CN113655237B - Flat-loop pipeline water flow velocity measuring device compatible with LDV and PIV technologies - Google Patents
Flat-loop pipeline water flow velocity measuring device compatible with LDV and PIV technologies Download PDFInfo
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- CN113655237B CN113655237B CN202110777463.9A CN202110777463A CN113655237B CN 113655237 B CN113655237 B CN 113655237B CN 202110777463 A CN202110777463 A CN 202110777463A CN 113655237 B CN113655237 B CN 113655237B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 190
- 238000005516 engineering process Methods 0.000 title claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 36
- 238000013016 damping Methods 0.000 claims abstract description 11
- 239000012780 transparent material Substances 0.000 claims abstract description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 13
- 239000011521 glass Substances 0.000 claims description 11
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 4
- 229920005372 Plexiglas® Polymers 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 description 10
- 239000012530 fluid Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000000700 radioactive tracer Substances 0.000 description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 229920001875 Ebonite Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000037406 food intake Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000013003 hot bending Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 208000014733 refractive error Diseases 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000000827 velocimetry Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Aviation & Aerospace Engineering (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a flat-loop pipeline water flow velocity measuring device compatible with LDV and PIV technologies, which belongs to a complex pipeline flow velocity measuring device and is used for measuring flow velocity, and comprises a pipeline, a water jacket assembly and a damping device, wherein the pipeline is made of transparent materials and is positioned in the water jacket assembly, and the water jacket assembly is a multi-section independent cover body structure which is made of transparent materials and distributed along the pipeline; each section of independent cover structure at least comprises two groups of planes which are parallel to each other and is filled with water; the damping device is positioned at the bottom of the water jacket assembly and is in contact with the horizontal plane. In view of the technical scheme, the invention can eliminate the problems of difficult measurement caused by refraction problem of the outer wall of the bent pipeline and vibration of an experimental system caused by movement of water flow in the pipe when the LDV or PIV is used for measuring the flow velocity of the flow field in the transparent bent pipe, and realize the non-contact measurement of the water flow velocity in the complex horizontal pipeline.
Description
Technical Field
The application belongs to a complex pipeline flow velocity measuring device, and particularly relates to a flat-loop pipeline water flow velocity measuring device compatible with LDV and PIV technologies.
Background
In the field of fluid mechanics, flow velocity is the most fundamental and important physical quantity for studying fluid flow characteristics. The current flow rate measurement methods commonly used in the field of incompressible fluid mechanics research mainly comprise Pitot tube speed measurement, LDV speed measurement and PIV speed measurement. Although the pitot tube speed measurement has the advantages of simple structure, convenient use and manufacture, low cost and the like, the probe is required to be placed in the flow field in the measurement process, disturbance can be generated to the flow field, the pitot tube speed measurement can only be used for calculating the average flow velocity of water flow, and the requirements of high-precision and transient measurement of the point flow velocity in scientific research experiments can not be met.
Compared with pitot tube velocity measurement, LDV velocity measurement and PIV velocity measurement are widely used fluid flow velocity measurement methods in the current hydrodynamic field, and are both characterized in that trace particles are added into fluid, and the velocity of the trace particles can be regarded as the flow velocity of the fluid when the following property of the trace particles in the fluid is good by measuring the motion velocity of the trace particles in the fluid.
LDV and PIV speed measurement are still distinctive. Specifically, LDV velocimetry is to calculate the three-dimensional velocity of a trace particle by using the doppler shift of scattered light formed by laser on the missing particle when the trace particle moves in a fluid, so as to obtain the three-dimensional velocity at a specific spatial point in a flow field. PIV velocity measurement is to record the images of the tracer particles in two or more instantaneous planar areas by adopting a CCD image sensor, and calculate the displacement of the tracer particles in a specific time interval by correlation or cross correlation in a computer, so as to obtain the three-dimensional velocity of the tracer particles in the whole planar area.
The LDV or PIV speed measurement is required to ensure that the laser incidence does not generate measurement errors due to laser refraction in the measurement process, so that the laser incidence surface is required to be kept flat and perpendicular to the plane of the incidence optical fiber. Meanwhile, the measurement error possibly caused by the vibration of the pipeline caused by the water flow motion in the pipeline is reduced as much as possible in the measurement process, and if the water-containing bent pipe section is involved, the refraction of the pipe wall is more complex because the bent pipe structure is a torus, so that the measurement of the water flow velocity in the complex horizontal pipeline becomes more difficult by adopting the LDV and PIV technology.
Disclosure of Invention
The application aims to provide a flat-loop pipeline water flow velocity measuring device compatible with LDV and PIV technologies, which can eliminate the problems of difficult measurement caused by refraction problem of the outer wall of a bent pipeline and experimental system vibration caused by water flow motion in the pipeline when the LDV or PIV is used for measuring the flow velocity of a flow field in a transparent bent pipeline, and realize the non-contact measurement of the water flow velocity in a complex horizontal pipeline.
In order to achieve the above purpose, the application is realized by the following technical scheme:
The invention relates to a flat-loop pipeline water flow velocity measuring device compatible with LDV and PIV technologies, which comprises a pipeline, a water jacket assembly and a damping device, wherein the pipeline is made of transparent materials and is positioned in the water jacket assembly, and the water jacket assembly is of a multi-section independent cover body structure which is made of transparent materials and distributed along the pipeline; each section of independent cover structure at least comprises two groups of planes which are parallel to each other and is filled with water; the damping device is positioned at the bottom of the water jacket assembly and is in contact with the horizontal plane.
Further, the pipeline comprises a horizontal straight pipe section and a bent pipe section, wherein the horizontal straight pipe section is positioned at two ends of the bent pipe section.
Further, the bent pipe section in the invention is a 180-degree bent pipe.
Furthermore, the water jacket assembly comprises a water jacket top plate and a water jacket bottom plate which are arranged in parallel, wherein the water jacket top plate and the water jacket bottom plate are horizontally arranged, water jacket vertical surfaces are respectively fixed on the inner side and the outer side of the water jacket top plate and the water jacket bottom plate, two ends of the water jacket top plate and the water jacket bottom plate are respectively fixedly connected with a pipeline through water jacket side surfaces, and the water jacket side surfaces are respectively fixed with the water jacket top plate, the water jacket bottom plate and the ends of the water jacket vertical surfaces.
Furthermore, the water jacket top plate and the water jacket vertical surface are connected through the buckle at the bottom edge of the water jacket top plate, and the buckle of the water jacket top plate is composed of two strip-shaped bulges which are arranged in parallel.
Furthermore, the water jacket top plate and the adjacent water jacket vertical surfaces are connected through the connecting pieces, the connecting pieces are respectively positioned on the water jacket top plate and the water jacket vertical surfaces, and the aligned connecting pieces are fixed through the bolt components.
Furthermore, the vertical surfaces of the adjacent water jackets are fixed through the reinforcing sheets, and the reinforcing sheets are plate bodies with bending structures.
Further, the pipeline in the invention is an organic glass pipe; the water jacket assembly is made of plexiglass plates.
Furthermore, the connection position of the vertical surface of the water jacket and the bottom plate of the water jacket is reinforced by using organic glass reinforcing strips.
Further, the top plate of the water jacket is trapezoidal.
Compared with the prior art, the application has the beneficial effects that:
1. The invention can effectively eliminate the measurement difficulty caused by the refraction problem of the outer wall of the bent pipeline when the flow field in the transparent bent pipe is measured by LDV speed measurement or PIV speed measurement.
2. The invention comprehensively considers the measuring methods of LDV speed measurement and PIV speed measurement, and can simultaneously meet the technical requirements of the two speed measuring methods on speed measurement.
3. According to the invention, the structural forms including the reinforcing sheet, the connecting sheet and the like are arranged in the water jacket assembly, so that the deformation of the side wall of the water jacket organic glass caused by the water pressure of the water jacket is effectively prevented.
4. According to the invention, by arranging the damping device, the vibration of the experimental system caused by the flow of water in the experimental process can be effectively restrained, and the accuracy of experimental results can be improved.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic diagram of a second embodiment of the present invention.
In the figure: 1. a pipe; 2. a water jacket assembly; 3. and a damping device.
11. A horizontal straight pipe section; 12. a curved pipe section; 21. a water jacket side surface; 22. a water jacket top plate; 23. a water jacket vertical surface; 24. a connecting piece; 25. a bolt assembly; 26. a reinforcing sheet; 27. a water jacket bottom plate.
Detailed Description
The technical scheme of the application is further described and illustrated below with reference to the accompanying drawings and the embodiments. It should be noted that, the terms possibly related to the following paragraphs include, but are not limited to, "up, down, left, right, front, back" and the like, and the directions according to which the terms are all visual directions shown in the drawings of the corresponding specification, which should not be construed as limiting the scope of protection of the present technical solution, but are only for facilitating the understanding of the technical solution described in the specification by those skilled in the art.
In the description of the following paragraphs, unless expressly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in view of the specific circumstances in combination with common general knowledge in the art, design specifications, standard documents, etc.
Example 1
The utility model provides a compatible LDV and PIV technique's return bend pipeline rivers velocity of flow measuring device, includes pipeline 1, water jacket subassembly 2, bradyseism device 3, wherein pipeline 1 be by transparent material and be located water jacket subassembly 2, water jacket subassembly 2 is the multistage independent cover body structure of being made by transparent material and distributing along pipeline 1; each section of independent cover structure at least comprises two groups of planes which are parallel to each other and is filled with water; the damping device 3 is positioned at the bottom of the water jacket assembly 2 and is in contact with the horizontal plane.
Example 2
The flat-bent pipeline water flow velocity measuring device compatible with LDV and PIV technologies comprises a pipeline 1, a pipeline control device and a pipeline control device, wherein the pipeline 1 comprises a horizontal straight pipe section 11 and a bent pipe section 12, and the horizontal straight pipe section 11 is positioned at two ends of the bent pipe section 12; the bent pipe section 12 is a 180-degree bent pipe; the water jacket assembly 2 comprises a water jacket top plate 22 and a water jacket bottom plate 27 which are arranged in parallel, wherein water jacket vertical surfaces 23 are respectively fixed on the inner side and the outer side of the water jacket top plate 22 and the water jacket bottom plate 27, two ends of the water jacket top plate 22 and the water jacket bottom plate 27 are respectively fixedly connected with the pipeline 1 through water jacket side surfaces 21, and the water jacket side surfaces 21 are respectively fixed with the end parts of the water jacket top plate 22, the water jacket bottom plate 27 and the water jacket vertical surfaces 23; the water jacket top plate 22 is connected with the water jacket vertical surface 23 through a buckle at the bottom edge of the water jacket top plate 22, and the buckle of the water jacket top plate 22 is composed of two strip-shaped bulges which are arranged in parallel; the water jacket top plate 22 is connected with the adjacent water jacket vertical surfaces 23 through connecting pieces 24, the connecting pieces 24 are respectively positioned on the water jacket top plate 22 and the water jacket vertical surfaces 23, and the aligned connecting pieces 24 are fixed through bolt assemblies 25; the adjacent water jacket vertical surfaces 23 are fixed through reinforcing sheets 26, and the reinforcing sheets 26 are plate bodies with bending structures; the pipeline 1 is a plexiglass pipe; the water jacket assembly 2 is made of a plexiglass plate; the connection position of the water jacket vertical surface 23 and the water jacket bottom plate 27 is reinforced by using organic glass reinforcing strips; the water jacket top plate 22 is trapezoidal. The structure and connection relationship of the rest are the same as those described in any one of the foregoing embodiments, and are not repeated here to avoid complicated text.
On the basis of the above embodiments, the technical features involved therein and the functions and roles that the technical features play in the technical solution are described in detail using the following paragraphs so as to help those skilled in the art to fully understand the technical solution and reproduce it.
As shown in fig. 1 to 2, the flat-loop pipeline water flow velocity measuring device compatible with LDV and PIV technology in the present invention comprises a pipeline 1, wherein the pipeline 1 is composed of a horizontal straight pipe section 11 and a curved pipe section 12, and the horizontal straight pipe section 11 is positioned upstream and downstream of the curved pipe section 12 and is integrated with the curved pipe section 12. The pipe 1 is made of organic glass, wherein the bent pipe section 12 is a 180-degree bent pipe.
In the invention, the water jacket assembly 2 is formed by four sections distributed along the pipeline 1, the four sections of water jacket assemblies 2 can completely wrap the bent pipe sections 12 of the pipeline 1, and every two adjacent sections of water jacket assemblies 2 are connected through the water jacket side surfaces 21. Each section of water jacket assembly 2 comprises a water jacket top plate 22, a water jacket bottom plate 27, a water jacket side surface 21 and a water jacket vertical surface 23, wherein the water jacket top plate 22 and the water jacket bottom plate 27 are arranged in parallel and are respectively positioned above and below the pipeline 1. The water jacket vertical surface 23 is positioned on the inner side and the outer side of the water jacket top plate 22 and the water jacket bottom plate 27 and is vertical to the horizontal plane; the water jacket side surface 21 is positioned at the upstream and downstream of the water jacket assembly 2 and is fixedly connected with the water jacket top plate 22, the water jacket bottom plate 27 and the water jacket vertical surface 23 respectively. In the present invention, in order to avoid water overflow between adjacent water jackets, the water jacket side surfaces 21 may be disposed higher than the water jacket vertical surfaces 23 on both the inner and outer sides.
In the invention, the joint part of the pipeline 1 and the water jacket assembly 2 and the components in the water jacket assembly 2 are fixed by adopting chloroform, and polyurethane glue is used for further sealing. The water jacket vertical surfaces 23 in the water jacket assembly 2 can be reinforced by using organic glass hot bending forming reinforcing sheets, and the connection positions of the water jacket vertical surfaces 23 and the water jacket bottom plate 27 are reinforced by using organic glass reinforcing strips.
In the invention, the water jacket top plate 22 in the water jacket assembly 2 is four independent trapezoidal organic glass plates. The water jacket top plate 22 is provided with a buckle formed by an elongated organic glass strip at the edge of the bottom, so that the water jacket top plate 22 can be buckled with the components at the bottom. As can be seen from the description of the preceding paragraphs, the water jacket assembly 2 comprises four separate water jackets, and after the water jackets are filled with water, it is ensured that the bottom surface of the water jacket top plate 22 is in full contact with the upper surface of the body of water in the water jackets, so that the entire separate water jacket space is fully filled with water. At this point, LDV techniques can be used to measure the flow rate of water within the elbow end 12 from the water jacket vertical surface 23, the water jacket top plate 22, the water jacket bottom plate 27 in the four-stage water jacket. When the PIV technology is adopted for measurement, since the water jacket top plate 22 and the water jacket bottom plate 27 are respectively perpendicular to the water jacket vertical surface 23, any one group of parallel surfaces in each section of independent water jacket can be used as the ingestion surface of the slice laser, and the other group of mutually parallel surfaces can be used as the image acquisition surface of the CCD camera.
As can be seen from the above paragraphs, since the four sections of the independent water jackets forming the water jacket assembly 2 are all required to be filled with water, the water jacket vertical surface 23 may deform under the pressure of the water in the independent water jackets to cause refractive errors, and the connecting piece 24 is required to be arranged at the connecting position of the water jacket vertical surface 23 and the water jacket top plate 22 for fixing. Specifically, the engaging pieces 24 of the present invention include an upper engaging piece on the water jacket top plate 22, and a lower engaging piece on the upper edge of the water jacket vertical surface 23, respectively, and the upper engaging piece and the lower engaging piece are connected by a bolt assembly 25 after being aligned. The above structure can ensure the level of the water jacket top plate 22 and prevent water flow in the independent water jacket from overflowing, in addition to avoiding deformation of the water jacket vertical surface 23.
In the invention, the damping device 3 can be selected to be hard rubber with a cuboid structure, and the damping device 3 can be selectively arranged on the bottom bevel edge of each independent water jacket to play a role in stabilizing the water jacket assembly 2. Meanwhile, the damping device 3 can absorb system vibration caused by moving water flow in the bent pipe section 2, so that a stable flow velocity measurement environment is provided for experiments.
Finally, although the description has been described in terms of embodiments, not every embodiment is intended to include only a single embodiment, and such description is for clarity only, as one skilled in the art will recognize that the embodiments of the disclosure may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (6)
1. An LDV and PIV technology compatible flat return bend pipeline water flow velocity measurement device, its characterized in that: the water jacket assembly (2) is of a multi-section independent cover body structure which is made of transparent materials and distributed along the pipeline (1); each section of independent cover structure at least comprises two groups of planes which are parallel to each other and is filled with water; the damping device (3) is positioned at the bottom of the water jacket assembly (2) and is contacted with the horizontal plane; the water jacket assembly (2) comprises a water jacket top plate (22) and a water jacket bottom plate (27) which are arranged in parallel, wherein water jacket vertical surfaces (23) are respectively fixed on the inner side and the outer side of the water jacket top plate (22) and the water jacket bottom plate (27), two ends of the water jacket top plate (22) and the water jacket bottom plate (27) are respectively fixedly connected with the pipeline (1) through water jacket side surfaces (21), and the water jacket side surfaces (21) are respectively fixed with the water jacket top plate (22), the water jacket bottom plate (27) and the end parts of the water jacket vertical surfaces (23); the water jacket top plate (22) is connected with the water jacket vertical surface (23) through a buckle at the bottom edge of the water jacket top plate (22), and the buckle of the water jacket top plate (22) is composed of two strip-shaped bulges which are arranged in parallel; the water jacket top plate (22) is connected with the adjacent water jacket vertical surfaces (23) through connecting pieces (24), the connecting pieces (24) are respectively positioned on the water jacket top plate (22) and the water jacket vertical surfaces (23), and the aligned connecting pieces (24) are fixed through bolt assemblies (25); the adjacent water jacket vertical surfaces (23) are fixed through reinforcing sheets (26), and the reinforcing sheets (26) are plate bodies with bending structures.
2. The flat-loop circuit water flow rate measurement device compatible with LDV and PIV technology according to claim 1, wherein: the pipeline (1) comprises a horizontal straight pipe section (11) and a bent pipe section (12), wherein the horizontal straight pipe section (11) is positioned at two ends of the bent pipe section (12).
3. The flat-loop circuit water flow rate measurement device compatible with LDV and PIV technology according to claim 2, wherein: the bent pipe section (12) is a 180-degree bent pipe.
4. A flat-loop conduit flow rate measurement device compatible with LDV and PIV technology according to any of claims 1 to 3, wherein: the pipeline (1) is an organic glass pipe; the water jacket assembly (2) is made of a plexiglass plate.
5. The flat-loop circuit water flow rate measurement device compatible with LDV and PIV technology according to claim 1, wherein: and the connection position of the water jacket vertical surface (23) and the water jacket bottom plate (27) is reinforced by using organic glass reinforcing strips.
6. The flat-loop circuit water flow rate measurement device compatible with LDV and PIV technology according to claim 1, wherein: the water jacket top plate (22) is trapezoidal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110777463.9A CN113655237B (en) | 2021-07-09 | 2021-07-09 | Flat-loop pipeline water flow velocity measuring device compatible with LDV and PIV technologies |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110777463.9A CN113655237B (en) | 2021-07-09 | 2021-07-09 | Flat-loop pipeline water flow velocity measuring device compatible with LDV and PIV technologies |
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| CN113655237A CN113655237A (en) | 2021-11-16 |
| CN113655237B true CN113655237B (en) | 2024-04-30 |
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