CN109436182A - Equal altitude above deck bulb bow suitable for medium-sized rescue ship - Google Patents
Equal altitude above deck bulb bow suitable for medium-sized rescue ship Download PDFInfo
- Publication number
- CN109436182A CN109436182A CN201811257844.9A CN201811257844A CN109436182A CN 109436182 A CN109436182 A CN 109436182A CN 201811257844 A CN201811257844 A CN 201811257844A CN 109436182 A CN109436182 A CN 109436182A
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- Prior art keywords
- bulb bow
- ship
- bow
- medium
- bulb
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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
- B63B1/06—Shape of fore part
- B63B1/063—Bulbous bows
-
- 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)
- Emergency Lowering Means (AREA)
Abstract
The invention discloses a kind of equal altitude above deck bulb bow suitable for medium-sized rescue ship, the starting point of bulb bow is the highest point of bulb bow；The starting point of bulb bow and the forward terminal of main deck coincide, and the front end point of bulb bow is located on Ship Design waterline, and 20%~40% part that the highest point of bulb bow accounts for bulb bow total height down is located on Ship Design waterline.Bulb bow of the invention can not only greatly improve quick performance of the medium-sized rescue ship under low sea situation, but also can improve rapidity and sea-keeping that medium-sized rescue ship navigates by water under high sea situation.
Description
Technical field
The present invention relates to technical field of ships, in particular to a kind of equal altitude above deck ball nose suitable for medium-sized rescue ship
Bow.
Background technique
Novel medium-sized salvage ship is that China is carried on the back in the Major Strategics such as " ocean power " and " 21 century Maritime Silk Road "
Under scape, the ship of construction is given an written reply further to promote life at sea lifesaving and ship relief ability.The ship carry human life and
The rescue mission of property, under the rapidity and high sea situation under low sea situation rapidity and sea-keeping have very high requirement.
Froude number Fr is greater than 0.3 under the ship design speed state, and not less than the existing large-scale rescue ship ship in China, belongs to middle height
Fast ship, but its main scale parameter length-width ratio (L/B) is smaller, and direction coefficient (CB) is bigger, and quick performance is more unfavorable, master
Scale is also smaller, and the navigation performance in wave is also more unfavorable.
Currently, China's rescue ship mainly uses two kinds of fore body forms: conventional bow and immersion bulb bow.As shown in Figure 1, often
It advises bow 91 and is set to 92 lower section of Ship Design waterline.Conventional bow is the traditional stem form of comparison, and anticollision is preferable, and structure letter
It is single, it is easy to build.As shown in Fig. 2, immersion bulb bow 93 is set to the lower section of Ship Design waterline 94.Immersion bulb bow is normal
The bulb bow form of rule, bulb bow are completely submerged under Ship Design waterline, are wished the wave absorption principle by bulb bow, are reached
Reduce wave making resistance, and then reduces the purpose of ship drag overall.
Medium-sized salvage ship is had the following disadvantages: using conventional bow
1, this ship belongs to high speed ship, and wave making resistance occupies very big specific gravity in drag overall, and conventional bow is unfavorable for reducing
Wave making resistance.
2, fore body will appear more serious breaker phenomenon.
3, for compared with bulb bow, pitch damping is smaller, and pitching amplitude is larger.
4, rescue ship cabin multidigit is in middle front part, it is entire on build also be located in it is to the front, therefore position of centre of gravity compares before examination, first
Phenomenon of inclining is serious.For bulb bow, the stem buoyancy that conventional bow can provide is smaller, and displacement hull position is rearward, unfavorable
It is adjusted in floading condition.
5, bow outline space is smaller, and side feeding is caused to postpone shifting, is unfavorable for needing the working condition of dynamic positioning.
Medium-sized salvage ship uses immersion bulb bow, has the following disadvantages:
1, due to the hydrodynamic force feature of this ship, in Ship Design waterline immersion bulb bow do not play sufficiently reduce it is emerging
The effect of wave resistance.
2, immersion bulb bow is due to being fully located under Ship Design waterline line, and rescue ship is when being greater than Ship Design waterline
Operating condition operation when, the effect of bulb bow more weakens, and in larger drinking water, or even doesn't work at all.
3, fore body still has more serious breaker phenomenon.
4, more conventional bow pitch damping makes moderate progress, but pitching amplitude is still larger.
Summary of the invention
The technical problem to be solved by the present invention is to provide one kind and be suitable for overcome drawbacks described above of the existing technology
The equal altitude above deck bulb bow of medium-sized rescue ship.
The present invention is to solve above-mentioned technical problem by following technical proposals:
A kind of equal altitude above deck bulb bow suitable for medium-sized rescue ship, the starting point of bulb bow are the highest point of bulb bow；
The starting point of bulb bow and the forward terminal of main deck coincide, and the front end point of bulb bow is located on Ship Design waterline, bulb bow
Highest point account for 20%~40% part of bulb bow total height down and be located on Ship Design waterline.
Preferably, the part that the highest point of bulb bow accounts for the one third of bulb bow total height down is located at Ship Design water
On line.It is computed and ship model experiment is verified, for medium-sized rescue ship, bulb bow exposes total height on Ship Design waterline
When the one third of degree, the resistance that can reduce is maximum, and pitching amplitude reduces at most, or even can eliminate stem breaker and show
As.
Preferably, shipful waterline is located between the starting point of bulb bow and the front end point of bulb bow.Medium-sized rescue ship
Full load, the top of bulb bow can still be located at the top of the water surface, may make the bulb bow of full load remains to play to reduce in this way
Wave making resistance, improvement even are eliminated stem breaker phenomenon, substantially reduce the effects of pitching amplitude.
Preferably, the front end point of bulb bow is no more than the front end point of the superstructure positioned at foremost part of ship.In this way, ball
When the front end point of nose bow and the front end point of the superstructure positioned at foremost part of ship flush, the length longest of bulb bow, in this way
It can be acted on the drag reduction of further expansion bulb bow.
Preferably, the bottom of bulb bow and the bottom of ship are tangent.In this way, bulb bow is made to connect with bottom of ship more
It is smooth, it can reduce the resistance of ship.
Preferably, the height of bulb bow is identical as main deck height.
The positive effect of the present invention is that: when navigating by water under hydrostatic or low sea situation, bulb bow of the invention can
Giving full play to it reduces the effect of wave making resistance；Greatly improve rescue ship rapidity.When being navigated by water under high sea situation, ball of the invention
Nose bow can increase ship pitch damping, substantially reduce pitching amplitude.Bulb bow of the invention can also substantially improve very
To elimination stem breaker phenomenon.Since bulb bow volume of the present invention is larger, hull centre of buoyancy is caused to move forward, this makes floating to ship again
The adjustment of state is advantageously.
Detailed description of the invention
Fig. 1 is the schematic side view of existing conventional bow.
Fig. 2 is the schematic side view of existing immersion bulb bow.
Fig. 3 is the schematic side view of present pre-ferred embodiments.
Specific embodiment
A preferred embodiment is named, and completely illustrates the present invention in conjunction with attached drawing to become apparent from.
As shown in figure 3, a kind of equal altitude above deck bulb bow suitable for medium-sized rescue ship, the starting point 10 of bulb bow are ball nose
The highest point of bow；The starting point 10 of bulb bow and the forward terminal of main deck 20 coincide.The height of bulb bow and the height of main deck 20
It spends identical.
The front end point 30 of bulb bow is located on Ship Design waterline 40.
20%~40% part that the highest point of bulb bow accounts for bulb bow total height down is located at Ship Design waterline 40
On.In the present embodiment, the part that the highest point of bulb bow accounts for the one third of bulb bow total height down is located at Ship Design
On waterline.
Shipful waterline 50 is located between the starting point 10 of bulb bow and the front end point 30 of bulb bow.
The front end point 30 of bulb bow is no more than the front end point 60 of the superstructure positioned at foremost part of ship.
The bottom 70 of bulb bow and the bottom 80 of ship are tangent.
It is compared with existing immersion bulb bow, the height of the bulb bow of the present embodiment greatly increases.This can be admirably
Hydrodynamic characterisitic of the ship type of medium-sized rescue ship in navigation is adapted to, specifically: the ship type with design speed when being navigated by water, floading condition
When more static have larger sinking and trim by head, immersion bulb bow be at the water surface in hydrostatic hereinafter, navigation when immersion
Bulb bow has very big distance apart from the water surface, and the effect of bulb bow greatly reduces, even without effect；And ball nose of the invention
Bow, it is close apart from the water surface in navigation, the effect of its drag reduction can be given full play to.
The length of bulb bow is longer, and the range of drag reduction effect is bigger.In the present embodiment, the front end point of bulb bow does not surpass
Cross the front end point of the superstructure positioned at foremost part of ship, therefore, the front end point of bulb bow and the upper layer positioned at foremost part of ship
When the front end point of building flushes, the length longest of bulb bow can be acted in this way with the drag reduction of further expansion bulb bow.
Compared to immersion bulb bow, the width of the bulb bow of the present embodiment is bigger, this is conducive to side and pushes away arrange forward, equally
The side of size pushes away can realize dynamic positioning requirement in worse sea situation.
The invention has the following advantages that
1, when navigating by water under hydrostatic or low sea situation, bulb bow of the invention, which can give full play to it, reduces wave making resistance
Effect.It is calculated by CFD (computational fluid dynamics) method and ship model experiment is verified, more conventional bow and submergence under design point
Formula bulb bow can reduce resistance and reach 8%, greatly improve rescue ship rapidity.
2, bulb bow of the invention, which can substantially improve, even is eliminated stem breaker phenomenon.
3, when navigating by water under high sea situation, bulb bow of the invention can increase ship pitch damping, substantially reduce pitching fortune
Dynamic amplitude, is calculated by CFD (computational fluid dynamics) method it is found that pitching amplitude can reduce by 10% or so.
4, since bulb bow volume of the present invention is larger, hull centre of buoyancy is caused to move forward, this makes the adjustment to method of ship floating condition again
Advantageously.
5, immersion bulb bow is compared, width is bigger, this is conducive to side and pushes away arrange forward, and an equal amount of side pushes away can
To realize dynamic positioning requirement in worse sea situation.
Bulb bow of the invention can not only greatly improve quick performance of the medium-sized rescue ship under low sea situation, but also can improve
The rapidity and sea-keeping that medium-sized rescue ship navigates by water under high sea situation.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that this is only
For example, protection scope of the present invention is to be defined by the appended claims.Those skilled in the art without departing substantially from
Under the premise of the principle and substance of the present invention, many changes and modifications may be made, but these change and
Modification each falls within protection scope of the present invention.
Claims (6)
1. a kind of equal altitude above deck bulb bow suitable for medium-sized rescue ship, which is characterized in that the starting point of bulb bow is bulb bow
Highest point；The starting point of bulb bow and the forward terminal of main deck coincide, and the front end point of bulb bow is located at Ship Design waterline
On, 20%~40% part that the highest point of bulb bow accounts for bulb bow total height down is located on Ship Design waterline.
2. as described in claim 1 suitable for the equal altitude above deck bulb bow of medium-sized rescue ship, which is characterized in that bulb bow
The part that highest point accounts for the one third of bulb bow total height down is located on Ship Design waterline.
3. as described in claim 1 suitable for the equal altitude above deck bulb bow of medium-sized rescue ship, which is characterized in that shipful
Waterline is located between the starting point of bulb bow and the front end point of bulb bow.
4. as described in claim 1 suitable for the equal altitude above deck bulb bow of medium-sized rescue ship, which is characterized in that bulb bow
Front end point is no more than the front end point of the superstructure positioned at foremost part of ship.
5. as described in claim 1 suitable for the equal altitude above deck bulb bow of medium-sized rescue ship, which is characterized in that bulb bow
Bottom and the bottom of ship are tangent.
6. as described in claim 1 suitable for the equal altitude above deck bulb bow of medium-sized rescue ship, which is characterized in that bulb bow
Height is identical as main deck height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811257844.9A CN109436182A (en) | 2018-10-26 | 2018-10-26 | Equal altitude above deck bulb bow suitable for medium-sized rescue ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811257844.9A CN109436182A (en) | 2018-10-26 | 2018-10-26 | Equal altitude above deck bulb bow suitable for medium-sized rescue ship |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109436182A true CN109436182A (en) | 2019-03-08 |
Family
ID=65548719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811257844.9A Pending CN109436182A (en) | 2018-10-26 | 2018-10-26 | Equal altitude above deck bulb bow suitable for medium-sized rescue ship |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109436182A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5364392A (en) * | 1976-11-20 | 1978-06-08 | Kawasaki Heavy Ind Ltd | Shape of stem |
| DE2655734A1 (en) * | 1976-12-09 | 1978-06-15 | Lindenau Schiffswerft | Configured bulbous bow for ship - has specified portion of above water-line surface sloping between given limits |
| NL8005535A (en) * | 1980-10-07 | 1982-05-03 | Nescos Scheepsbouwcombinatie B | Modified bulbous ships bow arrangement - has bow top part set back along straight line from bottom part |
| RU2067942C1 (en) * | 1993-11-12 | 1996-10-20 | Виктор Александрович Кокурин | Ship's fore extremity |
| CN203228913U (en) * | 2013-03-11 | 2013-10-09 | 韩通（上海）新能源船舶设计研发有限公司 | Collision protection bulbous bow device |
| CN107054556A (en) * | 2016-12-23 | 2017-08-18 | 中国船舶工业集团公司第七0八研究所 | It is first that one kind reduces the increased novel ball of resistance in waves |
-
2018
- 2018-10-26 CN CN201811257844.9A patent/CN109436182A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5364392A (en) * | 1976-11-20 | 1978-06-08 | Kawasaki Heavy Ind Ltd | Shape of stem |
| DE2655734A1 (en) * | 1976-12-09 | 1978-06-15 | Lindenau Schiffswerft | Configured bulbous bow for ship - has specified portion of above water-line surface sloping between given limits |
| NL8005535A (en) * | 1980-10-07 | 1982-05-03 | Nescos Scheepsbouwcombinatie B | Modified bulbous ships bow arrangement - has bow top part set back along straight line from bottom part |
| RU2067942C1 (en) * | 1993-11-12 | 1996-10-20 | Виктор Александрович Кокурин | Ship's fore extremity |
| CN203228913U (en) * | 2013-03-11 | 2013-10-09 | 韩通（上海）新能源船舶设计研发有限公司 | Collision protection bulbous bow device |
| CN107054556A (en) * | 2016-12-23 | 2017-08-18 | 中国船舶工业集团公司第七0八研究所 | It is first that one kind reduces the increased novel ball of resistance in waves |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190308 |
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| RJ01 | Rejection of invention patent application after publication |