CN212254979U - Device for rapidly measuring drag reduction effect of super-hydrophobic surface - Google Patents
Device for rapidly measuring drag reduction effect of super-hydrophobic surface Download PDFInfo
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- CN212254979U CN212254979U CN202021234147.4U CN202021234147U CN212254979U CN 212254979 U CN212254979 U CN 212254979U CN 202021234147 U CN202021234147 U CN 202021234147U CN 212254979 U CN212254979 U CN 212254979U
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- 230000003075 superhydrophobic effect Effects 0.000 title claims abstract description 76
- 230000009467 reduction Effects 0.000 title claims abstract description 29
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- 238000005381 potential energy Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 abstract description 3
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Abstract
The utility model belongs to the technical field of fluid drag reduction, a device of quick measurement super hydrophobic surface drag reduction effect. The device comprises a water tank, a super-hydrophobic surface component, a graduated scale, a gravity ball, a rigid rope, a horizontal rod, a positioning ring, a lifting frame, a locking component and a fixing frame; the super-hydrophobic surface component consists of a ship model, a super-hydrophobic surface and a baffle; the locking assembly consists of a follow-up hinge, a fixed hinge and a positioning pin; the gravity ball converts gravitational potential energy into the kinetic energy of super-hydrophobic surface subassembly through the rigidity rope and promotes super-hydrophobic surface subassembly along surface of water linear motion, directly records the drag reduction effect through record and contrast super-hydrophobic surface subassembly and smooth surface subassembly to the distance of marcing when stopping, the utility model discloses model manufacturing cost is low, can quick visual measurement super-hydrophobic surface drag reduction effect, do not receive super-hydrophobic surface preparation method restriction, require low, to measuring advantages such as the operating requirement is simple to the leakproofness.
Description
Technical Field
The utility model belongs to the technical field of fluid drag reduction, in particular to device of quick measurement super hydrophobic surface drag reduction effect.
Background
At present, in order to meet the important development strategy of building a powerful ocean in China, higher requirements are put forward on the performance of marine navigation bodies such as ships and submarines, the running speed and the energy consumption rate of the navigation bodies are related to a power system, and the most main influence factor of the navigation bodies is the running resistance of the navigation bodies in seawater; the surface with the microstructure is subjected to super-hydrophobic treatment, and wall surface sliding is generated when liquid flows on the super-hydrophobic surface, so that the resistance in laminar flow and turbulent flow is reduced by the wall surface sliding. Therefore, the super-hydrophobic surface with the drag reduction function is the key for reducing the running resistance of the navigation body.
In the research of the drag reduction performance of the super-hydrophobic surface, in order to enable objective comparison of different surfaces, it is necessary and urgent to establish uniform and sound test equipment; the existing experimental device for the super-hydrophobic resistance reduction performance, such as TRPEV experimental research [ D ] of a super-hydrophobic wall resistance reduction and wall turbulence coherent structure, Tianjin university, 2016 ], utilizes PIV equipment with high cost, and a test part of a test bench has a complex structure, large floor area, difficult preparation and installation process of a large-area super-hydrophobic surface, long test time consumption, high requirement on operators and high sealing difficulty; because a set of testing device for measuring the super-hydrophobic resistance reduction effect has the advantages of simple model, simple and convenient sample replacement, strong sealing performance and capability of quickly and accurately detecting the resistance reduction effect, the development and the application of the super-hydrophobic surface resistance reduction technology in the marine aircraft are greatly limited.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the device for rapidly measuring the drag reduction effect of the super-hydrophobic surface has the advantages of capability of rapidly and accurately evaluating the drag reduction effect of the super-hydrophobic surface without any analysis and calculation, small limitation on surface preparation and installation specifications, friendliness to operators and the like, and provides a basic reference for further research on the super-hydrophobic surface.
The technical scheme of the utility model:
a device for rapidly measuring the drag reduction effect of a super-hydrophobic surface comprises: the device comprises a water tank, a super-hydrophobic surface component, a graduated scale, a gravity ball, a rigid rope, a horizontal rod, a positioning ring, a lifting frame, a locking component and a fixing frame;
the super-hydrophobic surface component comprises a ship model, an annular groove, a baffle and a super-hydrophobic surface; the bottom surface of the ship model is provided with a C-shaped notch for assembling the super-hydrophobic surface along the flow direction, and the super-hydrophobic surface is connected into the C-shaped notch of the bottom surface of the ship model in a sliding manner; the annular groove is fixedly connected in the cavity of the ship model and is positioned at the gravity center of the ship model; the baffle is arranged at the bottom of the tail end of the ship model, and the super-hydrophobic surface and the ship model are fixed into an integral model through threaded connection;
the locking assembly comprises a follow-up hinge, a positioning pin and a fixed hinge, a rectangular opening is formed in the outer side of the fixing frame, the fixed hinge is mounted on the right side of the fixing frame, the fixed hinge is flush with the rectangular opening in height, a fan-shaped clamping block matched with the rectangular opening is arranged on the follow-up hinge, the follow-up hinge is hinged with the fixed hinge through the positioning pin, and the follow-up hinge is rotated around a shaft;
the graduated scale is arranged on the inner side of the water tank along the flow direction; the fixed frame base is fixedly connected to the ground, is hollow inside and is sleeved with the lifting frame; the bottom end of the positioning ring is provided with a transverse column hole for connecting a rigid rope, and the gravity ball is tied on the positioning ring through the rigid rope; the middle parts of the horizontal rod and the positioning ring are provided with coaxial threaded through holes, and the positioning ring is fastened at the center of the horizontal rod through threaded connection; the top end of the lifting frame is provided with a rectangular through hole which is embedded with the rectangular blocks at the two ends of the horizontal rod.
The lower surface of the super-hydrophobic surface can be a regular microstructure, a nano structure, a micro-nano composite structure or a surface coated with a super-hydrophobic coating, and the upper surface is an untreated smooth surface; in order to seal and mount the super-hydrophobic surface and the ship model, two side surfaces of the super-hydrophobic surface are arc-shaped and are matched with the C-shaped groove openings, and sealing strips are attached to the two side surfaces;
in order to realize the adjustment of gravitational potential energy of the gravity ball, a row of rectangular grooves which are arranged along the vertical direction are arranged on the lifting frame, the fan-shaped clamping block on the follow-up hinge penetrates through the rectangular opening on the outer side of the fixing frame and is embedded into the rectangular groove of the lifting frame, so that the clamping and fixing effects are realized, the height of the lifting frame can be limited by adjusting the position of the rectangular groove in which the fan-shaped clamping block is embedded, and the height of the gravity ball is correspondingly changed along with the rectangular groove so as to achieve the;
the inner annular groove of the ship model is used for placing weights so as to ensure that the ship model draught depths of different super-hydrophobic surfaces are consistent.
In order to avoid large fluctuation of the ship model in the process of traveling, the incident flow bottom of the ship model is arc-shaped, and the stability of the test effect of the super-hydrophobic surface is ensured.
In order to simulate the operation condition in the real seawater environment, the fluid in the water tank is at normal temperature, and artificial seawater is simply prepared.
Compared with the prior art, super hydrophobic surface drag reduction effect measuring device, model equipment cost is low, can survey the distance of marcing through the ship model directly perceivedly fast and assess the drag reduction effect, need not to carry out any complicated analysis and calculation, require lowly to surface shape, installation specification, require low grade advantage to the leakproofness, provide the basis for accelerating super hydrophobic surface drag reduction research and application, the utility model is also suitable for a high-speed technique of testing the speed of making a video recording, the super hydrophobic surface that can extensively test various methods and prepare out.
Drawings
FIG. 1 is a perspective view of the overall structure of the present invention;
FIG. 2(a) is a perspective view of an assembled superhydrophobic surface assembly;
FIG. 2(b) is a perspective view of a superhydrophobic surface assembly to be assembled;
FIG. 3 is a perspective view of the locking assembly;
FIG. 4 is a perspective view of the connection of the fixing frame with the lifting frame and the locking assembly;
FIG. 5 is a perspective half-sectional view of the horizontal rod and retaining ring connection.
In the figure: 1, a water tank; 2 a superhydrophobic surface component; 2-1 ship model; 2-2 annular grooves; 2-3 baffle plates; 2-4 of a superhydrophobic surface; 3, dividing a scale; 4, a gravity ball; 5 a rigid cord; 6, horizontal rods; 7 a positioning ring; 8, lifting the rack; 9 a locking assembly; 9-1 follow-up hinge; 9-2 positioning pins; 9-3, fixing a hinge; 10 a holder.
Detailed Description
The technical solution of the present invention will be fully and clearly described with reference to the accompanying drawings and examples;
in the description of the present invention, it should be noted that the terms "center", "inside", "outside", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 to 5, the utility model provides a device for rapidly measuring the drag reduction effect of a super-hydrophobic surface, which comprises a water tank, a super-hydrophobic surface component, a graduated scale, a gravity ball, a rigid rope, a horizontal rod, a positioning ring, a lifting frame, a locking component and a fixing frame;
the super-hydrophobic surface component 2 comprises a ship model 2-1, an annular groove 2-2, a baffle 2-3 and a super-hydrophobic surface 2-4; the bottom surface of the ship model 2-1 is provided with a C-shaped notch for assembling the super-hydrophobic surface along the flow direction, and the super-hydrophobic surface 2-4 is connected into the C-shaped notch of the bottom surface of the ship model 2-1 in a sliding manner; the annular groove 2-2 is fixedly connected in a cavity of the ship model and is positioned at the gravity center of the ship model; the baffle 2-3 is arranged at the bottom of the tail end of the ship model, and the super-hydrophobic surface 2-4 and the ship model 2-1 are fixed into an integral model through threaded connection; in order to avoid large fluctuation of the ship model in the process of traveling, the incident flow bottom of the ship model 2-1 is arc-shaped, and the stable drag reduction test effect of the super-hydrophobic surface is ensured.
The locking assembly 9 comprises a follow-up hinge 9-1, a positioning pin 9-2 and a fixed hinge 9-3, a rectangular opening is formed in the outer side of the fixed frame 10, the fixed hinge 9-3 is installed on the right side of the fixed frame 10, the height of the fixed hinge 9-3 is flush with that of the rectangular opening, a fan-shaped clamping block matched with the rectangular opening is arranged on the follow-up hinge 9-1, and the follow-up hinge 9-1 is hinged to the fixed hinge 9-3 through the positioning pin 9-2 to realize the pivoting of the follow-up hinge 9-1;
the graduated scale 3 is arranged on the inner side of the water tank 1 along the flow direction; the base of the fixed frame 10 is fixedly connected to the ground, the interior of the fixed frame is hollow, and the fixed frame is sleeved with the lifting frame 8; the bottom end of the positioning ring 7 is provided with a transverse column hole for connecting the rigid rope 5, and the gravity ball 4 is tied on the positioning ring 7 through the rigid rope 5; the middle parts of the horizontal rod 6 and the positioning ring 7 are both provided with coaxial threaded through holes, and the positioning ring 7 is fastened at the center of the horizontal rod 6 through threaded connection; rectangular blocks are arranged at two ends of the horizontal rod 6, and a rectangular through hole is formed in the top end of the lifting frame 8 and is embedded with the rectangular blocks at two ends of the horizontal rod (6);
the lower surface of the super-hydrophobic surface 2-4 can be a regular microstructure, a nano structure, a micro-nano composite structure or a surface coated with a super-hydrophobic coating, and the upper surface is an untreated smooth surface; in order to seal and mount the super-hydrophobic surface and the ship model, two side surfaces of the super-hydrophobic surface are arc-shaped and are matched with the C-shaped groove openings, and sealing strips are attached to the two side surfaces;
the lifting frame 8 is provided with a row of rectangular grooves which are arranged along the vertical direction, the fan-shaped clamping block on the follow-up hinge 9-1 penetrates through the rectangular opening on the outer side of the fixing frame 10 and is embedded into the rectangular grooves of the lifting frame 8, so that the clamping and fixing effects are achieved, the height of the lifting frame can be limited by adjusting the position where the fan-shaped clamping block is embedded into the rectangular grooves, and the height of the gravity ball 4 is correspondingly changed along with the rectangular grooves, so that the purpose of adjusting gravitational potential energy is achieved;
during testing, firstly, normal temperature is injected into the water tank 1, artificial seawater is simply configured, then the water tank 1 is placed in an indoor environment to ensure that a resistance measurement experiment is not influenced by environmental factors, the tail end of the super-hydrophobic surface component 2 and the natural-state gravity ball 4 are both placed at a zero scale of the graduated scale 3 in an aligned manner, weights are placed in the annular groove 2-2 to adjust the draught depth of the super-hydrophobic surface component 2 to just submerge the super-hydrophobic surface 2-4, the lifting frame 8 is lifted or lowered to a required height, the follow-up hinge 9-1 is rotated to the sector clamping block to be completely embedded into the groove of the lifting frame 8 for locking, so that the gravity ball 4 is ensured to reach the required gravitational potential energy, the gravity ball is pulled to a specified height and then released to fall freely, and the rigid rope 5 does not generate energy dissipation, and the whole gravitational potential energy of the gravity ball 4 is completely converted into the kinetic energy of, simultaneously, recording the distance from the running to the stopping of the super-hydrophobic surface component 2 through the graduated scale 3; and replacing the super-hydrophobic surface, repeating the experimental steps, and comparing the advancing distances of the super-hydrophobic components on different surfaces so as to compare the drag reduction effects of different super-hydrophobic surfaces.
The above embodiments are merely described as preferred embodiments of the present invention, and not intended to limit the concept and scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, which is fully set forth in the appended claims.
Claims (5)
1. A device for rapidly measuring the drag reduction effect of a super-hydrophobic surface is characterized by comprising a water tank (1), a super-hydrophobic surface component (2), a graduated scale (3), a gravity ball (4), a rigid rope (5), a horizontal rod (6), a positioning ring (7), a lifting frame (8), a locking component (9) and a fixing frame (10);
the super-hydrophobic surface component (2) comprises a ship model (2-1), an annular groove (2-2), a baffle (2-3) and a super-hydrophobic surface (2-4); the flow-in bottom of the ship model (2-1) is arc-shaped, a C-shaped notch used for assembling the super-hydrophobic surface (2-4) is formed in the bottom surface along the flow direction, and the super-hydrophobic surface (2-4) is connected into the C-shaped notch in the bottom surface of the ship model (2-1) in a sliding mode; the annular groove (2-2) is fixedly connected in a cavity of the ship model (2-1) and is positioned at the gravity center of the ship model (2-1); the baffle (2-3) is arranged at the bottom of the tail end of the ship model (2-1), and the super-hydrophobic surface (2-4) and the ship model (2-1) are fixed into a whole through threaded connection;
the locking assembly (9) comprises a follow-up hinge (9-1), a positioning pin (9-2) and a fixed hinge (9-3); a rectangular opening is formed in the outer side of the fixing frame (10), and the fixing hinge (9-3) is installed on the right side of the fixing frame (10) and is flush with the rectangular opening in height; the follow-up hinge (9-1) is provided with a fan-shaped clamping block matched with the rectangular opening, and the follow-up hinge (9-1) is hinged with the fixed hinge (9-3) through a positioning pin (9-2) to realize the axial rotation of the follow-up hinge (9-1);
the graduated scale (3) is arranged on the inner side of the water tank (1) along the flow direction; the base of the fixed frame (10) is fixedly connected to the ground, the interior of the fixed frame is hollow, and the fixed frame is sleeved with the lifting frame (8); the gravity ball (4) is tied on a positioning ring (7) through a rigid rope (5), and the positioning ring (7) is fixed in the middle of the horizontal rod (6) through threaded connection; the two ends of the horizontal rod (6) are provided with rectangular blocks, and the top end of the lifting frame (8) is provided with a rectangular through hole and is embedded with the rectangular blocks at the two ends of the horizontal rod (6).
2. The device for rapidly measuring the drag reduction effect of the superhydrophobic surface according to claim 1, wherein coaxial threaded through holes are formed in the middle of the horizontal rod (6) and the positioning ring (7), and a transverse column hole for connecting the rigid rope (5) is formed at the bottom end of the positioning ring (7).
3. The device for rapidly measuring the drag reduction effect of the superhydrophobic surface according to claim 1 or 2, wherein the lower surface of the superhydrophobic surface (2-4) is a regular microstructure, a nano structure, a micro-nano composite structure or a surface coated with a superhydrophobic coating, the upper surface is an untreated smooth surface, two side surfaces are arc-shaped and attached with sealing strips, and the arc-shaped and the sealing strips are matched with C-shaped notches.
4. The device for rapidly measuring the drag reduction effect of the superhydrophobic surface according to claim 1 or 2, wherein a row of rectangular grooves are arranged in the vertical direction on the lifting frame (8), and the fan-shaped clamping blocks on the follow-up hinges (9-1) penetrate through the rectangular openings on the outer sides of the fixing frames (10) and are embedded into the rectangular grooves of the lifting frame (8), so that the clamping fixing effect is achieved, and the height of the lifting frame can be limited by adjusting the positions of the clamping blocks embedded into the rectangular grooves.
5. The device for rapidly measuring the drag reduction effect of the superhydrophobic surface according to claim 3, wherein the lifting frame (8) is provided with a row of rectangular grooves arranged in the vertical direction, and the fan-shaped clamping blocks on the follow-up hinges (9-1) penetrate through the rectangular openings on the outer side of the fixed frame (10) and are embedded into the rectangular grooves of the lifting frame (8), so that the clamping fixing effect is achieved, and the height of the lifting frame can be limited by adjusting the positions of the clamping blocks embedded into the rectangular grooves.
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| CN202021234147.4U CN212254979U (en) | 2020-06-30 | 2020-06-30 | Device for rapidly measuring drag reduction effect of super-hydrophobic surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111610125A (en) * | 2020-06-30 | 2020-09-01 | 大连理工大学 | Device for rapidly measuring drag reduction effect of super-hydrophobic surface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610125A (en) * | 2020-06-30 | 2020-09-01 | 大连理工大学 | Device for rapidly measuring drag reduction effect of super-hydrophobic surface |
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