A corrugated surface microstructure with drag reduction function

Abstract

The present invention proposes a corrugated drag reduction functional surface microstructure, which belongs to the field of microstructures, including a substrate on which a plurality of grooves are arranged; the plurality of grooves are arranged in a row along a preset direction, and the plurality of rows of grooves are arranged along a direction perpendicular to the preset direction, the grooves are composed of two groove segments that are mirror-symmetrical relative to the vertical direction of the preset direction, and the adjacent ends of the two groove segments that constitute the same groove are butt-connected, the extension directions of the two ends of the groove segments intersect, and the adjacent two groove segments of two adjacent grooves in the same row are cross-arranged and interconnected; a plurality of grooves are arranged vertically and horizontally on the substrate surface and each groove is a structure composed of two groove segments that are mirror-symmetrical, and because the extension directions of the two ends of the groove segments intersect, fish scale-like patterns are formed on the substrate surface, so that the formed pattern structure has good drag reduction capability consistent with different fluid directions.

Description

Technical Field

[0001] The invention relates to the technical field of surface microstructures, and in particular to a corrugated surface microstructure with drag reduction function. Background Art

[0002] As an important carrier for marine exploration, transportation, search and rescue, underwater vehicles play an important role in marine economic construction and marine national defense. The pressure difference resistance and friction resistance encountered by underwater vehicles during travel will seriously affect the navigation speed. The energy consumption caused by them not only restricts the range, but also limits the load capacity and maneuverability of underwater vehicles. In order to reduce the influence of pressure difference resistance and friction resistance on the navigation speed of the vehicle, in addition to optimizing the shape of the underwater vehicle, it is also necessary to effectively control the friction resistance.

[0003] The main methods to effectively reduce surface friction resistance include groove microstructure, superhydrophobic micro-nanostructure, microbubble, etc. Groove microstructure is a tiny topological shape with a characteristic size of 1 to 100 microns and specific functions, such as microgroove array, micropit array, micropyramid array structure, etc. These microstructures are usually distributed on cross-scale mechanical surfaces of the order of 10 to 1000 mm, and can change the physical properties of the surface friction, lubrication, adhesion, wear resistance and fluid mechanics of parts, thereby significantly improving the functional characteristics of mechanical products and functional parts, including: operating efficiency, energy consumption, lubrication and sealing, working noise, material saving and lightweight, service life, etc.

[0004] Chinese patent CN115258033A discloses a micro-groove bionic drag reduction structure and its preparation method, which combines the groove microstructure with the drag reduction scheme of microbubbles. Chinese patent CN116714712B discloses a microstructure of a drag reduction functional surface and its forming method, which processes microgrooves on the substrate surface through ultra-precision machining technology. The current micro-groove structure is affected by ultra-precision machining technology and mostly adopts a simple straight line or arc extension structure, resulting in the flow direction of the fluid passing through the microstructure surface needing to be consistent with the extension direction of the micro-groove structure in order to play its drag reduction function. Therefore, how to design the texture layout of the microstructure on the drag reduction functional surface has become a research problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the present invention proposes a corrugated drag reduction functional surface microstructure, which is used to solve the problem that the current micro-groove structure is affected by ultra-precision processing technology and mostly adopts a simple straight line or arc extension structure, resulting in the flow direction of the fluid passing through the microstructure surface needing to be consistent with the extension direction of the micro-groove structure in order to exert its drag reduction function, and the texture layout of the microstructure on the drag reduction functional surface needs to be designed.

[0006] The technical solution of the present invention is implemented as follows: the present invention provides a corrugated drag reduction functional surface microstructure, including a substrate, on which a plurality of grooves are arranged; wherein, the plurality of grooves are arranged in a row along a preset direction, and a plurality of rows of grooves are arranged along a direction perpendicular to the preset direction, and the grooves are composed of two groove segments that are mirror-symmetrical relative to the vertical direction of the preset direction, and the adjacent ends of the two groove segments constituting the same groove are butt-connected, the extension directions of the two ends of the groove segments intersect, and the adjacent two groove segments of two adjacent grooves in the same row are cross-arranged and connected to each other.

[0007] On the basis of the above technical solution, preferably, the serial numbers of several groove segments in the same row are set to 1 to n, and the serial numbers of several rows of grooves are set to 1 to m; the even-numbered groove segments in the same row are cross-arranged with at least one odd-numbered groove segment and are interconnected.

[0008] More preferably, a gap is left between two adjacent grooves; the even-numbered groove segments in the same row are only cross-arranged with the adjacent odd-numbered groove segments and are interconnected, and the end of the nth groove segment in the same row is butt-connected with the end of the n+3th groove segment.

[0009] More preferably, the width of the gap is not greater than the width of the texture formed when the groove segments are arranged along a preset direction.

[0010] Further preferably, the nth slot segment in the same row intersects with the n+1th slot segment and the n+3th slot segment at the same time, the end of the nth slot segment in the mth row is connected to the n+2th slot segment in the m+1th row, or the end of the nth slot segment in the mth row is connected to the n-2th slot segment in the m+1th row.

[0011] More preferably, the even-numbered slot segments in the same row are only cross-arranged with adjacent odd-numbered slot segments and are interconnected, and the end of the nth slot segment in the mth row, the end of the n+3th slot segment in the mth row, the end of the n+1th slot segment in the m+1th row, and the end of the n+2th slot segment in the m+1th row are butt-connected.

[0012] On the basis of the above technical solution, preferably, the groove segment includes at least one arc segment and at least one straight segment, and the two groove segments constituting the same groove are connected by connecting the two arc segments, and the straight segment is connected at the other end of the arc segment.

[0013] On the basis of the above technical solution, preferably, the bottom width of the radial cross-section of the groove is smaller than the top width.

[0014] More preferably, the angle between the two side bevels of the groove and the horizontal plane ranges from 5 degrees to 80 degrees.

[0015] More preferably, the depth range of the groove is no more than 1 mm.

[0016] The corrugated drag reduction functional surface microstructure of the present invention has the following beneficial effects compared with the prior art:

[0017] (1) The present invention arranges a plurality of grooves vertically and horizontally on the surface of the substrate, and each groove is a structure composed of two groove segments that are mirror-symmetrical. Since the extension directions of the two ends of the groove segment intersect, fish-scale-like patterns are formed on the surface of the substrate, so that the formed pattern structure has good drag reduction capability for different fluid directions.

[0018] (2) The groove segments of the present invention can be composed of arc segments and straight line segments, which greatly expands the types of shapes that constitute a single groove, so that the groove segments that constitute the groove are not limited to a single arc shape.

[0019] (3) The radial cross-section of the groove of the present invention is a structure with a narrow bottom and a wide top and its processing depth is limited, indicating that the groove can be processed and manufactured by milling using a forming tool, which can greatly improve the forming efficiency of the microstructure and reduce the difficulty of the forming process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A top view of the surface microstructure of the present invention;

[0022] Figure 2 A top view of another embodiment of the surface microstructure of the present invention;

[0023] Figure 3 A top view of another embodiment of the surface microstructure of the present invention;

[0024] Figure 4 A top view of another embodiment of the surface microstructure of the present invention;

[0025] Figure 5 A top view of another embodiment of the surface microstructure of the present invention;

[0026] Figure 6 A top view of another embodiment of the surface microstructure of the present invention;

[0027] Figure 7 A top view of another embodiment of the surface microstructure of the present invention;

[0028] Figure 8 For the present invention Figure 7 The enlarged view of point A in the middle;

[0029] Fig. 9 is a side cross-sectional view of the surface microstructure of the present invention;

[0030] Fig.10 For the present invention Fig. 9 Enlarged view of point B in the middle.

[0031] In the figure: 1, substrate; 101, groove; 102, groove segment; 103, gap; 104, arc segment; 105, straight line segment. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1 As shown, a corrugated drag reduction functional surface microstructure of the present invention includes a substrate 1.

[0034] Among them, the substrate 1 represents a surface with a certain required equipment having a drag reduction function. The substrate 1 can be a metal surface, a plastic surface, etc. according to actual needs. At the same time, the surface of the substrate 1 is not limited to a plane, but can also be a spherical surface, a curved surface, or even an irregular undulating surface. However, in this embodiment, for the convenience of understanding, the surface of the substrate 1 can be regarded as a plane. A plurality of grooves 101 are arranged on the substrate 1, and the plurality of grooves 101 will form lines on the surface of the substrate 1, so that the surface of the substrate 1 has a drag reduction function.

[0035] A plurality of grooves 101 are arranged in a row along a preset direction, and a plurality of rows of grooves 101 are arranged in a direction perpendicular to the preset direction, so that a plurality of grooves 101 form a regular layout structure on the surface of the substrate 1. At the same time, the groove 101 is composed of two groove segments 102 that are mirror-symmetrical relative to the vertical direction of the preset direction, and the adjacent ends of the two groove segments 102 that form the same groove 101 are connected and connected, and the extension directions of the two ends of the groove segment 102 intersect so that the groove segment 102 extends into a structure similar to an arc, so the shape of a single groove 101 is similar to the shape of fish scales or leaves; when a plurality of grooves 101 are regularly arranged on the surface of the substrate 1, the surface of the substrate 1 is similar to the scale layout structure formed on the surface of the fish body or the texture structure of the shark skin surface. In addition, the adjacent two groove segments 102 of the adjacent two grooves 101 in the same row are cross-arranged and interconnected, so that the internal space of each groove 101 is connected into a whole, so that the fluid flowing through the surface of the substrate 1 can flow freely and smoothly in the layout structure of the groove 101. Through the combination of the above designs, the surface of the substrate 1 has a drag reduction effect.

[0036] exist Figure 1 In a preferred embodiment shown, the layout of the grooves 101 has multiple implementations. To facilitate the description of the layout of the grooves 101, the numbers of the groove segments 102 in the same row are sequentially 1 to n, and the numbers of the grooves 101 in the rows are sequentially 1 to m. For different implementations, the common point is that the groove segments 102 with even numbers in the same row are all arranged to cross with the groove segments 102 with odd numbers and are connected to each other, but the difference is that the groove segments 102 with even numbers cross with several groove segments 102 with odd numbers.

[0037] for Figure 1 In one embodiment represented by the embodiment, taking one of the grooves 101 in a row as the base point, the groove 101 is composed of the groove segments a1 and a2 in the row b1 in mirror symmetry, and the groove segment a2 intersects with the groove segment a3 of the next groove 101 and the groove segment a5 of the next groove 101 at the same time, that is, Figure 1 Each groove 101 will intersect with its adjacent groove 101 and the further adjacent groove 101 at the same time.

[0038] exist Figure 3 In a preferred embodiment shown in FIG. 1 , a groove 101 is formed by a groove segment a1 and a groove segment a2 in a mirror-symmetrical manner, and the groove segment a2 only intersects with the groove segment a3 of the next groove 101, and Figure 1 Each groove 101 only intersects with its adjacent grooves 101 .

[0039] exist Figure 4In a preferred embodiment shown, as another implementation method, a gap 103 is left between two adjacent grooves 101; at the same time, in order to allow the fluid to flow smoothly through the surface of the substrate 1 in the grooves 101 in the same row, the even-numbered groove segments 102 located in the same row are only cross-arranged and interconnected with the adjacent odd-numbered groove segments 102, and the end of the nth groove segment 102 located in the same row is connected to the end of the n+3th groove segment 102, so that the internal space of the grooves 101 in the same row forms a whole; at this time, the point where the ends of the two groove segments 102 are connected is exactly on the central axis of the groove 101 between the two.

[0040] exist Figure 2 In a preferred embodiment shown, in order to reduce the possible obstruction to the fluid when passing through the gap 103, the width of the gap 103 is not greater than the width of the pattern formed when the groove segments 102 are arranged along a preset direction, so that the fluid can flow more smoothly across different rows of grooves 101.

[0041] exist Figure 1 In a preferred embodiment shown, any groove 101 in each row crosses with the next two adjacent grooves 101 at the same time, and the nth groove segment 102 in the same row crosses with the n+1th groove segment 102 and the n+3th groove segment 102 at the same time and is connected to each other; at the same time, there is no gap 103 between the grooves 101 in adjacent rows, so the end of the nth groove segment 102 in the mth row is connected to the n+2th groove segment 102 in the m+1th row, or the end of the nth groove segment 102 in the mth row is connected to the n-2th groove segment 102 in the m+1th row. Specifically, one of the grooves 101 is composed of the mirror-symmetric groove segments a1 and a2 in the b1th row, and the groove segment a2 crosses with the groove segment a3 of the next groove 101 and the groove segment a5 of the next groove 101 at the same time, and the end of the groove segment a2 is connected to the groove segment a4 in the b2th row. Through the above design, the grooves 101 in two adjacent rows are interconnected to form a whole, which is beneficial for the flow of fluid in the layout structure of the grooves 101 .

[0042] exist Figure 3In a preferred embodiment shown, any groove 101 in each row only crosses with the next adjacent groove 101, so the groove segments 102 with even numbers in the same row only cross and communicate with the adjacent groove segments 102 with odd numbers. At the same time, there is no gap 103 between the grooves 101 in adjacent rows, and the ends of the nth groove segment 102 in the mth row, the n+3th groove segment 102 in the mth row, the n+1th groove segment 102 in the m+1th row, and the n+2th groove segment 102 in the m+1th row are butt-jointed and connected. Specifically, with one of the grooves 101 being row b1, the groove segments a1 and a2 are mirror-symmetrically composed, and the groove segment a2 only crosses with the groove segment a3 of the next groove 101, and the end of the groove segment a2 is also butt-jointed and connected with the groove segment a5 of the next groove 101. At the same time, since there is no gap 103 between the grooves 101 in adjacent rows, the butt ends of the groove segments a2 and a5 are also connected to the top of the groove 101 composed of the groove segments a3 and a4 in the row b2, so that the grooves 101 in two adjacent rows are interconnected as a whole, which is beneficial to the flow of fluid in the layout structure of the groove 101.

[0043] exist Figure 4 In the preferred embodiment shown, the difference from the previous embodiment is that there are gaps 103 between the grooves 101 in adjacent rows.

[0044] exist Figure 5 In a preferred embodiment shown, compared with the previous embodiment, the difference is that the shape of the groove 101 composed of two groove segments 102 is not limited to a semicircular arc, but can also be a semi-elliptical arc, which produces basically the same drag reduction effect as the semicircular arc groove 101.

[0045] exist Figure 6 In a preferred embodiment shown, similarly, compared with the previous embodiment, the difference is that the shape of the groove 101 composed of two groove segments 102 is not limited to a semicircular arc, but can also be composed of two arc-shaped groove segments 102 that are mirror-symmetrical. The formed groove 101 is also not a continuous arc, and the drag reduction effect it produces is basically the same as that of the semicircular arc groove 101.

[0046] exist Figure 7 In a preferred embodiment shown, similarly, compared with the previous embodiment, the difference is that the shape of the groove 101 composed of two groove segments 102 is not limited to a semicircular arc shape, but a semi-hexagonal shape can also be used. However, in order not to hinder the flow of the fluid in the groove 101, the corners of the hexagon are rounded, and the drag reduction effect produced is basically the same as that of the semicircular arc groove 101.

[0047] exist Figure 8In a preferred embodiment shown, based on the fact that the drag reduction function of the surface microstructure of the groove 101 is not significantly affected when the groove 101 adopts different shapes in the above embodiments, it can be inferred that as long as the groove 101 is a mirror-symmetrical structure and the groove segment 102 has an arc-shaped part, it will not cause a significant adverse effect on the drag reduction function of the groove 101 layout structure. Therefore, the groove segment 102 includes at least one arc segment 104 and at least one straight segment 105.

[0048] Taking the semi-hexagonal groove 101 as an example, the two groove segments 102 constituting the same groove 101 are connected and connected through two arc segments 104 to form the apex of the hexagon, and the straight line segment 105 is the side of the hexagon. In addition, when the groove 101 is a semi-hexagon, each groove 101 preferably intersects with the next two grooves 101, so that the straight line segments 105 of each groove 101 are staggered, which helps the fluid flow on the microstructure surface.

[0049] exist Fig. 9 In a preferred embodiment shown, the radial cross-sectional shape of the groove 101 is an inverted triangle, preferably an inverted isosceles triangle, and the bottom corners of the triangle are rounded. This shape design enables the groove 101 to be made by conventional milling processing means compared to the traditional micro-groove structure, which greatly reduces the difficulty of forming the microstructure surface. The radial cross-sectional shape of the groove 101 can also be an inverted trapezoid or a U shape. In the final analysis, the radial cross-sectional shape of the groove 101 is related to the shape of the forming tool. As long as the radial cross-sectional shape of the groove 101 is a shape with a narrow bottom and a wide top, it is easy to be processed by a forming tool.

[0050] exist Fig.10 In a preferred embodiment shown, the angle between the two side bevels of the groove 101 and the horizontal plane ranges from 5 degrees to 80 degrees. Under this angle design, the groove 101 can produce an effective drag reduction effect and is also easy to be manufactured by conventional milling processing means.

[0051] exist Fig.10 In a preferred embodiment shown, the depth of the groove 101 is no more than 1 mm. Under this depth design, the groove 101 can produce an effective drag reduction effect and is also easy to be manufactured by conventional milling processing means.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A corrugated drag reduction functional surface microstructure, characterized in that: include: A base body (1) having a plurality of grooves (101) arranged thereon; Wherein, a plurality of the grooves (101) are arranged in a row along a preset direction, a plurality of rows of the grooves (101) are arranged along a direction perpendicular to the preset direction, the groove (101) is composed of two groove segments (102) which are mirror-symmetrical with respect to the vertical direction of the preset direction, and the adjacent ends of the two groove segments (102) constituting the same groove (101) are butt-jointed and connected, the extension directions of the two ends of the groove segment (102) intersect, and the adjacent two groove segments (102) of two adjacent grooves (101) in the same row are cross-arranged and connected to each other; The groove segment (102) comprises at least one arc segment (104) and at least one straight segment (105); two groove segments (102) constituting the same groove (101) are connected by butting against two arc segments (104); and the straight segment (105) is connected to the other end of the arc segment (104).

2. The corrugated drag reduction functional surface microstructure according to claim 1, characterized in that: The serial numbers of the groove sections (102) in the same row are sequentially 1 to n, and the serial numbers of the grooves (101) in the same row are sequentially 1 to m; The even-numbered slot sections (102) located in the same row are arranged crosswise with at least one odd-numbered slot section (102) and are interconnected.

3. The corrugated drag reduction functional surface microstructure according to claim 2, characterized in that: A gap (103) is left between two adjacent grooves (101); The even-numbered slot segments (102) located in the same row are only arranged crosswise with adjacent odd-numbered slot segments (102) and are interconnected, and the end of the nth slot segment (102) located in the same row is butt-joined and connected with the end of the n+3th slot segment (102).

4. The corrugated drag reduction functional surface microstructure according to claim 3, characterized in that: The width of the gap (103) is no greater than the width of the pattern formed when the groove segments (102) are arranged along a preset direction.

5. The corrugated drag reduction functional surface microstructure according to claim 2, characterized in that: The nth slot segment (102) located in the same row intersects with the n+1th slot segment (102) and the n+3th slot segment (102) at the same time, and the end of the nth slot segment (102) in the mth row is connected to the n+2th slot segment (102) in the m+1th row, or the end of the nth slot segment (102) in the mth row is connected to the n-2th slot segment (102) in the m+1th row.

6. The corrugated drag reduction functional surface microstructure according to claim 2, characterized in that: The even-numbered slot segments (102) located in the same row are only arranged crosswise with adjacent odd-numbered slot segments (102) and are interconnected, and the end of the nth slot segment (102) in the mth row, the end of the n+3th slot segment (102) in the mth row, the end of the n+1th slot segment (102) in the m+1th row, and the end of the n+2th slot segment (102) in the m+1th row are butt-jointed and connected.

7. The corrugated drag reduction functional surface microstructure according to claim 1, characterized in that: The radial cross-sectional shape of the groove (101) has a bottom width that is smaller than a top width.

8. The corrugated drag reduction functional surface microstructure according to claim 7, characterized in that: The included angle between the two side oblique sides of the groove (101) and the horizontal plane ranges from 5 degrees to 80 degrees.

9. The corrugated drag reduction functional surface microstructure according to claim 7, characterized in that: The depth range of the groove (101) is no greater than 1 mm.

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