CN108545145A - A kind of flow control method inhibiting underwater sailing body works surface cavitation phenomenon - Google Patents
A kind of flow control method inhibiting underwater sailing body works surface cavitation phenomenon Download PDFInfo
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- CN108545145A CN108545145A CN201810614437.2A CN201810614437A CN108545145A CN 108545145 A CN108545145 A CN 108545145A CN 201810614437 A CN201810614437 A CN 201810614437A CN 108545145 A CN108545145 A CN 108545145A
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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
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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
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- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a kind of flow control method inhibiting underwater sailing body works surface cavitation phenomenon, lift-off works is fixed at a certain distance from underwater sailing body works surface by the method, and specific fixed position is at least one kind in following situations：A：The nascent position upstream control of vacuole；B：Vacuole controls at nascent position；C：The internal control of vacuole area；D：Vacuole retro-reflective position controls；E：Vacuole downstream controls.The present invention installs lift-off works by sail body works surface under water, on the one hand hindering incoming, the local of sail body works surface accelerates under water, increase the pressure positioned at lift-off works upstream region, cavitation phenomenon even is eliminated to achieve the purpose that postpone；On the other hand it by generating cavitation in lift-off works back side, is equivalent to and cavitation area is transferred on lift-off works, to improve the cavitation phenomenon of underwater sailing body works.
Description
Technical field
The present invention relates to a kind of flow control method of suppression cavitation more particularly to a kind of inhibition underwater sailing body works
The flow control method of surface cavitation phenomenon.
Background technology
By taking hydrofoil as an example, in order to control underwater sailing body works surface cavitation phenomenon, improve its hydrodynamic force spy to reach
Property, reduce cavitation corrosion and reduce the purpose of hydrodynamic noise, existing cavitation suppression technology includes mainly：Hydrodynamic force profile optimization,
Local roughness surface, barrier strand structure and jet stream.Above-mentioned cavitation suppression technology there is a problem of certain：
Although 1, can be weakened under certain cavitation number to elimination cavitation phenomenon using the method for hydrofoil hydrodynamic force profile optimization,
It is that its control effect is limited.
2, local roughness surface is easy contaminated object covering and is washed away and worn and effect out of hand by incoming.
3, then it is mainly used for controlling retroeflection and the obscission of vacuole using barrier strand structure, to cavitation inception phenomenon
Control effect is limited, and since the above barrier strand structure is often locally protruding on hydrofoil surface, certain to will produce
Additional drag, and structural reliability is relatively low, such as falls off.
4, local groove structure can weaken hydrofoil structural strength, and thicken hydrofoil then often so that its hydrodynamic characterisitic is notable
Decline.
5, fluidics then needs special gas supply or water supply pipe, and complicated pipeline is especially arranged inside hydrofoil
When, structural strength is greatly reduced, and structural reliability is difficult to ensure, and pipe-line system also needs and drive system（Such as motor, pump
Deng）Combination, system are complex.
With the raising of hydrofoil local velocity and the decline of pressure, surface locally even large-scale cavitation will occurs and show
As its hydrodynamic characterisitic, structural reliability and Stealth will be significantly affected.Vacuole retroeflection phenomenon makes local pressure mistake
Greatly, it generates local cavitation corrosion and material peels off, the retroeflection stream impact phenomenon generated when especially cavitation size is larger can even cause
Serious malformation and destruction.The cavitation phenomenon on hydrofoil surface can also make its hydrodynamic force and operating torque be substantially reduced.This
Outside, since the unsteady vacuole group in the unsteady development of vacuole, especially vacuole tail portion falls off and eddy structure, it can also make water
There is larger pressure fluctuation phenomenon in flow field around it in the wing, and then generates hydrodynamic noise, reduces its hidden acoustic performance.Therefore, such as
It is always in the important research in the fields such as naval vessel, submarine, Underwater Battery and unmanned submersible that, which avoids and weaken cavitation phenomenon,
One of hold, there is larger theory value and engineering significance.
Invention content
In order to eliminate or weaken the cavitation phenomenon on underwater sailing body works surface, inhibiting underwater the present invention provides a kind of
The flow control method of sail body works surface cavitation phenomenon installs lift-off structure by sail body works surface under water
Object, on the one hand hindering incoming, the local of sail body works surface accelerates under water, increases and is located at lift-off works upstream region
Pressure, to achieve the purpose that postpone even be eliminated cavitation phenomenon；On the other hand by being generated in lift-off works back side
Cavitation is equivalent to and cavitation area is transferred on lift-off works, to improve the cavitation phenomenon of underwater sailing body works.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of flow control method inhibiting underwater sailing body works surface cavitation phenomenon, lift-off works is fixed on away from water
At a certain distance from lower sail body works surface, which should be less than 10 times that lift-off works edge flows to characteristic length, distance
After the numerical value, lift-off works will not have an impact sail body works surface flow.Specific fixed position is extremely
It is one kind in following situations less：
A：The nascent position upstream control of vacuole
Lift-off works is fixed on the nascent position upstream region of underwater sailing body works vacuole and away from underwater sailing body works
The distance of wall surface is less than 10 times that lift-off works edge flows to characteristic length；
B：Vacuole controls at nascent position
Lift-off works is fixed on the region with the nascent same axial position of underwater sailing body works vacuole and away from underwater navigation
The distance of body works wall surface is less than 10 times that lift-off works edge flows to characteristic length；
C：The internal control of vacuole area
Lift-off works is fixed on underwater sailing body works cavitating region and distance away from underwater sailing body works wall surface is small
10 times of characteristic length are flowed in lift-off works edge；
D：Vacuole retro-reflective position controls
Lift-off works be fixed on underwater sailing body works vacuole tail region and away from underwater sailing body works wall surface away from
10 times of characteristic length are flowed to from less than lift-off works edge；
E：Vacuole downstream controls
Lift-off works be fixed on underwater sailing body works vacuole tail portion downstream and away from underwater sailing body works wall surface away from
10 times of characteristic length are flowed to from less than lift-off works edge.
In the present invention, the lift-off works is mounted on using identical or different lift-off works parameter away from underwater navigation
It body works different distance and different flows at position.
In the present invention, the lift-off works parameter include lift-off works shape, size, material, along flow direction position,
Distance away from underwater sailing body works surface.
In the present invention, the works with any geometry may be used in the lift-off works, such as rectangular, round,
The lift-off works of oval, prismatic, streamline profile and other geometric formats, any shape structure is suitable for this hair
It is bright.
In the present invention, the lift-off works is not limited to material forms, and rigidity, flexible material even porous Jie can be used
The lift-off works of material etc., any material form is suitable for the present invention.
In the present invention, the lift-off works can be used any mounting means and be fixed on away from underwater sailing body works surface
The position of certain distance.
In the present invention, the lift-off works is using single or multiple works simultaneously mounted on away from underwater sailing body knot
It structure object different distance and different flows at position.
In the present invention, the lift-off works is mounted on underwater navigation using the array combination mode of different shape and size
It body works different distance and different flows at position.
In the present invention, the array combination mode is one or more of following manner：The array of different shape size
It combines, the array combination of different materials lift-off works.
In the present invention, the lift-off works is applicable not only to hydrofoil surface, is equally applicable to underwater sailing body in addition to water
Other structures object surface other than the wing, achievees the purpose that suppression cavitation.
In the present invention, any type of underwater sailing body works inhibits its cavitation phenomenon suitable using lift-off works
Method for the present invention.
Compared with the existing technology, the invention has the advantages that：
1, when extent of cavitation is smaller, the present invention can be significantly improved using the inhibition of lift-off works and be navigated under its upper water
The local pressure on row body works surface reduces fluid velocity, to avoid cavitation phenomenon completely.
2, when cavitation is more violent, the present invention hinders upstream fluid speed by lift-off works and improves part pressure
Power, the effective nascent position for postponing underwater sailing body works surface cavitation.
3, the present invention reduces the volume of vacuole using the inhibition of lift-off works, can effectively reduce vacuole tail portion
Retroeflection impact, and then weaken retroeflection stream to the cavitation corrosion effect of underwater sailing body works surface local material.
4, the present invention increases high speed underwater sailing body knot by the cavitation area range on reduction underwater sailing body works surface
The wetted surface of structure object is equivalent to and improves its controllability and stability.
5, the present invention reduces the cavitation phenomenon on underwater sailing body works surface using lift-off works, can weaken or keep away
Exempt from falling off for a wide range of cloud vacuole, on the one hand reduce the hydrodynamic unsteady fluctuation of underwater sailing body works, on the other hand
Reduce or avoid the unsteady caused hydrodynamic noise that falls off of vacuole.
6, the present invention can be adopted with traditional suppression cavitation technical compatibility that is, after using other flow control techniques
The cavitating flows phenomenon of underwater sailing body works is further eliminated or inhibited with the technology.
7, the lift-off works geometric shape and material that the present invention uses are without specifically limited, combinable different underwater navigation
Body works optimizes layout, has stronger engineering adaptability.
8, lift-off works of the invention is simple in structure, and installation fixed form is various, can be after its destruction（Such as due to lift-off
The cavitation phenomenon of works back side, the serious cavitation corrosion after it works long hours）Individually replace the lift-off works, be equivalent to by
Cavitation and cavitation corrosion are transferred on lift-off works, to protect the structure of underwater sailing body works.
9, the present invention is suitable for the water of the sail body of above water craft, speedboat, submarine, underwater sailing body, unmanned submersible etc.
In the wing, control vane and other surfaces, to achieve the purpose that suppression cavitation.
Description of the drawings
Fig. 1 is lift-off works（By taking cylinder as an example）Arrangement in hydrofoil suction surface side；
Fig. 2 is cavitation number, and whether there is or not lift-off works when being 1.0（By taking cylinder as an example）The vacuole of control compares,（a）Without control,（b）
There is the control of lift-off cylinder；
Fig. 3 is cavitation number, and whether there is or not lift-off works when being 1.2（By taking cylinder as an example）The vacuole of control compares,（a）Without control,（b）
There is the control of lift-off cylinder.
Specific implementation mode
Technical scheme of the present invention is further described below in conjunction with the accompanying drawings, however, it is not limited to this, every to this
Inventive technique scheme is modified or replaced equivalently, and without departing from the spirit of the technical scheme of the invention and range, should all be covered
In protection scope of the present invention.
By taking hydrofoil as an example, the present invention is in order to eliminate or weaken the cavitation phenomenon on underwater sailing body works surface, by lift-off
Works is mounted near the solid wall surface of hydrofoil, and cylinder, square column, cylindroid, the streamlined wing can be used in the lift-off works
Type and structure with other geometric properties, can effectively inhibiting lift-off works, nearby hydrofoil consolidates the cavitating flows of wall surface
Phenomenon.Specific embodiment includes following several：
Scheme 1：The nascent position upstream control of vacuole
Lift-off works is placed in cavitation inception position upstream.As shown in Figure 1, the structure includes lift-off works 1, hydrofoil
2, lift-off works 1 uses cylindrical structure, lift-off works 1 to be fixed on hydrofoil 2 and consolidate the nascent position upstream region of 3 vacuole of wall surface
A and distance away from solid wall surface 3 are less than lift-off works along flowing to 10 times of characteristic length, are postponed by reducing upstream speed
Or inhibit the cavitation inception on 2 surface of hydrofoil.
Scheme 2：Vacuole controls at nascent position
Lift-off works is placed near cavitation inception position.As shown in Figure 1, lift-off works 1, which is fixed on hydrofoil 2, consolidates wall table
The neighbouring B of the nascent same axial position of 3 vacuole of face and the distance away from solid wall surface 3 are less than lift-off works edge and flow to characteristic length
10 times, it is directly changed the speed and pressure in cavitation inception region, postpones or suppression cavitation is nascent.
Scheme 3：The internal control of vacuole area
Lift-off works is placed near hydrofoil cavitation internal face.As shown in Figure 1, lift-off works 1 is fixed on 2 Gu Bi of hydrofoil
Surface 3 corresponds to cavitating region C nearby and the distance away from solid wall surface 3 is less than 10 times that lift-off works edge flows to characteristic length,
The partial high pressure generated by fluid impact cylinder is local reducing vacuole internal speed, improve local pressure, weakening or eliminating
Cavitation, and influence the vacuole tail portion retroeflection in downstream and phenomena such as falling off.
Scheme 4：Vacuole retro-reflective position controls
Lift-off works is placed near vacuole tail portion.As shown in Figure 1, lift-off works 1, which is fixed on hydrofoil 2, consolidates wall surface 3
It corresponds to D at vacuole tail portion and near zone position and the distance away from solid wall surface 3 flows to characteristic length less than lift-off works edge
10 times, by lift-off works 1 reduce hydrofoil surface cavitation fall off and the shock loading and hydrodynamic noise during retroeflection.
Scheme 5：Vacuole downstream controls
Lift-off works is placed in vacuole downstream.As shown in Figure 1, lift-off works 1, which is fixed on hydrofoil 2, consolidates the correspondence of wall surface 3
Vacuole tail portion downstream near wall E and distance away from solid wall surface 3 are less than lift-off works along flowing to 10 times of characteristic length, lead to
It crosses lift-off works 1 and hinders the flowing of its upstream, influence falling off for vacuole tail portion, reduce the pressure arteries and veins in the vacuole evolution that falls off
It is dynamic, reduce hydrodynamic noise.
Scheme 6：The multiple lift-off cylinder combination controls of different zones
For the control method for consolidating placement lift-off works 1 near wall surface 3 in above scheme 1 to scheme 5 in hydrofoil 2, can adopt
Consolidate near wall surface 3 the flowing controlling party for disposing lift-off works 1 in hydrofoil 2 with the combination in two or more regions of any of the above
Method.
Scheme 7：The combination of different size and structure type lift-off cylindrical structure object controls
According to cavitation zone flow control parameter difference, can hydrofoil 2 consolidate 3 subregion of wall surface or segmentation use it is identical or
The flowing control program of different lift-off works parameters, wherein lift-off works parameter include：Shape, size, length and material
Material etc..
Scheme 8：The combination of different lift-off works arrangement forms controls
According to the difference for flowing control parameter to cavitation zone, lift-off knot of the wall surface 3 using a variety of arrays can be consolidated in hydrofoil 2
Structure object 1 disposes control program, includes the array combination etc. of the array combination of different shape size, different lift-off works 1.It can adopt
Control programs are combined with various be staggered, and the lift-off works control unit parameter in scheme 1 to scheme 7 can be all made of battle array
Column lift-off works 1 disposes.
Said program is placed in using lift-off works near the solid wall surface of hydrofoil, using lift-off works to flow
Inhibition reduces near wall flow velocity, can effectively improve the pressure on hydrofoil surface, and then can reach following purpose：
1, since nearby local flow is hindered hydrofoil by lift-off works, flow velocity reduces, pressure rise, can be effectively reduced and
Flow cavitation inception number；
2, when generating cavitation phenomenon, lift-off works can effectively reduce the volume of vacuole；
3, since lift-off works itself has blocking effect, the compression shock during can substantially reducing bubble retroeflection and falling off
And the flow noise generated in this process；
4, lift-off works itself can generate apparent vacuole, absorb a large amount of cavitation nucleus, to reduce hydrofoil or sail body surface
Neighbouring cavitation nuclear volume achievees the purpose that control hydrofoil surface cavitation；
5, the technology can be used that is, after using other flow control techniques with traditional suppression cavitation technical compatibility
Further eliminate or inhibit hydrofoil and the cavitating flows phenomenon on other works surfaces.
Fig. 2 and Fig. 3 gives uses the schematic diagram of cylindrical structure lift-off works suppression cavitation on certain hydrofoil surface, wherein
Lift-off body diameter is 1mm, and hydrofoil chord length is 70mm, and distance of the lift-off cylinder away from hydrofoil suction surface surface is 1.5mm, lift-off circle
For column in an axial direction away from leading edge 10mm, compared cavitation number is 1.0 and 1.2 times its control effects to flowing.
By Fig. 2 and Fig. 3 it is found that after using lift-off cylinder, hydrofoil surface cavitation size is obviously reduced, backwater after lift-off cylinder
Face produces cavitation phenomenon, is equivalent to and the cavitation on hydrofoil surface has been transferred on lift-off cylinder.
Claims (10)
1. a kind of flow control method inhibiting underwater sailing body works surface cavitation phenomenon, it is characterised in that the method will
Lift-off works is fixed at a certain distance from underwater sailing body works surface, and specific fixed position is at least following situations
In one kind：
A：The nascent position upstream control of vacuole
Lift-off works is fixed on the nascent position upstream region of underwater sailing body works vacuole and away from underwater sailing body works
The distance of wall surface is less than 10 times that lift-off works edge flows to characteristic length；
B：Vacuole controls at nascent position
Lift-off works is fixed on the region with the nascent same axial position of underwater sailing body works vacuole and away from underwater navigation
The distance of body works wall surface is less than 10 times that lift-off works edge flows to characteristic length；
C：The internal control of vacuole area
Lift-off works is fixed on underwater sailing body works cavitating region and distance away from underwater sailing body works wall surface is small
10 times of characteristic length are flowed in lift-off works edge；
D：Vacuole retro-reflective position controls
Lift-off works be fixed on underwater sailing body works vacuole tail region and away from underwater sailing body works wall surface away from
10 times of characteristic length are flowed to from less than lift-off works edge；
E：Vacuole downstream controls
Lift-off works be fixed on underwater sailing body works vacuole tail portion downstream and away from underwater sailing body works wall surface away from
10 times of characteristic length are flowed to from less than lift-off works edge.
2. the flow control method according to claim 1 for inhibiting underwater sailing body works surface cavitation phenomenon, special
Sign is that the lift-off works is mounted on away from underwater sailing body works not using identical or different lift-off works parameter
It same distance and different flows at position.
3. the flow control method according to claim 2 for inhibiting underwater sailing body works surface cavitation phenomenon, special
Sign be the lift-off works parameter include lift-off works shape, size, material, along flow direction position, away from underwater navigation
The distance on body works surface.
4. the flow control method according to claim 3 for inhibiting underwater sailing body works surface cavitation phenomenon, special
Sign is that the shape of the lift-off works is using the works with any geometry.
5. the flow control method according to claim 4 for inhibiting underwater sailing body works surface cavitation phenomenon, special
Sign is that the shape of the lift-off works is rectangular, round, oval, prismatic, streamline profile or other geometric formats.
6. the flow control method according to claim 3 for inhibiting underwater sailing body works surface cavitation phenomenon, special
Sign is the material of the lift-off works using one or more of rigid material, flexible material, porous media material.
7. the flow control method according to claim 3 for inhibiting underwater sailing body works surface cavitation phenomenon, special
Sign is that the lift-off works is fixed on the position away from underwater sailing body works surface certain distance using any mounting means
It sets.
8. the flow control method according to claim 3 for inhibiting underwater sailing body works surface cavitation phenomenon, special
Sign be the lift-off works be mounted on simultaneously using single or multiple works away from underwater sailing body works difference away from
It is flowed at position from different.
9. the flow control method according to claim 3 for inhibiting underwater sailing body works surface cavitation phenomenon, special
Sign is that the lift-off works is mounted on underwater sailing body works not using the array combination mode of different shape and size
It same distance and different flows at position.
10. the flow control method according to claim 9 for inhibiting underwater sailing body works surface cavitation phenomenon, special
Sign is that the array combination mode is one or more of following manner：The array combination of different shape size, different materials
Expect the array combination of lift-off works.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111409808A (en) * | 2020-04-03 | 2020-07-14 | 武汉理工大学 | Electrical push flat-bottom cargo ship resistance reduction energy-saving control system based on neural network algorithm |
| CN114001922A (en) * | 2021-12-02 | 2022-02-01 | 中国船舶科学研究中心 | Two-phase flow control method for slender body with smooth head |
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| DE202016005658U1 (en) * | 2016-09-15 | 2017-12-18 | Klaus Willmann | Impact force reducing flow deflector for the flowed base of flow bodies |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB373970A (en) * | 1930-08-01 | 1932-06-02 | Henri Lecoq | Improvements in or relating to means for reducing frictional resistance of fluids along solid walls |
| US4003325A (en) * | 1975-03-24 | 1977-01-18 | Allen Rudolph A | Cargo vessel low resistance bow |
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| CN111409808A (en) * | 2020-04-03 | 2020-07-14 | 武汉理工大学 | Electrical push flat-bottom cargo ship resistance reduction energy-saving control system based on neural network algorithm |
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