A Taylor-Cooter flow pattern experimental device

Abstract

The invention discloses a Taylor Coote flow state experimental device, comprising an outer cylinder, an upper end cover, and a lower base, wherein the upper end cover and the lower base are respectively arranged on the upper and lower ends of the outer cylinder to form a fluid flow cavity, the lower surface of the lower base is fixedly connected to one end of a first rotating shaft, and the other end of the first rotating shaft is connected to a first servo motor; an inner cylinder is arranged in the fluid flow cavity, an annular gap for fluid flow is formed between the inner cylinder and the outer cylinder, a second rotating shaft is arranged in the inner cylinder, the lower end of the second rotating shaft is rotatably connected to the lower base, and the upper end of the second rotating shaft is connected to the second servo motor after passing through the upper end cover; a liquid inlet for introducing fluid into the annular gap between the outer cylinder and the inner cylinder is arranged on the upper end cover, a liquid discharge channel for discharging fluid is arranged on the lower base, and a detachable bolt for blocking the fluid is arranged at the external port of the liquid discharge channel. The device can realize the independent setting of the rotation speed and the direction of the double cylinders, the rotation speed is controllable, the width of the annular gap between the two cylinders can be quickly adjusted, and the device has good airtightness and high coaxiality.

Description

Technical Field

[0001] The invention relates to the technical field of fluid mechanics, in particular to a Taylor-Cooter flow state experimental device. Background Art

[0002] The fluid flow between two coaxially rotating cylinders is a classic fluid dynamics problem, called "Taylor-Couette" flow. The fluid in the cylindrical annulus will present laminar flow, Taylor vortex, turbulence and other flow states due to the different rotation modes and rotation speeds of the two cylinders. This process has important academic significance for the study of turbulence, fluid stability, etc. Its complex and changeable flow forms have long been the focus of many researchers. Researchers are still conducting related theoretical analysis, numerical calculations and experimental observation studies. In addition to theoretical research in the direction of fluid mechanics, Taylor-Couette flow can also be widely used in industrial mixing, grinding, extraction and other equipment, such as: filter devices that use eddy currents to reduce concentration polarization, rotating cylindrical electrodes and two-phase emulsified countercurrent liquid extractors, etc., which have important practical application value.

[0003] There are four common forms of two cylinder rotation: the outer cylinder is fixed and the inner cylinder rotates; the inner cylinder is fixed and the outer cylinder rotates; the inner and outer cylinders rotate in the same direction; the inner and outer cylinders rotate in opposite directions. Most of the existing experimental devices only rotate one of the cylinders, and the other cylinder is fixed. The transmission method is mostly belt drive, which cannot achieve independent speed regulation and rotation of the two cylinders. Belt drive has transmission errors and cannot accurately observe the flow distribution in the annular gap under a specified Reynolds number; and most experimental devices have fixed structures and cannot quickly adjust the width of the annular gap between the two cylinders. When different annular gap sizes need to be observed, the device can only be remade or more complicated modifications can be performed, and the device utilization rate is low; finally, since most of the existing experimental devices use through shafts, the device has problems such as leakage of experimental solutions in the annular gap and poor coaxiality. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a Taylor Coote flow state experimental device, which can realize independent setting of the rotation speed and direction of the double cylinders, the rotation speed is controllable, the width of the annular gap between the two cylinders can be quickly adjusted, and the device has good airtightness and high coaxiality.

[0005] The technical solution for achieving the purpose of the present invention is:

[0006] A Taylor Coote flow state experimental device comprises an outer cylinder, an upper end cover and a lower base, wherein the upper end cover and the lower base are respectively arranged on the upper and lower ends of the outer cylinder to form a fluid flow cavity, the lower surface of the lower base is fixedly connected to one end of a first rotating shaft through a flange, the other end of the first rotating shaft passes through a first fixed plate and a second fixed plate in sequence and is connected to a first servo motor through a first coupling; an inner cylinder is arranged in the fluid flow cavity, an annular gap for fluid flow is formed between the inner cylinder and the outer cylinder, a second rotating shaft is arranged in the inner cylinder, the lower end of the second rotating shaft is rotatably connected to the lower base, the upper end of the second rotating shaft passes through the upper end cover and then passes through a third fixed plate and is connected to a second servo motor through a second coupling;

[0007] The upper end cover is provided with a liquid inlet for introducing the fluid into the annular gap between the outer cylinder and the inner cylinder, the lower base is provided with a liquid discharge channel for discharging the fluid, and a detachable bolt for blocking the fluid is provided at the external port of the liquid discharge channel.

[0008] The first rotating shaft is rotatably connected with the first fixed plate and the second fixed plate; a first bearing sleeve is provided between the first rotating shaft and the first fixed plate, and tapered roller bearings are embedded in the upper and lower ends of the first bearing sleeve, and the first rotating shaft and the first fixed plate are rotatably connected through the tapered roller bearings; a bearing seat is provided between the first rotating shaft and the second fixed plate, and a ball bearing is embedded in the bearing seat, and the first rotating shaft and the second fixed plate are rotatably connected through the ball bearings.

[0009] A locking mechanism is provided on the first rotating shaft above the connection portion between the first rotating shaft and the second fixing plate, which is used to keep the outer cylinder in a stationary state when the inner cylinder rotates alone to ensure that it does not rotate and deviate.

[0010] The lower end of the second rotating shaft is arranged in a stepped shape, and the lower base is provided with a stepped groove matching the second rotating shaft, a deep groove ball bearing is embedded in the step of the groove, the bottommost plane of the groove is a semicircular arc surface, and a ball is arranged on the semicircular arc plane, and the second rotating shaft is rotatably connected to the lower base through the deep groove ball bearing and the ball.

[0011] The second rotating shaft is rotatably connected to the third fixed plate, a second bearing sleeve is provided between the second rotating shaft and the third fixed plate, deep groove ball bearings are embedded at the upper and lower ends of the second bearing sleeve, and the second rotating shaft and the third fixed plate are rotatably connected through the deep groove ball bearings.

[0012] The top of the inner cylinder is connected to the second rotating shaft through a key, and a locking ring is provided above the key installation portion of the second rotating shaft to reduce shaking and keep the inner cylinder and the second rotating shaft from moving relative to each other.

[0013] The first fixing plate, the second fixing plate and the third fixing plate are parallel to each other and are respectively fixed on the support frame; the first servo motor and the second servo motor are respectively arranged on the bottom supporting plate and the top supporting plate of the support frame through motor seats.

[0014] The drainage channel is L-shaped, and three drainage channels are evenly arranged on the lower base. The inner wall of the external port is provided with a thread that engages with a detachable butterfly bolt.

[0015] The annular gap spacing between the outer cylinder and the inner cylinder is 2-15mm, a sealing gasket is arranged between the outer cylinder and the lower base and is tightened by bolts, and the outer cylinder is made of transparent material, which is convenient for observing the flow of the fluid during the experiment.

[0016] The present invention provides a Taylor Coote flow state experimental device, which has the following advantages:

[0017] 1. The inner cylinder and the outer cylinder are connected to the servo motor through couplings respectively, which can freely control the direction and speed of the inner and outer cylinders, which is conducive to observing the fluid conditions in the annular gap under the specified Reynolds number;

[0018] 2. The spacing of the annular gap between the outer cylinder and the inner cylinder is adjustable, which is conducive to experimental verification of Taylor-Koot flow under different parameters;

[0019] 3. A sealing gasket is installed between the outer cylinder and the lower base, and is tightened by bolts to ensure the airtightness of the device. The second rotating shaft does not penetrate the lower base, so a complex sealing structure is not required, which avoids the leakage of the experimental solution and reduces the impact of the leakage of the experimental solution on the experiment;

[0020] 4. The cooperation between the bearing sleeve and the first rotating shaft and the second rotating shaft ensures that the rotating shaft will not tilt, reduces bending deformation, and ensures the coaxiality of the device; the end cover on the top can reduce the deformation of the outer cylinder and ensure that the cylinder surface between the two cylinders is horizontal, which is conducive to ensuring the reliability of the experimental results. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a Taylor-Cooter flow experimental device;

[0022] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0023] Figure 3 for Figure 1 Enlarged view of middle part B;

[0024] Figure 4 is a schematic diagram of the structure of the upper end cover;

[0025] In the figure: 1. support frame 2. second fixing plate 3. first fixing plate 4. lower base 5. outer cylinder 6. annular gap 7. inner cylinder 8. upper end cover 9. third fixing plate 10. second servo motor 11. second coupling 12. second bearing sleeve 13. deep groove ball bearing 14. bolt 15. butterfly bolt 16. drainage channel 17. brake caliper 18. bearing seat 19. first coupling 20. first servo motor 21. adjusting foot 22. brake disc 23. first locking ring 24. first rotating shaft 25. second rotating shaft 26. first bearing sleeve 27. tapered roller bearing 28. ball 29. flange 30. second locking ring 31. key 32. liquid inlet 33. hexagon socket screw. DETAILED DESCRIPTION

[0026] The present invention is further described below with reference to the accompanying drawings and embodiments, but the present invention is not limited thereto.

[0027] like Figure 1 As shown, a Taylor Coot flow state experimental device comprises an outer cylinder 5, an upper end cover 8, and a lower base 4. The upper end cover 8 and the lower base 4 are respectively arranged on the upper and lower ends of the outer cylinder 5 to form a fluid flow cavity. Figure 2 As shown, the lower surface of the lower base 4 is fixedly connected to one end of the first rotating shaft 24 through a flange 29, and the other end of the first rotating shaft 24 passes through the first fixing plate 3 and the second fixing plate 2 in sequence and is connected to the first servo motor 20 through the first coupling 19; an inner cylinder 7 is provided in the fluid flow cavity, and an annular gap 6 for fluid flow is formed between the inner cylinder 7 and the outer cylinder 5, and a second rotating shaft 25 is provided in the inner cylinder 7, and the lower end of the second rotating shaft 25 is rotatably connected to the lower base 4, and the upper end of the second rotating shaft 25 passes through the upper end cover 8 and then passes through the third fixing plate 9 and is connected to the second servo motor 10 through the second coupling 11;

[0028] like Figure 4 As shown, the upper end cover 8 is provided with a liquid inlet 32 ​​for introducing the fluid into the annular gap 6 between the outer cylinder 5 and the inner cylinder 7, the edge of the upper end cover 8 is fixedly connected to the outer cylinder by a hexagon socket screw 33, and the lower base 4 is provided with a drainage channel 16 for discharging the fluid, and a detachable butterfly bolt 15 for blocking the fluid is provided at the external port of the drainage channel 16.

[0029] The first rotating shaft 24 is rotatably connected to the first fixing plate 3 and the second fixing plate 2; Figure 2 As shown, a first bearing sleeve 26 is provided between the first rotating shaft 24 and the first fixed plate 3, and tapered roller bearings 27 are embedded in the upper and lower ends of the first bearing sleeve 26, and the first rotating shaft 24 is rotatably connected to the first fixed plate 3 through the tapered roller bearings 27; a bearing seat 18 is provided between the first rotating shaft 24 and the second fixed plate 2, and a ball bearing is embedded in the bearing seat, and the first rotating shaft 24 is rotatably connected to the second fixed plate 2 through the ball bearing.

[0030] The first rotating shaft 24 is provided with a locking mechanism above the connection part with the second fixed plate 2, which is used to keep the outer cylinder in a stationary state when the inner cylinder rotates alone to ensure that it does not rotate and deviate. The locking mechanism can adopt a product with a locking function in the prior art. The locking mechanism adopted in this embodiment includes a brake disc 22, a first locking ring 23 and a brake caliper 17. The brake disc 22 is fixed to the first rotating shaft 24 through the first locking ring 23, and the brake caliper 17 is fixed to the second fixed plate 2 to lock the brake disc 22.

[0031] like Figure 2 As shown, the lower end of the second rotating shaft 25 is arranged in a stepped shape, and the lower base 4 is provided with a stepped groove matching the second rotating shaft 25, and a deep groove ball bearing 13 is embedded in the step of the groove. The bottom plane of the groove is a semicircular arc surface, and a ball 28 is arranged on the semicircular arc plane. The second rotating shaft 25 is rotatably connected to the lower base 4 through the deep groove ball bearing 13 and the ball 28.

[0032] The second rotating shaft 25 is rotatably connected to the third fixed plate 9, and a second bearing sleeve 12 is provided between the second rotating shaft 25 and the third fixed plate 9. Deep groove ball bearings 13 are embedded at the upper and lower ends of the second bearing sleeve 12, and the second rotating shaft 25 and the third fixed plate 9 are rotatably connected through the deep groove ball bearings 13.

[0033] like Figure 3 As shown, the top of the inner cylinder 7 forms a key connection with the second rotating shaft 25 through a key 31, and a second locking ring 30 is provided above the key installation portion of the second rotating shaft 25 to reduce shaking and keep the inner cylinder 7 and the second rotating shaft 25 from moving relative to each other.

[0034] The first fixing plate 3, the second fixing plate 2 and the third fixing plate 9 are parallel to each other and are respectively fixed on the support frame 1; the first servo motor 20 and the second servo motor 10 are respectively arranged on the bottom support plate and the top support plate of the support frame 1 through motor seats, and an adjusting foot 21 is provided at the bottom of the support frame 1.

[0035] The drainage channel 16 is L-shaped, and three drainage channels 16 are evenly arranged on the lower base 4 . The inner wall at the external port is provided with a thread that engages with a detachable butterfly bolt 15 .

[0036] The spacing of the annular gap 6 between the outer tube 5 and the inner tube 7 is 2-15 mm. A sealing gasket is provided between the outer tube 5 and the lower base 4 and is tightened by bolts 14. The outer tube 5 is made of transparent material to facilitate observation of the flow of the fluid during the experiment.

[0037] Embodiment 1:

[0038] First, determine the rotation speed and direction of the inner cylinder 7 and the outer cylinder 5 of this experiment, adjust the corresponding parameters of the controller so that the driver can drive the first servo motor 20 at the bottom of the support frame 1 and the second servo motor 10 at the top to rotate at the specified speed, select the outer cylinder 5 of the corresponding size, so that the width of the annular gap 6 meets the experimental requirements, adjust the adjustment foot 21 at the bottom of the bottom support frame 1 to keep the device as a whole horizontal, inject the experimental solution into the annular gap 6 from the liquid inlet 32 ​​to reach the ideal observation height, and remove the bubbles in the annular gap 6 to ensure that the brake caliper 17 releases the brake disc 22, and then start the first servo motor 20. The first servo motor 20 rotates and the first coupling 19 drives the first rotating shaft 24 to rotate. The first rotating shaft 24 forms an interference fit with the first sleeve 26 and the bearing seat 18 respectively to ensure the coaxiality of the first rotating shaft 24 and reduce shaking. The first rotating shaft 24 drives the flange 29 to rotate, thereby causing the lower base 4 and the outer cylinder 5 to rotate around the axis. At the same time, the second servo motor 10 rotates, and the second rotating shaft 25 is driven to rotate through the second coupling 11. The second rotating shaft 25 forms an interference connection with the deep groove ball bearing 13 inside the second sleeve 12, and the lower end of the second rotating shaft 25 is fixed to the inner surface of the deep groove ball bearing 13 embedded in the lower base 4 to ensure its coaxiality. The ball 28 provides a fulcrum for the second rotating shaft 25 to prevent the second rotating shaft 25 from falling. The second rotating shaft 25 drives the inner cylinder 7 to rotate through the key 31, and the inner cylinder 7 is fixed by the second rotating shaft 25 and the second locking ring 30 to prevent the inner cylinder 7 from moving during the rotation process. When the speed reaches the specified requirement, the Reynolds number can be determined, and the flow state in the annular gap under the condition of double cylinder rotation can be observed, and data can be collected. After the experiment, when the inner cylinder 7 and the outer cylinder 5 are both stationary, the butterfly bolt 15 is opened to discharge the experimental solution, and the experimental device is cleaned up, waiting for the next experiment.

[0039] Embodiment 2:

[0040] First, determine the speed and direction of the inner cylinder 7 of this experiment, adjust the corresponding parameters of the controller so that the driver can drive the second servo motor 10 on the top of the support frame 1 to rotate at the specified speed, select the outer cylinder 5 of the corresponding size, loosen the bolts 14, remove the relevant parts and install a new outer cylinder 5, and tighten the bolts 14 to prevent the device from leaking, so that the width of the annular gap 6 meets the requirements of the experiment, adjust the adjustment foot 21 at the bottom of the support frame 1 to keep the device level as a whole, inject the experimental solution into the annular gap from the liquid inlet 32 ​​to achieve the ideal observation height, and remove the bubbles in the annular gap 6, ensure that the brake caliper 17 fixes the brake disc 22 to achieve the outer cylinder 5 stationary; start the second servo motor 10, and the second servo motor 10 drives the second shaft 25 to rotate through the second coupling 11, and the second The second rotating shaft 25 forms an interference fit with the deep groove ball bearing 13 inside the second sleeve 12, and the lower end of the second rotating shaft 25 is fixed to the inner surface of the deep groove ball bearing 13 embedded in the lower base 4 to ensure its coaxiality. The ball 28 provides a fulcrum for the second rotating shaft 25 to prevent the second rotating shaft 25 from falling. The second rotating shaft 25 drives the inner cylinder 7 to rotate through the key 31, and the inner cylinder 7 is fixed by the second rotating shaft 25 and the second locking ring 30 to prevent the inner cylinder 7 from moving during the rotation process. When the rotation speed reaches the specified requirement, the flow state in the annular gap under the conditions of determining the Reynolds number, fixing the outer cylinder 5, and rotating the inner cylinder 7 can be observed, and data can be collected. After the experiment, when the inner cylinder 7 is stationary, open the butterfly bolt 15 to discharge the experimental solution, clean the experimental device, and wait for the next experiment.

Claims

1. A Taylor Coote flow state experimental device, characterized in that: It comprises an outer cylinder, an upper end cover and a lower base, wherein the upper end cover and the lower base are respectively arranged on the upper and lower ends of the outer cylinder to form a fluid flow cavity, the lower surface of the lower base is fixedly connected to one end of the first rotating shaft through a flange, and the other end of the first rotating shaft passes through the first fixed plate and the second fixed plate in sequence and is connected to the first servo motor through the first coupling; an inner cylinder is arranged in the fluid flow cavity, and an annular gap for fluid flow is formed between the inner cylinder and the outer cylinder, a second rotating shaft is arranged in the inner cylinder, the lower end of the second rotating shaft is rotatably connected to the lower base, and the upper end of the second rotating shaft passes through the upper end cover and then passes through the third fixed plate and is connected to the second servo motor through the second coupling; The upper end cover is provided with a liquid inlet for introducing the fluid into the annular gap between the outer cylinder and the inner cylinder, the lower base is provided with a liquid discharge channel for discharging the fluid, and a detachable bolt for blocking the fluid is provided at the external port of the liquid discharge channel; The first rotating shaft is rotatably connected with the first fixed plate and the second fixed plate; a first bearing sleeve is provided between the first rotating shaft and the first fixed plate, and tapered roller bearings are embedded in the upper and lower ends of the first bearing sleeve, and the first rotating shaft and the first fixed plate are rotatably connected through the tapered roller bearings; a bearing seat is provided between the first rotating shaft and the second fixed plate, and a ball bearing is embedded in the bearing seat, and the first rotating shaft and the second fixed plate are rotatably connected through the ball bearings; The lower end of the second rotating shaft is arranged in a stepped shape, and the lower base is provided with a stepped groove matching the second rotating shaft, a deep groove ball bearing is embedded in the step of the groove, the bottom plane of the groove is a semicircular arc surface, and a ball is arranged on the semicircular arc surface, and the second rotating shaft is rotatably connected to the lower base through the deep groove ball bearing and the ball; The top of the inner cylinder is connected to the second rotating shaft through a key, and a locking ring is provided above the key installation portion of the second rotating shaft to reduce shaking and keep the inner cylinder and the second rotating shaft from moving relative to each other.

2. A Taylor-Cooter flow experimental device according to claim 1, characterized in that: A locking mechanism is provided on the first rotating shaft above the connection portion between the first rotating shaft and the second fixing plate, which is used to keep the outer cylinder in a stationary state when the inner cylinder rotates alone to ensure that it does not rotate and deviate.

3. A Taylor-Cooter flow experimental device according to claim 1, characterized in that: The second rotating shaft is rotatably connected to the third fixed plate, a second bearing sleeve is provided between the second rotating shaft and the third fixed plate, deep groove ball bearings are embedded at the upper and lower ends of the second bearing sleeve, and the second rotating shaft and the third fixed plate are rotatably connected through the deep groove ball bearings.

4. A Taylor-Cooter flow experimental device according to claim 1, characterized in that: The first fixing plate, the second fixing plate and the third fixing plate are parallel to each other and are respectively fixed on the support frame; the first servo motor and the second servo motor are respectively arranged on the bottom supporting plate and the top supporting plate of the support frame through motor seats.

5. The Taylor-Cooter flow experimental device according to claim 1, characterized in that: The drainage channel is L-shaped, and three drainage channels are evenly arranged on the lower base. The inner wall of the external port is provided with a thread that engages with a detachable butterfly bolt.

6. A Taylor-Cooter flow experimental device according to claim 1, characterized in that: The annular gap spacing between the outer cylinder and the inner cylinder is 2-15mm, a sealing gasket is arranged between the outer cylinder and the lower base and is tightened by bolts, and the outer cylinder is made of transparent material, which is convenient for observing the flow of the fluid during the experiment.

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