pool 1 has a rectangular horizontal cross section, and the longitudinal direction is opposite to the traveling direction.
Further, a flange 4 protruding in the axial direction may be provided at a position near the horizontal plane at the bottom of the moon pool 1. The flange 4 can reduce the fluctuation of the water level in the moon pool 1, thereby reducing the water resistance. The flange 4 may be provided separately or simultaneously with the guide surface 21 and the ramp 3.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. The utility model provides a do benefit to pipelaying ship moon pool optimized structure of drag reduction, includes the moon pool, its characterized in that, is provided with the flange of perpendicular extension downwards at the bottom edge of moon pool near advancing direction one side, and the one side that the flange faced advancing direction is the guide face of inclining to the horizontal plane direction.
2. The optimization structure of claim 1,
the guide face with the contained angle between the horizontal plane is 5 ~ 6.
3. The optimization structure of claim 1,
the bottom of the edge of one side of the moon pool opposite to the advancing direction is an inclined plane inclined towards the advancing direction.
4. The optimization structure of claim 3,
the inclined plane with the contained angle of horizontal plane is 60 ~ 65.
5. The optimization structure of claim 3,
the guide surface and the inclined surface are respectively located below the horizontal plane.
6. The optimization structure of claim 5,
the height of the slope is 2/3 the height of the water level in the moon pool, or 1/3 the height of the moon pool.
7. The optimization structure of claim 6,
the width of the guide surface is the same as the height of the slope.
8. The optimization structure of claim 7,
the height of the rib is 1/5 of the height of the inclined plane.
9. The optimization structure of claim 1,
the horizontal section of the moon pool is rectangular, and the length direction of the moon pool is opposite to the advancing direction.
10. The optimization structure of claim 1,
and a flange protruding towards the axis direction is arranged at the position close to the horizontal plane at the bottom of the moon pool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110569645.7A CN113184108A (en) | 2021-05-25 | 2021-05-25 | Do benefit to pipe laying ship moon pool of drag reduction and optimize structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110569645.7A CN113184108A (en) | 2021-05-25 | 2021-05-25 | Do benefit to pipe laying ship moon pool of drag reduction and optimize structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113184108A true CN113184108A (en) | 2021-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110569645.7A Pending CN113184108A (en) | 2021-05-25 | 2021-05-25 | Do benefit to pipe laying ship moon pool of drag reduction and optimize structure |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001158394A (en) * | 1999-12-02 | 2001-06-12 | Mitsubishi Heavy Ind Ltd | Propulsion resistance reducing device of ship with moon pool |
| KR20120138041A (en) * | 2011-06-14 | 2012-12-24 | 현대중공업 주식회사 | Drillship with combining form of moonpool structure considering additional resistance control |
| CN103748006A (en) * | 2012-07-20 | 2014-04-23 | 现代重工业株式会社 | Drillship having block for preventing vortex with concave type flow stabilizer part in moonpool |
| KR20140060668A (en) * | 2012-11-12 | 2014-05-21 | 대우조선해양 주식회사 | Resistance reduction system of offshore |
| CN105015698A (en) * | 2015-08-06 | 2015-11-04 | 哈尔滨工程大学 | Damping device for interior of moon pool of drilling ship |
| CN107640278A (en) * | 2017-09-06 | 2018-01-30 | 中远海运重工有限公司 | Novel high-performance moon pool |
-
2021
- 2021-05-25 CN CN202110569645.7A patent/CN113184108A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001158394A (en) * | 1999-12-02 | 2001-06-12 | Mitsubishi Heavy Ind Ltd | Propulsion resistance reducing device of ship with moon pool |
| KR20120138041A (en) * | 2011-06-14 | 2012-12-24 | 현대중공업 주식회사 | Drillship with combining form of moonpool structure considering additional resistance control |
| CN103748006A (en) * | 2012-07-20 | 2014-04-23 | 现代重工业株式会社 | Drillship having block for preventing vortex with concave type flow stabilizer part in moonpool |
| KR20140060668A (en) * | 2012-11-12 | 2014-05-21 | 대우조선해양 주식회사 | Resistance reduction system of offshore |
| CN105015698A (en) * | 2015-08-06 | 2015-11-04 | 哈尔滨工程大学 | Damping device for interior of moon pool of drilling ship |
| CN107640278A (en) * | 2017-09-06 | 2018-01-30 | 中远海运重工有限公司 | Novel high-performance moon pool |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210730 |
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| RJ01 | Rejection of invention patent application after publication |