A three-dimensional visualization optical fiber probe coupling measurement system for a rod bundle channel

Abstract

The application provides a kind of bundle channel three-dimensional visualization optical fiber probe coupling measurement system.The measurement system includes probe driving device, sealing device, visualization system, control system and data acquisition system.Probe driving device can drive optical fiber probe to realize three-dimensional free movement in bundle channel;Sealing device adopts double sealing mode of extrusion high-temperature sealing ring to ensure the sealing of the channel during probe movement;Visualization system includes high-transparency PC material visualization test section and high-speed camera, which can realize synchronous movement with optical fiber probe;Control system realizes remote precise control, and data acquisition system synchronously collects parameters and flow field images and carries out comparative analysis.The application has simple structure, convenient operation, accurate movement, can realize phase distribution visualization observation and local two-phase flow parameter precise coupling measurement in bundle channel, and provides reliable experimental support for reactor thermal hydraulic characteristic research, design optimization and safety evaluation.

Description

Technical Field

[0001] This invention relates to the field of fluid mechanics, and in particular to a three-dimensional visualization fiber optic probe coupling measurement system for rod bundle channels. Background Technology

[0002] In the current global application and development of nuclear energy, the gas-liquid two-phase flow characteristics of the rod bundle channels within the fuel assemblies directly affect the reactor's heat and mass transfer efficiency and flow resistance, thus impacting the reactor's safe and stable operation and design optimization. Under normal operation and accident conditions in pressurized water reactors, gas-liquid two-phase flow occurs within the rod bundle channels. The migration, aggregation, and breakup of bubbles within the sub-channels lead to uneven distribution of key parameters such as void fraction and local flow velocity, thereby affecting coolant flow resistance and fuel assembly heat transfer characteristics. Therefore, accurate measurement of the phase distribution and local parameters within the rod bundle channels, combined with visualized flow field observation, is a core prerequisite for reactor thermal-hydraulic research, design optimization, and safety assurance.

[0003] Currently, fiber optic probes have become the core equipment for detecting local parameters in rod bundle channels due to their small size, fast response, high precision, and strong resistance to electromagnetic interference. A visualization system composed of high-speed cameras can intuitively present the flow field morphology, and the coupling of the two can realize the dual needs of "parameter measurement + flow field observation". However, the rod bundle channel is composed of multiple fuel rods arranged in an orderly manner, with a complex internal structure and narrow space. Fuel rod obstruction poses a great challenge to the coordinated application of the two.

[0004] Fiber optic probes can only perform single-point measurements and require three-dimensional movement within the channel to obtain full-section parameters. Furthermore, the channel must be sealed during movement to prevent media leakage from affecting measurement accuracy. At the same time, the high-speed camera must move synchronously with the probe to achieve precise coupling between flow field observation and parameter measurement. Existing solutions cannot meet these requirements simultaneously.

[0005] Existing measurement schemes have obvious limitations: some schemes simplify the layout of measurement points and use the average value of local parameters to replace the full cross-sectional data, which increases the measurement error; some manually adjusted probes are inefficient, have poor accuracy, and may damage the equipment; in a few improved schemes, fixed multi-probe arrays increase system complexity, one-dimensional or two-dimensional moving mechanisms cannot achieve three-dimensional movement, and do not take into account the requirements of synchronous visualization and sealing, which can easily lead to media leakage.

[0006] As reactor design standards improve, the requirements for precision and coordination in measurements are increasing, and existing solutions can no longer meet these needs. Therefore, it is necessary to design a simple, precise, and reliably sealed coupled measurement system to drive the fiber optic probe in three dimensions within the rod bundle channel, achieving synchronous movement and precise coupling with a high-speed camera, ensuring sealing performance, acquiring full-section parameters and flow field data, and providing reliable experimental evidence for reactor-related research and safety assessment. Summary of the Invention

[0007] The purpose of this invention is to address the problems in existing technologies by proposing a three-dimensional visualization fiber optic probe coupled measurement system for rod bundle channels. This system couples the visualization of phase distribution within the rod bundle channels with the precise measurement of local two-phase flow parameters, providing reliable support for the study of reactor thermal-hydraulic characteristics.

[0008] This invention is achieved through the following technical solution: A three-dimensional visualization fiber optic probe coupling measurement system for rod bundle channels is proposed. The measurement system includes a probe driving device, a sealing device, a visualization system, a control system, and a data acquisition system. The probe driving device includes a fiber optic probe 11, a slider 9, a three-dimensional moving base 1, a radial adjustment slide 2, and a probe driving slide 3. The sealing device includes a sealing fixing plate 7, a sealing plate 8, a sealing locking element 13, and a back plate 10. The visualization system includes a visualization test section 6 and a high-speed camera 5. The control system is used for remotely controlling the movement of each slide and selecting the synchronization mode. The data acquisition system is used to synchronously acquire probe parameters and high-speed photographic images and perform comparative analysis, realizing visualized observation of phase distribution within the rod bundle channel and precise coupling measurement of local two-phase flow parameters.

[0009] Furthermore, the fiber optic probe 11 is fixed in the slider 9, and the end of the probe is connected to the probe driving slide 3, which can realize the precise radial movement of the probe; the slider 9 is connected to the radial adjustment slide 2 by the sealing bolt 12, and the two-dimensional movement of the probe in the same plane can be realized by moving the slider 9.

[0010] Furthermore, the entire probe driving device is mounted on the surface of the three-dimensional moving base 1, which enables the device to move axially as a whole, thereby driving the fiber probe 11 to move freely in three dimensions within the rod bundle channel.

[0011] Furthermore, the sealing fixing plate 7, the sealing plate 8 and the back plate 10 are connected by bolts; the sealing fixing plate 7 is fixed to the preset installation position on the side wall of the visualization test section 6, the sealing plate 8 and the back plate 10 are symmetrically arranged on both sides of the slider 9, and the sealing plate 8 is fastened to the sealing fixing plate 7 by bolts.

[0012] Furthermore, a rectangular sealing ring groove 15 is designed on the sealing plate 8, and a sealing ring is embedded in the rectangular sealing ring groove 15. The sealing of the slider 9 and the sealing plate 8 is achieved by the compression action of the sealing bolt 12. The sealing ring is deformed by the compression action of the sealing plate 8 and the slider 9 to achieve static sealing. The sealing locking part 13 is threadedly connected to the slider 9. Dynamic sealing is achieved during the radial movement of the fiber optic probe 11 by compressing the high-temperature resistant sealing ring 17 inside the slider 9.

[0013] Furthermore, the backplate 10 is designed with apertures 18 for probe movement.

[0014] Furthermore, the visualization test section 6 is made of highly transparent PC material, and the wall surface is designed with channels for probe movement; the high-speed camera 5 is fixed on the visualization slide 4 by an adjustable bracket, and works in conjunction with the probe driving device to achieve synchronous movement with the fiber optic probe 11, ensuring that the observation field of view corresponds precisely with the probe measurement point.

[0015] Furthermore, the control system uses remote program control to precisely control the movement of the three-dimensional moving base 1, the radial adjustment slide 2, the probe driving slide 3, and the visualization slide 4, and flexibly selects whether the high-speed camera 5 and the fiber optic probe 11 move synchronously, thereby achieving precise positioning and movement control of the measurement position.

[0016] Furthermore, the data acquisition system acquires the two-phase flow parameters detected by the fiber optic probe 11 and simultaneously acquires the flow field images captured by the high-speed camera 5; it is equipped with a dedicated image post-processing program to analyze the acquired flow field images, extract bubble distribution and phase interface evolution information, and compare and analyze them with the probe measurement data.

[0017] Furthermore, both the visualization slide 4 and the radial adjustment slide 2 are fixed to the upper surface of the three-dimensional moving base 1 by bolts, while the probe driving slide 3 is fixed to the upper surface of the radial adjustment slide 2. The visualization slide 4 and the radial adjustment slide 2 are arranged in parallel, and the probe driving slide 3 is perpendicular to both of them. The three cooperate with each other to realize the three-dimensional movement of the fiber optic probe 11.

[0018] The beneficial effects of this invention are: (1) A three-dimensional visualization fiber optic probe coupling measurement system for rod bundle channels was designed, which can realize the accurate measurement of two-phase flow parameters and the visualization observation of flow field at various locations in the rod bundle channel.

[0019] (2) The probe driving device and the control system are combined to realize the three-dimensional automatic movement of the fiber probe in the rod bundle channel. The movement is precise and the operation is convenient, which is suitable for the measurement needs of the narrow space of the rod bundle channel.

[0020] (3) The sealing device adopts a double sealing method of extruding high temperature resistant sealing ring to ensure the sealing of the test device during the three-dimensional movement of the probe and avoid the medium leakage affecting the measurement accuracy.

[0021] (4) By controlling the synchronous movement of the high-speed camera and the fiber optic probe, the visualization measurement results and the probe measurement results are accurately coupled and compared, thereby improving the reliability and integrity of the measurement data. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a three-dimensional visualization fiber optic probe coupling measurement system for a rod bundle channel according to the present invention; Figure 2 This is a schematic diagram of the sealing plate structure; Figure 3 This is a schematic diagram of the slider's structure; Figure 4 This is a schematic diagram of the back panel structure; Figure 5 This is a schematic diagram of the fastener's structure.

[0024] The following are the labels in the attached figures: 1. Three-dimensional moving base; 2. Radial adjustment slide; 3. Probe driving slide; 4. Visualization slide; 5. High-speed camera; 6. Visualization test section; 7. Sealing fixing plate; 8. Sealing plate; 9. Slider; 10. Back plate; 11. Fiber optic probe; 12. Sealing bolt; 13. Sealing locking element; 14. Bolt hole; 15. Rectangular sealing ring groove; 16. Sealing locking element groove; 17. High-temperature resistant sealing ring; 18. Probe moving hole. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Combination Figures 1-5This invention proposes a three-dimensional visualization fiber optic probe coupling measurement system for rod bundle channels. The measurement system includes a probe driving device, a sealing device, a visualization system, a control system, and a data acquisition system. The probe driving device includes a fiber optic probe 11, a slider 9, a three-dimensional moving base 1, a radial adjustment slide 2, and a probe driving slide 3. The sealing device includes a sealing fixing plate 7, a sealing plate 8, a sealing locking element 13, and a back plate 10. The visualization system includes a visualization test section 6 and a high-speed camera 5. The control system is used to remotely control the movement of each slide and select the synchronization mode. The data acquisition system is used to synchronously acquire probe parameters and high-speed photographic images and perform comparative analysis to achieve visualized observation of phase distribution within the rod bundle channel and precise coupling measurement of local two-phase flow parameters.

[0027] Furthermore, the fiber optic probe 11 is fixed in the slider 9, and the end of the probe is connected to the probe driving slide 3, which can realize the precise radial movement of the probe; the slider 9 is connected to the radial adjustment slide 2 by the sealing bolt 12, and the two-dimensional movement of the probe in the same plane can be realized by moving the slider 9.

[0028] Furthermore, the entire probe driving device is mounted on the surface of the three-dimensional moving base 1, which enables the device to move axially as a whole, thereby driving the fiber optic probe 11 to move freely in three dimensions within the rod bundle channel, meeting the measurement needs of different positions.

[0029] Furthermore, the sealing fixing plate 7, sealing plate 8 and back plate 10 are connected by bolts, which makes the installation firm and the disassembly convenient; the sealing fixing plate 7 is fixed to the preset installation position on the side wall of the visualization test section 6, and the sealing plate 8 and back plate 10 are symmetrically arranged on both sides of the slider 9. The sealing plate 8 is fastened to the sealing fixing plate 7 by bolts.

[0030] Furthermore, a rectangular sealing ring groove 15 is designed on the sealing plate 8, and a sealing ring is embedded in the rectangular sealing ring groove 15. The sealing of the slider 9 and the sealing plate 8 is achieved by the compression action of the sealing bolt 12. The sealing ring is deformed by the compression action of the sealing plate 8 and the slider 9 to achieve static sealing. The sealing locking part 13 is threadedly connected to the slider 9. By compressing the high-temperature resistant sealing ring 17 in the slider 9, dynamic sealing is achieved during the radial movement of the fiber optic probe 11, which effectively prevents the leakage of the medium in the channel and ensures the stability of the measurement environment.

[0031] Furthermore, the backplate 10 is designed with apertures 18 for probe movement, which does not affect the three-dimensional movement of the probe.

[0032] Furthermore, the visualization test section 6 is made of highly transparent PC material, which facilitates the high-speed camera to capture the flow field morphology within the channel. The wall is designed with channels for probe movement, adapting to the three-dimensional movement requirements of the probe. The high-speed camera 5 is fixed on the visualization slide 4 by an adjustable bracket and works in conjunction with the probe drive device to achieve synchronous movement with the fiber optic probe 11, ensuring that the observation field of view corresponds precisely to the probe measurement point.

[0033] Furthermore, the control system is remotely controlled by a program to precisely control the movement of the three-dimensional moving base 1, the radial adjustment slide 2, the probe driving slide 3, and the visualization slide 4, and flexibly select whether the high-speed camera 5 and the fiber optic probe 11 move synchronously, thereby achieving precise positioning and movement control of the measurement position without the need for manual on-site operation and avoiding operational deviations.

[0034] Furthermore, the data acquisition system acquires two-phase flow parameters such as cavitation fraction, temperature, and flow velocity detected by the fiber optic probe 11, and simultaneously acquires flow field images captured by the high-speed camera 5; it is equipped with a dedicated image post-processing program to analyze the acquired flow field images, extract information such as bubble distribution and phase interface evolution, and compare and analyze them with the probe measurement data to achieve coupled verification of parameter measurement and visualization observation.

[0035] Furthermore, both the visualization slide 4 and the radial adjustment slide 2 are fixed to the upper surface of the three-dimensional moving base 1 by bolts, while the probe driving slide 3 is fixed to the upper surface of the radial adjustment slide 2. The visualization slide 4 and the radial adjustment slide 2 are arranged in parallel, and the probe driving slide 3 is perpendicular to both of them. The three cooperate with each other to realize the three-dimensional movement of the fiber optic probe 11.

[0036] according to Figure 1The experimental setup consists of a measurement system with a three-dimensional moving base 1 horizontally fixed to the test bench, serving as the installation foundation and axial movement carrier for the entire measurement system. Its movement range fully covers the height range of the visualized test section. The visualized slide 4 and the radially adjustable slide 2 are both bolted to the upper surface of the three-dimensional moving base. Simultaneously, the probe drive slide 3 is fixed to the upper surface of the radially adjustable slide 2. The visualized slide 4 and the radially adjustable slide 2 are arranged parallel to each other, while the probe drive slide 3 is perpendicular to both. These three components work together to achieve the three-dimensional movement of the probe. The high-speed camera 5 is fixed to the visualized slide 4 via an adjustable bracket. Adjusting the bracket's angle and height ensures that the high-speed camera 5 is directly facing the visualized slide 4. The observation area of ​​the visualization test section 6; the fiber optic probe 11 passes through the reserved channels of the sealing locking component 13 and the slider 9 in sequence, and the tail end is fixedly connected to the probe drive slide 3. The front end of the probe can be smoothly extended into the rod bundle channel of the visualization test section 6; the sealing device consists of a sealing fixing plate 7, a sealing plate 8, a back plate 10 and a high-temperature resistant sealing ring 17. The sealing fixing plate 7 is fixed to the preset installation position on the side wall of the visualization test section 6. The sealing plate 8 and the back plate 10 are symmetrically arranged on both sides of the slider 9. The sealing plate 8 is provided with bolt holes 14, which are fastened to the sealing fixing plate 7 by bolts; the slider 9 is provided with a sealing locking component groove 16, and the sealing locking component 13 is embedded in the sealing locking component groove 16. The sealing plate 8 has a pre-set rectangular sealing ring groove 15 in which the sealing ring is embedded. The sealing bolt 12 is used to squeeze the slider 9 and the sealing plate 8 to achieve a seal. The sealing locking part 13 is threadedly connected to the slider 9. By tightening the sealing locking part 13, the high temperature resistant sealing ring 17 in the slider 9 is squeezed to achieve dynamic sealing during the movement of the fiber optic probe 11. The control system is connected to the three-dimensional moving base 1, the visualization slide 4, the radial adjustment slide 2 and the probe driving slide 3 respectively to achieve remote and precise control of each part.

[0037] This invention proposes a three-dimensional visualization fiber optic probe coupled measurement system for rod bundle channels, comprising a probe driving device, a sealing device, a visualization system, a control system, and a data acquisition system. The probe driving device consists of a fiber optic probe, a slider, a three-dimensional moving base, a radial adjustment slide, and a probe driving slide, enabling the fiber optic probe to move freely in three dimensions within the rod bundle channel. The sealing device employs a double sealing method using extruded high-temperature resistant sealing rings to ensure channel sealing during probe movement. The visualization system includes a highly transparent PC material visualization test section and a high-speed camera, enabling synchronous movement with the fiber optic probe. The control system provides remote and precise control, while the data acquisition system synchronously acquires parameters and flow field images for comparative analysis. This invention features a simple structure, convenient operation, and precise movement, enabling visualized observation of phase distribution within the rod bundle channel and precise coupled measurement of local two-phase flow parameters, providing reliable experimental support for reactor thermal-hydraulic characteristic research, design optimization, and safety assessment.

[0038] The above provides a detailed description of the three-dimensional visualization fiber optic probe coupling measurement system for rod bundle channels proposed in this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A three-dimensional visualization fiber optic probe coupling measurement system for rod bundle channels, characterized in that, The measurement system includes a probe driving device, a sealing device, a visualization system, a control system, and a data acquisition system. The probe driving device includes an optical fiber probe (11), a slider (9), a three-dimensional moving base (1), a radial adjustment slide (2), and a probe driving slide (3). The sealing device includes a sealing fixing plate (7), a sealing plate (8), a sealing locking component (13), and a back plate (10). The visualization system includes a visualization test section (6) and a high-speed camera (5). The control system is used to remotely control the movement of each slide and select the synchronization mode. The data acquisition system is used to synchronously acquire probe parameters and high-speed photographic images and perform comparative analysis to realize the visualization observation of phase distribution in the rod bundle channel and the precise coupling measurement of local two-phase flow parameters.

2. The measurement system according to claim 1, characterized in that, The fiber optic probe (11) is fixed in the slider (9), and the end of the probe is connected to the probe drive slide (3), which can realize the precise radial movement of the probe; the slider (9) is connected to the radial adjustment slide (2) through the sealing bolt (12), and the probe can move in two dimensions on the same plane by moving the slider (9).

3. The measurement system according to claim 2, characterized in that, The entire probe driving device is installed on the surface of the three-dimensional moving base (1), which can realize the overall axial movement of the device, thereby driving the fiber probe (11) to realize three-dimensional free movement within the rod bundle channel.

4. The measurement system according to claim 1, characterized in that, The sealing fixing plate (7), sealing plate (8) and back plate (10) are connected by bolts; the sealing fixing plate (7) is fixed to the preset installation position on the side wall of the visualization test section (6), the sealing plate (8) and back plate (10) are symmetrically arranged on both sides of the slider (9), and the sealing plate (8) is fastened to the sealing fixing plate (7) by bolts.

5. The measurement system according to claim 4, characterized in that, A rectangular sealing ring groove (15) is designed on the sealing plate (8). The sealing ring is embedded in the rectangular sealing ring groove (15). The sealing of the slider (9) and the sealing plate (8) is achieved by the squeezing action of the sealing bolt (12). The sealing ring is deformed by the squeezing action of the sealing plate (8) and the slider (9) to achieve static sealing. The sealing locking part (13) is threadedly connected to the slider (9). The dynamic sealing of the fiber optic probe (11) during radial movement is achieved by squeezing the high-temperature resistant sealing ring (17) in the slider (9).

6. The measurement system according to claim 1, characterized in that, The backplate (10) is designed with apertures (18) for probe movement.

7. The measurement system according to claim 1, characterized in that, The visualization test section (6) is made of highly transparent PC material, and the wall is designed with a channel for probe movement. The high-speed camera (5) is fixed on the visualization slide (4) by an adjustable bracket and works in coordination with the probe drive device to achieve synchronous movement with the fiber optic probe (11) to ensure that the observation field of view corresponds precisely with the probe measurement point.

8. The measurement system according to claim 1, characterized in that, The control system uses remote program control to precisely control the movement of the three-dimensional moving base (1), the radial adjustment slide (2), the probe driving slide (3) and the visualization slide (4), and flexibly select whether the high-speed camera (5) and the fiber optic probe (11) move synchronously, so as to achieve precise positioning and movement control of the measurement position.

9. The measurement system according to claim 1, characterized in that, The data acquisition system acquires the two-phase flow parameters detected by the fiber optic probe (11) and simultaneously acquires the flow field images captured by the high-speed camera (5); it is equipped with a dedicated image post-processing program to analyze the acquired flow field images, extract bubble distribution and phase interface evolution information, and compare and analyze them with the probe measurement data.

10. The measurement system according to claim 8, characterized in that, The visualization slide (4) and the radial adjustment slide (2) are both fixed to the upper surface of the three-dimensional moving base (1) by bolts. At the same time, the probe driving slide (3) is fixed to the upper surface of the radial adjustment slide (2). The visualization slide (4) and the radial adjustment slide (2) are arranged in parallel, and the probe driving slide (3) is perpendicular to the two. The three cooperate with each other to realize the three-dimensional movement of the fiber optic probe (11).

Images