Multi-field control fluidic test device and method suitable for CT fast three-dimensional imaging

Abstract

The application discloses a multi-field control jet flow test device and method suitable for CT fast three-dimensional imaging, belongs to the jet flow test field, and comprises a multi-field control jet flow test device and a CT fast three-dimensional imaging system, wherein the multi-field control jet flow test device comprises a jet flow channel and a fluid circulation passage in communication, the jet flow channel is internally provided with a solid sample, and the fluid circulation passage is in communication with a multi-channel liquid filler for injecting jet flow fluid; the CT fast three-dimensional imaging system comprises one or more groups of CT imaging components arranged around the jet flow channel and corresponding to single-light-path imaging and multi-light-path imaging respectively. The multi-field control jet flow test device and method suitable for CT fast three-dimensional imaging can realize flow-solid jet flow tests under different jet flow velocities, different temperatures and different flow boundary conditions, and can obtain dynamic three-dimensional images of the flow-solid two-phase migration process by combining the high-resolution CT fast three-dimensional imaging technology, so as to facilitate the exploration of the micro mechanism of various flow-solid migration phenomena.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of jet flow test, in particular to a multi-field control jet flow test device and method suitable for CT fast three-dimensional imaging. BACKGROUND

[0002] Fluid mechanics has a place in the basic scientific system, and has wide application in engineering industry, medicine, geoscience and astronomy. Among them, the jet fluid is deflected by the solid phase material to generate attraction to achieve a new mutual balance state, which is a representative problem of fluid and structure interaction. At present, there is a calculation method for predicting the balance position of solid particles in vertical jet flow, but there is no sufficient research on the dynamic characteristics of solid particles under the action of jet flow, that is, the distance of the balance position from the jet outlet and the motion state, and there is a lack of corresponding test device. In addition, in the fields of geotechnical and water conservancy engineering, many major foundation projects face the key problem of how to prevent and control the soil piping phenomenon, which can be transformed into the problem of jet fluid dispersing solid particles, therefore, exploring the mechanism of interaction between jet fluid and solid particles has great application value for the prediction and prevention of piping disasters in the fields of geotechnical and water conservancy engineering.

[0003] At the same time, three-dimensional CT (Computer Tomography) technology (computer tomography technology) provides an effective technical means for analyzing 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, three-dimensional CT imaging technology has played a great role in imaging, identification and analysis of static particles, and has been used to study their micro characteristics. However, the conventional CT scanning technology has significant limitations in time resolution, and because it needs to obtain complex radiation images in multiple directions, it cannot realize fast dynamic three-dimensional imaging of the whole process of jet flow test. SUMMARY

[0004] The purpose of the present application is to provide a multi-field control jet flow test device and method suitable for CT fast three-dimensional imaging, which solves the above technical problems.

[0005] To achieve the above purpose, the present application provides a multi-field control jet flow test device suitable for CT fast three-dimensional imaging, which comprises a multi-field control jet flow test device and a CT fast three-dimensional imaging system, wherein the multi-field control jet flow test device comprises a jet flow channel and a fluid circulation passage in communication, the jet flow channel is built-in with a solid sample, and the fluid circulation passage is in communication with a multi-channel liquid injector for injecting jet fluid;

[0006] The CT fast three-dimensional imaging system comprises one or more groups of CT imaging components (single-path or multi-path imaging) arranged around the jet flow channel, each group of CT imaging components comprising an X-ray source and a high-frequency radiation detector arranged symmetrically about the center of the jet flow channel.

[0007] Preferably, the jet flow channel is composed of a channel shell and a jet base, and the top end and the bottom end of the jet flow channel are provided with detachable porous plates, and the top end and the bottom end of the jet flow channel are communicated with the fluid circulation passage through the porous plates, and the fluid circulation passage is sequentially provided with a first flow rate sensor, a flow control valve, a multi-channel liquid filler, a circulating pump and a second flow rate sensor.

[0008] Preferably, the top end and the bottom end of the jet flow channel are also provided with temperature control components, and the temperature control components comprise a temperature changing element and a temperature sensor arranged around the top end or the bottom end of the jet flow channel, the temperature sensor is electrically connected with the input end of a temperature controller, and the output end of the temperature controller is electrically connected with the temperature changing element.

[0009] Preferably, when the solid sample is a single-size and regular-shaped object, the CT fast three-dimensional imaging system is single-path imaging composed of one group of CT imaging components, otherwise the CT fast three-dimensional imaging system is multi-path imaging composed of multiple groups of CT imaging components.

[0010] Preferably, the ratio of the diameter to the length of the jet flow channel is 1:10.

[0011] Preferably, the channel shell and the jet base are made of PMMA material.

[0012] Preferably, the flow boundary condition of the channel shell is set as a smooth boundary, an irregular boundary or a porous medium.

[0013] The test method of the multi-field control jet test device suitable for CT fast three-dimensional imaging comprises the following steps:

[0014] S1, selecting the flow boundary condition of the channel shell and the type of the porous plate;

[0015] S2, assembling the multi-field control jet test device: installing the porous plate at the bottom end of the jet flow channel, placing the solid sample in the jet flow channel, then installing the porous plate at the top end of the jet flow channel, and then fixing the selected channel shell on the jet base by using bolts, and installing the fluid circulation passage at both ends of the jet flow channel;

[0016] S3, determining the group number of the CT imaging components according to the size and shape of the solid sample, and arranging the determined group number of CT imaging components around the jet flow channel;

[0017] S4, open the multi-channel liquid filler, inject the jet flow fluid into the fluid circulation channel and the jet channel until the jet flow fluid fills the fluid circulation channel and the jet channel, and close the multi-channel liquid filler;

[0018] S5, open the circulation pump and adjust the flow control valve to control the jet flow fluid to set the flow rate to circulate in the fluid circulation channel and the jet channel;

[0019] S6, open the temperature controller, gradually increase the current of the temperature changing element until the temperature sensor collects that the jet channel reaches the set temperature, and keep the current;

[0020] S7, open the X-ray source and the high-frequency radiation detector, the X-ray beam emitted by the X-ray source is attenuated after passing through the solid sample and the jet flow fluid in the jet channel, the attenuated photoelectric signal is received by the high-frequency radiation detector and converted into a digital signal, and the CT gray scale projection image is reconstructed by the computer to present each phase material in the form of different gray scale values, and the dynamic three-dimensional image of the flow-solid two-phase jet test under the multi-field control condition is obtained;

[0021] S8, change the flow boundary condition of the channel shell or the type of the porous plate, repeat steps S1-S7 to obtain the dynamic three-dimensional image of the flow-solid two-phase jet test under the multi-field control condition under multiple conditions.

[0022] Preferably, the flow boundary condition in step S1 is a smooth boundary, an irregular boundary or a porous medium.

[0023] Therefore, the multi-field control jet test device and method suitable for CT fast three-dimensional imaging have the beneficial effects that:

[0024] 1. Accurate multiphase flow monitoring: real-time three-dimensional imaging: through the integrated CT fast three-dimensional imaging system, the interaction between the solid sample and the jet flow fluid can be imaged in high resolution and non-invasively in real time during the experiment, which enables researchers to visually observe the changes in the internal structure and more accurately analyze the flow phenomenon, thereby improving the overall accuracy of the test;

[0025] Dynamic reconstruction algorithm: using the image reconstruction algorithm to process the obtained CT gray scale projection image to generate a clear dynamic three-dimensional image of the flow-solid two-phase jet test under the multi-field control condition, which helps to deeply understand the complex physical process;

[0026] 2. Flexible and controllable experimental conditions: multiple flow boundary conditions: the flow boundary of the channel shell can be set as a smooth boundary, an irregular boundary or various porous media, simulating different engineering application scenarios, and this flexibility allows researchers to explore the behavior characteristics of materials under various boundary conditions;

[0027] Precise temperature and flow control: By adding temperature field control and flow boundary control, the device can achieve multi-condition coupling research of fluid temperature, jet flow rate, and flow boundary, meeting various and comprehensive test requirements;

[0028] 3. Efficient data acquisition and processing: High automation: from test condition setting and execution to data acquisition and final three-dimensional image reconstruction, the entire process is almost fully automated, improving work efficiency and reducing human error;

[0029] Fast feedback mechanism: The combination of high-frequency radiation detector and CT fast three-dimensional imaging technology ensures real-time projection imaging of the entire dynamic test process;

[0030] 4. Wide application range: Cross-disciplinary research support: The device is suitable for multiple fields, including but not limited to material science, chemical engineering, energy, etc., such as simulating the internal conditions of oil wells in oil extraction, studying the dynamic process in engine combustion chambers in aerospace, or analyzing the hemodynamic characteristics in blood vessels in biomedical engineering;

[0031] Optimization design tool: By studying the behavior of materials under different conditions, engineers can improve existing product designs and develop new materials and processes with better performance;

[0032] 5. System integration design: Compact and modular: The combination of multi-field control jet flow test equipment and CT fast three-dimensional imaging system forms a complete test platform, which not only saves space but also facilitates transportation, maintenance, and function expansion;

[0033] Easy to assemble and disassemble: Key components such as multi-hole plates and jet flow channels are connected in a detachable manner, making it easy to replace and clean, extending the service life of the device;

[0034] In summary, the multi-field control jet flow test device suitable for CT fast three-dimensional imaging combines advanced imaging technology and precise control systems, providing a powerful tool for studying complex multiphase flow phenomena. It not only has high precision and flexibility but also has a wide range of applications, which is of great significance for promoting scientific research in related fields.

[0035] The technical solutions of the present application will be further described in detail below with the help of drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 For the present application, when the solid sample is single in size and regular in shape, a layout of a multi-field control jet flow test device suitable for CT fast three-dimensional imaging;

[0037] Figure 2 A layout of a multi-field controlled jet test device suitable for CT fast three-dimensional imaging of a solid sample with non-uniform size and irregular shape according to the present application;

[0038] Figure 3 A multi-field controlled jet test device structure diagram of a multi-field controlled jet test device suitable for CT fast three-dimensional imaging according to the present application.

[0039] Reference numerals

[0040] 1, solid sample; 2, multi-field controlled jet test device; 21, channel housing; 22, jet channel; 23, temperature changing element; 24, jet base; 25, bolt; 26, temperature controller; 27, fluid circulation passage; 28, multi-well plate; 29, first flow rate sensor; 210, flow control valve; 211, multi-channel liquid filler; 212, circulation pump; 213, second flow rate sensor; 3, X-ray source; 4, high-frequency ray detector. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application are further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present application and not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout.

[0042] It should be noted that the terms "comprising" and "having" and any variations thereof are intended to cover not exclusive inclusion, for example, a process, method, system, product or server including a series of steps or units, not necessarily limited to those clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0043] The embodiments of the present application are described in detail below in combination with the drawings.

[0044] As Figures 1-3As shown, a multi-field controlled fluidics test device suitable for CT fast three-dimensional imaging includes a multi-field controlled fluidics test device 2 and a CT fast three-dimensional imaging system, wherein the multi-field controlled fluidics test device 2 includes a fluidics channel 22 and a fluid circulation passage 27, the fluidics channel 22 is built-in with a solid sample 1, and the fluid circulation passage 27 is communicated with a multi-channel liquid injector 211 for injecting fluidics fluid; the CT fast three-dimensional imaging system includes one or more groups of CT imaging assemblies (single-path or multi-path imaging) arranged around the fluidics channel 22, and each group of CT imaging assemblies includes an X-ray source 3 and a high-frequency radiation detector 4 arranged symmetrically about the center of the fluidics channel 22.

[0045] The fluidics channel 22 is composed of a channel shell 21 and a fluidics base 24, and the top end and the bottom end of the fluidics channel 22 are provided with detachable porous plates 28, so as to facilitate replacement of the porous plates 28, and the porous plates have different types of hole numbers or hole diameters, so as to be suitable for different conditions of fluidics tests; in the embodiment, the flow boundary of the channel shell 21 is provided with a groove for assembling the porous plates 28, and the top end and the bottom end of the fluidics channel 22 are communicated with the fluid circulation passage 27 through the porous plates 28, and the fluid circulation passage 27 is sequentially provided with a first flow rate sensor 29, a flow control valve 210, the multi-channel liquid injector 211, a circulation pump 212 and a second flow rate sensor 213, wherein the first flow rate sensor 29 is used for detecting the output flow rate of the fluidics fluid, the second flow rate sensor 213 is used for detecting the return flow rate of the fluidics fluid, the flow control valve 210 is used for controlling the circulation flow rate of the fluidics fluid, and the circulation pump 212 is used for controlling the flow direction (from bottom to top or from top to bottom) of the fluidics fluid.

[0046] The top end and the bottom end of the fluidics channel 22 are also provided with temperature control assemblies, and the temperature control assemblies include a temperature change element 23 and a temperature sensor arranged around the top end or the bottom end of the fluidics channel 22, the temperature sensor is electrically connected with the input end of a temperature controller 26, and the output end of the temperature controller 26 is electrically connected with the temperature change element 23.

[0047] When the solid sample 1 is a single-size and regular-shaped object, the CT fast three-dimensional imaging system is single-path imaging composed of one group of CT imaging assemblies, otherwise the CT fast three-dimensional imaging system is multi-path imaging composed of multiple groups of CT imaging assemblies.

[0048] The ratio of the diameter to the length of the fluidics channel 22 is 1:10, which can ensure that the solid sample 1 has sufficient space to move during the fluidics process.

[0049] The channel shell 21 and the fluidics base 24 are both made of PMMA material, which has the characteristics of radiation penetration and high-temperature resistance, and is light in weight.

[0050] The flow boundary condition (fluid boundary condition) of the channel shell 21 is set as a smooth boundary, an irregular boundary or a porous medium.

[0051] It should be noted that the above electronic components are all mature products in the market, and the embodiment only needs to connect them according to the instructions after purchasing, and does not improve them, so the circuit connection structure and principle will not be described here.

[0052] The test method of the multi-field control jet test device suitable for CT fast three-dimensional imaging includes the following steps:

[0053] S1, selecting the flow boundary condition of the channel shell 21 and the type of the porous plate 28;

[0054] The flow boundary condition described in step S1 is a smooth boundary, an irregular boundary, or a porous medium.

[0055] S2, assembling the multi-field control jet test device: installing the porous plate 28 at the bottom end of the jet channel 22, placing the solid sample 1 inside the jet channel 22, then installing the porous plate 28 at the top end of the jet channel 22, and then fixing the selected channel shell 21 to the jet base 24 with the bolt 25, and installing the fluid circulation passage 27 at both ends of the jet channel 22;

[0056] S3, determining the number of CT imaging assemblies according to the size and shape of the solid sample 1, and arranging the determined number of CT imaging assemblies around the jet channel 22;

[0057] S4, opening the multi-channel liquid filler 211, injecting jet fluid into the fluid circulation passage 27 and the jet channel 22 until the jet fluid fills the fluid circulation passage 27 and the jet channel 22, and closing the multi-channel liquid filler 211;

[0058] S5, opening the circulating 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;

[0059] S6, opening the temperature controller 26, gradually increasing the current of the temperature changing element 23, until the temperature sensor collects that the jet channel 22 reaches the set temperature, and maintains the current;

[0060] S7, opening the X-ray source 3 and the high-frequency radiation detector 4, the radiation beam emitted by the X-ray source 3 is attenuated after passing through the solid sample 1 and the jet fluid in the jet channel 22, the attenuated photoelectric signal is received by the high-frequency radiation detector 4 and converted into a digital signal, and the CT gray scale projection image is reconstructed by the computer, each phase material is presented in the form of different gray scale values, and the dynamic three-dimensional image of the flow-solid two-phase jet test under the multi-field control condition is obtained;

[0061] It should be noted that when the solid sample is a single size regular shaped object, such asFigure 1 The single light path imaging and the multi-light path imaging shown above can be used. Figure 2 When the solid sample is a non-homogeneous irregularly shaped object, only the multi-light path imaging shown above can be used. Figure 2

[0062] S8, change the flow boundary condition of the channel shell 21 or the type of the multi-well plate 28, repeat steps S1-S7 to obtain dynamic three-dimensional images of the flow-solid two-phase jet experiment under multi-condition and multi-field control conditions.

[0063] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can still be modified or replaced by equivalents, and these modifications or replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.​

Claims

1. A multi-field controlled jet testing device suitable for rapid CT three-dimensional imaging, characterized in that: The system includes a multi-field controlled jet testing device and a rapid CT three-dimensional imaging system. The multi-field controlled jet testing device includes a connected jet channel and a fluid circulation path. The jet channel contains a solid sample, and the fluid circulation path is connected to a multi-channel liquid injector for injecting the jet fluid. The rapid CT three-dimensional imaging system includes one or more sets of CT imaging components arranged around the jet channel, corresponding to single-path imaging and multi-path imaging, respectively. Each set of CT imaging components includes an X-ray source and a high-frequency X-ray detector arranged symmetrically about the center of the jet channel. The jet channel consists of a channel shell and a jet base. The top and bottom of the jet channel are equipped with detachable perforated plates. The top and bottom of the jet channel are connected to the fluid circulation passage through the perforated plates. The fluid circulation passage is sequentially equipped with a first flow rate sensor, a flow control valve, a multi-channel liquid injector, a circulation pump, and a second flow rate sensor. Temperature control components are also provided at the top and bottom of the jet channel. The temperature control components 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 terminal of the temperature controller, and the output terminal of the temperature controller is electrically connected to the temperature variable element. When the solid sample is a single-size and regularly shaped object, the CT rapid three-dimensional imaging system consists of a single-beam imaging system consisting of a set of CT imaging components; otherwise, the CT rapid three-dimensional imaging system consists of a multi-beam imaging system consisting of multiple sets of CT imaging components.

2. The multi-field controlled jet testing device for rapid CT three-dimensional imaging according to claim 1, characterized in that: The ratio of the diameter to the length of the jet channel is 1:

10.

3. The multi-field controlled jet testing device for rapid CT three-dimensional imaging according to claim 1, characterized in that: Both the channel housing and the jet base are made of PMMA material.

4. The multi-field controlled jet testing device for rapid CT three-dimensional imaging according to claim 1, characterized in that: The flow boundary conditions of the channel shell are set as a smooth interface, an irregular interface, or a porous interface.

5. The test method for the multi-field controlled jet test device applicable to rapid CT three-dimensional imaging according to any one of claims 1-4, characterized in that: Includes the following steps: S1. Select the flow boundary conditions of the channel shell and the type of perforated plate; S2. Assemble the multi-field controlled jet test equipment: Install a perforated plate at the bottom of the jet channel, place the solid sample inside the jet channel, install a perforated plate at the top of the jet channel, and then use bolts to fix the selected channel shell to the jet base. Install fluid circulation paths at both ends of the jet channel. S3. Determine the number of CT imaging modules based on the size and shape of the solid sample, and arrange the determined number of CT imaging modules around the jet channel. S4. Open the multi-channel liquid dispenser and inject fluid into the fluid circulation passage and jet passage until they are full. Then close the multi-channel liquid dispenser. S5. Turn on the circulation pump and adjust the flow control valve to control the jet fluid to set the flow rate and circulate it in the fluid circulation path and jet channel; S6. Turn on the thermostat and gradually increase the current of the variable temperature 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. Turn on the X-ray source and high-frequency radiation detector. The X-ray beam emitted by the X-ray source is attenuated after passing through the solid sample and jet fluid in the jet channel. The attenuated photoelectric signal is received by the high-frequency radiation detector and converted into a digital signal. The computer reconstructs the CT grayscale projection image and presents each phase material in the form of different grayscale values, thus obtaining a dynamic three-dimensional image of the fluid-solid two-phase jet test under multi-field control conditions. S8. Change the flow boundary conditions of the channel shell or the type of porous plate, and repeat steps S1-S7 to obtain dynamic three-dimensional images of the fluid-solid two-phase jet test under multi-field control conditions.

6. The test method for the multi-field controlled jet test device applicable to rapid CT three-dimensional imaging as described in claim 5, 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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