CN110550142A - Hull line type of large liquefied gas carrier - Google Patents
Hull line type of large liquefied gas carrier Download PDFInfo
- Publication number
- CN110550142A CN110550142A CN201910358693.4A CN201910358693A CN110550142A CN 110550142 A CN110550142 A CN 110550142A CN 201910358693 A CN201910358693 A CN 201910358693A CN 110550142 A CN110550142 A CN 110550142A
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- CN
- China
- Prior art keywords
- liquefied gas
- large liquefied
- gas carrier
- section
- hull
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
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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
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
- B63B1/06—Shape of fore part
- B63B1/063—Bulbous bows
-
- 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
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
- B63B1/08—Shape of aft part
-
- 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
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
- B63B1/06—Shape of fore part
- B63B2001/066—Substantially vertical stems
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a hull line of a large liquefied gas transport ship, which sequentially comprises a head part, a flow inlet section, a parallel middle body, a flow removing section and a tail part from the bow to the stern. The head vertical line is moved backwards under the requirement of ensuring the total length to be unchanged; under the condition of meeting the requirement of the front body of the cargo hold arrangement, an inflow section assembly line matched with the front body is designed, so that the wave-making resistance is effectively reduced; the length, the width and the height of the bulb are increased, the effect of the bulb bow is fully exerted, and the bow wave is effectively reduced; the position of the engine room is adjusted, the backflow is effectively improved, the flow field of the rear body is smoother, and the wake flow is more uniform; the linear cabin capacity of the ship body is improved by 1000 cubic meters, and compared with the initial linear type, the received power under the linear design working condition is reduced by 5 percent.
Description
Technical Field
the invention relates to the field of ships, in particular to a hull line type of a large liquefied gas carrier.
Background
In the domestic market, the large liquefied gas transport ship has the mature hidden bulbous bow type VLGC of a south of the Yangtze river shipyard, and compared with the similar ships, the ship performance index of the design is found to be better, the water discharge of the line type commonly used in the field is often larger, and as the new IGC specification is adopted for meeting the requirements on the cabin capacity arrangement, the old line type cannot meet the requirements, and needs to be improved in the new line type, so that the performance index is improved from the aspects of reducing the water discharge, reducing the weight of the structure and optimizing the line type on the premise of meeting the specification arrangement requirements.
disclosure of Invention
The invention aims to solve the problems and provide a hull line type of a large liquefied gas transport ship, the capacity of the hull line type of the large liquefied gas transport ship is improved by 1000 cubic meters, and the received power under the line type design working condition is reduced by 5 percent compared with the original line type.
The purpose of the invention is realized as follows:
the invention relates to a hull line of a large liquefied gas transport ship, which is a medium-speed ship with a Fourier number of 0.18-0.2 and a square coefficient of 0.75-0.78 at the speed of the large liquefied gas transport ship, wherein the hull line sequentially comprises a head part, a flow inlet section, a parallel middle body, a flow removing section and a tail part from the bow to the stern, the head part sequentially comprises a bulbous bow, a straight bow column section and an outer floating part from the bottom to the top, and the bulbous bow has a smooth profile from the side view angle of the hull; the lower profile transitions to the bottom of the vessel in an arc; the upper half part of the cross section of the bulbous bow at the head perpendicular line is in a rounded rectangle shape, the lower half part is in a V shape, and the ballast water line forms a section of concave transition area at the joint part of the bulbous bow and the ship body.
the bottom taper angle of the cross section of the bulbous bow in the head perpendicular line of the hull line type of the large liquefied gas carrier is 20 +/-5 degrees, and the height of the bulbous bow is 76-80 percent of the draft height.
The cross section width of the bulbous bow in the head perpendicular line of the hull line of the large liquefied gas carrier is 11 +/-3% of the width of the ship.
the outer drifting part in the hull line form of the large liquefied gas transport ship is of a V-shaped structure with an included angle of 38 +/-3 degrees from the frontal view angle of the hull, and the bottom end of the V-shaped structure smoothly extends to the main deck of the large liquefied gas transport ship from the designed draft height.
the length of the parallel middle body in the hull line form of the large liquefied gas transport ship is 10 +/-3% of the length between the vertical lines.
the length of the defluidizing section in the hull line of the large liquefied gas carrier is 50-55% of the length between vertical lines.
the cross section of the tail part in the hull line form of the large liquefied gas transport ship is gradually changed into a V shape from a U shape, and the tail end of the tail part is a ball tail.
The hull line type of the large liquefied gas transport ship not only reduces wave making resistance under design draft and ballast draft, but also can reduce viscous pressure resistance and improve wake distribution by forming the ball tail on the lower tail fin.
drawings
Figure 1 shows a fore-aft line of the hull line of a large liquefied gas carrier vessel according to the invention;
Fig. 2 shows a cross-sectional view of the hull line of a large liquefied gas carrier according to the invention;
Fig. 3 shows a cross-section of the bulbous bow of the hull line of the large liquefied gas carrier of the invention at the top vertical line;
FIG. 4 shows the fore ballast water line of the ballast draft height of the hull line of a large liquefied gas carrier of the present invention;
FIG. 5 is a schematic view of the bulb bow of the initial linetype of the hull of a large liquefied gas carrier;
FIG. 6 is a schematic view of the bulbous bow of the hull line design condition of the large liquefied gas carrier of the present invention;
FIG. 7 is a schematic view of the hull line design and final bulb for the ballast condition of the large liquefied gas carrier of the present invention;
Fig. 8 shows a tail cross-section of the hull line of a large liquefied gas carrier vessel according to the invention;
FIG. 9 shows the velocity vector field of a large liquefied gas carrier vessel according to the invention before modification of the hull linear skegs;
Fig. 10 shows the velocity vector field after modification of the hull linear skegs of a large liquefied gas carrier vessel according to the invention.
Detailed Description
The present invention will be further described with reference to fig. 1 to 10.
The hull line of the large liquefied gas transport ship comprises a head part, an inflow section, a parallel middle body, a flow removing section and a tail part from the bow to the stern in sequence; the large liquefied gas transport ship is designed into a medium-speed ship with a Fourier number of 0.18 and a square coefficient of 0.75 at the navigational speed;
Fig. 1 and 2 show a fore-body longitudinal and cross-sectional line, respectively, of a large liquefied gas carrier vessel according to the invention. The wave making in the original design of the large liquefied gas transport ship has a certain occupation ratio, so the function of the bulbous bow 1 needs to be fully exerted in the design, under the design waterline, in order to fully exert the function of the bulbous bow 1 for inhibiting the bow wave, the bulbous bow 1 is designed to be more plump, so the bulbous bow is evolved into a figure 6 from a figure 5, the waterlines are correspondingly adjusted to be matched, the wave form under the design waterline is greatly weakened, and the wave making resistance is reduced.
the bulbous bow 1 has smooth profile from the side view of the hull, and the lower profile is transited to the bottom 2 in an arc shape; the upper half part 11 of the cross section of the bulbous bow 1 at the head vertical line 2 (namely the FP line) is in a rounded rectangle shape, the lower half part 12 is in a V shape, and a ballast water line forms a section of concave transition area 3 at the joint part of the bulbous bow 1 and the ship body.
The cross section bottom taper angle of the bulbous bow 1 at the head vertical line 2 is 20 degrees, the height of the bulbous bow 1 is 76 percent of the draft height, the cross section width of the bulbous bow 1 at the head vertical line 2 is 11 percent of the ship width, the outer floating part is in a V-shaped structure with an included angle of 38 degrees from the frontal view angle of the ship body, the bottom end of the V-shaped structure smoothly extends to a main deck 4 of the large liquefied gas transport ship from the designed draft height, the length of the parallel mid-body is 10 percent of the length between the vertical lines, and the length of the defluided line is 50 percent of the length between the vertical lines; the cross section of the tail part gradually changes from a U shape to a V shape, and the tail end of the tail part is a ball tail 5 (namely, a spherical tail fin with a flat upper part and a contracted lower part).
The rapidity under the ballast draft is not ideal in a pool test, observation and analysis show that a section of concave transition region 6 (figure 4) is formed at the joint part of the bulbous bow 1 and the ship body by a ballast water line, secondary wave peaks are caused by the concave of the region, the wave-making resistance is increased, so that the bulbous bow at the front end of the bulbous bow is adjusted, the water line at the bulbous bow is reduced as much as possible, and the concave degree of the transition region is relieved. The cross section of the bulbous bow 1 is finally formed into a tooth shape with a wide top and a narrow bottom (see fig. 3), and the finished bulbous bow 1 is shown in fig. 7.
In order to reduce the viscous pressure resistance, the front half section of the rear body line is designed to be V-shaped, when the rear body line is transited to the tail end, the upper part is flat, and the tail fin at the lower part forms a ball tail 5 so as to enhance the circumferential uniformity of the wake flow of the propeller surface. In fig. 8, the initial linear shape 7' of the tail fin portion is designed to be wide, which causes backflow (shown by an arrow in fig. 9), and after the position of the engine room is adjusted, the ball tail 5 of the modified linear shape 7 of the tail fin portion is narrowed (shown by the arrow in fig. 8), so that the flow field becomes smoother (shown by an arrow in fig. 10), and the resistance is reduced.
In the design of the new line type, the line type is transformed by adopting a semi-parametric deformation technology, the CFD is used for calculating and judging the quality between line type schemes, and the reliability of the judgment result is verified by a large amount of water tank ship model tests. The hull line type of the invention not only reduces wave making resistance under design draft and ballast draft, but also reduces viscous pressure resistance and improves wake distribution by forming the ball tail on the lower tail fin, and the hold capacity is improved by 1000 cubic meters, compared with the initial line type, the received power under the line type design working condition is reduced by 5%.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (7)
1. a ship body line of a large liquefied gas transport ship is a medium-speed ship with the Fourier number of 0.18-0.2 and the square coefficient of 0.75-0.78 under the speed, the ship body line sequentially comprises a head part, an inflow section, a parallel middle body, a defluidization section and a tail part from the bow to the stern, the head part sequentially comprises a bulbous bow, a straight bow column section and an outer drift part from the bottom to the top, and the large liquefied gas transport ship is characterized in that:
The upper half part of the cross section of the bulbous bow at the head perpendicular line of the large liquefied gas carrier is in a rounded rectangle shape, the lower half part is in a V shape, the contour of the upper half part of the bulbous bow is smooth in the side view of the ship body, and the contour of the lower half part is in arc transition to the ship bottom; the connecting part of the bulbous bow and the ship body forms a section of concave transition area at the position of a ballast water line of the large liquefied gas transport ship.
2. A hull line type of a large liquefied gas carrier according to claim 1,
The bottom taper angle of the cross section of the bulbous bow at the head perpendicular line of the large liquefied gas carrier is 20 +/-5 degrees, and the height of the bulbous bow is 76-80 percent of the design draft height of the large liquefied gas carrier.
3. A hull line type of a large liquefied gas carrier according to claim 2,
The width of the cross section of the bulbous bow at the head perpendicular line of the large liquefied gas carrier is 11 +/-3% of the width of the hull of the large liquefied gas carrier.
4. A hull line type of a large liquefied gas carrier according to claim 1, wherein said flare portion has a V-shaped structure with an angle of 38 ± 3 ° in a frontal view of the hull, and a bottom end of the V-shaped structure extends smoothly from a design draft height to a main deck of said large liquefied gas carrier.
5. A hull line type of a large liquefied gas carrier according to claim 1,
the length of the parallel middle body is 10 +/-3% of the length between vertical lines of the large liquefied gas carrier.
6. A hull line type of a large liquefied gas carrier according to claim 1,
The length of the flow removing section is 50-55% of the length between vertical lines of the large liquefied gas transport ship.
7. A hull line type of a large liquefied gas carrier according to claim 1,
The shape of the cross section of the tail part is gradually changed from a U shape to a V shape, and the tail end of the tail part is a ball tail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910358693.4A CN110550142B (en) | 2019-04-30 | 2019-04-30 | Hull line type of large liquefied gas carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910358693.4A CN110550142B (en) | 2019-04-30 | 2019-04-30 | Hull line type of large liquefied gas carrier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110550142A true CN110550142A (en) | 2019-12-10 |
| CN110550142B CN110550142B (en) | 2021-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910358693.4A Active CN110550142B (en) | 2019-04-30 | 2019-04-30 | Hull line type of large liquefied gas carrier |
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| Country | Link |
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| CN (1) | CN110550142B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008013039A (en) * | 2006-07-06 | 2008-01-24 | Mitsui Eng & Shipbuild Co Ltd | Vessel |
| WO2012007035A1 (en) * | 2010-07-14 | 2012-01-19 | Hans Christian Nielsen | Ship with bulbous bow |
| JP2012096756A (en) * | 2010-11-05 | 2012-05-24 | Shin Kurushima Dockyard Co Ltd | Fore shape of enlarged ship |
| CN202320713U (en) * | 2011-10-18 | 2012-07-11 | 上海斯迪安船舶设计有限公司 | Hull form for ocean engineering ship |
| CN102826198A (en) * | 2011-06-16 | 2012-12-19 | 深圳远洋运输股份有限公司 | Water bulk cargo transporting equipment applicable to coastal water areas and south areas of China |
| CN104890807A (en) * | 2014-03-03 | 2015-09-09 | 中集船舶海洋工程设计研究院有限公司 | Ship |
| CN205365975U (en) * | 2015-11-26 | 2016-07-06 | 中国船舶工业集团公司第七〇八研究所 | Reduce additional fin keel and scientific investigation ship that bubble disturbed |
| CN106627986A (en) * | 2016-10-27 | 2017-05-10 | 泰州三福船舶工程有限公司 | 12000 tons chemical ship bow form design |
| CN107416126A (en) * | 2017-07-28 | 2017-12-01 | 中国舰船研究设计中心 | A kind of monomer wears the deep V of wave and hits first ship type |
| CN107600305A (en) * | 2017-09-06 | 2018-01-19 | 中远海运重工有限公司 | Triple c-type stems for ocean engineering class ship |
| CN110114266A (en) * | 2016-12-28 | 2019-08-09 | 日本日联海洋株式会社 | Bow shape |
-
2019
- 2019-04-30 CN CN201910358693.4A patent/CN110550142B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008013039A (en) * | 2006-07-06 | 2008-01-24 | Mitsui Eng & Shipbuild Co Ltd | Vessel |
| WO2012007035A1 (en) * | 2010-07-14 | 2012-01-19 | Hans Christian Nielsen | Ship with bulbous bow |
| JP2012096756A (en) * | 2010-11-05 | 2012-05-24 | Shin Kurushima Dockyard Co Ltd | Fore shape of enlarged ship |
| CN102826198A (en) * | 2011-06-16 | 2012-12-19 | 深圳远洋运输股份有限公司 | Water bulk cargo transporting equipment applicable to coastal water areas and south areas of China |
| CN202320713U (en) * | 2011-10-18 | 2012-07-11 | 上海斯迪安船舶设计有限公司 | Hull form for ocean engineering ship |
| CN104890807A (en) * | 2014-03-03 | 2015-09-09 | 中集船舶海洋工程设计研究院有限公司 | Ship |
| CN205365975U (en) * | 2015-11-26 | 2016-07-06 | 中国船舶工业集团公司第七〇八研究所 | Reduce additional fin keel and scientific investigation ship that bubble disturbed |
| CN106627986A (en) * | 2016-10-27 | 2017-05-10 | 泰州三福船舶工程有限公司 | 12000 tons chemical ship bow form design |
| CN110114266A (en) * | 2016-12-28 | 2019-08-09 | 日本日联海洋株式会社 | Bow shape |
| CN107416126A (en) * | 2017-07-28 | 2017-12-01 | 中国舰船研究设计中心 | A kind of monomer wears the deep V of wave and hits first ship type |
| CN107600305A (en) * | 2017-09-06 | 2018-01-19 | 中远海运重工有限公司 | Triple c-type stems for ocean engineering class ship |
Non-Patent Citations (1)
| Title |
|---|
| 查晶晶等: "84000 m~3 VLGC线型优化与CFD分析", 《船舶》 * |
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