Multi-field control jet test device and method suitable for CT rapid three-dimensional imaging

Abstract

The invention discloses a multi-field control jet testing device and method suitable for CT rapid three-dimensional imaging, and belongs to the field of jet testing, the multi-field control jet testing device comprises a multi-field control jet testing device and a CT rapid three-dimensional imaging system.The multi-field control jet testing device comprises a jet channel and a fluid circulation passage which are communicated, and a solid sample is arranged in the jet channel; the fluid circulation passage is communicated with a multi-channel liquid injector for injecting jet fluid; the CT fast three-dimensional imaging system comprises one or more CT imaging assemblies arranged around the jet flow channel, and the CT imaging assemblies correspond to single-light-path imaging and multi-light-path imaging respectively. By adopting the multi-field control jet flow test device and method suitable for CT rapid three-dimensional imaging, fluid-solid jet flow tests under different jet flow velocity, different temperatures and different flow boundary conditions can be realized, and meanwhile, a dynamic three-dimensional image of a fluid-solid two-phase migration process is obtained by combining a high-resolution CT rapid three-dimensional imaging technology, so that the test efficiency is improved. And the micro mechanism of multiple types of fluid-solid migration phenomena can be explored.

Description

Technical Field

[0001] The invention relates to the technical field of jet test, and in particular to a multi-field controlled jet test device and method suitable for CT fast three-dimensional imaging. Background Art

[0002] Fluid mechanics has developed to the point where it not only occupies a place in the basic science system, but also has wide applications in engineering industry, medicine, earth science and astronomy. Among them, the jet fluid is deflected by the solid phase material, generating attraction to achieve a new mutual equilibrium state. This phenomenon is a representative problem of the interaction between fluid and structure. At present, there are calculation methods to predict the equilibrium position of solid particles in a vertical jet, but the dynamic characteristics of solid particles under the action of the jet, that is, the distance of the equilibrium position from the jet outlet and the motion state, have not been fully studied, and there is a lack of corresponding experimental equipment. In addition, in the field of geotechnical and water conservancy engineering, many major infrastructure projects face the key problem of how to prevent and control soil piping. This phenomenon can be converted into the problem of fluid jet spraying solid particles. Therefore, exploring the mechanism of interaction between the jet fluid and the solid particles has great application value for the prediction and prevention of piping disasters in the field of geotechnical and water conservancy engineering.

[0003] At the same time, 3D CT (Computer Tomography) technology provides an effective technical means for analyzing and studying the internal structure of materials due to its non-destructive nature, and has been widely used in various fields. Among them, in the field of particle kinematics research, 3D CT imaging technology has played a huge role in the imaging, identification and analysis of static particles, and is therefore used to study their microscopic characteristics. However, conventional CT scanning technology has significant limitations in time resolution, and because it requires relatively complex radiation image acquisition in multiple directions, it is impossible to achieve rapid dynamic 3D imaging of the entire jet test process. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-field controlled jet test device and method suitable for CT fast three-dimensional imaging to solve the above technical problems.

[0005] To achieve the above-mentioned object, the present invention provides a multi-field controlled jet test device suitable for CT fast three-dimensional imaging, comprising a multi-field controlled jet test device and a CT fast three-dimensional imaging system, wherein the multi-field controlled jet test device comprises a connected jet channel and a fluid circulation path, a solid sample is built in the jet channel, and the fluid circulation path is connected to a multi-channel liquid injector for injecting jet fluid; The CT fast three-dimensional imaging system includes one or more groups of CT imaging components (single optical path or multi-optical path imaging) arranged around the jet channel, and each group of CT imaging components includes an X-ray source and a high-frequency ray detector arranged symmetrically about the center of the jet channel.

[0006] Preferably, the jet channel consists of a channel shell and a jet base, and a removable porous plate is provided at the top and bottom ends of the jet channel. The top and bottom ends of the jet channel are connected to the fluid circulation passage through the porous plate, and a first flow velocity sensor, a flow control valve, a multi-channel liquid filler, a circulation pump and a second flow velocity sensor are sequentially arranged on the fluid circulation passage.

[0007] Preferably, a temperature control component is also provided at the top and bottom ends of the jet channel, and the temperature control component includes a temperature variable element and a temperature sensor arranged around the top or bottom end of the jet channel, the temperature sensor is electrically connected to the input end of the temperature controller, and the output end of the temperature controller is electrically connected to the temperature variable element.

[0008] Preferably, when the solid sample is an object of a single size and regular shape, the CT fast three-dimensional imaging system is composed of single-light path imaging including a set of CT imaging components, otherwise the CT fast three-dimensional imaging system is composed of multi-light path imaging including multiple sets of CT imaging components.

[0009] Preferably, the ratio of the diameter to the length of the jet channel is 1:10.

[0010] Preferably, the channel housing and the jet base are both made of PMMA.

[0011] Preferably, the flow boundary condition of the channel shell is set to a smooth boundary, an irregular boundary or a porous medium.

[0012] The test method of a multi-field controlled jet test device suitable for CT fast three-dimensional imaging comprises the following steps: S1, flow boundary conditions of the selected channel shell and the type of porous plate; S2. Assemble the multi-field controlled jet test equipment: install a porous plate at the bottom of the jet channel, place the solid sample inside the jet channel, then install a porous plate at the top of the jet channel, and then use bolts to fix the selected channel shell to the jet base, and install fluid circulation paths at both ends of the jet channel; S3, determining the number of groups of CT imaging components according to the size and shape of the solid sample, and arranging the determined number of groups of CT imaging components around the jet channel; S4, opening the multi-channel liquid injector, injecting the jet fluid into the fluid circulation passage and the jet channel until the jet fluid fills the fluid circulation passage and the jet channel, and closing the multi-channel liquid injector; S5, turning on the circulation pump, and adjusting the flow control valve to control the jet fluid to circulate in the fluid circulation passage and the jet channel at a set flow rate; S6, turn on the thermostat, gradually increase the current of the temperature variable element, until the temperature sensor detects that the jet channel has reached the set temperature, and maintain the current; S7, turning on the X-ray source and the high-frequency ray detector, the ray beam emitted by the X-ray source passes through the solid sample and the jet fluid in the jet channel and is attenuated, the attenuated photoelectric signal is received by the high-frequency ray detector and converted into a digital signal, the CT grayscale projection image is reconstructed by a computer, each phase of the material is presented in the form of different grayscale values, and a dynamic three-dimensional image of the fluid-solid two-phase jet test under multi-field control conditions is obtained; S8. Change the flow boundary conditions of the channel shell or the type of the porous plate, and repeat steps S1 to S7 to obtain a dynamic three-dimensional image of the fluid-solid two-phase jet test under multi-field control conditions under multiple conditions.

[0013] Preferably, the flow boundary condition described in step S1 is a smooth boundary, an irregular boundary or a porous medium.

[0014] Therefore, the present invention adopts the above-mentioned multi-field controlled jet test device and method suitable for CT fast three-dimensional imaging, which has the following beneficial effects: 1. Accurate multiphase flow monitoring: Real-time 3D imaging: Through the integrated CT fast 3D imaging system, high-resolution, non-invasive real-time 3D imaging of the interaction between solid samples and jet fluids can be performed during the experiment. This allows researchers to intuitively observe changes in the internal structure, thereby more accurately analyzing flow phenomena and improving the overall accuracy of the test; Dynamic reconstruction algorithm: The CT grayscale projection images processed by the image reconstruction algorithm are used to generate clear dynamic three-dimensional images of the fluid-solid two-phase jet test under multi-field control conditions, which helps to deeply understand the complex physical process; 2. Flexible and controllable experimental conditions: Multiple flow boundary conditions can be selected: The flow boundary of the channel shell can be set to a smooth boundary, an irregular boundary or a variety of porous media to simulate different engineering application scenarios. This flexibility allows researchers to explore the behavior characteristics of materials under various boundary conditions; Precise control of temperature and flow rate: Adding temperature field control and flow boundary control can realize multi-condition coupling research of fluid temperature, jet velocity and flow boundary, which can meet the multi-faceted and comprehensive needs of the test; 3. Efficient data collection and processing: High degree of automation: From setting and executing test conditions to data collection and finally 3D image reconstruction, the entire process is almost fully automated, which not only improves work efficiency but also reduces manual errors; Fast feedback mechanism: The organic combination of high-frequency ray detectors and CT fast three-dimensional imaging technology ensures real-time projection imaging of the entire dynamic test process; 4. Wide range of applications: Interdisciplinary research support: The device is applicable to many fields, including but not limited to materials science, chemical engineering, energy, etc. For example, it can simulate the internal conditions of oil wells in oil production; study the dynamic processes in the engine combustion chamber in the aerospace field; or analyze the hemodynamic characteristics of blood vessels in biomedicine; Optimization design tools: By studying the behavior of materials under different conditions, engineers can improve existing product designs and develop new materials and processes with better performance; 5. System integration design: compact and modular: the multi-field controlled jet test equipment is organically combined with the CT fast three-dimensional imaging system to form a complete test platform. This integrated design not only saves space, but also facilitates transportation, maintenance and expansion of functions; Easy to assemble and disassemble: key components such as porous plates and jet channels are all detachably connected, which is convenient for replacement and cleaning, extending the service life of the equipment; In summary, the multi-field controlled jet test device suitable for CT fast three-dimensional imaging described in the present invention combines advanced imaging technology and a precise control system, providing a powerful tool to study complex multiphase flow phenomena. It not only has the characteristics of high precision and strong flexibility, but also has a wide range of applications, and is of great significance for promoting scientific research in related fields.

[0015] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a layout diagram of a multi-field controlled jet test device suitable for CT fast three-dimensional imaging when the solid sample is of a single size and a regular shape according to the present invention; Figure 2 It is a layout diagram of a multi-field controlled jet test device suitable for CT fast three-dimensional imaging when the solid sample is of non-uniform size and irregular shape or both of non-uniform size and irregular shape according to the present invention; Figure 3 The present invention is a schematic structural diagram of a multi-field controlled jet test device suitable for CT fast three-dimensional imaging.

[0017] Reference numerals 1. Solid sample; 2. Multi-field controlled jet test equipment; 21. Channel housing; 22. Jet channel; 23. Temperature variable element; 24. Jet base; 25. Bolt; 26. Temperature controller; 27. Fluid circulation passage; 28. Perforated plate; 29. ​​First flow velocity sensor; 210. Flow control valve; 211. Multi-channel liquid filler; 212. Circulation pump; 213. Second flow velocity sensor; 3. X-ray source; 4. High-frequency ray detector. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not used to limit the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0019] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0020] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0021] like Figure 1-Figure 3 As shown, a multi-field controlled jet test device suitable for CT fast three-dimensional imaging includes a multi-field controlled jet test device 2 and a CT fast three-dimensional imaging system, wherein the multi-field controlled jet test device 2 includes a connected jet channel 22 and a fluid circulation path 27, the jet channel 22 is equipped with a solid sample 1, and the fluid circulation path 27 is connected to a multi-channel liquid filler 211 for injecting jet fluid; the CT fast three-dimensional imaging system includes one or more groups of CT imaging components (single light path or multi-light path imaging) arranged around the jet channel 22, and each group of CT imaging components includes an X-ray source 3 and a high-frequency ray detector 4 arranged symmetrically about the center of the jet channel 22.

[0022] The jet channel 22 is composed of a channel housing 21 and a jet base 24. A removable porous plate 28 is provided at the top and bottom of the jet channel 22 to facilitate replacement of the porous plate 28. The porous plate has different numbers of holes or apertures to meet the conditions of different jet tests. In this embodiment, a groove for assembling the porous plate 28 is reserved at the flow boundary of the channel housing 21. The top and bottom of the jet channel 22 are connected to the fluid circulation passage 27 through the porous plate 28. The fluid circulation passage 27 is sequentially provided with a first flow velocity sensor 29, a flow control valve 210, a multi-channel liquid filler 211, a circulation pump 212 and a second flow velocity sensor 213, wherein the first flow velocity sensor 29 is used to detect the output flow velocity of the jet fluid, the second flow velocity sensor 213 is used to detect the return flow velocity of the jet fluid, the flow control valve 210 is used to control the circulation flow velocity of the jet fluid, and the circulation pump 212 is used to control the flow direction of the jet fluid (from bottom to top or from top to bottom).

[0023] The top and bottom ends of the jet channel 22 are also provided with temperature control components, which include a temperature variable element 23 and a temperature sensor arranged around the top or bottom end of the jet channel 22. The temperature sensor is electrically connected to the input end of the temperature controller 26, and the output end of the temperature controller 26 is electrically connected to the temperature variable element 23.

[0024] When the solid sample 1 is an object of a single size and regular shape, the CT fast three-dimensional imaging system is composed of single-light path imaging including a set of CT imaging components, otherwise the CT fast three-dimensional imaging system is composed of multi-light path imaging including multiple sets of CT imaging components.

[0025] The ratio of the diameter to the length of the jet channel 22 is 1:10, which can ensure that the solid sample 1 has enough space to move during the jetting process.

[0026] The channel housing 21 and the jet base 24 are both made of PMMA, which has the characteristics of being ray-penetrating, high-temperature-resistant, and lightweight.

[0027] The flow boundary condition (fluid boundary condition) of the channel shell 21 is set to a smooth boundary, an irregular boundary or a porous medium.

[0028] It should be noted that the above-mentioned electronic components are mature products on the market. This embodiment only needs to purchase them and connect them according to the instructions. No improvement is made to them, so their circuit connection structure and principle will not be described in detail here.

[0029] The test method of a multi-field controlled jet test device suitable for CT fast three-dimensional imaging comprises the following steps: S1, flow boundary conditions of the selected channel shell 21 and the type of the porous plate 28; The flow boundary condition described in step S1 is a smooth boundary, an irregular boundary or a porous medium.

[0030] S2. Assemble the multi-field controlled jet test equipment: install a porous plate 28 at the bottom of the jet channel 22, place the solid sample 1 inside the jet channel 22, then install a porous plate 28 at the top of the jet channel 22, and then use bolts 25 to fix the selected channel housing 21 on the jet base 24, and install fluid circulation passages 27 at both ends of the jet channel 22; S3, determining the number of groups of CT imaging components according to the size and shape of the solid sample 1, and arranging the determined number of groups of CT imaging components around the jet channel 22; S4, opening the multi-channel liquid injector 211, injecting the jet fluid into the fluid circulation passage 27 and the jet passage 22, until the jet fluid fills the fluid circulation passage 27 and the jet passage 22, and closing the multi-channel liquid injector 211; S5, turning on the circulation pump 212, and adjusting the flow control valve 210 to control the jet fluid to circulate in the fluid circulation passage 27 and the jet channel 22 at a set flow rate; S6, turn on the thermostat 26, gradually increase the current of the temperature variable element 23, until the temperature sensor detects that the jet channel 22 reaches the set temperature, and maintain the current; S7, turning on the X-ray source 3 and the high-frequency ray detector 4, the ray beam emitted by the X-ray source 3 passes through the solid sample 1 and the jet fluid in the jet channel 22 and is attenuated, the attenuated photoelectric signal is received by the high-frequency ray detector 4 and converted into a digital signal, the CT grayscale projection image is reconstructed by a computer, each phase of the material is presented in the form of different grayscale values, and a dynamic three-dimensional image of the fluid-solid two-phase jet test under multi-field control conditions is obtained; It should be noted that when the solid sample is a regular-shaped object of a single size, such as Figure 1 Single optical path imaging and Figure 2 The multi-path imaging shown in the figure can be used. When the solid sample is an irregularly shaped object with non-homogeneous properties, only the following can be used: Figure 2 Multi-path imaging is shown.

[0031] S8. Change the flow boundary conditions of the channel shell 21 or the type of the porous plate 28, and repeat steps S1 to S7 to obtain a dynamic three-dimensional image of the fluid-solid two-phase jet test under multi-field control conditions under multiple conditions.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A multi-field controlled jet test device suitable for CT fast three-dimensional imaging, characterized in that: It includes a multi-field controlled jet test device and a CT fast three-dimensional imaging system, wherein the multi-field controlled jet test device includes a connected jet channel and a fluid circulation path, the jet channel is equipped with a solid sample, and the fluid circulation path is connected to a multi-channel liquid filler for injecting jet fluid; the CT fast three-dimensional imaging system includes one or more groups of CT imaging components arranged around the jet channel, corresponding to single-light path imaging and multi-light path imaging respectively, and each group of CT imaging components includes an X-ray source and a high-frequency ray detector arranged symmetrically about the center of the jet channel.

2. The multi-field controlled jet test device suitable for CT fast three-dimensional imaging according to claim 1, characterized in that: The jet channel consists of a channel shell and a jet base. Removable porous plates are provided at the top and bottom of the jet channel. The top and bottom of the jet channel are connected to the fluid circulation passage through the porous plates. The first flow velocity sensor, flow control valve, multi-channel liquid filler, circulation pump and second flow velocity sensor are arranged in sequence on the fluid circulation passage.

3. The multi-field controlled jet test device suitable for CT fast three-dimensional imaging according to claim 2, characterized in that: The top and bottom of the jet channel are also provided with temperature control components, which include a temperature variable element and a temperature sensor arranged around the top or bottom of the jet channel. The temperature sensor is electrically connected to the input end of the temperature controller, and the output end of the temperature controller is electrically connected to the temperature variable element.

4. The multi-field controlled jet test device suitable for CT fast three-dimensional imaging according to claim 3, characterized in that: When the solid sample is an object of a single size and regular shape, the CT fast three-dimensional imaging system is composed of single-light path imaging including a set of CT imaging components, otherwise the CT fast three-dimensional imaging system is composed of multi-light path imaging including multiple sets of CT imaging components.

5. The multi-field controlled jet test device suitable for CT fast three-dimensional imaging according to claim 3, characterized in that: The ratio of the diameter to the length of the jet channel is 1:

10.

6. The multi-field controlled jet test device suitable for CT fast three-dimensional imaging according to claim 3, characterized in that: The channel housing and the jet base are both made of PMMA.

7. The multi-field controlled jet test device suitable for CT fast three-dimensional imaging according to claim 3, characterized in that: The flow boundary conditions of the channel shell are set as smooth interface, irregular interface or porous interface.

8. A test method for a multi-field controlled jet test device suitable for CT fast three-dimensional imaging based on any one of claims 4 to 7, characterized in that: The following steps are involved: S1, flow boundary conditions of the selected channel shell and the type of porous plate; S2. Assemble the multi-field controlled jet test equipment: install a porous plate at the bottom of the jet channel, place the solid sample inside the jet channel, then install a porous plate at the top of the jet channel, and then use bolts to fix the selected channel shell to the jet base, and install fluid circulation paths at both ends of the jet channel; S3, determining the number of groups of CT imaging components according to the size and shape of the solid sample, and arranging the determined number of groups of CT imaging components around the jet channel; S4, opening the multi-channel liquid injector, injecting fluid into the fluid circulation passage and the jet channel until the fluid circulation passage and the jet channel are filled, and closing the multi-channel liquid injector; S5, turning on the circulation pump, and adjusting the flow control valve to control the jet fluid to circulate in the fluid circulation passage and the jet channel at a set flow rate; S6, turn on the thermostat, gradually increase the current of the temperature variable element, until the temperature sensor detects that the jet fluid in the jet channel has reached the set temperature, and maintain the current state; S7, turning on the X-ray source and the high-frequency ray detector, the ray beam emitted by the X-ray source passes through the solid sample and the jet fluid in the jet channel and is attenuated, the attenuated photoelectric signal is received by the high-frequency ray detector and converted into a digital signal, the CT grayscale projection image is reconstructed by a computer, each phase of the material is presented in the form of different grayscale values, and a dynamic three-dimensional image of the fluid-solid two-phase jet test under multi-field control conditions is obtained; S8. Change the flow boundary conditions of the channel shell or the type of the porous plate, and repeat steps S1 to S7 to obtain a dynamic three-dimensional image of the fluid-solid two-phase jet test under multi-field control conditions.

9. The test method of the multi-field controlled jet test device suitable for CT fast three-dimensional imaging as claimed in claim 8, characterized in that: The flow boundary condition described in step S1 is a smooth boundary, an irregular boundary or a porous medium.

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