Polymer drag reducing agent injection hydrofoil

Abstract

The application discloses a polymer drag-reducing agent injection type hydrofoil, and belongs to the technical field of polymer drag-reducing agents of underwater vehicles. The application solves the problem that there is no drag-reducing agent injection structure capable of stably outputting polymer drag-reducing agents and capable of adhering to the surface of a drag-reducing part of an underwater vehicle. One end of a steady flow cavity is communicated with a solution storage box in the underwater vehicle through a discharge channel, a cover plate is parallel and slidingly inserted on a main body of the hydrofoil, the lower surface of the cover plate is adhered to the upper surfaces of a plurality of fairing plates, and the outer surface of one end of the cover plate and the inner wall surface of one end of the steady flow cavity form an injection channel. The steady flow cavity has a steady flow effect on the solution, so that the stable output of the polymer solution is realized; the flow state of the polymer solution is adjusted through the fairing plates, so that the polymer solution flows stably; the polymer solution flows out to the surface of the hydrofoil through the injection channel, the frictional resistance generated during sailing is reduced, and the sailing performance of the underwater vehicle is improved.

Description

Technical Field

[0001] This invention relates to a polymer drag-reducing agent-injected hydrofoil, belonging to the field of polymer drag reduction technology for underwater vehicles. Background Technology

[0002] During navigation, underwater vehicles experience resistance primarily composed of frictional drag, pressure drag, and wave-making drag, with frictional drag accounting for a significant proportion. Effectively reducing frictional drag is crucial for increasing underwater vehicle speed, range, and energy efficiency. For nearly half a century, scholars both domestically and internationally have conducted in-depth research on underwater drag reduction, resulting in numerous drag reduction theories and technologies, such as surface morphology drag reduction and polymer solution drag reduction. Research on surface morphology drag reduction technology has mainly focused on downstream grooves (such as ribs) and spanwise grooves (such as traveling waves). While significant progress has been made, the preparation of drag-reducing surfaces is primarily achieved through traditional machining methods or grooved film application, leading to numerous problems in practical engineering applications and hindering widespread adoption.

[0003] As early as the late 19th century, it was observed that in some sections of rivers, turbid water flowed faster than clear water. Later, it was discovered that ships experienced reduced surface friction when navigating turbulent waters containing algae. Analysis indicated this was related to the polysaccharide mucus produced by the algae. However, targeted research into drag reduction technologies and agents began in the mid-20th century. In 1948, Toms measured the pressure drop and flow velocity of a polymethyl methacrylate (PMMA) solution in chlorobenzene flowing through a pipe. He discovered that under certain pressures, when in a turbulent state, the flow friction of the polymer solution was lower than that of the pure solvent. He applied for the first patent for polymer drag reduction in 1949, later known as the "Toms phenomenon." In 1963, Svains first gave a clear definition of drag reduction and predicted its application prospects, thus initiating extensive research. Currently, research on polymer drag reduction phenomena has become an interdisciplinary field involving fluid mechanics, rheology, polymer solutions, and polymer chemistry, and the application of drag-reducing agents has become a unique and comprehensive engineering endeavor. Currently, polymer drag reduction has a wide range of applications in fields such as ship navigation, liquid pipeline transportation, oil extraction, fire fighting and biomedicine. However, existing underwater vehicles lack a drag reduction agent injection structure that can stably output polymer drag reduction agents and conform to the surface of the parts to be drag-reduced in the underwater vehicle. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned technical problems and provides a polymer drag-reducing agent injection hydrofoil.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A polymer drag-reducing agent injection hydrofoil includes a hydrofoil body, a flow-stabilizing cavity formed inside the hydrofoil body, several straighteners fixed side-by-side inside the flow-stabilizing cavity, and a cover plate covering the flow-stabilizing cavity. One end of the flow-stabilizing cavity is connected to a solution storage tank inside an underwater vehicle through a discharge channel. The cover plate is parallel to and slidably inserted into the hydrofoil body. The lower surface of the cover plate is in contact with the upper surface of the several straighteners. An injection channel is formed between the outer surface of one end of the cover plate and the inner wall of one end of the flow-stabilizing cavity. A straightening channel is formed between every two adjacent straighteners. The injection channel and the straightening channel are connected.

[0007] Furthermore, the flow stabilizing cavity includes a rectangular section and a conical section connected together, wherein the injection channel is connected to the rectangular section and the discharge channel is connected to the conical section.

[0008] Furthermore, several rectifier plates are fixed within the rectangular section of the flow stabilizing cavity.

[0009] Furthermore, each rectifier plate has transition slopes machined at both ends along its length.

[0010] Furthermore, one end of the cover plate has a circular arc structure.

[0011] Furthermore, the inner wall of one end of the flow stabilizing cavity is an arc surface, and it is tangent to the airfoil body.

[0012] Furthermore, the cross-section of the injection channel is in the shape of a straight line.

[0013] Furthermore, guide rails are integrally fixed to both sides of the cover plate along its length, and slide rails are opened opposite each other on the hydrofoil body along its length, with the guide rails and slide rails slidingly connected.

[0014] Furthermore, the solution storage tank is connected to the discharge channel via a discharge pipe.

[0015] Furthermore, the inner wall of the end of the discharge channel near the flow stabilizing chamber is funnel-shaped.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] When the underwater vehicle is sailing, the release rate of the polymer solution is controlled according to the speed. The polymer solution in the solution storage tank enters the flow stabilization chamber through the discharge channel. The flow stabilization chamber has a flow stabilizing effect on the solution, thereby achieving a stable output of the polymer solution. Subsequently, the polymer solution flows through the rectification channel, and the fluid state is adjusted by the rectifier plate to stabilize the flow of the polymer solution. Then, the polymer solution flows out to the hydrofoil surface through the injection channel, reducing the frictional resistance generated during navigation and achieving the effect of improving the navigation performance of the underwater vehicle.

[0018] The distance between the outer surface of one end of the adjustable cover plate and the inner wall of one end of the flow stabilizing cavity is adjusted, thereby adjusting the width of the injection channel. The position of the cover plate is adjusted according to the amount of drag-reducing agent to be injected based on the speed, so as to change the size of the injection channel and thus change the injection rate of the polymer drag-reducing agent. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention (the cover plate is not shown);

[0020] Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention (the cover plate is not shown);

[0021] Figure 3 This is a top view of the present invention (the cover plate is not shown);

[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the cover plate;

[0023] Figure 5 This is a partial three-dimensional structural diagram of one end of the cover plate;

[0024] Figure 6 This is a left-side view of the cover plate;

[0025] Figure 7 This is a side view of the injection channel.

[0026] In the picture:

[0027] 1. Hydrofoil body; 11. Slide; 2. Flow stabilizing cavity; 21. Rectangular section; 22. Conical section; 3. Flow straightener; 31. Transition slope; 4. Cover plate; 41. Guide rail; 5. Discharge channel; 6. Injection channel; 7. Flow straightener channel; 8. Discharge pipe. Detailed Implementation

[0028] Specific implementation method one: Combining Figures 1 to 7 This description aims to clearly and completely illustrate the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that the descriptions of "left," "right," "left side," "right side," "upper part," "lower part," "top," and "bottom" in this invention are defined based on the orientation or positional relationships shown in the accompanying drawings. They are merely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the described structure must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] A polymer drag-reducing agent injection hydrofoil includes a hydrofoil body 1, a flow-stabilizing cavity 2 formed inside the hydrofoil body 1, a plurality of rectifier plates 3 fixedly arranged side by side inside the flow-stabilizing cavity 2, and a cover plate 4 covering the flow-stabilizing cavity 2. One end of the flow-stabilizing cavity 2 is connected to a solution storage tank inside an underwater vehicle through a discharge channel 5. The cover plate 4 is parallel and slidably inserted into the hydrofoil body 1. The lower surface of the cover plate 4 is attached to the upper surface of the plurality of rectifier plates 3. An injection channel 6 is formed between the outer surface of one end of the cover plate 4 and the inner wall surface of one end of the flow-stabilizing cavity 2. A rectification channel 7 is formed between every two adjacent rectifier plates 3. The injection channel 6 and the rectification channel 7 are connected.

[0032] The polymer drag-reducing agent-injected hydrofoil of the present invention forms a drag-reducing agent injection structure in the boundary layer of the underwater vehicle, which can effectively reduce the frictional resistance generated during the navigation of the underwater vehicle, reduce the energy consumption of the underwater vehicle during navigation, and help to improve the range and maximum speed of the underwater vehicle, thereby improving the overall performance of the underwater vehicle.

[0033] When the underwater vehicle is sailing, the release rate of the polymer solution is controlled according to the speed. The polymer solution in the solution storage tank enters the flow stabilizing chamber 2 through the discharge channel 5. The flow stabilizing chamber 2 has a flow stabilizing effect on the solution, thereby achieving a stable output of the polymer solution. Subsequently, the polymer solution flows through the rectifier channel 7, and the fluid state is adjusted by the rectifier plate 3 to stabilize the flow of the polymer solution. Then, the polymer solution flows out to the hydrofoil surface through the injection channel 6, reducing the frictional resistance generated during navigation and achieving the effect of improving the navigation performance of the underwater vehicle.

[0034] Because the velocity and pressure gradients generated on the hydrofoil surface differ at different speeds, frictional drag also varies with speed. Therefore, it is necessary to adjust the flow rate of the polymer drag-reducing agent solution according to different speed conditions. The distance between the outer surface of one end of the cover plate 4 and the inner wall of one end of the flow stabilizing cavity 2 is adjusted, thereby adjusting the width of the injection channel 6. The position of the cover plate 4 is adjusted according to the amount of drag-reducing agent to be injected based on the speed, thus changing the size of the injection channel 6 and consequently altering the injection rate of the polymer drag-reducing agent.

[0035] The flow stabilizing cavity 2 includes a rectangular section 21 and a conical section 22 connected together. The injection channel 6 is connected to the rectangular section 21, and the discharge channel 5 is connected to the conical section 22. This design, through the conical section 22, allows the polymer drag-reducing agent discharged through the discharge channel 5 to gradually diffuse into the rectifier channel 7, preventing direct discharge from the smaller-diameter discharge channel 5 into the larger-diameter section, thus avoiding turbulence.

[0036] Several rectifier plates 3 are fixed inside the rectangular section 21 of the flow stabilizing cavity 2.

[0037] Each rectifier plate 3 has transition slopes 31 machined at both ends along its length. This design facilitates the entry and exit of the polymer drag-reducing agent into the rectifier channel 7.

[0038] One end of the cover plate 4 has a circular arc structure. This design allows the liquid to flow more smoothly and facilitates the injection of polymer drag-reducing agents.

[0039] One end of the flow-stabilizing cavity 2 has an arc-shaped inner wall that is tangent to the airfoil body 1. This design allows the polymer drag-reducing agent to flow out along the injection channel 6 with a smooth transition wall after exiting the rectifier channel 7. Furthermore, the tangency of the arc-shaped surface with the airfoil body 1 provides a certain guiding effect on the flow direction of the polymer drag-reducing agent, enabling it to flow in close contact with the airfoil surface and further improving the drag reduction effect.

[0040] The cross-section of injection channel 6 is in the shape of a straight line.

[0041] Guide rails 41 are integrally fixed to both sides of the cover plate 4 along its length. Slide tracks 11 are opened on the hydrofoil body 1 along its length, and the guide rails 41 and slide tracks 11 are slidably connected. With this design, the position of the cover plate 4 on the hydrofoil body 1 can be adjusted by the cooperation of the guide rails 41 and slide tracks 11, thereby adjusting the width of the injection channel 6. The width direction of the injection channel 6 is the length direction of the hydrofoil body 1.

[0042] The solution storage tank and the discharge channel 5 are connected by a discharge pipe 8. This design facilitates the connection between the solution storage tank and the flow stabilizing chamber 2.

[0043] The inner wall of the end of the discharge channel 5 near the flow stabilizing chamber 2 is funnel-shaped. This design facilitates the discharge of the polymer drag-reducing agent into the flow stabilizing chamber 2.

[0044] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A polymer drag-reducing agent-injected hydrofoil, characterized in that: The device includes a hydrofoil body (1), a flow stabilizing cavity (2) inside the hydrofoil body (1), several flow straightening plates (3) fixed in parallel inside the flow stabilizing cavity (2), and a cover plate (4) covering the flow stabilizing cavity (2). One end of the flow stabilizing cavity (2) is connected to the solution storage tank inside the underwater vehicle through a discharge channel (5). The cover plate (4) is parallel and slidably inserted into the hydrofoil body (1). The lower surface of the cover plate (4) is attached to the upper surface of several flow straightening plates (3). An injection channel (6) is formed between the outer surface of one end of the cover plate (4) and the inner wall of one end of the flow stabilizing cavity (2). A flow straightening channel (7) is formed between every two adjacent flow straightening plates (3). The injection channel (6) and the flow straightening channel (7) are connected. The flow stabilizing cavity (2) includes a rectangular section (21) and a conical section (22) connected together, wherein the injection channel (6) is connected to the rectangular section (21) and the discharge channel (5) is connected to the conical section (22); Several rectifier plates (3) are fixed inside the rectangular section (21) of the flow stabilizing cavity (2); One end of the cover plate (4) has a circular arc structure; The inner wall of one end of the flow stabilizing cavity (2) is an arc surface and is tangent to the wing surface of the hydrofoil body (1).

2. The polymer drag-reducing agent injection hydrofoil according to claim 1, characterized in that: Each rectifier plate (3) has transition slopes (31) machined at both ends along its length.

3. The polymer drag-reducing agent injection hydrofoil according to claim 1, characterized in that: The cross-section of the injection channel (6) is in the shape of a straight line.

4. The polymer drag-reducing agent injection hydrofoil according to claim 1, characterized in that: Both sides of the cover plate (4) are integrally fixed with guide rails (41) along its length direction. The hydrofoil body (1) is provided with slide rails (11) along its length direction. The guide rails (41) and slide rails (11) are slidably connected.

5. The polymer drag-reducing agent injection hydrofoil according to claim 1, characterized in that: The solution storage tank and the discharge channel (5) are connected by a discharge pipe (8).

6. The polymer drag-reducing agent injection hydrofoil according to claim 1, characterized in that: The inner wall of the end of the discharge channel (5) near the flow stabilizing cavity (2) is funnel-shaped.

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