CN113200119A - Drag reduction surface structure of underwater vehicle shell - Google Patents
Drag reduction surface structure of underwater vehicle shell Download PDFInfo
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- CN113200119A CN113200119A CN202110371698.8A CN202110371698A CN113200119A CN 113200119 A CN113200119 A CN 113200119A CN 202110371698 A CN202110371698 A CN 202110371698A CN 113200119 A CN113200119 A CN 113200119A
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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
- B63B1/40—Other means for varying the inherent hydrodynamic characteristics of hulls by diminishing wave resistance
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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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- 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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Abstract
The invention discloses a drag reduction surface structure of an underwater vehicle shell, which comprises a feather-shaped drag reduction structure array arranged on the underwater vehicle shell, wherein the feather-shaped drag reduction structure array is asymmetrically distributed on the upper surface and the lower surface of the underwater vehicle shell, and the asymmetrical distribution is one or a combination of asymmetrical structures, asymmetrical structure sizes or asymmetrical arrangement modes of the feather-shaped drag reduction structure array on the upper surface and the lower surface of the underwater vehicle shell; the feather-shaped drag reduction structures forming the feather-shaped drag reduction structure array comprise a feather shaft structure and feather branch structures, wherein the feather shaft structure is arranged along the surface fluid flow direction of the outer shell of the aircraft, and the feather branch structures are distributed on two sides of the feather shaft structure in the downstream direction. The asymmetric underwater vehicle surface can effectively reduce the frictional resistance between the vehicle and water, achieve the beneficial effects of energy conservation and emission reduction, and improve the navigation stability of the vehicle.
Description
Technical Field
The invention belongs to the field of hydrodynamics, particularly relates to a surface structure, and particularly relates to a drag reduction surface structure of an underwater vehicle hull.
Background
The underwater vehicle is a navigation body navigating underwater, comprises a manned underwater vehicle and an unmanned underwater vehicle, and can complete underwater exploration, detection, even attack and defense in military and other tasks. At present, where ocean development is increasingly important, underwater vehicles are gaining more and more attention from various countries, playing an important role both in civilian use and military use. However, when navigating in the ocean, the hydrodynamic drag and noise are generated due to the interaction with the flow of the sea, which leads to the reduction of the navigation speed and the fighting performance of the underwater weapons.
The existing drag reduction technology of the aircraft is generally groove surface turbulence drag reduction, a flexible surface method, a micro-bubble method, hydrophobic drag reduction and the like, and breaks through the traditional thinking mode that the smoother surface is, the smaller the drag is. When the traditional drag reduction technology is applied to the surface of a vehicle, the vehicle is often in a symmetrical structure, the effect is not satisfactory, and the current navigation resistance of the vehicle is still large. Therefore, how to break through the traditional drag reduction technology acting on the surface of the aircraft and further reduce the navigation resistance of the aircraft becomes a problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The invention aims to solve the problems in the prior art, provides a drag reduction surface structure of an underwater vehicle hull, breaks through the technical barriers of the traditional drag reduction structure, and greatly reduces the resistance of the underwater vehicle.
In order to solve the problems in the prior art, the technical scheme adopted by the invention is as follows:
an underwater vehicle hull drag reduction surface structure, characterized by: the device comprises a feather-shaped drag reduction structure array arranged on the outer shell of the underwater vehicle, wherein the feather-shaped drag reduction structure array is asymmetrically distributed on the upper surface and the lower surface of the outer shell of the underwater vehicle, and the asymmetrical distribution is one or a combination of asymmetrical structures, asymmetrical structure sizes or asymmetrical arrangement modes of the feather-shaped drag reduction structure array on the upper surface and the lower surface of the outer shell of the underwater vehicle; the feather-shaped drag reduction structures forming the feather-shaped drag reduction structure array comprise a feather shaft structure and feather branch structures, wherein the feather shaft structure is arranged along the surface fluid flow direction of the outer shell of the aircraft, and the feather branch structures are distributed on two sides of the feather shaft structure in the downstream direction.
The middle section of the underwater vehicle is cylindrical, and the feather-shaped drag reduction structure array is arranged on the surface of the middle section of the underwater vehicle.
Furthermore, the feather-shaped drag reduction structure is a micron-sized structure, and the shaft structure and the branch structure are also micron-sized.
Furthermore, the shaft structure and the feather structure are formed by gullies or protrusions arranged on the surface of the outer shell of the underwater vehicle, and specifically, four combinations are provided, wherein the first type, namely the shaft structure and the feather structure, is formed by processing gullies in the outer shell of the underwater vehicle, and the processing mode can adopt technologies such as template printing, etching or laser direct writing; the second type, the shaft structure and the feather structure are formed by processing bulges on the outer shell of the underwater vehicle, and the processing mode can be additive manufacturing besides template printing, etching and laser direct writing; thirdly, the feather shaft structure is gully, the feather branch structure is convex, and the processing mode refers to the former two modes; and fourthly, the feather shaft structure is a bulge, the feather branch structure is a gully, and the processing modes are shown in the former two modes.
Further, the cross section of the shaft and the branches in the feather-shaped drag reduction structure is in any one or combination of a circle, a semicircle, an ellipse, a polygon and an irregular shape.
Furthermore, the width ratio of the pinnate axis structure to the pinnate branch structure is 1: 1-10: 1, the width is an equivalent width or a maximum width, the equivalent width is that for an irregular shape, the irregular shape is equivalent to a circle, and the equivalent circle diameter is equivalent width.
Further, the pinnate axis structure and the pinnate branch structure can be one or a combination of a linear type, a curved type and an irregular linear type.
Furthermore, the asymmetric structure means that the feather-shaped drag reduction structure adopts different structural shapes on the upper surface and the lower surface of the hull of the underwater vehicle; specifically, the feather-shaped drag reduction structures are respectively in different shapes on the upper surface and the lower surface of the hull of the underwater vehicle, or the shape rules of the feather-shaped drag reduction structures change along with the increase of underwater depth.
The structural shape of the feather-shaped drag reduction structure comprises the section shapes of a feather shaft and a feather branch structure and the shape of the feather shaft and the feather branch structure, for example, the feather shaft adopts a circular section linear type on the upper surface, the lower surface adopts a circular section curve type, the feather branches adopt a polygonal section curve type on the upper surface, the lower surface adopts a circular section curve type, and the like, but the invention is not limited to the above.
Further, the asymmetric structure size means that the feather-shaped drag reduction structures adopt different size levels on the upper surface and the lower surface of the hull of the underwater vehicle; specifically, the sizes of the feather-shaped drag reduction structures are respectively and uniformly distributed on the upper surface and the lower surface of the hull of the underwater vehicle, or the feather-shaped drag reduction structures are gradually reduced along with the increase of underwater depth.
The feather-shaped drag reduction structure is micron-sized, the feathers and the feather shafts are also micron-sized, the length of the feather shafts is 0.1-100 microns, the width of the feather shafts is 0.1-10 microns, the length of the feather shafts is 0.1-100 microns, and the width of the feather shafts is 0.1-10 microns.
Furthermore, the asymmetric arrangement mode means that the feather-shaped drag reduction structures are arranged on the upper surface and the lower surface of the hull of the underwater vehicle in different arrangement modes; specifically, the feather-shaped drag reduction structures are uniformly arranged on the upper surface and the lower surface of the hull of the underwater vehicle, or the arrangement mode of the feather-shaped drag reduction structures is regularly changed along with the increase of underwater depth.
Further, the arrangement mode comprises density arrangement and orientation arrangement of the feather-shaped drag reduction structures, and the density arrangement comprises density arrangement of the feather-shaped drag reduction structures in a unit area in the feather-shaped drag reduction structure array and density arrangement of the feather branch structures in a single feather-shaped drag reduction structure; for example, the density of the feather-shaped drag reduction structures in unit area on the upper surface and the lower surface is uniformly distributed, or the density of the feather-shaped drag reduction structures in unit area on the surface of the hull of the underwater vehicle, particularly the lower surface, is increased along with the increase of the depth; the orientation arrangement comprises orientation arrangement of a pinnate shaft structure and orientation arrangement of a pinnate branch structure, for example, the size of an included angle between the pinnate shaft and the flow direction, and it is of course optimal that the pinnate shaft is parallel to the flow direction of the fluid, the included angle between the pinnate branch and the flow direction of the fluid forms an acute angle, and the angle range is 5-60 degrees.
Further, the orientation arrangement of the pinnate structure comprises a parallel arrangement and a non-parallel arrangement; the arrangement mode of the pinnate structure can be one or a combination of a plurality of kinds of arrangement modes of longitudinal and transverse alignment and tidy arrangement, longitudinal and transverse staggered arrangement and irregular arrangement.
Further, as a preferred solution, the feather-shaped drag reducing structures present a uniform distribution on the lower surface of the hull of the underwater vehicle or decrease in size with increasing density of the shafts, branches, or both, per unit area as the depth increases.
The invention has the beneficial effects that:
the drag reduction surface of the hull of the underwater vehicle overturns the surface of the hull of the traditional symmetric vehicle. The drag reduction surface of the novel drag reduction underwater vehicle outer shell is provided with an asymmetric upper surface and an asymmetric lower surface, the drag reduction structure of the asymmetric upper surface and the asymmetric lower surface is of a feather-shaped array structure, and the feather-shaped array structure can be one or a combination of asymmetric structure, asymmetric structure size or asymmetric arrangement mode on the upper surface and the lower surface of the outer shell. By utilizing the asymmetric structure on the surface of the outer shell of the aircraft, the navigation resistance is effectively reduced, the navigation speed and stability are improved, the energy consumption is reduced, the requirements of environmental protection, energy conservation and emission reduction are met, and the remarkable economic and environmental benefits are achieved.
Drawings
Fig. 1 is a schematic view of the overall structure of the drag reduction surface structure of the hull of an underwater vehicle of the present invention.
Fig. 2 is a cross-sectional view of the badminton shaft with a gully structure and the badminton branches with a convex structure in example 1.
Fig. 3 is a cross-sectional view of embodiment 2, in which the shafts are protruded and the branches are gully.
FIG. 4 is a schematic view of the overall structure of a curved pinna.
Fig. 5 is a cross-sectional view of the badminton shaft of fig. 4 in a convex structure and the badminton branches in a gully structure.
Fig. 6 is a cross-sectional view of the badminton shaft of fig. 4 in a gully structure and the badminton branches in a convex structure.
Fig. 7 is a graph showing the change in surface friction with time in example 1.
Fig. 8 is a graph showing the change in surface friction with time in example 2.
Fig. 9 is a graph showing the change with time of the surface friction force in example 3.
Fig. 10 is a graph showing the change in surface friction force with time in example 4.
FIG. 11 is a graph showing the change with time of the surface friction force in example 5.
1-submarine shell; 2-a pinnate axis structure; 3-pinnate structure.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1:
the embodiment is used for manufacturing a novel underwater vehicle hull with a drag reduction surface, a template printing method is selected to construct a drag reduction structure on the surface of the hull, as shown in fig. 2, the feather-shaped drag reduction structures forming the feather-shaped drag reduction structure array are composed of a feather shaft structure 2 and a feather branch structure 3, the feather shaft structure 2 is composed of gullies, the feather branch structure 3 is composed of protrusions, and an included angle between the feather branch structure 3 and the flow direction of fluid is 45 degrees. The cross sections of the ravines and the bulges are circular, the feather shaft structures 2 and the feather branch structures 3 are both linear, and the width ratio of the feather shaft structures to the feather branch structures is 3: 1. The feather-shaped drag reduction structures are uniformly distributed on the upper surface of the aircraft shell, the structure sizes are fixed and uniformly distributed, the density of the down shafts and down branches in unit area is increased along with the increase of the depth on the lower surface, and the structure sizes are reduced. The pinnate axis structures 2 are arranged in parallel, and the pinnate branch structures 3 are arranged in parallel. The length of the shaft was 15 microns, the width was 5 microns, and the length of the plume was 2 microns.
And (3) carrying out wettability and liquid-solid friction force tests on the drag reduction surface of the underwater vehicle hull and the unstructured surface of the underwater vehicle hull by using a contact angle measuring instrument.
Drag reduction surface of underwater vehicle hull: the static contact angle is 149 DEG and the rolling angle is 9 deg.
Aircraft skin unstructured surface: the static contact angle is 120 DEG and the rolling angle is 40 deg.
The drag reducing surfaces of underwater vehicle hulls and the unstructured surface friction of the vehicle hulls over time are shown in fig. 7. :
the static contact angle of the drag reduction surface of the underwater vehicle outer shell is obviously larger than that of the unstructured surface of the vehicle outer shell, the rolling angle of the drag reduction surface is far smaller than that of the unstructured surface, the drag reduction surface of the underwater vehicle outer shell is more difficult to wet by liquid, the viscous force on the structure is small, the liquid-solid friction force (35 micro-newtons) of the drag reduction surface is far smaller than that of the unstructured surface (60 micro-newtons), the drag reduction surface of the underwater vehicle outer shell is more easy to roll off from the drag reduction surface of the underwater vehicle outer shell, and good hydrophobic performance is shown.
Example 2:
the embodiment is used for manufacturing a novel underwater vehicle hull with a drag reduction surface, and a 3D printing method is selected to construct a drag reduction structure on the surface of the hull, as shown in FIG. 3, the feather-shaped drag reduction structures forming the feather-shaped drag reduction structure array are composed of a feather shaft structure 2 and a feather branch structure 3, the feather shaft structure 2 is a convex structure, the feather branch structure 3 is a gully structure, and an included angle between the feather branch structure 3 and the flow direction of fluid is 30 degrees. The cross section of the bulge is circular, the feather shaft structure 2 is linear, the feather branch structure 3 is curved, and the width ratio of the feather shaft structure 2 to the feather branch structure 3 is 2: 1. The feather-shaped drag reduction structures are uniformly distributed on the upper surface of the aircraft shell, and the size of the upper surface feather shaft structure is larger than that of the lower surface feather shaft structure. The feather axis structure is arranged in parallel, and the feather branch structure is arranged in parallel. The length of the shaft was 10 microns, the width was 6 microns, and the length of the plume was 2 microns.
And (3) carrying out wettability and liquid-solid friction force tests on the drag reduction surface of the underwater vehicle hull and the unstructured surface of the underwater vehicle hull by using a contact angle measuring instrument.
Drag reduction surface of underwater vehicle hull: the static contact angle was 153 ° and the roll angle was 4 °.
Aircraft skin unstructured surface: the static contact angle is 125 deg., and the rolling angle is 30 deg..
Drag reducing surfaces of underwater vehicle hulls and unstructured surfaces of vehicle hulls friction over time are shown in FIG. 8
The static contact angle of the drag reduction surface of the underwater vehicle outer shell is obviously larger than that of the unstructured surface of the vehicle outer shell, the rolling angle of the drag reduction surface is far smaller than that of the unstructured surface, the drag reduction surface of the underwater vehicle outer shell is more difficult to wet by liquid, the viscous force on the structure is small, the liquid-solid friction force (20 micro-newtons) of the drag reduction surface is far smaller than that of the unstructured surface (40 micro-newtons), the drag reduction surface of the underwater vehicle outer shell is more easy to roll off from the drag reduction surface of the underwater vehicle outer shell, and good hydrophobic performance is shown.
Example 3:
the embodiment is used for manufacturing a novel underwater vehicle hull with a resistance-reducing surface, a laser direct writing method is selected to construct a resistance-reducing structure on the surface of the hull, the feather-shaped resistance-reducing structures forming the feather-shaped resistance-reducing structure array are composed of a feather shaft structure 2 and a feather branch structure 3, the feather shaft structure 2 and the feather branch structure 3 are both gully structures, and the included angle between the feather branch structure 3 and the flow direction of fluid is 20 degrees. The cross section of the ravines is circular, the feather shaft structures 2 are linear, the feather branch structures 3 are linear, and the width ratio of the feather shaft structures 2 to the feather branch structures 3 is 3: 1. The feather-shaped drag reduction structures are uniformly distributed on the upper surface of the aircraft shell, and the size of the upper surface feather shaft structure is smaller than that of the lower surface feather shaft structure. The feather axis structure is arranged in parallel, and the feather branch structure is arranged in parallel. The length of the shaft was 20 microns, the width was 7 microns, and the length of the plume was 3.5 microns.
And (3) carrying out wettability and liquid-solid friction force tests on the drag reduction surface of the underwater vehicle hull and the unstructured surface of the underwater vehicle hull by using a contact angle measuring instrument.
Drag reduction surface of underwater vehicle hull: the static contact angle is 157 deg., and the rolling angle is 4 deg..
Aircraft skin unstructured surface: the static contact angle is 122 DEG and the rolling angle is 35 deg.
Drag reducing surfaces of underwater vehicle hulls and unstructured surfaces of vehicle hulls friction over time are shown in FIG. 8
The static contact angle of the drag reduction surface of the underwater vehicle outer shell is obviously larger than that of the unstructured surface of the vehicle outer shell, the rolling angle of the drag reduction surface is far smaller than that of the unstructured surface, the drag reduction surface of the underwater vehicle outer shell is more difficult to wet by liquid, the viscous force on the structure is small, the liquid-solid friction force (65 micro-newtons) of the drag reduction surface is far smaller than that of the unstructured surface (41 micro-newtons), the drag reduction surface of the underwater vehicle outer shell is more easy to roll off from the drag reduction surface of the underwater vehicle outer shell, and good hydrophobic performance is shown.
Example 4:
the embodiment is used for manufacturing the novel underwater vehicle hull with the resistance-reducing surface, the resistance-reducing structure on the surface of the hull is constructed by selecting a material increase manufacturing method, the feather-shaped resistance-reducing structures forming the feather-shaped resistance-reducing structure array are composed of a feather shaft structure 2 and a feather branch structure 3, the feather shaft structure 2 and the feather branch structure 3 are both of a convex structure, and the included angle between the feather branch structure 3 and the flow direction of fluid is 35 degrees. The cross section of the bulge is square, the pinnate shaft structure 2 is curved, the pinnate branch structure 3 is curved, and the width ratio of the pinnate shaft structure 2 to the pinnate branch structure 3 can be 5: 1. The feather-shaped drag reduction structures are uniformly distributed on the upper surface of the aircraft shell, and the size of the upper surface feather shaft structure is larger than that of the lower surface feather shaft structure. The feather axis structure is arranged in parallel, and the feather branch structure is arranged in parallel. The length of the shaft was 21 microns, the width was 8.5 microns, and the length of the plume was 1.8 microns.
And (3) carrying out wettability and liquid-solid friction force tests on the drag reduction surface of the underwater vehicle hull and the unstructured surface of the underwater vehicle hull by using a contact angle measuring instrument.
Drag reduction surface of underwater vehicle hull: the static contact angle is 158 deg., and the rolling angle is 2 deg..
Aircraft skin unstructured surface: the static contact angle was 125 ° and the roll angle was 32 °.
Drag reducing surfaces of underwater vehicle hulls and unstructured surfaces of vehicle hulls friction over time are shown in FIG. 8
The static contact angle of the drag reduction surface of the underwater vehicle outer shell is obviously larger than that of the unstructured surface of the vehicle outer shell, the rolling angle of the drag reduction surface is far smaller than that of the unstructured surface, the drag reduction surface of the underwater vehicle outer shell is more difficult to wet by liquid, the viscous force on the structure is small, the liquid-solid friction force (59 micro-newtons) of the drag reduction surface is far smaller than that of the unstructured surface (39 micro-newtons), the drag reduction surface of the underwater vehicle outer shell is more easy to roll off from the drag reduction surface of the underwater vehicle outer shell, and good hydrophobic performance is shown.
Example 5:
the embodiment is used for manufacturing the novel underwater vehicle hull with the resistance-reducing surface, the resistance-reducing structure on the surface of the hull is constructed by selecting a template method, the feather-shaped resistance-reducing structure forming the feather-shaped resistance-reducing structure array is composed of a feather shaft structure 2 and a feather branch structure 3, the feather shaft structure 2 and the feather branch structure 3 are both of a convex structure, and the included angle between the feather branch structure 3 and the flow direction of fluid is 50 degrees. The cross section of the bulge is triangular, the pinnate shaft structure 2 is curved, the pinnate branch structure 3 is linear, and the width ratio of the pinnate shaft structure 2 to the pinnate branch structure 3 can be 5.5: 1. The feather-shaped drag reduction structures are uniformly distributed on the upper surface of the aircraft shell, and the size of the upper surface feather shaft structure is larger than that of the lower surface feather shaft structure. The feather axis structure is arranged in parallel, and the feather branch structure is arranged in parallel. The length of the shaft was 30 microns, the width was 8 microns, and the length of the plume was 4 microns.
And (3) carrying out wettability and liquid-solid friction force tests on the drag reduction surface of the underwater vehicle hull and the unstructured surface of the underwater vehicle hull by using a contact angle measuring instrument.
Drag reduction surface of underwater vehicle hull: the static contact angle is 155 deg., and the rolling angle is 5 deg..
Aircraft skin unstructured surface: the static contact angle is 120 DEG and the rolling angle is 38 deg.
Drag reducing surfaces of underwater vehicle hulls and unstructured surfaces of vehicle hulls friction over time are shown in FIG. 8
The static contact angle of the drag reduction surface of the underwater vehicle outer shell is obviously larger than that of the unstructured surface of the vehicle outer shell, the rolling angle of the drag reduction surface is far smaller than that of the unstructured surface, the drag reduction surface of the underwater vehicle outer shell is more difficult to wet by liquid, the viscous force on the structure is small, the liquid-solid friction force (65 micro-newtons) of the drag reduction surface is far smaller than that of the unstructured surface (41 micro-newtons), the drag reduction surface of the underwater vehicle outer shell is more easy to roll off from the drag reduction surface of the underwater vehicle outer shell, and good hydrophobic performance is shown.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or directly or indirectly applied to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. An underwater vehicle hull drag reduction surface structure, characterized by: the device comprises a feather-shaped drag reduction structure array arranged on the outer shell of the underwater vehicle, wherein the feather-shaped drag reduction structure array is asymmetrically distributed on the upper surface and the lower surface of the outer shell of the underwater vehicle, and the asymmetrical distribution is one or a combination of asymmetrical structures, asymmetrical structure sizes or asymmetrical arrangement modes of the feather-shaped drag reduction structure array on the upper surface and the lower surface of the outer shell of the underwater vehicle; the feather-shaped drag reduction structures forming the feather-shaped drag reduction structure array comprise a feather shaft structure and feather branch structures, wherein the feather shaft structure is arranged along the surface fluid flow direction of the outer shell of the aircraft, and the feather branch structures are distributed on two sides of the feather shaft structure in the downstream direction.
2. The underwater vehicle hull drag reducing surface structure of claim 1, wherein: the feather shaft structure and the feather branch structure are formed by gullies or bulges arranged on the surface of the outer shell of the underwater vehicle.
3. The underwater vehicle hull drag reducing surface structure of claim 2, wherein: the cross section of the shaft and the branches in the feather-shaped drag reduction structure is in any one or combination of a plurality of shapes, such as a circle, a semicircle, an ellipse, a polygon and an irregular shape.
4. The underwater vehicle hull drag reducing surface structure of claim 1, wherein: the width ratio of the pinnate axis structure to the pinnate branch structure is 1: 1-10: 1.
5. The underwater vehicle hull drag reducing surface structure of claim 1, wherein: the pinnate shaft structure and the pinnate branch structure are one or a combination of a plurality of linear types, curved types and irregular linear types.
6. The underwater vehicle hull drag reducing surface structure of claim 3, wherein: the asymmetric structure means that the feather-shaped drag reduction structure adopts different structural shapes on the upper surface and the lower surface of the hull of the underwater vehicle; specifically, the feather-shaped drag reduction structures are respectively in different shapes on the upper surface and the lower surface of the hull of the underwater vehicle, or the shape rules of the feather-shaped drag reduction structures change along with the increase of underwater depth.
7. The underwater vehicle hull drag reducing surface structure of claim 1, wherein: the asymmetric structure size means that the feather-shaped drag reduction structure adopts different size grades on the upper surface and the lower surface of the hull of the underwater vehicle; specifically, the sizes of the feather-shaped drag reduction structures are respectively and uniformly distributed on the upper surface and the lower surface of the hull of the underwater vehicle, or the feather-shaped drag reduction structures are gradually reduced along with the increase of underwater depth.
8. The underwater vehicle hull drag reducing surface structure of claim 1, wherein: the asymmetric arrangement mode means that the feather-shaped drag reduction structures are arranged on the upper surface and the lower surface of the shell of the underwater vehicle in different arrangement modes; specifically, the feather-shaped drag reduction structures are uniformly arranged on the upper surface and the lower surface of the hull of the underwater vehicle, or the arrangement mode of the feather-shaped drag reduction structures is regularly changed along with the increase of underwater depth.
9. The underwater vehicle hull drag reducing surface structure of claim 1, wherein: the arrangement mode comprises density arrangement and orientation arrangement of the feather-shaped drag reduction structures, and the density arrangement comprises density arrangement of the feather-shaped drag reduction structures in unit area in the feather-shaped drag reduction structure array and density arrangement of feather branch structures in a single feather-shaped drag reduction structure; the orientation arrangement comprises orientation arrangement of a pinnate structure and orientation arrangement of a pinnate structure.
10. The underwater vehicle hull drag reducing surface structure of claim 7, wherein: the orientation arrangement of the feather axis structure comprises parallel arrangement and non-parallel arrangement; the arrangement mode of the pinnate structure can be one or a combination of a plurality of kinds of arrangement modes of longitudinal and transverse alignment and tidy arrangement, longitudinal and transverse staggered arrangement and irregular arrangement.
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| CN114715328A (en) * | 2022-04-02 | 2022-07-08 | 中国船舶重工集团公司第七二五研究所 | Surface drag reduction structure material |
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|---|---|---|---|---|
| CN114715328A (en) * | 2022-04-02 | 2022-07-08 | 中国船舶重工集团公司第七二五研究所 | Surface drag reduction structure material |
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| CN113200119B (en) | 2022-07-05 |
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