阅读说明：本技术 一种兼容ldv及piv技术的平弯管路水流流速测量装置 (Flat-bend pipeline water flow velocity measuring device compatible with LDV (laser direct current) and PIV (particle image velocimetry) technologies ) 是由 李永业 鲁一凡 李飞 杨小妮 张雪兰 孙西欢 周义仁 马娟娟 宋晓腾 庞雅琦 姚 于 2021-07-09 设计创作，主要内容包括：本发明公开了一种兼容LDV及PIV技术的平弯管路水流流速测量装置,属于复杂管路流速测量装置,用于流速测量,其包括包括管道、水套组件、缓震装置,其中所述的管道由透明材质制成且位于水套组件内,水套组件为由透明材质制成的且沿管道分布的多段独立罩体结构；每段独立罩体结构中至少包括两组相互平行的平面且在独立罩体结构中充满水体；所述缓震装置位于水套组件的底部且与水平面接触。鉴于上述技术方案,本发明能够消除使用LDV或PIV对透明弯管内流场进行流速测量时由于弯管路外壁折射问题造成的测量困难,以及由于管内水流运动造成的实验系统震动等问题,实现了对复杂水平管路内水流流速的无接触测量。(The invention discloses a flat bend 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 the flow velocity, and the device comprises a pipeline, a water jacket component and a cushioning device, wherein the pipeline is made of transparent materials and is positioned in the water jacket component, and the water jacket component 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 body structure at least comprises two groups of planes which are parallel to each other, and water bodies are filled in the independent cover body structure; the shock absorption device is located 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 measurement difficulty caused by the refraction problem of the outer wall of the bent pipeline and vibration of an experimental system caused by the movement of water flow in the pipeline when the flow velocity of the flow field in the transparent bent pipe is measured by using the LDV or the PIV, and realizes the non-contact measurement of the flow velocity of the water flow in the complex horizontal pipeline.)

1. The utility model provides a flat return bend way rivers velocity of flow measuring device of compatible LDV and PIV technique which characterized in that: the shock absorber comprises a pipeline (1), a water jacket assembly (2) and a shock absorber (3), wherein the pipeline (1) is made of transparent materials and is positioned in the water jacket assembly (2), and 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 body structure at least comprises two groups of planes which are parallel to each other, and water bodies are filled in the independent cover body structure; the shock absorption device (3) is located at the bottom of the water jacket assembly (2) and is in contact with the horizontal plane.

2. The device according to claim 1 for measuring flow velocity of water in a flat bend pipeline compatible with LDV and PIV technologies, 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 device according to claim 2 for measuring flow velocity of water in a flat bend pipeline compatible with LDV and PIV technologies, wherein: the bent pipe section (12) is a 180-degree bent pipe.

4. The device according to claim 1 for measuring flow velocity of water in a flat bend pipeline compatible with LDV and PIV technologies, wherein: the water jacket assembly (2) comprises a water jacket top plate (22) and a water jacket bottom plate (27) which are arranged in parallel, 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 two ends of 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 portions of the water jacket top plate (22), the water jacket bottom plate (27) and the water jacket vertical surfaces (23).

5. The LDV and PIV technology compatible flat bend pipeline water flow velocity measurement device of claim 4, wherein: the water jacket top plate (22) is connected with the water jacket vertical plane (23) through a buckle at the edge of the bottom 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.

6. The LDV and PIV technology compatible flat bend pipeline water flow velocity measurement device of claim 4, wherein: the water jacket top plate (22) is connected with the adjacent water jacket vertical surface (23) through a connecting piece (24), the connecting pieces (24) are respectively positioned on the water jacket top plate (22) and the water jacket vertical surface (23), and the aligned connecting pieces (24) are fixed through a bolt assembly (25).

7. The LDV and PIV technology compatible flat bend pipeline water flow velocity measurement device of claim 4, wherein: the vertical surfaces (23) of the adjacent water jackets are fixed by reinforcing plates (26), and the reinforcing plates (26) are plate bodies with bending structures.

8. The device according to any of claims 1-7 for measuring flow velocity of water in a flat bend pipeline compatible with LDV and PIV technologies, comprising: the pipeline (1) is an organic glass pipe; the water jacket component (2) is made of a plexiglass plate.

9. The device according to any of claims 4 to 7 for measuring flow velocity of water in a flat bend pipeline compatible with LDV and PIV technologies, comprising: the connecting position of the water jacket vertical surface (23) and the water jacket bottom plate (27) is reinforced by an organic glass reinforcing strip.

10. The device according to any of claims 4 to 7 for measuring flow velocity of water in a flat bend pipeline compatible with LDV and PIV technologies, comprising: the water jacket top plate (22) is trapezoidal.

Technical Field

The application belongs to a flow velocity measuring device for a complex pipeline, and particularly relates to a flow velocity measuring device for a flat-bend pipeline compatible with LDV and PIV technologies.

Background

In the field of fluid mechanics, flow rate is the most fundamental and important physical quantity for studying the flow characteristics of a fluid. The commonly used flow velocity measurement methods in the field of research on incompressible fluid mechanics at present mainly include pitot tube velocity measurement, LDV velocity measurement and PIV velocity measurement. Although the pitot tube speed measurement has the advantages of simple structure, convenience in use and manufacture, low cost and the like, the probe needs to be placed in a flow field in the measurement process, disturbance can be generated on the flow field, and the pitot tube speed measurement can only be used for calculating the average flow velocity of water flow and cannot meet the requirements of high precision and transient measurement on the point flow velocity in scientific research experiments.

Compared with pitot tube velocity measurement, LDV velocity measurement and PIV velocity measurement are relatively widely used fluid flow velocity measurement methods in the field of fluid mechanics, and both methods are that tracer particles are added into fluid, the movement velocity of the tracer particles along with the fluid in the fluid is measured, and when the following performance of the tracer particles in the fluid is good, the velocity of the tracer particles can be regarded as the flow velocity of the fluid.

However, the LDV velocity measurement and the PIV velocity measurement are still distinctive. Specifically, the LDV velocity measurement is to calculate the three-dimensional velocity of a trace particle by using the doppler shift of scattered light formed on the trace particle by laser when the trace particle moves in a fluid, and further obtain the three-dimensional velocity at a specific spatial point in a flow field. The PIV velocity measurement is to record the trace particle images in two or more instantaneous plane areas by adopting a CCD image sensor, obtain the displacement of the trace particles in a specific time interval by correlation or cross-correlation calculation in a computer and further obtain the three-dimensional velocity of the trace particles in the whole plane area.

In the measurement process of both LDV and PIV speed measurement, it is required to ensure that the laser incidence does not generate measurement errors due to laser refraction, which requires that the laser incidence surface is kept flat and perpendicular to the plane of the incident optical fiber. Meanwhile, in the measurement process, the measurement error possibly caused by pipeline vibration caused by the movement of water flow in the pipeline should be reduced as much as possible, and if a water-containing bent pipe section is involved, because the bent pipe structure is a ring body, the refraction of the pipe wall is more complicated, so that the measurement of the flow velocity of the water flow in the complicated horizontal pipeline by adopting the LDV and PIV technologies becomes more difficult.

Disclosure of Invention

An object of this application is to provide a flat return bend way rivers velocity of flow measuring device of compatible LDV and PIV technique, and it can eliminate and use LDV or PIV to carry out the measurement difficulty that the velocity of flow measured time owing to the outer wall refraction problem of curved line when the flow field carries out the velocity of flow to transparent return bend to and because the experimental system vibrations scheduling problem that intraductal rivers motion caused, realized the contactless measurement to the interior rivers velocity of flow of complicated horizontal pipeline.

In order to achieve the purpose, the method is realized by the following technical scheme:

the device for measuring the water flow velocity of the flat bent pipeline compatible with the LDV and PIV technologies comprises a pipeline, a water jacket assembly and a shock absorption 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 is distributed along the pipeline; each section of independent cover body structure at least comprises two groups of planes which are parallel to each other, and water bodies are filled in the independent cover body structure; the shock absorption device is located at the bottom of the water jacket assembly and is in contact with the horizontal plane.

Further, the pipeline of the present invention comprises a horizontal straight pipe section and a bent pipe section, wherein the horizontal straight pipe section is located at two ends of the bent pipe section.

Further, the bent pipe section is a 180-degree bent pipe.

Further, the water jacket assembly comprises a water jacket top plate and a water jacket bottom plate which are arranged in parallel, the water jacket top plate and the water jacket bottom plate are both 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 two ends of the water jacket bottom plate are respectively fixedly connected with the 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 end portions of the water jacket vertical surfaces.

Furthermore, the water jacket top plate and the water jacket vertical plane are connected through a buckle at the edge of the bottom 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 surface are connected through the connecting pieces, the connecting pieces are respectively positioned on the water jacket top plate and the water jacket vertical surface, and the aligned connecting pieces are fixed through the bolt assemblies.

Furthermore, the vertical surfaces of the adjacent water jackets are fixed by the reinforcing sheet, and the reinforcing sheet is a plate body with a bending structure.

Further, the pipeline is an organic glass pipe; the water jacket assembly is made of an organic glass plate.

Furthermore, the connecting position of the water jacket vertical surface and the water jacket bottom plate is reinforced by an organic glass reinforcing strip.

Further, the water jacket top plate is trapezoidal.

Compared with the prior art, the beneficial effects of this application are:

1. when the device is used, the measurement difficulty caused by the refraction problem of the outer wall of the bent pipeline when the flow velocity of the flow field in the transparent bent pipe is measured by LDV speed measurement or PIV speed measurement can be effectively eliminated.

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 measurement methods for speed measurement.

3. According to the invention, the structural forms including the reinforcing plate, the connecting plate and the like are arranged in the water jacket assembly, so that the deformation of the organic glass side wall of the water jacket under the water pressure action of the water jacket is effectively prevented.

4. By arranging the cushioning device, the invention can effectively inhibit the vibration of the experimental system caused by the flow of water flow in the experimental process, and is beneficial to improving the accuracy of the experimental result.

Drawings

Fig. 1 is a first schematic structural diagram of the present invention.

FIG. 2 is a second schematic structural diagram of the present invention.

In the figure: 1. a pipeline; 2. a water jacket assembly; 3. a cushioning device.

11. A horizontal straight tube section; 12. bending the pipe section; 21. a water jacket side; 22. a water jacket top plate; 23. a water jacket vertical plane; 24. a tab; 25. a bolt assembly; 26. a reinforcing sheet; 27. the water jacket bottom plate.

Detailed Description

The technical solutions described in the present application are further described below with reference to the accompanying drawings and embodiments. It should be noted that, in the following paragraphs, possible directional terms including, but not limited to, "upper, lower, left, right, front, rear" and the like are used, and all directions are meant to correspond to the visual directions shown in the drawings of the specification, which should not be construed as limiting the scope of the present invention, and are only for facilitating the better understanding of the technical solutions described in the specification by those skilled in the art.

In the description of the following paragraphs, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected 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 according to the specific circumstances in combination with common general knowledge in the art, design specifications, standard documents, and the like.

Example 1

A flat bent pipeline water flow velocity measuring device compatible with LDV and PIV technologies comprises a pipeline 1, a water jacket component 2 and a shock absorption device 3, wherein the pipeline 1 is made of transparent materials and is positioned in the water jacket component 2, and the water jacket component 2 is of a multi-section independent cover body structure which is made of transparent materials and is distributed along the pipeline 1; each section of independent cover body structure at least comprises two groups of planes which are parallel to each other, and water bodies are filled in the independent cover body structure; the shock absorber 3 is located at the bottom of the water jacket assembly 2 and contacts with the horizontal plane.

Example 2

A flow velocity measuring device of water flow of a flat bend pipeline compatible with LDV and PIV technologies is disclosed, wherein the pipeline 1 comprises a horizontal straight pipe section 11 and a bend pipe section 12, and the horizontal straight pipe section 11 is positioned at two ends of the bend 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, 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 edge of the bottom of the water jacket top plate 22, and the buckle of the water jacket top plate 22 is formed by two strip-shaped bulges which are arranged in parallel; the water jacket top plate 22 is connected with the adjacent water jacket vertical surface 23 through a connecting piece 24, the connecting piece 24 is respectively positioned on the water jacket top plate 22 and the water jacket vertical surface 23, and the aligned connecting pieces 24 are fixed through a bolt assembly 25; the adjacent water jacket vertical surfaces 23 are fixed through reinforcing plates 26, and the reinforcing plates 26 are plate bodies with bending structures; the pipeline 1 is an organic glass pipe; the water jacket component 2 is made of organic glass plates; the connecting position of the water jacket vertical surface 23 and the water jacket bottom plate 27 is reinforced by an organic glass reinforcing strip; the water jacket top plate 22 is trapezoidal. The structure and connection relationship of the rest parts are the same as those described in any of the foregoing embodiments, and are not described herein again to avoid the tedious text.

On the basis of the above-mentioned embodiments, the following paragraphs are used to continue detailed description of the technical features involved therein and the functions and actions of the technical features in the technical solutions, so as to help those skilled in the art fully understand the technical solutions and reproduce the technical solutions.

As shown in fig. 1 to 2, the device for measuring flow velocity of water flow in a flat bend pipeline compatible with LDV and PIV technologies according to the present invention includes a pipeline 1, wherein the pipeline 1 is composed of a horizontal straight pipe section 11 and a bend pipe section 12, and the horizontal straight pipe section 11 is located at the upstream and downstream of the bend pipe section 12 and is integrated with the bend pipe section 12. The pipeline 1 is made of organic glass, and the bent pipe section 12 is a 180-degree bent pipe.

In the invention, the water jacket assembly 2 is composed of four sections distributed along the pipeline 1, the four sections of water jacket assemblies 2 can completely wrap the elbow section 12 of the pipeline 1, and each section of water jacket assembly 2 is connected with each other through the water jacket side surface 21. Each section of the 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 plane 23 is positioned at 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 surfaces 21 are located at the upstream and downstream of the water jacket assembly 2 and are 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 prevent the water body between the adjacent water jackets from overflowing, the water jacket side surfaces 21 may be set higher than the water jacket vertical surfaces 23 on the inner and outer sides.

In the invention, the joint part of the pipeline 1 and the water jacket component 2 and all the components in the water jacket component 2 are fixed by trichloromethane, and polyurethane glue is used for further sealing. Organic glass hot-bending forming reinforcing sheets can be used for reinforcing between the water jacket vertical surfaces 23 in the water jacket assembly 2, and organic glass reinforcing strips are adopted for reinforcing at the connecting positions of the water jacket vertical surfaces 23 and the water jacket bottom plate 27.

In the invention, the water jacket top plate 22 in the water jacket component 2 is four independent trapezoidal organic glass plates. The buckle that rectangular form organic glass strip formed is installed to water jacket roof 22 in bottom border position department for carry out the lock joint between the subassembly of water jacket roof 22 and bottom. As will be understood from the description in the above paragraphs, the water jacket assembly 2 includes four independent water jackets, and when the water jackets are filled with water, the bottom surface of the water jacket top plate 22 is ensured to be in complete contact with the upper surface of the water body in the water jackets, so that the entire independent water jacket space is completely filled with water. At this time, the flow velocity of the water flow in the elbow end 12 can be measured from the water jacket vertical surface 23, the water jacket top plate 22, and the water jacket bottom plate 27 in the four-stage water jacket using the LDV technique. When the PIV technology is adopted for measurement, because the water jacket top plate 22 and the water jacket bottom plate 27 are respectively vertical to the water jacket vertical plane 23, any one group of parallel planes in each section of independent water jacket can be used as an intake plane of the sheet laser, and the other group of parallel planes are used as an image acquisition plane of the CCD camera.

As can be seen from the above paragraphs, since the four independent water jackets constituting the water jacket assembly 2 are all required to be filled with water, the water jacket vertical surface 23 may be deformed under the pressure of the water in the independent water jackets to cause refraction errors, and the connection position between the water jacket vertical surface 23 and the water jacket top plate 22 needs to be provided with the connection piece 24 for fixing. Specifically, the engaging pieces 24 according to the present invention respectively include an upper engaging piece located on the top plate 22 of the water jacket and a lower engaging piece located on the upper edge of the vertical surface 23 of the water jacket, and the upper engaging piece and the lower engaging piece are aligned and connected by a bolt assembly 25. The above structure can avoid the deformation of the water jacket vertical surface 23, and can ensure the level of the water jacket top plate 22 and prevent the overflow of the water flow in the independent water jacket.

In the invention, the shock absorber 3 can be selected from hard rubber with a cuboid structure, and the shock absorber 3 can be selected to be arranged on the bottom bevel edge of each independent water jacket so as to play a role in stabilizing the water jacket assembly 2. Meanwhile, the shock absorption device 3 can absorb system shock caused by moving water flow in the elbow section 2, so that a stable flow velocity measurement environment is provided for an experiment.

Finally, although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description of the present description is for clarity reasons only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can be appropriately combined to form other embodiments that can be understood by those skilled in the art.