CN108674575A - A kind of fluid drag-reduction device - Google Patents
A kind of fluid drag-reduction device Download PDFInfo
- Publication number
- CN108674575A CN108674575A CN201810499660.7A CN201810499660A CN108674575A CN 108674575 A CN108674575 A CN 108674575A CN 201810499660 A CN201810499660 A CN 201810499660A CN 108674575 A CN108674575 A CN 108674575A
- Authority
- CN
- China
- Prior art keywords
- drag
- trepanning
- band
- drag reduction
- reduction band
- Prior art date
- 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.)
- Granted
Links
Classifications
-
- 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
- B63B1/36—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using mechanical means
-
- 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
-
- 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
-
- 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)
- Exhaust Silencers (AREA)
Abstract
The invention discloses a kind of fluid drag-reduction devices, including the drag reduction band on hull periphery or bottom is arranged；The drag reduction band is located in boundary layer；The surface of the drag reduction band is equipped with skin of paint；Drag reduction band is equipped with equidistant trepanning, and L-shaped exhaust pipe is equipped in the trepanning, and one end of the exhaust pipe is inserted into trepanning, and another end opening is towards direction of flow.A kind of fluid drag-reduction device of the present invention is based on Planck boundary layer theoryAnd newton moduleReduce friction coefficient and velocity gradient respectively, reduce the frictional force between ship and water, reduces the use of the energy.
Description
Technical field
The present invention relates to fluid applications more particularly to a kind of fluid drag-reduction devices.
Background technology
Hull generates friction because being contacted with water when the traditional ships such as the low speed ships that transport navigated by water at present and high-speed craft are navigated by water
Resistance, so causing larger energy consumption.The frictional resistance between ship and water is reduced, the research of this respect is people always
Paid attention to.
Invention content
The present invention provides a kind of fluid drag-reduction device, to effectively reduce the frictional force between ship and water.
The technical scheme is that：One fluid drag-reduction device, including the drag reduction band (2) on alow (1) periphery is set；
The drag reduction band (2) is located in boundary layer；The surface of the drag reduction band (2) is equipped with skin of paint；Drag reduction band (2) is equipped with equidistant
Trepanning (21), L-shaped exhaust pipe (22) is equipped in the trepanning；The opening of the exhaust pipe (22) is towards direction of flow.
Further, the drag reduction band (2) is with flexible material.
Further, including the drag reduction band of multiple parallel connections (2)；Trepanning (21) between adjacent drag reduction band (2) be connected into
Row gas supply in parallel.
Further, the diameter of the exhaust pipe (22) is less than the thickness in boundary layer；The exhaust pipe (22) and trepanning
(21) it is interference fitted.
Further, further include sequentially connected gas compressing apparatus, valve, filter and flowmeter, the flow
Meter is connect with drag reduction band (2).
Advantageous effect：A kind of fluid drag-reduction device of the present invention is based on Planck boundary layer theoryWith
Newton moduleReduce friction coefficient and velocity gradient respectively, reduces the friction between ship and water
Power reduces the use of the energy.
Description of the drawings：
Fig. 1 is the vertical view of the present invention；
Fig. 2 is the left view of the present invention；
Fig. 3 is the structural schematic diagram of the drag reduction band of the present invention；
Fig. 4 is the connection diagram of the internal structure of the present invention；
Fig. 5 is the boundary layer velocity figure of the present invention.
Specific implementation mode
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate
It the present invention rather than limits the scope of the invention, after having read the present invention, those skilled in the art are to of the invention each
The modification of kind equivalent form falls within the application range as defined in the appended claims.
As shown in the picture, a kind of fluid drag-reduction device, including the drag reduction band (2) on alow (1) periphery is set；It is described to subtract
Stopband (2) is located in boundary layer；The surface of the drag reduction band (2) is equipped with skin of paint；Drag reduction band (2) is equipped with equidistant trepanning
(21), L-shaped exhaust pipe (22) is equipped in the trepanning；The opening of the exhaust pipe (22) is along direction of flow.
Skin of paint makes the surface of drag reduction band (2) smooth so that the weighting friction coefficient of hull bottom and drag reduction band (2) is less than ship
Bottom-friction factor.Based on according to Planck boundary layer theoryBy installing a friction system additional on hull periphery
Number makes boundary layer less than the drag reduction band (2) of hull bottomWeighted average are to reduce friction coefficient between two kinds of fluids, from
And reduce frictional force.Wherein, ρ∞To come current density, ν∞For speed of incoming flow, CfFor friction coefficient, S is characterized area.
In conjunction with newton moduleFrictional force can be made to become smaller by reducing velocity gradient.μ is viscous for power
Degree,It is speed of incoming flow along the gradient of boundary layer normal direction.
Due to wall surface non-slip condition, in no installation damping device, it is known that fluid velocity is 0 at contact surface.And work as
It has installed the damping device of the present invention additional, has then been no longer equal to 0 along direction of flow injection gas speed at wall surface, speed schematic diagram is such as
Shown in Fig. 5, in this wayIt can reduce, thereforeIt can reduce, and frictional force isτ reduction areas are constant, institute
Reduced with frictional force.
Further, the drag reduction band (2) is with flexible material.So that fitting hull lines, guarantee are placed in boundary
In layer.
Further, including the drag reduction band of multiple parallel connections (2)；Trepanning (21) between adjacent drag reduction band (2) be connected into
Row gas supply in parallel.The gas of parallel connection eruption is more so that frictional force smaller.
Further, the diameter of the exhaust pipe (22) be less than boundary layer thickness, exhaust pipe spray gas it is straight
Diameter is less than boundary layer thickness, and it is bubble destruction boundary layer in order to prevent that bubble diameter, which is less than boundary layer, allows gas can be on boundary
The boundary layer of two kinds of fluid-mixings is mixed to form in layer with water, the friction coefficient of gas is also less than water.Exhaust pipe (22) with open
Hole (21) is interference fitted, i.e., exhaust pipe (22) diameter is slightly larger than aperture, maintains the leakproofness of trepanning, gas can only be from exhaust pipe
(22) alignment direction of flow injection can not overflow to all directions from the gap of exhaust pipe (22) and trepanning (21), influence to subtract
Hinder effect.
Further, further include sequentially connected gas compressing apparatus, valve, filter and flowmeter, the flow
Meter is connect with drag reduction band (2).First gas compression to certain pressure intensity, then opening valve, flowmeter adjustment valve is big according to the observation
Small that gas flow rate is made to be equal to speed of incoming flow, wherein filter effect is the bubble for filtering out diameter and being more than boundary layer.It only needs most
Input port in parallel is connected to together with flowmeter outlet afterwards.
A kind of fluid drag-reduction device of the present invention is based on Planck boundary layer theoryIt rubs in newton
Wipe lawReduce friction coefficient and velocity gradient respectively, reduces the frictional force between ship and water, reduce
The use of the energy.
Claims (5)
1. a kind of fluid drag-reduction device, it is characterised in that：Including the drag reduction band (2) on hull (1) periphery or bottom is arranged；It is described
Drag reduction band (2) is located in boundary layer；The surface of the drag reduction band (2) is equipped with skin of paint；Drag reduction band (2) is equipped with equidistant open
Hole (21), the trepanning is interior to be equipped with L-shaped exhaust pipe (22), and one end of the exhaust pipe (22) is inserted into trepanning (21), another
End opening is along direction of flow.
2. a kind of fluid drag-reduction device according to claim 1, it is characterised in that：The drag reduction band (2) is with flexibility
Material.
3. a kind of fluid drag-reduction device according to claim 1, it is characterised in that：Drag reduction band (2) including multiple parallel connections；
Trepanning (21) connection between adjacent drag reduction band (2) carries out gas supply in parallel.
4. a kind of fluid drag-reduction device according to claim 1, it is characterised in that：The diameter of the exhaust pipe (22) is less than
The thickness in boundary layer；The exhaust pipe (22) is interference fitted with trepanning (21).
5. a kind of fluid drag-reduction device according to claim 1, it is characterised in that：It further include sequentially connected gas compression
Device, valve, filter and flowmeter, the flowmeter are connect with drag reduction band (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499660.7A CN108674575B (en) | 2018-05-23 | 2018-05-23 | Fluid damping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499660.7A CN108674575B (en) | 2018-05-23 | 2018-05-23 | Fluid damping device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108674575A true CN108674575A (en) | 2018-10-19 |
| CN108674575B CN108674575B (en) | 2020-10-27 |
Family
ID=63807981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810499660.7A Expired - Fee Related CN108674575B (en) | 2018-05-23 | 2018-05-23 | Fluid damping device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108674575B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110143254A (en) * | 2019-05-15 | 2019-08-20 | 南京理工大学 | A kind of supercavity generating means |
| CN110282070A (en) * | 2019-06-28 | 2019-09-27 | 哈尔滨工业大学 | A kind of integrated form piezoelectric vibration resistance absorber of embeddable wall surface |
| CN113267321A (en) * | 2021-05-14 | 2021-08-17 | 华北电力大学 | Drag reduction system and method based on photo-thermal bubble bed drag reduction surface |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5456201A (en) * | 1992-01-16 | 1995-10-10 | Bobst; Glen L. | Air bubble lubricated boat hull |
| US20010022152A1 (en) * | 2000-03-14 | 2001-09-20 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Frictional resistance reducing vessel and a method of reducing frictional resistance of a hull |
| CN1363500A (en) * | 2002-02-05 | 2002-08-14 | 周勃 | Jet air-cushion ship with higher speed |
| JP2008018781A (en) * | 2006-07-11 | 2008-01-31 | Mitsui Zosen Akishima Kenkyusho:Kk | Hull friction resistance reducing device |
| CN102202961A (en) * | 2008-11-21 | 2011-09-28 | 三菱重工业株式会社 | Device for reducing frictional resistance of ship body |
| CN102224064A (en) * | 2008-11-21 | 2011-10-19 | 三菱重工业株式会社 | Hull frictional resistance reducing device |
| CN202049100U (en) * | 2010-09-17 | 2011-11-23 | 南京理工大学 | Fluid boundary layer resistance testing balance |
| CN103112547A (en) * | 2012-11-06 | 2013-05-22 | 哈尔滨工程大学 | Ship surface micro-hole jet flow drag reduction structure |
| CN106080954A (en) * | 2016-07-28 | 2016-11-09 | 广船国际有限公司 | A kind of boats and ships electrolysis water tiny bubble damping device |
-
2018
- 2018-05-23 CN CN201810499660.7A patent/CN108674575B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5456201A (en) * | 1992-01-16 | 1995-10-10 | Bobst; Glen L. | Air bubble lubricated boat hull |
| US20010022152A1 (en) * | 2000-03-14 | 2001-09-20 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Frictional resistance reducing vessel and a method of reducing frictional resistance of a hull |
| CN1363500A (en) * | 2002-02-05 | 2002-08-14 | 周勃 | Jet air-cushion ship with higher speed |
| JP2008018781A (en) * | 2006-07-11 | 2008-01-31 | Mitsui Zosen Akishima Kenkyusho:Kk | Hull friction resistance reducing device |
| CN102202961A (en) * | 2008-11-21 | 2011-09-28 | 三菱重工业株式会社 | Device for reducing frictional resistance of ship body |
| CN102224064A (en) * | 2008-11-21 | 2011-10-19 | 三菱重工业株式会社 | Hull frictional resistance reducing device |
| CN202049100U (en) * | 2010-09-17 | 2011-11-23 | 南京理工大学 | Fluid boundary layer resistance testing balance |
| CN103112547A (en) * | 2012-11-06 | 2013-05-22 | 哈尔滨工程大学 | Ship surface micro-hole jet flow drag reduction structure |
| CN106080954A (en) * | 2016-07-28 | 2016-11-09 | 广船国际有限公司 | A kind of boats and ships electrolysis water tiny bubble damping device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110143254A (en) * | 2019-05-15 | 2019-08-20 | 南京理工大学 | A kind of supercavity generating means |
| CN110143254B (en) * | 2019-05-15 | 2021-09-21 | 南京理工大学 | Supercavitation generation device |
| CN110282070A (en) * | 2019-06-28 | 2019-09-27 | 哈尔滨工业大学 | A kind of integrated form piezoelectric vibration resistance absorber of embeddable wall surface |
| CN110282070B (en) * | 2019-06-28 | 2021-11-16 | 哈尔滨工业大学 | Integrated piezoelectric vibration resistance reducer capable of being embedded into wall surface |
| CN113267321A (en) * | 2021-05-14 | 2021-08-17 | 华北电力大学 | Drag reduction system and method based on photo-thermal bubble bed drag reduction surface |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108674575B (en) | 2020-10-27 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201027 Termination date: 20210523 |