CN112109843A - Dynamic resistance reducing device - Google Patents
Dynamic resistance reducing device Download PDFInfo
- Publication number
- CN112109843A CN112109843A CN202011059086.7A CN202011059086A CN112109843A CN 112109843 A CN112109843 A CN 112109843A CN 202011059086 A CN202011059086 A CN 202011059086A CN 112109843 A CN112109843 A CN 112109843A
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- grooves
- base
- air pump
- hole
- communicating
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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
- B63B1/32—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
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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
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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
Abstract
The invention discloses a dynamic resistance reducing device which comprises a base, a plurality of first grooves, first through holes, second through holes, a flexible layer, a plurality of second grooves and a control mechanism, wherein the first grooves are arranged in the base at intervals in sequence and are uniformly distributed; the flexible layer is hermetically attached to the top of the base, and the second grooves are correspondingly positioned in the first grooves one by one; the control mechanism is used for periodically: introducing a medium into the base through the second through hole on one side, and extracting the medium from the base through the second through hole on the other side; so that the second grooves are periodically deformed. According to the dynamic resistance reducing device, the dynamic flexible layer is adopted, so that the resistance reducing effect on turbulence is greatly enhanced; the dynamic flexible layer is controllable in deformation and can be adaptively changed according to different surrounding environments.
Description
Technical Field
The invention relates to the technical field of resistance reduction of skins of underwater vehicles, in particular to a dynamic resistance reducing device.
Background
Turbulent drag reduction is a hot problem for fluid mechanics research. Recent developments in mems technology have provided the possibility for the practical application of active control of drag reduction, in which smart skins with walls that are arbitrarily deformable are considered as key technologies. Inspired by the non-smooth form of the desert surface, the traveling wave surface is taken as a hot structure newly proposed in recent years, a new road is provided for the development of non-smooth surface drag reduction, and more possible choices are provided for the practical application of engineering. However, most of the earlier researches only research the drag reduction effect of the static traveling-wave following wall surface, and the static traveling-wave following wall surface is only effective for a specific situation, has a narrow application range and has a relatively poor drag reduction effect.
Disclosure of Invention
The invention aims to provide a dynamic resistance reducing device, which adopts a dynamic traveling wave wall surface (flexible layer) to greatly enhance the resistance reducing effect on turbulence; the deformation of the wall surface of the traveling wave is controllable, and the adaptive change can be actively made according to different surrounding environments.
In order to achieve the purpose, the invention adopts the technical scheme that:
a dynamic drag reducing device comprising:
the base, a plurality of first grooves which are arranged in the base at intervals, a plurality of first through holes which are arranged on the groove wall of the first groove and are used for communicating the adjacent first grooves, and a plurality of second through holes which are arranged on two sides of the base and are used for communicating the two first grooves on the outermost side in a one-to-one correspondence manner;
the flexible layer and a plurality of second grooves which are arranged at intervals in sequence and are concavely arranged in the flexible layer; the flexible layer is hermetically attached to the top of the base, and the second grooves are correspondingly positioned in the first grooves one by one;
a control mechanism for periodically: introducing a medium into the base through the second through hole on one side, and extracting the medium from the base through the second through hole on the other side; so that the second grooves are periodically deformed.
Preferably, the wall thickness of the second groove is gradually reduced and then gradually thickened along the arrangement direction of the plurality of second grooves; and the surface of the second groove, which is far away from the side of the first groove, is cut off along the arrangement direction of the plurality of second grooves to form a curve, and the curve is a cosine function curve when the second grooves are subjected to periodic deformation.
Preferably, the control mechanism comprises an air pump, a first pipeline communicated between the air pump and the second through hole on one side, a normally closed electromagnetic valve arranged on the first pipeline, a second pipeline communicated between the air pump and the second through hole on the other side, and a normally open electromagnetic valve arranged on the second pipeline;
the normally closed electromagnetic valve is used for communicating the atmosphere with the air pump when closed and is also used for communicating the second through hole with the air pump when opened;
the normally open solenoid valve is used for communicating the air pump with the second through hole when opened and is also used for communicating atmosphere with the air pump when closed.
More preferably, the control mechanism further comprises a pressure relief valve communicated between the air pump and the normally closed solenoid valve.
More preferably, the control mechanism further comprises a first time relay for controlling the normally closed solenoid valve to be periodically energized, and a second time relay for controlling the normally open solenoid valve to be periodically energized.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the dynamic resistance reducing device has the following advantages that:
compared with the existing static resistance-reducing skin, the periodically fluctuating skin surface appearance can further change the flow field around the skin surface by adopting the dynamic traveling wave wall surface, so that the formation and development of turbulence are influenced, the secondary turbulence is restrained, and the resistance-reducing effect of the dynamic traveling wave wall surface is better improved compared with that of the static resistance-reducing skin;
through the shape to first recess, the thickness of second recess and to the control of pressure flow when the medium is periodically pumped, can adjust the surface form of second recess periodic deformation to make adaptability change to different environment initiatively around.
Drawings
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 2 is a schematic structural view of a flexible layer;
FIG. 3 is a schematic structural view of a control mechanism in embodiment 1;
fig. 4 is a schematic view of a cosine curve function formed when the outer surface of the flexible layer is maximally deformed in a certain dynamic period when the flexible layer works in embodiment 1.
Wherein: 1. a base; 2. a first groove; 3. a first through hole; 4. a second through hole; 5. a flexible layer; 6. a second groove; 7. an air pump; 8. a first conduit; 9. a normally closed solenoid valve; 10. a second conduit 0; 11. a normally open solenoid valve; 12. a pressure relief valve; 13. a first time relay; 14. a second time relay.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Referring to fig. 1-2, the dynamic damping device includes a base 1 and a flexible layer 5 connected to each other, and a control mechanism for controlling the flexible layer 5 to make periodic fluctuation in the base 1.
The dynamic damping device further comprises a plurality of first grooves 2 which are arranged in the base 1 at intervals and are arranged uniformly in sequence, first through holes 3 which are arranged on the groove wall of the first grooves 2 and are used for communicating the adjacent first grooves 2, and second through holes 4 which are arranged on two sides of the base 1 and are used for communicating the two outermost first grooves 2 in a one-to-one correspondence manner. Referring to fig. 1, in this embodiment, there are four first grooves 2, a plurality of first through holes 3 are respectively formed on two side groove walls of the two inner first grooves 2, and second through holes 4 are correspondingly formed on outer side groove walls of the two outer first grooves 2. In this embodiment, the base 1 is a rectangular box-shaped frame, and 304 stainless steel is selected to ensure the strength thereof.
The dynamic damping device further comprises a plurality of second grooves 6 which are arranged in the flexible layer 5 at intervals and are arranged in sequence and are concavely arranged. The flexible layer 5 consists of a planar portion and a second recess 6. The plane part of the flexible layer 5 is hermetically attached to the top of the base 1 (for example, bonded by strong glue), and the shape and the size of the plane part are the same as those of the top plane of the base 1; the second grooves 6 are correspondingly positioned in the first grooves 2. The plane parts and the second grooves 6 are regularly arranged periodically, the second grooves 6 and the plane parts on the adjacent sides form a period, and the period number and the size of the base 1 matched with the period number are set according to actual needs. In this embodiment the flexible layer 5 is made of a rubber material to meet the corrosion resistance and durability requirements for underwater operation.
The dynamic damping device further comprises a control mechanism. The control mechanism is used for periodically: and introducing a medium into the base 1 through the second through hole 4 on one side, and extracting the medium from the base 1 through the second through hole 4 on the other side. So that the second grooves 6 in the first grooves 2 are periodically deformed by the medium. In other embodiments, the control mechanism may control the medium to be introduced into the base 1 or to be extracted from the base 1.
The wall thickness of the second groove 6 is gradually reduced and then gradually increased along the arrangement direction of the plurality of second grooves 6. The surface of the second groove 6 on the side away from the first groove 2 (i.e., the outer surface of the second groove 6) is a curve formed by cutting along the arrangement direction of the plurality of second grooves 6, and the curve is a cosine function curve when the second groove 6 is subjected to periodic deformation.
Through the shape of the first groove 2, the thickness of the second groove 6 and the control of the pressure flow during the periodic pumping of the medium, the surface form of the periodic deformation of the second groove 6 can be adjusted (namely, the curve is expressed as different cosine curve functions) so as to actively make adaptive changes according to different surrounding environments.
The medium may be a liquid medium or a gaseous medium, which is normally distributed in the base 1, i.e. in all the first recesses 2.
Referring to fig. 3, in embodiment 1, the control mechanism includes an air pump 7, a first pipe 8 communicated between the air pump 7 and the second through hole 4 on one side, a normally closed solenoid valve 9 disposed on the first pipe 8, a second pipe 10 communicated between the air pump 7 and the second through hole 4 on the other side, and a normally open solenoid valve 11 disposed on the second pipe 10. In the present embodiment, the control mechanism further includes a relief valve 12 communicating between the air pump 7 and the normally closed electromagnetic valve 9, and the air displacement of the air pump 7 is regulated to the air displacement demand value of the specific frequency by the relief valve 12. In this embodiment, the inner diameters of the first and second pipes 8 and 10 are 12mm, and the working flow rate of the air pump 7 is 140L/min, which can perform pressurization at 0.3 MPa. In other embodiments, when the medium is a liquid, the air pump 7 is an infusion pump, which is also used to pump the liquid into the base 1.
The normally closed electromagnetic valve 9 and the normally open electromagnetic valve 11 are three-way electromagnetic valves. The normally closed electromagnetic valve 9 is used for communicating the atmosphere with the air pump 7 when closed and is also used for communicating the second through hole 4 with the air pump 7 when opened; the normally open electromagnetic valve 11 is used for communicating the air pump 7 with the second through hole 4 when opened, and is also used for communicating the atmosphere with the air pump 7 when closed.
With this arrangement, when gas is introduced into the base 1, the gas passage is: atmosphere-normally closed electromagnetic valve 9 (closed) -pressure relief valve 12-air pump 7-normally open electromagnetic valve 11 (open) -base 1; when gas is extracted from the base 1, the gas passages are: the base 1, the normally closed electromagnetic valve 9 (open), the pressure relief valve 12, the air pump 7, the normally open electromagnetic valve 11 (close) and the atmosphere.
In the embodiment, the control mechanism further comprises a first time relay 13 for controlling the normally closed electromagnetic valve 9 to be periodically electrified and a second time relay 14 for controlling the normally open electromagnetic valve 11 to be periodically electrified. The two time relays are used for respectively controlling the two electromagnetic valves to enable the two electromagnetic valves to be in specific opening and closing frequencies.
The air pump 7 is controlled by an electromagnetic valve connected with a time relay to integrally intake and exhaust the base 1 and the flexible layer 5, and the exhaust volume of the air pump 7 is controlled by a pressure relief valve 12, so that the air pressure and the air volume in the base 1 are periodically changed, and the flexible layer 5 is in a surface form similar to wave motion.
Referring to fig. 4, a cosine function curve formed when the outer surface of the flexible layer 5 is maximally deformed in a certain dynamic period in operation in example 1 is shown, and the outer surface of the flexible layer 5 exhibits a wavy motion with a certain flat interval, wherein a period length of the cosine function is 60mm, a length of the platform between two second grooves 6 is 20mm, and a height difference between a lowest point of the cosine function curve and the platform is 4mm when the outer surface is maximally deformed. Multiple simulation experiments prove that the drag reduction effect of the device is better under the cosine function curve.
The above-mentioned embodiments are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (5)
1. A dynamic damping device is characterized in that: the method comprises the following steps:
the base, a plurality of first grooves which are arranged in the base at intervals, a plurality of first through holes which are arranged on the groove wall of the first groove and are used for communicating the adjacent first grooves, and a plurality of second through holes which are arranged on two sides of the base and are used for communicating the two first grooves on the outermost side in a one-to-one correspondence manner;
the flexible layer and a plurality of second grooves which are arranged at intervals in sequence and are concavely arranged in the flexible layer; the flexible layer is hermetically attached to the top of the base, and the second grooves are correspondingly positioned in the first grooves one by one;
a control mechanism for periodically: introducing a medium into the base through the second through hole on one side, and extracting the medium from the base through the second through hole on the other side; so that the second grooves are periodically deformed.
2. The dynamic drag reducing device of claim 1, wherein: the wall thickness of the second grooves is gradually reduced and then gradually thickened along the arrangement direction of the plurality of second grooves; and the surface of the second groove, which is far away from the side of the first groove, is cut off along the arrangement direction of the plurality of second grooves to form a curve, and the curve is a cosine function curve when the second grooves are subjected to periodic deformation.
3. The dynamic drag reducing device of claim 1, wherein: the control mechanism comprises an air pump, a first pipeline communicated between the air pump and the second through hole on one side, a normally closed electromagnetic valve arranged on the first pipeline, a second pipeline communicated between the air pump and the second through hole on the other side, and a normally open electromagnetic valve arranged on the second pipeline;
the normally closed electromagnetic valve is used for communicating the atmosphere with the air pump when closed and is also used for communicating the second through hole with the air pump when opened;
the normally open solenoid valve is used for communicating the air pump with the second through hole when opened and is also used for communicating atmosphere with the air pump when closed.
4. A dynamic drag reducing device according to claim 3, characterized in that: the control mechanism further comprises a pressure relief valve communicated between the air pump and the normally closed electromagnetic valve.
5. A dynamic drag reducing device according to claim 3, characterized in that: the control mechanism further comprises a first time relay for controlling the normally closed electromagnetic valve to be periodically electrified and a second time relay for controlling the normally open electromagnetic valve to be periodically electrified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011059086.7A CN112109843B (en) | 2020-09-30 | 2020-09-30 | Dynamic resistance reducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011059086.7A CN112109843B (en) | 2020-09-30 | 2020-09-30 | Dynamic resistance reducing device |
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| Publication Number | Publication Date |
|---|---|
| CN112109843A true CN112109843A (en) | 2020-12-22 |
| CN112109843B CN112109843B (en) | 2022-03-08 |
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| CN202011059086.7A Active CN112109843B (en) | 2020-09-30 | 2020-09-30 | Dynamic resistance reducing device |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB108318A (en) * | 1916-07-21 | 1918-05-23 | Antoine Padoue Filippi | Improvements in Means for Reducing the Resistance to Propulsion of Ships and other Marine Vessels. |
| DE10314057B3 (en) * | 2003-03-28 | 2004-05-19 | Gabler Maschinenbau Gmbh | Snorkel device for a submarine comprises a vertically extending head unit consisting of a column containing a fresh air tube and an exhaust gas tube and provided along its water flow |
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2020
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| CN101574996A (en) * | 2008-05-08 | 2009-11-11 | 林瑞麟 | Method for reducing frictional resistance of ship body and water by using gas release in water |
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| CN103112547A (en) * | 2012-11-06 | 2013-05-22 | 哈尔滨工程大学 | Ship surface micro-hole jet flow drag reduction structure |
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| CN107304779A (en) * | 2016-04-18 | 2017-10-31 | 南京理工大学 | The electromagnetism rib composite anti-drag device controlled for sail body turbulent boundary layer |
| CN106945782A (en) * | 2017-04-10 | 2017-07-14 | 江苏科技大学 | The drag reduction surface under water and preparation method of a kind of imitative filefish epidermis morphology |
| CN108177724A (en) * | 2018-01-12 | 2018-06-19 | 中船重工船舶设计研究中心有限公司 | A kind of voltage stabilizing cavity configuration and installation method for resistance reduction by air cavity technology |
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