Flow-induced instability measuring system for plate-shaped structure

Abstract

The invention relates to the technical field of reactor plate-shaped structure deformation experiment measurement, in particular to a plate-shaped structure flow-induced instability measurement system which comprises a supporting frame, a supporting structure, a simulation unit and a monitoring subsystem. The supporting structure is made of a transparent material, and a through hollow area is formed; the simulation unit is characterized in that a plurality of plate-shaped simulation pieces are inserted into the hollow area, and flow channels are formed between every two adjacent plate-shaped simulation pieces and between the plate-shaped simulation pieces and the inner wall of the supporting structure; the monitoring subsystem can monitor the surface feature information of the plate-shaped simulation piece, and the deformation morphology of the plate-shaped simulation piece under fluid scouring is obtained. According to the flow-induced instability measurement system for the plate-shaped structure, a non-contact measurement mode is adopted, the monitoring subsystem is arranged on the outer side of the plate-shaped simulation piece, the space of a flow channel is not occupied, full-field measurement can be achieved, and the flow-induced instability measurement system has the advantages of being high in anti-interference capacity, high in measurement precision and the like; in addition, the measurement requirements of fuel plates of various shapes and sizes can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental measurement of the deformation of the plate - like structure of a reactor, and particularly to a measurement system for flow - induced instability of a plate - like structure. Background Art

[0002] Compared with traditional rod - shaped fuel assemblies, plate - shaped fuel elements have better economy and safety due to advantages such as large heat transfer area, high output power, high structural stiffness, and good stability, and are widely used in research reactors. Plate - shaped fuel elements generally use rectangular or arc - shaped fuel plates with a large width - to - thickness ratio. The ratio of the width to the thickness of the fuel plate is about 20 - 50. During the operation of the reactor, the fuel plates are separated by narrow flow channels, and the coolant flows through the surface of the fuel plates to take away the heat generated by nuclear fission. In this process, the fuel plate and the coolant form a typical fluid - solid coupling structure. The rapid axial flow of the coolant will cause the vibration of the fuel assembly, namely flow - induced vibration. Specifically, when the coolant flow rate is low, the fuel plate will absorb energy from the coolant fluid motion, causing the vibration of the plate - type assembly and the deflection of the fuel plate; when the coolant flow rate is too high, the balance between the fuel plate structure and the fluid is broken, and structural instability, namely fluid - elastic instability, may occur, which may further trigger uncontrollable non - linear vibration and even cause the collapse of the assembly, leading to safety accidents. Therefore, in order to ensure the safe operation of nuclear reactors, it is necessary to conduct experimental research on the flow - induced instability of reactor fuel elements.

[0003] In previous studies, generally, displacement or strain sensing units were used to measure the displacement or deformation of single or multiple measuring points on the fuel plate to obtain the local deformation of the fuel plate. Specifically, for example, a displacement sensor was used to measure the out - of - plane displacement of a single measuring point on the fuel plate, and a strain gauge or strain rosette was used to measure the strain of a single measuring point on the fuel plate. The deformation profile of the fuel plate was obtained by fitting the data of multiple measuring points. However, the difficulties brought by more measuring points are that the sensing elements occupy the narrow flow channel space and the experimental data processing is complex. Summary of the Invention

[0004] The present invention provides a measurement system for flow - induced instability of a plate - like structure to solve the defects in the prior art that the sensing elements occupy the narrow flow channel space and the experimental data processing is complex.

[0005] The present invention provides a measurement system for flow - induced instability of a plate - like structure, including: A support frame; A support structure, provided on the support frame, made of a transparent material, and formed with a through - hole hollow region; A simulation unit, including: a plurality of plate - like simulation pieces, the plurality of plate - like simulation pieces are inserted into the hollow region, and flow channels are formed between adjacent two of the plate - like simulation pieces and between the plate - like simulation pieces and the inner wall of the support structure; The monitoring subsystem is used to monitor the surface feature information of the plate-like simulation component through the support structure, so as to obtain the deformation morphology of the plate-like simulation component under fluid scouring.

[0006] According to the plate-like structure fluid-induced instability measurement system provided by the present invention, the cross-sectional shapes of the hollow region and the plate-like simulation component are both arc-shaped; and the cross-sectional shapes of the flow channels formed between two adjacent plate-like simulation components and between the plate-like simulation component and the inner wall of the support structure are both arc-shaped.

[0007] According to the plate-like structure fluid-induced instability measurement system provided by the present invention, the cross-sectional shapes of the hollow region and the plate-like simulation component are both rectangular; and the cross-sectional shapes of the flow channels formed between two adjacent plate-like simulation components and between the plate-like simulation component and the inner wall of the support structure are both rectangular.

[0008] According to the plate-like structure fluid-induced instability measurement system provided by the present invention, the support structure includes: a first hollow support plate, a second hollow support plate, and a third hollow support plate connected in sequence from top to bottom, and an installation groove is formed in the hollow region of the second hollow support plate; The simulation unit further includes: a limit connecting member, which is arranged at both ends along the width direction of the plate-like simulation component and connects the plate-like simulation components. The limit connecting member is adapted to be inserted into the installation groove and limit the plate-like simulation component in the hollow region of the second hollow support plate.

[0009] According to the plate-like structure fluid-induced instability measurement system provided by the present invention, the support structure further includes: A first flange skirt, fixed to the bottom of the first hollow support plate; A second flange skirt, fixed to the top of the second hollow support plate and connected to the first flange skirt; A third flange skirt, fixed to the bottom of the second hollow support plate; A fourth flange skirt, fixed to the top of the third hollow support plate and connected to the third flange skirt.

[0010] According to the plate-like structure fluid-induced instability measurement system provided by the present invention, the support structure further includes: a first gasket and a second gasket; Wherein, the second flange skirt and the first flange skirt are tightly connected through the first gasket and fasteners, and the fourth flange skirt and the third flange skirt are tightly connected through the second gasket and fasteners.

[0011] According to the plate-like structure fluid-induced instability measurement system provided by the present invention, the support structure further includes: The lug ears are fixed on both sides of the second hollow support plate and are connected to the support frame; The fifth flange skirt support is fixed at the bottom of the third hollow support plate and is connected to the support frame.

[0012] According to the plate - like structure fluid - induced instability measurement system provided by the present invention, the support frame includes: a first vertical column, a second vertical column, a third vertical column, a fourth vertical column, a first horizontal stiffening rib, a second horizontal stiffening rib, a third horizontal stiffening rib, a fourth horizontal stiffening rib, a fifth horizontal stiffening rib, and a sixth horizontal stiffening rib; Wherein, the first horizontal stiffening rib and the second horizontal stiffening rib are respectively connected between the first vertical column and the second vertical column, the third horizontal stiffening rib and the fourth horizontal stiffening rib are respectively connected between the third vertical column and the fourth vertical column, and the fifth horizontal stiffening rib and the sixth horizontal stiffening rib are respectively connected between the second horizontal stiffening rib and the third vertical column; The lug ears are respectively and tightly connected to the first horizontal stiffening rib and the third horizontal stiffening rib through fasteners; The fifth flange skirt support is respectively and tightly connected to the second horizontal stiffening rib and the fourth horizontal stiffening rib through fasteners.

[0013] According to the plate - like structure fluid - induced instability measurement system provided by the present invention, the monitoring subsystem includes: A white - light light source for passing through the support structure and irradiating the plate - like simulation part; An image acquisition device for acquiring the surface feature information of the plate - like simulation part before and after deformation; A processor for obtaining the deformation morphology of the plate - like simulation part under fluid erosion according to the surface feature information acquired by the image acquisition device.

[0014] According to the plate - like structure fluid - induced instability measurement system provided by the present invention, markers are provided on the outer surface of the plate - like simulation part as the marked points acquired by the image acquisition device.

[0015] A plate - like structure fluid - induced instability measurement system provided by the present invention includes: a support frame, a support structure, a simulation unit, and a monitoring subsystem. The support structure is arranged on the support frame, made of a transparent material, and formed with a through - hollow area; the simulation unit includes: a plurality of plate - like simulation pieces, the plurality of plate - like simulation pieces are inserted into the hollow area, and flow channels are formed between adjacent two plate - like simulation pieces and between the plate - like simulation pieces and the inner wall of the support structure; the monitoring subsystem is used to monitor the surface feature information of the plate - like simulation pieces through the support structure, so as to obtain the deformation morphology of the plate - like simulation pieces under fluid erosion. The plate - like structure fluid - induced instability measurement system provided by the present invention installs the plate - like simulation pieces through a transparent support structure, and uses the monitoring subsystem to monitor its surface feature information, so as to obtain its deformation morphology under fluid erosion. It adopts a non - contact measurement method. The monitoring subsystem is arranged outside, does not occupy the flow channel space, and can realize full - field measurement, having advantages such as strong anti - interference ability and high measurement accuracy; in addition, it can meet the measurement requirements of fuel plates with various shapes and sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following - described drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the plate - like structure fluid - induced instability measurement system provided in one embodiment of the present invention.

[0018] Figure 2 It is a front view of the plate - like structure fluid - induced instability measurement system provided in one embodiment of the present invention.

[0019] Figure 3 It is a top view of the plate - like structure fluid - induced instability measurement system provided in one embodiment of the present invention.

[0020] Figure 4 It is a top view after the assembly of the second hollow support plate and the plate - like simulation pieces provided in one embodiment of the present invention.

[0021] Figure 5 It is a schematic structural diagram of the plate - like simulation pieces and the limit connecting pieces provided in one embodiment of the present invention.

[0022] Figure 6 It is a schematic structural diagram of the second hollow support plate provided in one embodiment of the present invention.

[0023] Figure 7It is a schematic structural diagram of a support frame provided in one embodiment of the present invention.

[0024] Reference numerals: 101: First hollow support plate; 102: Second hollow support plate; 1021: Installation groove; 103: Third hollow support plate; 104: First flange skirt; 105: Second flange skirt; 106: Third flange skirt; 107: Fourth flange skirt; 108: First gasket; 109: Second gasket; 110: Support ear; 111: Fifth flange skirt; 201: First vertical column; 202: Second vertical column; 203: Third vertical column; 204: Fourth vertical column; 205: First horizontal stiffening rib; 206: Second horizontal stiffening rib; 207: Third horizontal stiffening rib; 208: Fourth horizontal stiffening rib; 209: Fifth horizontal stiffening rib; 210: Sixth horizontal stiffening rib; 301: Plate-like simulation piece; 302: Flow channel; 303: Limit connecting piece; 401: White light source; 402: Image acquisition device; 403: Processor. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0026] In the description of this embodiment, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this embodiment.

[0027] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this embodiment, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0028] In this embodiment, unless otherwise clearly specified and defined, terms such as "arranged", "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0029] In the embodiments of the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0030] The following Figures 1-7 describes a plate - like structure fluid - induced instability measurement system of the present invention. The plate - like structure fluid - induced instability measurement system includes: a support frame, a support structure, a simulation unit, and a monitoring subsystem.

[0031] The support structure is arranged on the support frame. The support structure is made of a transparent material and has a through - hollow area formed therein; the simulation unit includes: a plurality of plate - like simulation members 301. The plurality of plate - like simulation members 301 are inserted into the hollow area, and flow channels 302 are formed between adjacent two plate - like simulation members 301 and between the plate - like simulation members 301 and the inner wall of the support structure; the monitoring subsystem is used to monitor the surface feature information of the plate - like simulation members 301 through the support structure, so as to obtain the deformation morphology of the plate - like simulation members 301 under fluid erosion.

[0032] Specifically, the support frame serves as the support and installation structure of the entire system, and is used to fixedly install the support structure and maintain the stability of the support structure and the internal simulation unit.

[0033] Specifically, the support structure is made of a transparent material, such as: plexiglass, etc.; the support structure is formed with a through hollow area for installing the plate-shaped simulation part 301 and ensuring the formation of the flow channel 302. After the experiment starts, the coolant can pass through this through hollow area. It should be understood that this hollow area can be processed according to the experimental conditions and the shape of the plate-shaped simulation part 301. This hollow area is through along the height direction of the support structure, and its cross-sectional shape is generally an arc or a rectangular structure, mainly designed according to the shape of the plate-shaped simulation part 301.

[0034] The simulation unit is composed of multiple plate-shaped simulation parts 301, generally at least two are set. In the following embodiments, taking the installation of two plate-shaped simulation parts 301 as an example for illustration, the two plate-shaped simulation parts 301 are installed in the hollow area of the support structure, and a gap is ensured between the two plate-shaped simulation parts 301. A gap is also formed between the plate-shaped simulation part 301 and the inner wall of the support structure. That is to say, three gaps are formed through the above structure. This gap serves as the flow channel 302 for the coolant to pass through. After the experiment starts, the coolant passes through this flow channel 302 to simulate the influence of the coolant flow on the structure of the plate-shaped simulation part 301.

[0035] Furthermore, the plate-shaped simulation part 301 is generally an aluminum alloy or a sandwich structure of aluminum alloy - simulation core - aluminum alloy.

[0036] Since the monitoring subsystem can detect the plate-shaped simulation part 301 through the transparent support structure, it is not limited to being installed in the flow channel 302 in the prior art. It can be installed on the outside of the support structure, and according to the monitoring needs, multiple monitoring subsystems can be arranged. The requirements for the experimental environment are extremely loose, so it is not limited to the single-point monitoring in the prior art, but can achieve full-field measurement, with advantages such as strong anti-interference ability and high measurement accuracy. The present invention can effectively solve the technical problems of large full-field monitoring area, small displacement amplitude, and high vibration frequency existing in the plate-shaped structure during the experiment of flow-induced instability of simulated fuel elements.

[0037] In addition, according to the monitoring needs, the support structure and the plate-shaped simulation part 301 with different-shaped hollow areas can be correspondingly manufactured, which can simulate the arc plate shapes with various curvature radii and are not limited by the arc plate material, or can also simulate rectangular fuel plates.

[0038] A plate - like structure fluid - induced instability measurement system provided by the present invention includes: a support frame, a support structure, a simulation unit, and a monitoring subsystem. The support structure is arranged on the support frame, is made of a transparent material, and has a through - hollow area formed therein; the simulation unit includes: a plurality of plate - like simulation members 301, the plurality of plate - like simulation members 301 are inserted into the hollow area, and flow channels 302 are formed between two adjacent plate - like simulation members 301 and between the plate - like simulation members 301 and the inner wall of the support structure; the monitoring subsystem is used to monitor the surface feature information of the plate - like simulation members 301 through the support structure, so as to obtain the deformation morphology of the plate - like simulation members 301 under fluid scouring. The plate - like structure fluid - induced instability measurement system provided by the present invention installs the plate - like simulation members 301 through a transparent support structure, and uses the monitoring subsystem to monitor the surface feature information thereof, so as to obtain the deformation morphology under fluid scouring. It adopts a non - contact measurement method. The monitoring subsystem is arranged on the outside, does not occupy the space of the flow channels 302, and can achieve full - field measurement, having the advantages of strong anti - interference ability and high measurement accuracy; in addition, it can meet the measurement requirements of fuel plates of various shapes and sizes.

[0039] In one embodiment of the present invention, the cross - sectional shapes of the hollow area and the plate - like simulation members 301 are both arc - shaped; and the cross - sectional shapes of the flow channels 302 formed between two adjacent plate - like simulation members 301 and between the plate - like simulation members 301 and the inner wall of the support structure are both arc - shaped. Specifically, the hollow area of the support structure and the plate - like simulation members 301 adopt arc - shaped shapes with the same curvature. Therefore, the formed flow channels 302 are also arc - shaped flow channels 302 with the same curvature.

[0040] In one embodiment of the present invention, the cross - sectional shapes of the hollow area and the plate - like simulation members 301 are both rectangular; and the cross - sectional shapes of the flow channels 302 formed between two adjacent plate - like simulation members 301 and between the plate - like simulation members 301 and the inner wall of the support structure are both rectangular. Specifically, the hollow area of the support structure and the plate - like simulation members 301 adopt a rectangular structure. Therefore, the formed flow channels 302 are also rectangular structures, which is a special form of the arc - shaped flow channels 302 in the above - mentioned embodiment, that is, a solution with a curvature of 0.

[0041] In the above two embodiments, by processing the support structure and the plate - like simulation members 301 with hollow areas of specific shapes, fluid - induced instability experiments on fuel plates of specific shapes can be realized, and the application scenarios are wide.

[0042] In one embodiment of the present invention, the support structure includes: a first hollow support plate 101, a second hollow support plate 102, and a third hollow support plate 103, which are connected in sequence from top to bottom. An installation groove 1021 is formed in the hollow area of the second hollow support plate 102. The simulation unit further includes: a limit connecting member 303, which is arranged at both ends along the width direction of the plate-shaped simulation member 301 and connects the plate-shaped simulation members 301. The limit connecting member 303 is adapted to be inserted into the installation groove 1021, and the plate-shaped simulation member 301 is limited within the hollow area of the second hollow support plate 102. The first hollow support plate 101, the second hollow support plate 102, and the third hollow support plate 103 are all hollow plates, forming a hollow area. In this embodiment, the second hollow support plate 102 is located between the first hollow support plate 101 and the third hollow support plate 103, mainly playing the role of limiting and installing the plate-shaped simulation member 301. Specifically: An installation groove 1021 is machined in the hollow area of the second hollow support plate 102. The limit connecting member 303 is located at both ends of the plate-shaped simulation member 301 along the width direction, connecting the two plate-shaped simulation members 301 into one body. The limit connecting member 303 can just be inserted into the installation groove 1021. After assembly, a flow channel 302 is formed between the plate-shaped simulation member 301 and the second hollow support plate 102. Also, because the first hollow support plate 101 and the third hollow support plate 103 do not have the structure of the installation groove 1021, after the plate-shaped simulation member 301 is assembled, the first hollow support plate 101 and the third hollow support plate 103 are respectively installed on the top and bottom of the second hollow support plate 102, so that the plate-shaped simulation member 301 is limited within the hollow area of the second hollow support plate 102 and will not move up and down, ensuring the stable installation of the plate-shaped simulation member 301. If it is necessary to remove the plate-shaped simulation member 301, it is necessary to first remove the first hollow support plate 101 and the third hollow support plate 103, and then take out the plate-shaped simulation member 301 from the second hollow support plate 102.

[0043] Specifically, the installation groove 1021 is located on the left and right sides, and the limit connecting member 303 is also located on the left and right sides of the plate-shaped simulation member 301, ensuring that the limit connecting member 303 can be adaptively inserted into the installation groove 1021 and achieving the effect of limiting and installing the plate-shaped simulation member 301.

[0044] In one embodiment of the present invention, the support structure further includes: a first flange skirt 104, a second flange skirt 105, a third flange skirt 106, and a fourth flange skirt 107. Among them, the first flange skirt 104 is fixed to the bottom of the first hollow support plate 101; the second flange skirt 105 is fixed to the top of the second hollow support plate 102 and is connected to the first flange skirt 104; the third flange skirt 106 is fixed to the bottom of the second hollow support plate 102; the fourth flange skirt 107 is fixed to the top of the third hollow support plate 103 and is connected to the third flange skirt 106. Specifically, the first hollow support plate 101 and the second hollow support plate 102 are fixed through the first flange skirt 104 and the second flange skirt 105, and the second hollow support plate 102 and the third hollow support plate 103 are fixed through the third flange skirt 106 and the fourth flange skirt 107.

[0045] In one embodiment of the present invention, the support structure further includes: a first gasket 108 and a second gasket 109. Among them, the second flange skirt 105 and the first flange skirt 104 are tightly connected through the first gasket 108 and fasteners, and the fourth flange skirt 107 and the third flange skirt 106 are tightly connected through the second gasket 109 and fasteners. The first gasket 108 is located between the second flange skirt 105 and the first flange skirt 104, and the second gasket 109 is located between the fourth flange skirt 107 and the third flange skirt 106. The above gaskets are sealing gaskets made of rubber material, and the sealing effect is achieved after being fastened by fasteners.

[0046] In one embodiment of the present invention, the support structure further includes: lugs 110 and a fifth flange skirt 111. The lugs 110 are fixed to both sides of the second hollow support plate 102 and are connected to the support frame; the fifth flange skirt 111 is fixed to the bottom of the third hollow support plate 103 and is connected to the support frame. In this embodiment, the support structure is connected to the support frame through the lugs 110 and the fifth flange skirt 111, ensuring that the support structure is stably installed on the support frame.

[0047] In one embodiment of the present invention, the support frame includes: a first vertical column 201, a second vertical column 202, a third vertical column 203, a fourth vertical column 204, a first horizontal reinforcing rib 205, a second horizontal reinforcing rib 206, a third horizontal reinforcing rib 207, a fourth horizontal reinforcing rib 208, a fifth horizontal reinforcing rib 209, and a sixth horizontal reinforcing rib 210. Among them, the first horizontal reinforcing rib 205 and the second horizontal reinforcing rib 206 are respectively connected between the first vertical column 201 and the second vertical column 202, the third horizontal reinforcing rib 207 and the fourth horizontal reinforcing rib 208 are respectively connected between the third vertical column 203 and the fourth vertical column 204, and the fifth horizontal reinforcing rib 209 and the sixth horizontal reinforcing rib 210 are respectively connected between the second horizontal reinforcing rib 206 and the third vertical column 203. Specifically, the support frame is composed of four vertical columns and six horizontal reinforcing ribs. The horizontal reinforcing ribs connect the four vertical columns to ensure the overall structural stability of the support frame.

[0048] Furthermore, the lugs 110 are respectively and fixedly connected to the first horizontal reinforcing rib 205 and the third horizontal reinforcing rib 207 through fasteners; the fifth flange skirt 111 is respectively and fixedly connected to the second horizontal reinforcing rib 206 and the fourth horizontal reinforcing rib 208 through fasteners. In this embodiment, the left and right lugs 110 are respectively fixed to the first horizontal reinforcing rib 205 and the third horizontal reinforcing rib 207 through fasteners; the left and right sides of the fifth flange skirt 111 are respectively fixed to the second horizontal reinforcing rib 206 and the fourth horizontal reinforcing rib 208 through fasteners, ensuring the stable installation of the support structure on the support frame.

[0049] It can be understood that the fasteners adopted above can all adopt the fastening method of bolts and nuts.

[0050] In one embodiment of the present invention, the monitoring subsystem includes: a white light source 401, an image acquisition device 402, and a processor 403. The white light source 401 is used to irradiate the plate-like simulation member 301 through the support structure; the image acquisition device 402 is used to acquire the surface feature information of the plate-like simulation member 301 before and after deformation; the processor 403 is used to obtain the deformation morphology of the plate-like simulation member 301 under fluid erosion according to the surface feature information acquired by the image acquisition device 402. The light source uses the white light source 401; during the experiment, the white light source 401 is used for supplementary lighting, and the surface features of the plate-like simulation member 301 before and after deformation are synchronously photographed and recorded by the image acquisition device 402 (which can be a camera) and transmitted to the processor 403 (which can be a computer). The high-precision digital image correlation (Digital Image Correlation, DIC) technology is used to identify the changes in the surface features of the plate-like simulation member 301, and the corresponding coordinate changes of each pixel of the image are obtained through three-dimensional reconstruction and digital image correlation algorithms, and data such as the three-dimensional displacement field and three-dimensional strain field in this process are calculated.

[0051] In one embodiment of the present invention, markers are provided on the outer surface of the plate-like simulation member 301 as the marking points collected by the image acquisition device 402. Specifically, the plate-like simulation member 301 needs to use the template / spraying technology to make surface speckles before the experiment as the marking points for high-precision digital image correlation calculation; if the plate-like simulation member 301 itself already has obvious contrast features of light and dark textures, its natural features can also be used to replace the speckles.

[0052] An assembly and monitoring method for a plate-like structure fluid-induced instability measurement system provided by the present invention is as follows: S1. Pretreatment and installation of the simulation unit. First, the surface of the plate-like simulation member 301 close to the camera needs to be processed with template / sprayed speckles; then, the two plate-like simulation members 301 are embedded into the second hollow support plate 102 from top to bottom, so that the limit connecting member 303 enters the installation groove 1021, and can be further fixed by bonding or limiting, etc., so that both ends of the plate-like simulation member 301 are fixed, and the installation of the simulation unit is completed; S2. Installation of the support structure.

[0053] First, the fourth flange skirt 107 and the third flange skirt 106 are fastened by using the second gasket 109 and bolts, and the second flange skirt 105 and the first flange skirt 104 are fastened by using the first gasket 108 and bolts, and the third hollow support plate 103, the second hollow support plate 102, and the first hollow support plate 101 are assembled into a whole; After that, the fifth flange skirt 111 and the support frame are fastened by bolts; the lugs 110 and the support frame are fastened by bolts; Through the above method, the installation and positioning of the simulation unit are completed; S3. Preparation before the experiment and the experimental process. Before the fluid-induced instability experiment, use the bracket to adjust the field of view range and distance of the camera, use the white light source 401 to adjust the light intensity distribution of the field of view, and use the camera to synchronously take pictures of the plate-shaped simulation part 301 to obtain the three-dimensional surface feature topography before the experiment, which is used as the calculation benchmark for the digital image correlation technology; during the fluid-induced instability experiment, use the camera to synchronously take pictures of the plate-shaped simulation part 301 throughout the process to obtain the three-dimensional surface feature information of each frame, and transmit it to the computer in real time. After being processed by high-precision digital image correlation software, the deformation amplitude of the plate-shaped simulation part 301 under fluid erosion can be obtained in real time, including specific data such as three-dimensional displacement field and three-dimensional strain field.

[0054] In summary, a fluid-induced instability measurement system for a plate-shaped structure provided by the present invention has the following beneficial effects: 1. The present invention can realize the measurement of the three-dimensional deformation field of the fluid-induced instability of the arc-shaped plate-shaped simulation part 301, automatically obtain the three-dimensional topography of the arc-shaped plate-shaped simulation part 301, and output corresponding data such as displacement field, strain field, and motion trajectory in real-time graphics, effectively solving the technical problems of large full-field monitoring area, small displacement amplitude, and high vibration frequency existing in the plate-shaped structure during the fluid-induced instability experiment of the simulated fuel element; 2. The present invention can realize the displacement measurement at the sub-pixel level of the arc-shaped plate fuel assembly simulation part, with the minimum displacement resolution of up to 0.1 micrometer and the minimum strain resolution of up to 10 microstrains; during the fluid erosion experiment, the vibration displacement of the simulation part is generally in the range of several micrometers to dozens of micrometers, making the displacement measurement error of the arc-shaped plate fuel assembly simulation part not greater than 10%.

[0055] 3. The present invention can perform full-field measurement in a non-contact manner, is not limited to a single point, has extremely loose requirements for the experimental environment, and has the advantages of full-field measurement, strong anti-interference ability, and high measurement accuracy; 4. The present invention is applicable to arc plate shapes with various curvature radii and is not limited by the arc plate material.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plate-like structure fluid-induced instability measurement system, characterized in that Comprising: A support frame; A support structure disposed on the support frame, the support structure being made of a transparent material and having a through hollow region formed therein; A simulation unit, including: a plurality of plate-shaped simulation members (301), the plurality of plate-shaped simulation members (301) being inserted into the hollow region, and flow channels (302) being formed between adjacent two of the plate-shaped simulation members (301) and between the plate-shaped simulation members (301) and the inner wall of the support structure; A monitoring subsystem for monitoring the surface feature information of the plate-shaped simulation members (301) through the support structure, so as to obtain the deformed morphology of the plate-shaped simulation members (301) under fluid erosion.

2. The plate-like structure fluid-induced instability measurement system according to claim 1, characterized in that The cross-sectional shapes of the hollow region and the plate-shaped simulation members (301) are both arc-shaped; and the cross-sectional shapes of the flow channels (302) formed between adjacent two of the plate-shaped simulation members (301) and between the plate-shaped simulation members (301) and the inner wall of the support structure are both arc-shaped.

3. The plate-like structure fluid-induced instability measurement system according to claim 1, characterized in that The cross-sectional shapes of the hollow region and the plate-shaped simulation members (301) are both rectangular; and the cross-sectional shapes of the flow channels (302) formed between adjacent two of the plate-shaped simulation members (301) and between the plate-shaped simulation members (301) and the inner wall of the support structure are both rectangular.

4. The plate-like structure fluid-induced instability measurement system according to claim 1, characterized in that The support structure includes: a first hollow support plate (101), a second hollow support plate (102), and a third hollow support plate (103) connected in sequence from top to bottom, and an installation groove (1021) is formed in the hollow region of the second hollow support plate (102); The simulation unit further includes: a limit connecting member (303) disposed at both ends along the width direction of the plate-shaped simulation member (301) and connecting the plate-shaped simulation members (301), the limit connecting member (303) being adapted to be inserted into the installation groove (1021) and limiting the plate-shaped simulation member (301) within the hollow region of the second hollow support plate (102).

5. The plate-like structure fluid-induced instability measurement system according to claim 4, characterized in that, The support structure further includes: A first flange skirt (104) fixed to the bottom of the first hollow support plate (101); A second flange skirt (105) fixed to the top of the second hollow support plate (102) and connected to the first flange skirt (104); A third flange skirt (106) fixed to the bottom of the second hollow support plate (102); A fourth flange skirt (107) fixed to the top of the third hollow support plate (103) and connected to the third flange skirt (106).

6. The plate-like structure fluid-induced instability measurement system according to claim 5, wherein, The support structure further includes: a first gasket (108) and a second gasket (109); Wherein, the second flange skirt (105) and the first flange skirt (104) are tightly connected through the first gasket (108) and fasteners, and the fourth flange skirt (107) and the third flange skirt (106) are tightly connected through the second gasket (109) and fasteners.

7. The plate-like structure fluid-induced instability measurement system according to claim 4, characterized in that, The support structure further includes: The lug (110) is fixed to both sides of the second hollow support plate (102) and is connected to the support frame; The fifth flange skirt support (111) is fixed to the bottom of the third hollow support plate (103) and is connected to the support frame.

8. The plate-like structure fluid-induced instability measurement system according to claim 7, characterized in that, The support frame includes: a first vertical column (201), a second vertical column (202), a third vertical column (203), a fourth vertical column (204), a first horizontal reinforcing rib (205), a second horizontal reinforcing rib (206), a third horizontal reinforcing rib (207), a fourth horizontal reinforcing rib (208), a fifth horizontal reinforcing rib (209), and a sixth horizontal reinforcing rib (210); Wherein, the first horizontal reinforcing rib (205) and the second horizontal reinforcing rib (206) are respectively connected between the first vertical column (201) and the second vertical column (202), the third horizontal reinforcing rib (207) and the fourth horizontal reinforcing rib (208) are respectively connected between the third vertical column (203) and the fourth vertical column (204), and the fifth horizontal reinforcing rib (209) and the sixth horizontal reinforcing rib (210) are respectively connected between the second horizontal reinforcing rib (206) and the third vertical column (203); The lug (110) is fixedly connected to the first horizontal reinforcing rib (205) and the third horizontal reinforcing rib (207) respectively through fasteners; The fifth flange skirt support (111) is fixedly connected to the second horizontal reinforcing rib (206) and the fourth horizontal reinforcing rib (208) respectively through fasteners.

9. The plate - like structure fluid - induced instability measurement system according to any one of claims 1 to 8, characterized in that, The monitoring subsystem includes: A white light source (401) for passing through the support structure and irradiating the plate-like simulation member (301); An image acquisition device (402) for acquiring the surface feature information of the plate-like simulation member (301) before and after deformation; A processor (403) for obtaining the deformed morphology of the plate-like simulation member (301) under fluid erosion according to the surface feature information acquired by the image acquisition device (402).

10. The plate-like structure fluid-induced instability measurement system according to claim 9, characterized in that, Markers are provided on the outer surface of the plate-like simulation member (301) as the marker points acquired by the image acquisition device (402).

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