CN113310661A - Circulating water tank experimental device for realizing flow field refractive index matching flow - Google Patents
Circulating water tank experimental device for realizing flow field refractive index matching flow Download PDFInfo
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- CN113310661A CN113310661A CN202110664440.7A CN202110664440A CN113310661A CN 113310661 A CN113310661 A CN 113310661A CN 202110664440 A CN202110664440 A CN 202110664440A CN 113310661 A CN113310661 A CN 113310661A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
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Abstract
The invention relates to the technical field of fluid mechanics experimental devices, and provides a circulating water tank experimental device for realizing flow field refractive index matching flow, which comprises a first power unit, wherein the power unit is connected with a first transmission unit, the first transmission unit is connected with a second power unit, the second power unit is connected with a second transmission unit, an observation unit is arranged on the second transmission unit, and a flow metering unit is arranged on the first transmission unit; the first transmission unit and the second transmission unit form a closed circulating water tank which enables liquid to flow stably, the first power unit is a vacuum pump, and the vacuum pump is used for pumping vacuum in the closed circulating water tank. The second power unit is a centrifugal pump which is used for driving liquid in the closed circulating water tank to circularly flow, the observation unit is suitable for observing a flow field and observing a test model, and the PIV technology is used for capturing and measuring detail information such as a flow field streaming phenomenon in the closed circulating water tank through the observation unit.
Description
Technical Field
The invention relates to the technical field of fluid mechanics experimental devices, in particular to a circulating water tank experimental device for realizing flow field refractive index matching flow.
Background
The rapid development of computer technology greatly drives the progress of related disciplines such as hydrodynamics and the increasingly perfect experimental technology. In the prior art, a widely applied Particle Image Velocimetry (PIV) technology greatly meets the requirements of dynamic flow field testing, and is convenient for understanding the requirements of spatial structures, such as unsteady vortex structures and turbulent flow structures, so that the flow field calculation and measurement technology is greatly improved.
Considering that the design and the experimental setup of the water tank device are relatively easy, the cost is low, and the water tank device has certain accuracy, so the water tank device is often used for judging the rationality of a numerical simulation result and verifying the normalization, the accuracy and the rigor of a newly proposed experimental device. Through research and development, researchers at home and abroad have made a great deal of work on sink experimental devices. However, most of the basin experiments are open-type, the number of closed-type circulating basins is relatively small, and the number of closed-type circulating basins capable of realizing the flowing of fluids with higher Reynolds numbers is much smaller and smaller. In the prior art, whether the water tank experimental device is an open type or a closed type, the following conditions exist: on one hand, in the high Reynolds number flow, the PIV technology is difficult to capture the flow field details at the position close to the wall surface of the structure in the water tank, and the details can be realized only by high equipment resolution; on the other hand, the experiment is performed in the closed water tank, the structure is complex, and some flow field circumfluence phenomenon in the structure is difficult to see through some outer surface structures of the structure, so that the complexity of researching researchers to explore the flow field in the complex structure in the circulating water tank is greatly increased. Therefore, the improved scheme of the existing circulating water tank has great improvement space for how to measure the detail of the flow field of the internal complex structure.
How to effectively solve the technical problems is a problem to be solved by the technical personnel in the field at present.
Disclosure of Invention
In order to solve the technical problems or at least partially solve the technical problems, the invention provides a circulating water tank experimental device for realizing flow field refractive index matching flow.
The circulating water tank experimental device for realizing flow field refractive index matching flow comprises a first power unit, wherein the first power unit is connected with a first transmission unit, the first transmission unit is connected with a second power unit, and the second power unit is connected with a second transmission unit;
the second transmission unit is provided with an observation unit;
and the first transmission unit is provided with a flow metering unit.
Furthermore, the observation unit comprises an observation frame, a transparent observation window is arranged on the observation frame, and dissolved oxygen measurement equipment is arranged in the observation frame;
and the observation unit is respectively provided with a first observation unit port and a second observation unit port.
Further, a first gradual change pipe is arranged on the second transmission unit close to the port side of the second observation unit.
Furthermore, the first transition pipe comprises a first pipe wall, a first transmission port is arranged on the first pipe wall close to the second observation unit port, the first transmission port is connected with the first observation unit port, and a second transmission port is arranged on the first pipe wall far away from the first observation unit port;
the first transmission port is smaller than the second transmission port.
Furthermore, a second gradual change pipe is connected to the second observation unit port close to the first transmission unit side.
Furthermore, the second transition pipe comprises a second pipe wall, a third transmission port is arranged on the second pipe wall close to the side of the second observation unit port, a fourth transmission port is arranged on the second pipe wall far away from the side of the second observation unit port, the third transmission port is connected with the second observation unit port, and the fourth transmission port is connected with the first transmission unit;
the third transmission port is smaller than the fourth transmission port;
the size of the fourth transmission port is the same as the radial size of the first transmission unit near the fourth transmission port side.
Further, a first bending part and a second bending part are respectively arranged on the first transmission unit;
and a ventilation valve is also arranged on the second transmission unit.
Further, the first bend includes a fifth transfer port and a sixth transfer port, the fifth transfer port and the sixth transfer port being the same size;
the second bend comprises a seventh transfer port and an eighth transfer port, and the seventh transfer port and the eighth transfer port are the same in size and smaller than the fifth transfer port;
the seventh transmission port is smaller than the radial direction of the first transmission unit close to the seventh transmission port, and a first inclined part is arranged between the seventh transmission port and the first transmission unit close to the seventh transmission port.
Furthermore, a third transition pipe is arranged on the second transmission unit, the third transition pipe comprises a third pipe wall, a ninth transmission port is arranged on the third pipe wall close to the observation unit side, and a tenth transmission port is arranged on the third pipe wall close to the first transmission unit side;
the ninth transmission port is larger than the tenth transmission port.
Further, an extension part is further arranged on the second transmission unit close to the third transition pipe, and a detachable closing part is arranged at the end part of the extension part far away from the second power unit side.
In the invention, the first transmission unit and the second transmission unit form a closed circulating water tank, the first power unit is a vacuum pump, and the vacuum pump is used for pumping vacuum in the closed circulating water tank. The second power unit is a centrifugal pump which is used for driving the liquid in the closed circulating water tank to circularly flow. And capturing and measuring detail information such as a flow field streaming phenomenon in the closed circulating water tank through an observation unit by means of a PIV technology.
Drawings
FIG. 1 is a schematic structural diagram of a circulating water tank experimental apparatus for realizing flow field refractive index matching flow provided by the invention;
FIG. 2 is a cylindrical winding flow diagram after matching the refractive index taken by a PIV.
FIG. 3 is a cylindrical winding flow diagram of an unmatched index taken by PIV;
FIG. 4 is a PIV taken refraction map of a glass cylinder with the cylinder edge removed;
reference numerals:
1. a first transmission unit; 11. a first curved portion; 111. a fifth transfer port; 112. a sixth transfer port; 12. a second curved portion; 121. a first inclined portion; 122. a seventh transfer port; 123. an eighth transfer port;
2. a second transmission unit; 21. an extension portion; 211. a closure; 22. a third transition pipe; 221. a ninth transfer port; 222. a tenth transfer port; 223. a third tube wall; 23. a vent valve; 24. a first transition pipe; 241. a second transfer port; 242. a first tube wall; 243. a first transmission port; 25. a second transition pipe; 251. a third transfer port; 252. a second tube wall; 253. a fourth transfer port;
3. a first power unit;
4. a second power unit;
5. an observation unit; 51. a first observation cell port; 52. an observation frame; 53. a transparent observation window; 54. a dissolved oxygen measuring device; 55. a second observation cell port;
6. a flow rate metering unit;
7. a support frame.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The following examples are intended to illustrate the invention, but not to limit it. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "connected" and "coupled" are used broadly and may include, for example, a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In an embodiment provided by the invention, as shown in fig. 1, a circulating water tank experimental apparatus for realizing flow field refractive index matching flow comprises a first power unit 3, wherein the first power unit 3 is connected with a first transmission unit 1, the first transmission unit 1 is connected with a second power unit 4, and the second power unit 4 is connected with a second transmission unit 2;
the second transmission unit 2 is provided with an observation unit 5;
the first transmission unit 1 is provided with a flow metering unit 6.
In this embodiment, the first transfer unit 1 and the second transfer unit 2 form a closed circulation water tank that stabilizes the flow of liquid, and the first power unit 3 is a vacuum pump for evacuating the inside of the closed circulation water tank. The second power unit 4 is a centrifugal pump which is used for driving the liquid in the closed circulating water tank to circularly flow. The observation unit 5 is suitable for observing the flow field and the test model, and the PIV technology can be used for capturing and measuring detail information such as the flow field streaming phenomenon in the closed circulating water tank through the observation unit 5.
In order to control the rotating speed of the centrifugal pump and realize the adjustment of the flow and the flow speed of the liquid, the centrifugal pump can be also connected with a frequency converter.
The first transmission unit 1 and the second transmission unit 2 are arranged on the support frame 7.
In another embodiment of the present invention, as shown in fig. 1, the observation unit 5 includes an observation frame 52, a transparent observation window 53 is disposed on the observation frame 52, and a dissolved oxygen measurement device 54 is disposed in the observation frame 52;
the observation unit 5 is provided with a first observation unit port 51 and a second observation unit port 55, respectively.
In the present embodiment, the observation frame 52, the transparent observation window 53, the first observation unit port 51, and the second observation unit port 55 together constitute the observation unit 5. The dissolved oxygen measuring apparatus 54 employs a dissolved oxygen measuring instrument of the related art for measuring the dissolved oxygen content in the liquid in the observation unit 5.
By means of the PIV technique or the PTV technique, detailed information such as a flow field streaming phenomenon in the closed circulation water tank is captured and measured by the observation unit 5.
The observation frame 52 functions to support the observation unit 5 and also to support other measuring devices to be placed on the observation unit 5. Wherein, observation frame 52 can adopt borosilicate glass material, and transparent observation window 53 adopts the organic glass material among the prior art, except observing unit 5, other parts are stainless steel to guarantee the holistic stability of device and security.
In another embodiment of the present invention, as shown in fig. 1, a first transition pipe 24 is disposed on the second transmission unit 2 near the second observation unit port 55.
In the present embodiment, the first transition pipe 24 enlarges the flow path of the water flowing out from the observation unit 5, thereby assisting to reduce the pressure of the liquid in the observation unit 5 and making the flow of the liquid in the observation unit 5 smoother.
In another embodiment of the present invention, as shown in fig. 1, the first transition pipe 24 includes a first pipe wall 242, a first transmission port 243 is disposed on the first pipe wall 242 near the second observation unit port 55, the first transmission port 243 is connected to the first observation unit port 51, and a second transmission port 241 is disposed on the first pipe wall 242 far from the first observation unit port 51;
the first transfer port 243 is smaller than the second transfer port 241.
In the present embodiment, the first tube wall 242, the first transmission port 243 and the second transmission port 241 together form the first transition tube 24. The first transfer port 243 is smaller than the second transfer port 241, so that the first pipe wall 242 is inclined from the observation unit 5 side to the first power unit 3 side.
In another embodiment of the present invention, as shown in fig. 1, a second transition pipe 25 is connected to a second observation unit port 55 near the first transmission unit 1.
In the present embodiment, the second transition pipe 25 reduces the pressure of the liquid flowing out of the observation unit 5, thereby achieving smoother flow of the liquid in the observation unit 5.
In another embodiment provided by the present invention, as shown in fig. 1, the second transition pipe 25 includes a second pipe wall 252, a third transmission port 251 is disposed on the second pipe wall 252 close to the second observation unit port 55, a fourth transmission port 253 is disposed on the second pipe wall 252 far from the second observation unit port 55, the third transmission port 251 is connected to the second observation unit port 55, and the fourth transmission port 253 is connected to the first transmission unit 1;
the third transfer port 251 is smaller than the fourth transfer port 253;
the size of the fourth transfer port 253 is the same as the radial size of the first transfer unit 1 near the fourth transfer port 253 side.
In the present embodiment, the second tube wall 252, the third transfer port 251 and the fourth transfer port 253 together form the second transition tube 25. The third transfer port 251 is smaller than the fourth transfer port 253, and the second pipe wall 252 is inclined from the second power unit 4 side to the observation unit 5 side.
In another embodiment of the present invention, as shown in fig. 1, the first transmission unit 1 is provided with a first bending portion 11 and a second bending portion 12;
the second transfer unit 1 is also provided with a vent valve 23.
In the present embodiment, the first bending portion 11 redirects the liquid passing through the second gradually-changing pipe 25, thereby reducing the liquid pressure and assisting in achieving the pressure stabilization of the closed-type circulation water tank.
In another embodiment of the present invention, as shown in fig. 1, the first bending portion 11 includes a fifth transfer port 111 and a sixth transfer port 112, and the fifth transfer port 111 and the sixth transfer port 112 have the same size;
the second bending part 12 includes a seventh transfer port 122 and an eighth transfer port 123, and the seventh transfer port 122 and the eighth transfer port 123 are the same size and smaller than the fifth transfer port 111;
the seventh transfer port 122 is smaller than the radial direction of the first transfer unit 1 on the side close to the seventh transfer port 122, and a first slope part 121 is provided between the seventh transfer port 122 and the first transfer unit 1 on the side close to the seventh transfer port 122.
In the present embodiment, the fifth transfer port 111 and the sixth transfer port 112 have the same size, so that the liquid has the same diameter when flowing through the first bending portion 11. The seventh transfer port 122 and the eighth transfer port 123 have the same size and are smaller than the fifth transfer port 111, so that the pipe diameter of the first transfer unit 1 is changed, and thus the fluid flowing through the first inclined portion 121 is pressurized to assist the operation of the second power unit 4.
In another embodiment provided by the present invention, as shown in fig. 1, a third transition pipe 22 is disposed on the second transmission unit 2, the third transition pipe 22 includes a third pipe wall 223, a ninth transmission port 221 is disposed on the third pipe wall 223 near the observation unit 5, and a tenth transmission port 222 is disposed on the third pipe wall 223 near the first transmission unit 1;
the ninth transfer port 221 is larger than the tenth transfer port 222.
In this embodiment, the third transition pipe 22 realizes sudden expansion efficiency density, and reduces the influence of the water pump on the flow pattern.
In still another embodiment of the present invention, as shown in fig. 1, an extension 21 is further provided on the second transmission unit 2 near the third transition pipe 22, and a detachable closing member 211 is provided at an end of the extension 21 far from the second power unit 4 side.
In this embodiment, the extension 21 may be connected to other test equipment or test devices.
In consideration of experimental safety, when the refractive index is prepared, NaI solution is adopted for refractive index matching under the conditions of no toxicity, no corrosion, difficult volatilization, difficult combustion, difficult light refraction and the like. The refractive index of the NaI solution is the same as that of the transparent observation window, and when laser sheet light passes through the interface between the NaI solution and the transparent observation window, the laser sheet light is not influenced by refraction and reflection of light on the surface of the transparent observation window, so that detailed flow field information of the transparent observation window close to the wall surface can be observed in a very detailed manner.
In consideration of the influence of the temperature on the refractive index of the NaI solution, a water cooling device in the prior art can be connected to the second transmission unit 2 near the first gradient tube 24 to adjust the temperature of the NaI solution. The honeycomb device is arranged behind the water cooling device, the damping nets are arranged behind the honeycomb device, the large-scale vortex is divided into small-scale vortices, and the nonuniformity of the incoming flow of the observation unit is reduced.
A vacuum pump is also provided on the second transfer unit 2 adjacent to the first transition duct 24.
The method can be used for researching the detailed flow field information of the cylindrical near-wall fluid circumfluence under the condition of different Reynolds numbers; and the detailed streaming flow field around the rod bundles under different rod bundle arrangement mode conditions and different flow conditions can be obtained.
The above description is not intended to limit the present invention, and it should be finally explained that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments. Those of ordinary skill in the art will understand that: it is to be understood that modifications may be made to the above-described arrangements in the embodiments or equivalents may be substituted for some of the features of the embodiments without departing from the spirit of the present invention.
Claims (10)
1. A circulating water tank experimental device for realizing flow field refractive index matching flow is characterized by comprising a first power unit, wherein the first power unit is connected with a first transmission unit, the first transmission unit is connected with a second power unit, and the second power unit is connected with a second transmission unit;
the second transmission unit is provided with an observation unit;
and the first transmission unit is provided with a flow metering unit.
2. The circulating water tank experimental device for realizing flow field refractive index matching flow according to claim 1,
the observation unit comprises an observation frame, a transparent observation window is arranged on the observation frame, and dissolved oxygen measuring equipment is arranged in the observation frame;
and the observation unit is respectively provided with a first observation unit port and a second observation unit port.
3. The experimental apparatus for a circulating water tank for realizing flow field refractive index matching flow according to claim 2, wherein a first gradually changing pipe is arranged on the second transmission unit near the port side of the second observation unit.
4. The circulating water tank experimental device for realizing flow field refractive index matching flow according to claim 3,
the first transition pipe comprises a first pipe wall, a first transmission port is arranged on the first pipe wall close to the side of the second observation unit port, the first transmission port is connected with the first observation unit port, and a second transmission port is arranged on the first pipe wall far away from the side of the first observation unit port;
the first transmission port is smaller than the second transmission port.
5. The experimental apparatus for a circulating water tank capable of realizing flow field refractive index matching flow according to claim 2, wherein a second gradient tube is connected to the second observation unit port near the first transmission unit side.
6. The circulating water tank experimental device for realizing flow field refractive index matching flow according to claim 5,
the second transition pipe comprises a second pipe wall, a third transmission port is arranged on the second pipe wall close to the side of the second observation unit port, a fourth transmission port is arranged on the second pipe wall far away from the side of the second observation unit port, the third transmission port is connected with the second observation unit port, and the fourth transmission port is connected with the first transmission unit;
the third transmission port is smaller than the fourth transmission port;
the size of the fourth transmission port is the same as the radial size of the first transmission unit near the fourth transmission port side.
7. The circulating water tank experimental device for realizing flow field refractive index matching flow according to claim 2,
the first transmission unit is provided with a first bending part and a second bending part respectively;
and a ventilation valve is also arranged on the second transmission unit.
8. The circulating water tank experimental device for realizing flow field refractive index matching flow according to claim 7,
the first bending part comprises a fifth transmission port and a sixth transmission port, and the size of the fifth transmission port is the same as that of the sixth transmission port;
the second bend comprises a seventh transfer port and an eighth transfer port, and the seventh transfer port and the eighth transfer port are the same in size and smaller than the fifth transfer port;
the seventh transmission port is smaller than the radial direction of the first transmission unit close to the seventh transmission port, and a first inclined part is arranged between the seventh transmission port and the first transmission unit close to the seventh transmission port.
9. The circulating water tank experimental device for realizing flow field refractive index matching flow according to claim 2,
a third transition pipe is arranged on the second transmission unit and comprises a third pipe wall, a ninth transmission port is arranged on the third pipe wall close to the observation unit side, and a tenth transmission port is arranged on the third pipe wall close to the first transmission unit side;
the ninth transmission port is larger than the tenth transmission port.
10. The circulating water tank experimental device for realizing flow field index matching flow according to claim 9, wherein an extension part is further arranged on the second transmission unit close to the third transition pipe, and a detachable closing part is arranged at the end part of the extension part far away from the second power unit side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110664440.7A CN113310661A (en) | 2021-06-16 | 2021-06-16 | Circulating water tank experimental device for realizing flow field refractive index matching flow |
| CN202210685956.4A CN115266018A (en) | 2021-06-16 | 2022-06-16 | Circulating water tank experimental device and method for realizing flow field refractive index matching |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110664440.7A CN113310661A (en) | 2021-06-16 | 2021-06-16 | Circulating water tank experimental device for realizing flow field refractive index matching flow |
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| CN202110664440.7A Pending CN113310661A (en) | 2021-06-16 | 2021-06-16 | Circulating water tank experimental device for realizing flow field refractive index matching flow |
| CN202210685956.4A Pending CN115266018A (en) | 2021-06-16 | 2022-06-16 | Circulating water tank experimental device and method for realizing flow field refractive index matching |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114739627A (en) * | 2022-03-16 | 2022-07-12 | 中国农业大学 | Optical matching calibration method and device for internal flow field of complex structure |
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| CN112595488A (en) * | 2020-11-22 | 2021-04-02 | 上海应用技术大学 | Small-size experiment circulating water tank |
| CN112798225A (en) * | 2021-01-21 | 2021-05-14 | 中国人民解放军海军工程大学 | Vertical tandem double-test-section cavity water tunnel test device |
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2021
- 2021-06-16 CN CN202110664440.7A patent/CN113310661A/en active Pending
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- 2022-06-16 CN CN202210685956.4A patent/CN115266018A/en active Pending
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| CA2130056A1 (en) * | 1994-08-12 | 1996-02-13 | Robert Newbury | Streamlab hydraulic demonstration flume |
| CN202720106U (en) * | 2012-08-21 | 2013-02-06 | 广东海洋大学 | Miniature enclosed horizontal cycle water tank apparatus |
| CN104390762A (en) * | 2014-11-24 | 2015-03-04 | 哈尔滨工业大学 | Experimental device for fine mechanical flow field measurement for fluid |
| CN107063629A (en) * | 2017-04-12 | 2017-08-18 | 江苏科技大学 | A kind of drag reduction surface performance testing device under water |
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| CN114739627A (en) * | 2022-03-16 | 2022-07-12 | 中国农业大学 | Optical matching calibration method and device for internal flow field of complex structure |
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| CN115266018A (en) | 2022-11-01 |
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