CN106741586A - A kind of ship water jet constrains bubble drag-reduction structure - Google Patents
A kind of ship water jet constrains bubble drag-reduction structure Download PDFInfo
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- CN106741586A CN106741586A CN201611201166.5A CN201611201166A CN106741586A CN 106741586 A CN106741586 A CN 106741586A CN 201611201166 A CN201611201166 A CN 201611201166A CN 106741586 A CN106741586 A CN 106741586A
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- water jet
- bubble
- ship
- drag
- 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
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
- B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
-
- 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
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
- B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
- B63B2001/385—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes using exhaust gas
-
- 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
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
- B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
- B63B2001/387—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes using means for producing a film of air or air bubbles over at least a significant portion of the hull surface
-
- 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)
- Nozzles (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a kind of ship water jet constraint bubble drag-reduction structure, including the air channel of alow leading edge is set, is also included：The rearmounted injection unit of water jet, including two groups of shower nozzles and high service pipeline, the shower nozzle is towards stern, two groups of shower nozzles are respectively arranged alow both sides and the length direction along hull is distributed, and form high-speed water jet for alow both sides with the floating of the bubble that prevents the air channel from being discharged to hull bottom and escape；The present invention being capable of operative constraint hull bubble motion using water jet constraint bubble drag-reduction technology, greatly reduce escape of the hull bottom bubble along hull both sides, optimization hull bottom bubble coverage rate, to obtain more preferable drag-reduction effect, especially for hull large scale ship more long, the lasting drag-reduction effect in boat length direction is drastically increased, its ship resistance is effectively reduced.
Description
Technical field
The present invention relates to ship bubble drag-reduction technical field, more particularly to a kind of ship water jet constraint bubble drag-reduction knot
Structure.
Background technology
Ship bubble drag-reduction can reduce ship resistance, improve headway, reduce fuel consumption.In numerous drag reductions
In technology, bubble drag-reduction is raised speed and energy-saving field one due to advantages such as simple structure, easily operated and good economy performances in ship
Directly receive much concern.By transforming traditional ship, increase appropriate bubble drag-reduction structure, be expected to obviously improve shipping sail speed,
Reduce ship energy consumption and greenhouse gas emission.
The operation principle of bubble drag-reduction is mainly by continuously spraying compressed air or work waste gas to hull bottom, alow table
Face forms Gas-water phases stream, and the presence of a large amount of bubbles of hull bottom can cause the change of hull bottom media property and fluidal texture.Due to
The change of the Media density, viscosity and wall boundary layer flow structure of hull bottom contact causes that frictional resistance of ship body is significantly reduced.From
From the point of view of numerous flat board bubble drag-reduction result of the tests, the drag-reduction effect of bubble drag-reduction substantially, maximum drag reducing efficiency up to more than 80%,
It is considered as a kind of efficient drag reduction mode.
Although however, bubble drag-reduction technology is feasible in mechanism, also there is obvious drag-reduction effect, mesh in treadmill test
The drag-reduction effect of preceding bubble drag-reduction ship trial is still undesirable.Because real ship hull bottom molded line is complicated, bubble floating and escape are serious
The problems such as, presently preferred real ship bubble drag-reduction saves power only at several percentage points only.In part test, because bubble enters
Propeller works area, deteriorates propeller propulsive efficiency, and the total energy consumption of ship's navigation is caused on the contrary to be increased.Therefore, invention one kind can
To reduce hull bottom bubbles escape and floating, it is to avoid a large amount of bubbles enter the bubble drag-reduction structure in propeller works area, can be gas
The speed-raising and Energy Conservation for steeping drag reduction ship supply technical guarantee, have to the high-speed ship that further genralrlization is based on bubble drag-reduction technology
Significance.
The content of the invention
The invention provides a kind of ship water jet constraint bubble drag-reduction structure, can reduce on drag reduction ship hull bottom bubble
Floating and escape, is that the speed-raising of bubble drag-reduction ship and Energy Conservation supply technical guarantee.
A kind of ship water jet constraint bubble drag-reduction structure, including the air channel of alow leading edge is set, also include：
The rearmounted injection unit of water jet, including two groups of shower nozzles and high service pipeline, the shower nozzle towards stern, two groups of sprays
Head is respectively arranged alow both sides and the length direction along hull is distributed, and forms high-speed water jet to hinder for alow both sides
The only floating of the bubble that the air channel is discharged to hull bottom and escape.
Operation principle of the invention：Compressed air or vessel operation waste gas are continuously injected into hull bottom, edge by air channel
The opposite direction motion of ship's navigation.Simultaneously because the active force such as buoyancy and DIFFUSION IN TURBULENCE, bubble is opened up to diffusion to hull bottom both sides.By
In the rearmounted injection unit of water jet alow both sides produce high-speed water jet, alow left and right edges form strong part and cut
Flow field is cut, there is great velocity gradient in water jet shearing field, prevent the exhibition of bubble to moving and further diverge from ship
Bubble floating and escape that bottom causes, accordingly reduce gas loss and increased hull bottom bubble coverage rate.In water jet shearing
Bubble continues to be close to hull bottom along downstream movement in the presence of flow field, so as to ensure to continue drag reduction on large scale ship length direction
Effect, the compression tolerance needed for reducing bubble drag-reduction again.
Preferably, also include：
The oblique shower nozzle of water jet, arrangement is alow located at propeller front portion, and forming same position in propeller both sides ejects
Twice oblique water-jet propeller works area is entered with the bubble for preventing the air channel from discharging to hull bottom.
The Shearing Flow that the oblique shower nozzle of anterior water jet is formed positioned at propeller works area act as the water conservancy diversion in hull bottom flow field
Structure.Under the constraint of the Shearing Flow that water jet causes, bubble with water jet shearing field outer rim be boundary to the lateral movement of stern two,
Get around propeller and leave hull, it is to avoid a large amount of bubbles are directly entered propeller works region and deteriorate propeller performance.So as to
On the premise of the efficient drag reduction of hull is obtained, the efficiency of propeller is in turn ensure that.
In order to improve bubble drag-reduction effect, it is preferred that the air channel embeds porous media board.Embedded porous media board with
Gas piping is connected, used as continuous air bubbles generator.
Preferably, the shower nozzle uses tapered spout.The quantity of nozzle layout of sprinkler is certain according to ship length and design speed.
Install for convenience and manufacture, it is preferred that the oblique shower nozzle of water jet is using double spout shower nozzles, two folders of spout
Angle is 60 °~120 °, and two directions of spout are respectively in the both sides of propeller.
In order to not influence the flow direction and quantity of bubble, it is preferred that the water sucking mouth of the high service pipeline is arranged on ship
It is anterior.
Manufacture for convenience and install, simplify overall structure, it is preferred that the high service pipeline includes：
Suction hose, installs belowdecks, and water sucking mouth is located at the front of the air channel；
High-pressure hydraulic pump, installs belowdecks, connects suction hose；
Isocon, installs belowdecks, and middle part connects with the delivery port of the high-pressure hydraulic pump, and two ends extend to the two of fore
Side simultaneously extends upwardly to deck of boat top；
Two feed pipes, are separately positioned on the both sides of hull, the two ends delivery port of the isocon respectively with wherein one
Feed pipe is connected；
Playpipe, correspondence shower nozzle is set, and one end connects with the body of feed pipe, and the other end stretches into hull bottom and connects with shower nozzle
Connect.
Manufacture for convenience and install, simplify overall structure, it is preferred that the other end of two feed pipes extends to hull bottom simultaneously
And alow by connecting tube connection, the water inlet of the oblique shower nozzle of water jet is arranged on the middle part of the connecting tube.
Beneficial effects of the present invention：
Water jet constraint bubble drag-reduction technology can operative constraint hull bubble motion, greatly reduce hull bottom bubble along ship
The escape of body both sides, optimizes hull bottom bubble coverage rate, to obtain more preferable drag-reduction effect；Especially for hull big chi more long
Degree ship, drastically increases the lasting drag-reduction effect in boat length direction, effectively reduces its ship resistance.
Brief description of the drawings
Fig. 1 is the structural representation that ship water jet constraint bubble drag-reduction structure of the invention is arranged on hull bottom when on ship
Figure.
Fig. 2 is the schematic elevation view of Fig. 1.
Fig. 3 is the schematic side view of Fig. 1.
Fig. 4 is the structural representation of the shower nozzle of ship water jet constraint bubble drag-reduction structure of the invention.
Fig. 5 is the structural representation of the oblique shower nozzle of water jet of ship water jet constraint bubble drag-reduction structure of the invention.
Specific embodiment
As shown in Fig. 1~5, the ship water jet constraint bubble drag-reduction structure of the present embodiment includes：The ventilation of hull bottom leading edge
Groove 1, high-pressure hydraulic pump 2, the rearmounted shower nozzle 3 of multiple water jets of hull bottom both sides, pipe-line system 4 and the anterior water jet of propeller
Oblique shower nozzle 5, shower nozzle 3 is close to hull bottom installation.
Air channel 1 is close to hull bottom after bow Sonar system or bulb bow, and citation form and plenum system are referred to
Existing bubble drag-reduction ship.
High service pipeline 4 includes：Suction hose 41, installs belowdecks, and water sucking mouth is located at the front of air channel 1, connection
High-pressure hydraulic pump 2；Isocon 42, installs belowdecks, and middle part connects with the delivery port of high-pressure hydraulic pump 2, and two ends extend to fore
Both sides simultaneously extend upwardly to deck of boat top；Two feed pipes 43, are separately positioned on the both sides of hull, the two ends water outlet of isocon 42
Mouth is connected with wherein one feed pipe 43 respectively；Playpipe 44, correspondence shower nozzle 3 is set, and one end connects with the body of feed pipe 43,
The other end stretches into hull bottom and is connected with shower nozzle 3, playpipe 44 install shower nozzle 3 one end to be close to hull bottom and to hull bottom inner side prolong
Stretch；The other end of two feed pipes 43 extended to hull bottom and alow connected by connecting tube 45, and the oblique shower nozzle 5 of water jet enters
The mouth of a river is arranged on the middle part of connecting tube 45.
High service pipeline is pressurizeed, along left and right from fore-body (front side of air channel 1) suction seawater by high-pressure hydraulic pump 2
Side of a ship pipeline is connected respectively to multiple shower nozzles 3 of hull both sides, and the oblique shower nozzle 5 of water jet is connected to finally by hull bottom.Shower nozzle 3 is as schemed
Shown in 4, using gradual shrinkage spout, to increase water jet exit velocity, spout is by being welded to connect hull.The oblique shower nozzle 5 of water jet
As shown in figure 5, two spouts are arranged symmetrically, and 60 °~120 ° of angular range, spout is by being welded and fixed.
In implementation, first according to dimension of ship and structure, the positions and dimensions of air channel 1 are determined.Then, after according to improvement
The target speed of a ship or plane, determines water jet flow velocity, further according to ship length, determines the quantity of the rearmounted shower nozzle 3 of water jet and corresponding
Position.Then, with reference to stern construction and propeller size and location, installation site and the spout folder of the oblique spout 5 of water jet are determined
Angle.High-pressure hydraulic pump, selected jet bilge suction are chosen according to water jet flow velocity and spout water.On the basis of the above, finally
According to the water jet pipe-line system of the pipe-line system form design embodiment of Fig. 1, and it is processed and installs.
In the present embodiment the throughput of air channel 1 and water jet flow velocity need to the matching of the hull target speed of a ship or plane quite it is important,
Before specific implementation, by model experiment and numerical computations, multi-objective optimization design of power need to be carried out according to hull and the target speed of a ship or plane is implemented
Determine above-mentioned parameter best match state.
The operation principle of the present embodiment：Compressed air or vessel operation waste gas are continuously injected into hull bottom by air channel 1,
Moved along the opposite direction of ship's navigation.Simultaneously because the active force such as buoyancy and DIFFUSION IN TURBULENCE, bubble is opened up to diffusion to hull bottom both sides.
Due to the high-speed water jet that water jet rearmounted shower nozzle 3 in hull bottom both sides is produced, alow left and right edges form strong part and cut
Flow field is cut, there is great velocity gradient in water jet shearing field, prevent the exhibition of bubble to moving and further diverge from ship
Bubble floating and escape that bottom causes, accordingly reduce gas loss and increased hull bottom bubble coverage rate.In water jet shearing
Bubble continues to be close to hull bottom along downstream movement in the presence of flow field, so as to ensure to continue drag reduction on large scale ship length direction
Effect, the compression tolerance needed for reducing bubble drag-reduction again.
Meanwhile, the Shearing Flow that the oblique shower nozzle 5 of anterior water jet is formed positioned at propeller works area act as hull bottom flow field
Flow-guiding structure.Under the constraint of the Shearing Flow that water jet causes, bubble with water jet shearing field outer rim be boundary to stern two
Lateral movement, get around propeller and leave hull, it is to avoid a large amount of bubbles are directly entered propeller works region and deteriorate propeller
Energy.So as on the premise of the efficient drag reduction of hull is obtained, in turn ensure that the efficiency of propeller.
Finally it should be noted that listed above is only specific embodiment of the invention.It is clear that the invention is not restricted to
Above example, can also there is many variations.One of ordinary skill in the art can directly lead from present disclosure
The all deformations for going out or associating, are considered as protection scope of the present invention.
Claims (8)
1. a kind of ship water jet constraint bubble drag-reduction structure, including the air channel that alow leading edge is set, it is characterised in that also
Including：
The rearmounted injection unit of water jet, including two groups of shower nozzles and high service pipeline, towards stern, two groups of shower nozzles divide the shower nozzle
Alow both sides not being arranged and the length direction along hull being distributed, high-speed water jet is formed to prevent for alow both sides
State floating and the escape of the bubble that air channel is discharged to hull bottom.
2. ship water jet as claimed in claim 1 constrains bubble drag-reduction structure, it is characterised in that also include：
The oblique shower nozzle of water jet, arrangement is alow located at propeller front portion, and same position is ejected two are formed in propeller both sides
The oblique water-jet in road enters propeller works area to prevent the air channel to the bubble that hull bottom is discharged.
3. ship water jet as claimed in claim 1 constrains bubble drag-reduction structure, it is characterised in that the air channel is embedded more
Hole dielectric-slab.
4. ship water jet as claimed in claim 1 constrains bubble drag-reduction structure, it is characterised in that the shower nozzle is using tapered
Spout.
5. ship water jet as claimed in claim 2 constrains bubble drag-reduction structure, it is characterised in that the oblique shower nozzle of water jet
Using double spout shower nozzles, the angle of two spouts is 60 °~120 °, and two directions of spout are respectively in the both sides of propeller.
6. ship water jet as claimed in claim 2 constrains bubble drag-reduction structure, it is characterised in that the high service pipeline
To be arranged on ship anterior for water sucking mouth.
7. ship water jet as claimed in claim 6 constrains bubble drag-reduction structure, it is characterised in that the high service pipeline
Including：
Suction hose, installs belowdecks, and water sucking mouth is located at the front of the air channel；
High-pressure hydraulic pump, installs belowdecks, connects suction hose；
Isocon, installs belowdecks, and middle part connects with the delivery port of the high-pressure hydraulic pump, and two ends extend to the both sides of fore simultaneously
Extend upwardly to deck of boat top；
Two feed pipes, are separately positioned on the both sides of hull, and the two ends delivery port of the isocon supplies water with wherein one respectively
Pipe is connected；
Playpipe, correspondence shower nozzle is set, and one end connects with the body of feed pipe, and the other end stretches into hull bottom and is connected with shower nozzle.
8. ship water jet as claimed in claim 7 constraint bubble drag-reduction structure, it is characterised in that two feed pipes it is another
End extends to hull bottom and alow by connecting tube connection, the water inlet of the oblique shower nozzle of water jet is arranged on the connecting tube
Middle part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611201166.5A CN106741586B (en) | 2016-12-22 | 2016-12-22 | A kind of ship water jet constraint bubble drag-reduction structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611201166.5A CN106741586B (en) | 2016-12-22 | 2016-12-22 | A kind of ship water jet constraint bubble drag-reduction structure |
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| CN106741586A true CN106741586A (en) | 2017-05-31 |
| CN106741586B CN106741586B (en) | 2019-01-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489704A (en) * | 2018-03-15 | 2018-09-04 | 董恬纲 | Homogeneity linear jet flow substitutes the pressure wave waterr rheostat test device of slender bodies |
| CN110641612A (en) * | 2019-09-27 | 2020-01-03 | 唐旭明 | Self-made hull structure |
| CN112061300A (en) * | 2020-05-25 | 2020-12-11 | 福安阿米山科技有限公司 | Invisible energy-saving emission-reducing ship |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110304193B (en) * | 2019-07-11 | 2020-07-03 | 上海海事大学 | Anti-bubble drag reduction method and system for ship |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108489704A (en) * | 2018-03-15 | 2018-09-04 | 董恬纲 | Homogeneity linear jet flow substitutes the pressure wave waterr rheostat test device of slender bodies |
| CN110641612A (en) * | 2019-09-27 | 2020-01-03 | 唐旭明 | Self-made hull structure |
| CN112061300A (en) * | 2020-05-25 | 2020-12-11 | 福安阿米山科技有限公司 | Invisible energy-saving emission-reducing ship |
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|---|---|
| CN106741586B (en) | 2019-01-04 |
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