Wall-mounted Karman vortex single-body and multi-body group comprehensive experiment device

Abstract

The utility model provides a wall-mounted Karman vortex single-body and multi-body group comprehensive experiment device, and belongs to the technical field of experiment demonstration. The wall-mounted Karman vortex single-body and multi-body group comprehensive experiment device comprises a wall-mounted structure and a flow demonstration structure. The wall hanging structure comprises a fixing plate, a supporting plate and an inflation part, the supporting plate is installed on the fixing plate in a hanging mode, and the inflation part is installed on the water storage tank and the circulation part. The flow demonstration structure comprises a transparent cover, a flow stabilizing piece and backflow pipes, the transparent cover is fixed on the supporting plate, a transparent frame is fixed in the transparent cover, backflow holes are formed in the upper end of the transparent frame, and the backflow pipes are fixed in the transparent cover and located on the two sides of the transparent frame. According to the utility model, the stability of water flow can be kept in the demonstration process, the phenomena of streaming and Karman vortex street fluid can be observed more conveniently and visually along with the generation of bubbles, and the demonstration instrument is more convenient in the use process.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental demonstration, in particular to a wall-mounted Karman vortex single body and multi-body group comprehensive experimental device. Background Art

[0002] The wall-mounted Karman vortex single body and multi-body group comprehensive experimental device uses a speed-regulating water pump for water supply, and the flow display surface can demonstrate the flow images of single cylinder flow and multi-cylinder flow. Cylindrical flow is the characteristic flow spectrum of this type of demonstrator. The existing technology can only observe the boundary separation of cylindrical flow under laminar flow conditions, and cannot demonstrate the spectrum of cylindrical flow under turbulent conditions. It is difficult to intuitively observe the Karman vortex street fluid phenomenon of comparing single cylinder flow with multi-cylinder flow. For this reason, it is necessary to propose a wall-mounted Karman vortex single body and multi-cylinder group comprehensive experimental device to solve the above problems. Utility Model Content

[0003] In order to make up for the above shortcomings, the utility model provides a wall-mounted Karman vortex single-body and multi-body group comprehensive experimental device, which aims to improve the problem that the prior art can only observe the boundary separation of cylindrical flow under laminar flow conditions, cannot demonstrate the spectrum of cylindrical flow under turbulent conditions, and is difficult to intuitively observe the Karman vortex street fluid phenomenon by comparing the flow around a single cylinder with the flow around multiple cylinders.

[0004] The utility model is achieved in this way:

[0005] The utility model provides a wall-mounted Karman vortex single body and multi-body group comprehensive experimental device, comprising a wall-mounted structure and a flow demonstration structure.

[0006] The wall-mounted structure includes a fixed plate, a support plate and an inflatable member. The support plate is suspended on the fixed plate. A water tank is fixed at the lower end of the support plate. A water filling hole is provided on the top surface of the water tank. A circulation member is installed inside the water tank. The inflatable member is installed on the water tank and the circulation member. The flow demonstration structure includes a transparent cover, a flow stabilizing member and a return pipe. The transparent cover is fixed on the support plate. A transparent frame is fixed inside the transparent cover. A flow guide channel is formed between the transparent frame and the support plate. A return hole is formed at the upper end of the transparent frame. The bottom of the flow guide channel is connected to the circulation member through a conical connecting pipe. The flow stabilizing member is fixed inside the flow guide channel. A flow bypass column and a Karman vortex street column are fixed inside the flow guide channel. The return pipe is fixed inside the transparent cover and located on both sides of the transparent frame.

[0007] In an embodiment of the utility model, the fixing plate is installed and fixed on a wall, and a hanging column is fixed to the upper end of the fixing plate.

[0008] In one embodiment of the utility model, a connecting strip is symmetrically fixed to one side of the support plate, matching nail holes are provided inside the connecting strip and the fixing plate, a wall hanging plate is fixed to the upper end of the support plate, a hanging hole matching the hanging column is provided inside the wall hanging plate, and the hanging hole is hung on the hanging column.

[0009] In one embodiment of the utility model, a water level observation hole is opened on one side of the water storage tank, and a transparent plate is embedded in the water level observation hole.

[0010] In one embodiment of the utility model, the circulation component includes a water pump and a Rafael tube, the water pump is installed inside the water tank, the Rafael tube is connected to the output end of the water pump, and the Rafael tube is connected to the conical connecting pipe.

[0011] In one embodiment of the utility model, the inflatable component includes an air pump and an air pipe, the air pump is installed on the top surface of the water tank, the air pipe is installed at the output end of the air pump, and the air pipe runs through the water tank and is connected to the Rafale tube.

[0012] In one embodiment of the utility model, the flow stabilizing member includes a first water stabilizing flow channel and a second water stabilizing flow channel, both of which are installed inside the flow guide channel, the first water stabilizing flow channel is close to the conical connecting pipe mouth, and the second water stabilizing flow channel is located between the flow column and the Karman vortex street column.

[0013] In an embodiment of the present invention, the Karman vortex street columns are distributed in a matrix pattern inside the flow guide channel.

[0014] The beneficial effect of the utility model is that the utility model obtains a wall-mounted Karman vortex single body and multi-body group comprehensive experimental device through the above design. When in use, the circulation part and the inflation part work to transport the water and bubbles inside the water tank to the guide channel for upward flow. In the upward flow process, it passes through the first water stabilizing flow channel, the flow column, the second water stabilizing flow channel and the Karman vortex street column in sequence. The water flow is kept stable when passing through the flow stabilizing part. When passing through the flow column, a flow will be formed at its front and rear ends. The flow rate of the water pump and the air pump is adjusted by the knob to observe the boundary layer separation on the surface of the flow column under different flow rates. When passing through the Karman vortex street columns distributed in a matrix, a Karman vortex street fluid phenomenon will be formed. Then the experimental water enters the return pipe through the return hole and returns to the water tank. In this way, the water flow can be kept stable during the demonstration. At the same time, the generation of bubbles makes it more convenient and intuitive to observe the flow and Karman vortex street fluid phenomena, which is more convenient during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic structural diagram of a wall-mounted Karman vortex single body and multi-body group comprehensive experimental device from a first perspective provided by an embodiment of the utility model;

[0017] Figure 2 A schematic diagram of a partial cross-sectional structure of a wall-mounted Karman vortex single body and multi-body group comprehensive experimental device from a first viewing angle provided by an embodiment of the utility model;

[0018] Figure 3 A schematic diagram of the exploded structure of a wall-mounted Karman vortex single body and multi-body group comprehensive experimental device from a second perspective provided by an embodiment of the utility model;

[0019] Figure 4 A schematic diagram of the partial cross-sectional structure from a second perspective of a wall-mounted Karman vortex single-body and multi-body group comprehensive experimental device provided in an embodiment of the utility model.

[0020] In the figure: 100-wall-mounted structure; 110-fixed plate; 111-suspension column; 120-support plate; 121-connecting strip; 122-nail hole; 123-wall-mounted plate; 124-hanging hole; 130-water storage tank; 131-water level observation hole; 140-circulation part; 141-water pump; 142-Rafale tube; 150-inflatable part; 151-air pump; 152-air pipe; 200-flow demonstration structure; 210-transparent cover; 220-transparent frame; 221-flow guide channel; 222-conical connecting pipe; 223-return hole; 230-flow stabilizing part; 231-first water stabilizing flow channel; 232-second water stabilizing flow channel; 240-flow around column; 250-Karman vortex street column; 260-return pipe. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0022] See also Figure 1-Figure 4 The utility model provides a technical solution: a wall-mounted Karman vortex single body and multi-body group comprehensive experimental device, including a wall-mounted structure 100 and a flow demonstration structure 200.

[0023] See also Figure 1-Figure 4 The wall-mounted structure 100 includes a fixing plate 110, a supporting plate 120 and an inflatable member 150. The supporting plate 120 is suspended on the fixing plate 110. A water tank 130 is fixed to the lower end of the supporting plate 120. A water filling hole is opened on the top surface of the water tank 130. A circulation member 140 is installed inside the water tank 130. The inflatable member 150 is installed on the water tank 130 and the circulation member 140.

[0024] The fixing plate 110 is installed and fixed on the wall, and a hanging column 111 is fixed to the upper end of the fixing plate 110; a connecting strip 121 is symmetrically fixed to one side of the supporting plate 120, and matching nail holes 122 are provided inside the connecting strip 121 and the fixing plate 110; a wall-mounted plate 123 is fixed to the upper end of the supporting plate 120, and a hanging hole 124 matching the hanging column 111 is provided inside the wall-mounted plate 123, and the hanging hole 124 is hung on the hanging column 111. Here, the setting of the hanging hole 124 and the hanging column 111 can facilitate hanging and thus facilitate observation.

[0025] A water level observation hole 131 is provided on one side of the water storage tank 130, and a transparent plate is embedded in the water level observation hole 131. The water level observation hole 131 can be conveniently observed in time, so as to facilitate water level addition. The circulation member 140 includes a water pump 141 and a Rafael tube 142. The water pump 141 is installed inside the water storage tank 130. The Rafael tube 142 is connected to the output end of the water pump 141. The Rafael tube 142 is connected to the conical connecting pipe 222. The circulation member 140 can facilitate water circulation operation. The inflatable component 150 includes an air pump 151 and an air pipe 152. The air pump 151 is installed on the top surface of the water tank 130, and the air pipe 152 is installed at the output end of the air pump 151. The air pipe 152 runs through the water tank 130 and is connected to the Rafale tube 142. The air pump 151 can conveniently perform air replenishment operation on the Rafale tube 142. Here, the water pump 141 and the air pump 151 are both provided with flow adjustable knobs for adjusting the flow of the water pump 141 and the air pump 151. The reflux pipe 260 is fixed inside the transparent cover 210 and is located on both sides of the transparent frame 220. Here, the upper end of the reflux pipe 260 is connected to the reflux hole 223 to facilitate the reflux of experimental water.

[0026] See also Figure 1-Figure 4The flow demonstration structure 200 includes a transparent cover 210, a flow stabilizer 230 and a reflux pipe 260. The transparent cover 210 is fixed on the support plate 120. A transparent frame 220 is fixed inside the transparent cover 210. A flow guide channel 221 is formed between the transparent frame 220 and the support plate 120. A reflux hole 223 is formed at the upper end of the transparent frame 220. The bottom of the flow guide channel 221 is connected to the circulation member 140 through a conical connecting pipe 222. The flow stabilizer 230 is fixed inside the flow guide channel 221. A flow column 240 and a Karman vortex street column 250 are fixed inside the flow guide channel 221.

[0027] The flow stabilizer 230 includes a first water stabilizing flow channel 231 and a second water stabilizing flow channel 232, both of which are installed inside the flow guide channel 221, the first water stabilizing flow channel 231 is close to the conical connecting pipe 222, and the second water stabilizing flow channel 232 is located between the flow circumference column 240 and the Karman vortex street column 250. The arrangement of the flow stabilizer 230 can improve the stability of water flow passing through the flow circumference column 240 and the Karman vortex street column 250. The Karman vortex street column 250 is distributed in a matrix shape inside the flow guide channel 221, and the matrix-distributed Karman vortex street column 250 will produce a Karman vortex street fluid phenomenon when water flows through.

[0028] Specifically, the working principle of the wall-mounted Karman vortex single body and multi-body group comprehensive experimental device is as follows: when in use, the water pump 141 and the air pump 151 are working, the water pump 141 transports the water inside the water tank 130 to the inside of the Rafale tube 142, and at the same time the air pump 151 transports the external air to the inside of the Rafale tube 142 through the air pipe 152 to generate bubbles, and transports the bubbles to the guide channel 221 through the conical connecting pipe 222 to flow upward, and in the process of flowing upward, it passes through the first water stabilizing flow channel 231, the flow column 240, the second water stabilizing flow channel 232 and the Karman vortex street column 250 in sequence, and passes through the first water stabilizing flow channel 231 and the second water stabilizing flow channel 232. The water flow can be kept stable when passing through the flow channel 232. When passing through the vortex column 240, vortex will be formed at its front and rear ends. The flow rates of the water pump 141 and the air pump 151 can be adjusted by the knob to observe the boundary layer separation on the surface of the vortex column 240 under different flow rates. When passing through the matrix-distributed Karman vortex street column 250, a Karman vortex street fluid phenomenon will be formed. Then the experimental water enters the reflux pipe 260 through the reflux hole 223 and returns to the water tank 130. In this way, the water flow can be kept stable during the demonstration. At the same time, the generation of bubbles makes it more convenient and intuitive to observe the vortex and Karman vortex street fluid phenomena, which is more convenient during use.

[0029] It should be noted that the specific models and specifications of the water pump 141 and the air pump 151 need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0030] The power supply and principle of the water pump 141 and the air pump 151 are clear to those skilled in the art and will not be described in detail here.

[0031] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A wall-mounted Karman vortex single body and multi-body group comprehensive experimental device, comprising a wall-mounted structure (100) and a flow demonstration structure (200) mounted on the wall-mounted structure (100), characterized in that: The wall-mounted structure (100) comprises a fixing plate (110), a supporting plate (120) and an inflatable member (150); the supporting plate (120) is suspended and mounted on the fixing plate (110); a water storage tank (130) is fixed to the lower end of the supporting plate (120); a water filling hole is provided on the top surface of the water storage tank (130); a circulation member (140) is installed inside the water storage tank (130); and the inflatable member (150) is mounted on the water storage tank (130) and the circulation member (140); The flow demonstration structure (200) comprises a transparent cover (210), a flow stabilizing member (230) and a return pipe (260); the transparent cover (210) is fixed on the support plate (120); a transparent frame (220) is fixed inside the transparent cover (210); a flow guide channel (221) is formed between the transparent frame (220) and the support plate (120); a return hole (223) is formed at the upper end of the transparent frame (220); the bottom of the flow guide channel (221) is connected to the circulation member (140) via a conical connecting pipe (222); the flow stabilizing member (230) is fixed inside the flow guide channel (221); a flow column (240) and a Karman vortex street column (250) are fixed inside the flow guide channel (221); and the return pipe (260) is fixed inside the transparent cover (210) and is located on both sides of the transparent frame (220).

2. A wall-mounted Karman vortex single body and multi-body group comprehensive experimental device according to claim 1, characterized in that: The fixing plate (110) is installed and fixed on a wall, and a hanging column (111) is fixed to the upper end of the fixing plate (110).

3. A wall-mounted Karman vortex single body and multi-body group comprehensive experimental device according to claim 2, characterized in that: A connecting strip (121) is symmetrically fixed to one side of the support plate (120), and matching nail holes (122) are provided inside the connecting strip (121) and the fixing plate (110). A wall hanging plate (123) is fixed to the upper end of the support plate (120), and a hanging hole (124) matching the hanging column (111) is provided inside the wall hanging plate (123), and the hanging hole (124) is hung on the hanging column (111).

4. A wall-mounted Karman vortex single body and multi-body group comprehensive experimental device according to claim 1, characterized in that: A water level observation hole (131) is provided on one side of the water storage tank (130), and a transparent plate is embedded inside the water level observation hole (131).

5. The wall-mounted Karman vortex single body and multi-body group comprehensive experimental device according to claim 1, characterized in that: The circulation member (140) comprises a water pump (141) and a Rafael tube (142); the water pump (141) is installed inside the water storage tank (130); the Rafael tube (142) is connected to the output end of the water pump (141); and the Rafael tube (142) is in communication with the conical connecting tube (222).

6. A wall-mounted Karman vortex single body and multi-body group comprehensive experimental device according to claim 5, characterized in that: The inflatable member (150) comprises an air pump (151) and an air pipe (152); the air pump (151) is installed on the top surface of the water storage tank (130); the air pipe (152) is installed at the output end of the air pump (151); the air pipe (152) passes through the water storage tank (130) and is in communication with the Rafale tube (142).

7. The wall-mounted Karman vortex single body and multi-body group comprehensive experimental device according to claim 1, characterized in that: The flow stabilizing member (230) comprises a first water stabilizing flow channel (231) and a second water stabilizing flow channel (232); the first water stabilizing flow channel (231) and the second water stabilizing flow channel (232) are both installed inside the flow guide channel (221); the first water stabilizing flow channel (231) is close to the opening of the tapered connecting pipe (222); and the second water stabilizing flow channel (232) is located between the flow bypass column (240) and the Karman vortex street column (250).

8. The wall-mounted Karman vortex single body and multi-body group comprehensive experimental device according to claim 1, characterized in that: The Karman vortex street columns (250) are distributed in a matrix pattern inside the flow guide channel (221).

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