Real-time visual measurement device and method for vorticity field of single fracture surface of rock

Abstract

The invention discloses a rock single fissure surface vorticity field real-time visual measurement device and method.The rock single fissure surface vorticity field real-time visual measurement device comprises a transparent rock fissure surface seepage experiment cavity, a visual observation system, a liquid injection system and a data acquisition system, the liquid injection system can inject seepage liquid into a fissure seepage channel, tracer particles are evenly dispersed in the seepage liquid, and the data acquisition system is connected with the visual observation system; the visual observation system can provide an excitation light source for the bottom of the rock fracture surface seepage experiment cavity, observe the flow state of tracer particles in real time above the rock fracture surface seepage experiment cavity and generate a particle migration image; the data acquisition system can acquire and process particle migration images and acquire vorticity field distribution in a fracture seepage channel in real time, so that the real-time dynamic change of vorticity on a rock fracture surface is measured, and the seepage state and dynamic change of rock fractures are intuitively and accurately represented.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering technology, specifically to the measurement of eddy field on rock fracture surfaces. Background Technology

[0002] Rock fissure seepage refers to the flow of fluid in rock fissures. The fissure structure of the rock can significantly affect the fluid seepage, resulting in water inrush. A large amount of fluid suddenly rushes into the mine shaft, causing geological hazards or mine accidents.

[0003] To clearly observe the seepage state of fluid within rock fissures, Chinese patent application CN 112903557 A discloses a visualization measurement device and method for flow velocity and flow field during seepage in rock fissures. The device includes a transparent fissure rock mass, a rock mass clamping assembly, a seepage assembly, and an observation assembly. The transparent fissure rock mass is made of transparent material. The rock mass clamping assembly is used to clamp the transparent fissure rock mass. The seepage assembly is used to fill the fissures with an inorganic salt solution containing fluorescent particles. The observation assembly includes a light source and a high-speed camera. The transparent fissure rock mass realistically and completely depicts the true morphology of the natural fissure rock mass structure, allowing for the study of the flow velocity and flow field distribution of fluid within the fissure rock mass.

[0004] However, due to the complex structure of rock fracture surfaces, the flow velocity and flow field distribution of fluid in rock fractures cannot be directly and accurately characterized as the seepage state and dynamic changes of rock fractures. Turbulence, backflow or local eddies in rock fractures can significantly affect the flow and transmission of fluids.

[0005] Therefore, it is crucial to effectively monitor the seepage state of rock fissures continuously and in real time, measure the real-time dynamic changes of eddy current on the rock fissure surface, and thus predict changes in rock fissure permeability or potential blockage problems. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a real-time visualization measurement device and method for the eddy field of a single rock fracture surface, which continuously and in real time observes the seepage state of rock fractures, thereby measuring the real-time dynamic changes of eddy field on the rock fracture surface.

[0007] To achieve the above objectives, the present invention provides a real-time visualization measurement device for the eddy field of a single rock fracture surface, comprising a transparent rock fracture surface seepage experimental chamber, a visualization observation system, and a liquid injection system. The rock fracture surface seepage experimental chamber is provided with a horizontally oriented fracture seepage channel. The device also includes a data acquisition system. The liquid injection system is configured to inject seepage fluid into the fracture seepage channels, the seepage fluid containing tracer particles uniformly dispersed. The visualization observation system is configured to provide an excitation light source to the bottom of the rock fracture surface seepage experimental chamber, and to observe the flow state of the tracer particles in real time above the rock fracture surface seepage experimental chamber, generating particle transport images. The data acquisition system is configured to acquire in real time the pressure values ​​on both sides of the fracture seepage channel, the weight of the remaining seepage fluid after flowing through the fracture seepage channel, and receive and process the particle transport image to obtain the eddy field distribution in the fracture seepage channel in real time.

[0008] Furthermore, the rock fracture surface seepage experimental chamber is configured to adjust the opening of the fracture seepage channel, and an inlet trough and an outlet trough are respectively provided on both sides of the fracture seepage channel.

[0009] Furthermore, the liquid injection system includes an air compressor pump and a sealed container for containing the seepage liquid, the air compressor pump being connected to the sealed container via a pressure reducing valve.

[0010] Furthermore, the sealed container is equipped with a flow meter, which is connected to the inlet tank of the fissure seepage channel.

[0011] Furthermore, the data acquisition system includes a pressure gauge connected to the inlet tank and the outlet tank, a liquid collection container connected to the outlet tank, and an electronic balance disposed at the bottom of the liquid collection container.

[0012] Furthermore, the tracer particles are composed of fluorescent particles.

[0013] Furthermore, the fluorescent particles are orange-red polystyrene fluorescent microspheres with a particle size of 5-10 μm, a laser spectral wavelength of 310-540 nm, and a spectral spectral length of 590-670 nm.

[0014] Furthermore, the excitation source is a blue-violet laser, the maximum power of which is 5W and the wavelength is 465nm.

[0015] Furthermore, the excitation source also includes an auxiliary light source, which is a blue-violet LED light source. The blue-violet LED light source has the same wavelength as the blue-violet laser, but its power is lower than that of the blue-violet laser.

[0016] To achieve the above objectives, the present invention provides a real-time visualization measurement method for the vorticity field of a single rock fracture surface, based on the aforementioned real-time visualization measurement device for the vorticity field of a single rock fracture surface. The measurement method includes: The visualization observation system has an excitation light source at the bottom of the rock fracture surface seepage experimental chamber, and a high-speed camera and a high-pass filter above the rock fracture surface seepage experimental chamber. The liquid injection system injects seepage fluid into the fracture seepage channel, and tracer particles are uniformly dispersed in the seepage fluid. The visualization observation system uses a high-speed camera to observe the flow state of the tracer particles in real time and generates particle transport images. The data acquisition system collects the pressure values ​​on both sides of the fracture seepage channel in real time and receives the particle transport images. The data is then processed using particle image velocimetry technology to obtain the eddy field distribution in the fracture seepage channel.

[0017] The present invention provides a real-time visualization measurement device and method for the eddy field of a single rock fracture surface. The visualization observation system observes the flow state of tracer particles in real time and generates particle migration images, thereby enabling real-time observation of the seepage state of rock fractures. Simultaneously, the data acquisition system receives and processes the particle migration images to obtain the eddy field distribution in the fracture seepage channel in real time, thereby measuring the real-time dynamic changes of eddy on the rock fracture surface. This allows for an intuitive and accurate characterization of the seepage state and dynamic changes of rock fractures. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 A schematic diagram of the overall structure of the real-time visualization measurement device for the eddy field of a single fracture surface in rock provided by the present invention. Figure 2 This is a front view schematic diagram of the rock fracture surface seepage experimental chamber in this invention; Figure 3 This is a top view schematic diagram of the rock fracture surface seepage experimental chamber in this invention; Figure 4 These are the physical parameters of the tracer particles in this invention; Figure 5 This is a schematic diagram of the excitation and emission spectra of the tracer particles in this invention.

[0020] Figure label: 100. Test chamber for seepage at rock fissure surface; 110. Seepage channel at fissure; 111. Upper transparent rock; 112. Lower transparent rock; 113. Inlet tank; 114. Outlet tank; 120. Rock mass clamping assembly; 121. U-shaped base plate; 122. Outer side plate; 123. Inner side plate; 124. Sealing element; 125. Gap adjustment plate; 126. Pad block; 200. Liquid injection system; 210. Air compressor pump; 220. Sealed container; 221. Flow meter; 230. Pressure reducing valve; 300. Visual observation system; 310. High-speed camera; 320. High-pass filter; 330. Excitation source; 400. Data acquisition system; 410. Pressure gauge; 420. Liquid collection container; 430. Electronic balance. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0022] See Figure 1 The image shows an example of a real-time visualization measurement device for the vorticity field of a single fracture surface in rock provided by the present invention.

[0023] As shown in the figure, the real-time visualization measurement device for the eddy field of a single rock fracture surface in this example includes a transparent rock fracture surface seepage experimental chamber 100, a liquid injection system 200, a visualization observation system 300, and a data acquisition system 400.

[0024] The rock fracture surface seepage experimental chamber 100 is equipped with a horizontally oriented fracture seepage channel 110; the liquid injection system 200 is configured to inject seepage fluid into the fracture seepage channel 110, in which tracer particles are uniformly dispersed; the visualization observation system 300 is configured to provide an excitation light source 330 to the bottom of the rock fracture surface seepage experimental chamber 100, and to observe the flow state of the tracer particles in real time above the rock fracture surface seepage experimental chamber 100, generating a particle transport image; the data acquisition system 400 is configured to collect the pressure values ​​on both sides of the fracture seepage channel 110 and the weight of the remaining seepage fluid after flowing through the fracture seepage channel 110 in real time, and to process the data in conjunction with the particle transport image to obtain the eddy field distribution in the fracture seepage channel 110, thereby continuously and in real time observing the seepage state of the rock fracture and measuring the real-time dynamic changes of eddy on the rock fracture surface.

[0025] Combination Figure 2 and Figure 3 The rock fracture surface seepage test chamber 100 includes an upper transparent rock 111 and a lower transparent rock 112 located below the upper transparent rock 111. The opposite sides of the upper transparent rock 111 and the lower transparent rock 112 are rough fracture surfaces, so that the upper transparent rock 111 and the lower transparent rock 112 enclose and form a crack, thereby constituting the fracture seepage channel 110 in the rock fracture surface seepage test chamber 100.

[0026] Furthermore, the upper transparent rock 111 and the lower transparent rock 112 are preferably made of transparent resin or epoxy resin, which facilitates the observation of the flow state of the seepage fluid in the fracture seepage channel 110, making the seepage state of the rock fracture visible, thereby enabling real-time measurement of the eddy field distribution on the fracture seepage channel 110.

[0027] Furthermore, the rock fissure surface seepage test chamber 100 is configured to adjust the opening of the fissure seepage channel 110. Specifically, the height of the upper transparent rock 111 can be adjusted, and by adjusting the height of the upper transparent rock 111, the opening of the fissure seepage channel 110 can be adjusted.

[0028] In order to achieve stable coordination and adjustment between the upper transparent rock 111 and the lower transparent rock 112, the rock fracture surface seepage test chamber 100 also includes a rock mass clamping assembly 120.

[0029] Specifically, the rock mass clamping assembly 120 includes an inner frame and an outer frame. The outer frame is formed by connecting a U-shaped base plate 121 and four outer side plates 122. The inner frame is located inside the outer frame and is formed by enclosing four inner side plates 123. The bottom of each of the four inner side plates 123 is preferably placed on the top surface of the U-shaped base plate 121, so that the inner frame and the outer frame cooperate to form a cavity that can accommodate the upper transparent rock 111 and the lower transparent rock 112.

[0030] Furthermore, the inner sides of the four inner side plates 123 are preferably provided with grooves for installing the seal 124, so that the seal 124 is fitted around the outer periphery of the fissure seepage channel 110 to seal the fissure seepage channel 110.

[0031] Here, the seal 124 is preferably in the shape of a square, and water grooves are provided on the two opposite sides of the seal 124, so that water inlet groove 113 and water outlet groove 114 are respectively provided on both sides of the fissure seepage channel 110, which can realize the entry and exit of seepage liquid.

[0032] In order to adjust the opening of the fissure seepage channel 110, a gap adjustment plate 125 and a pad 126 are provided on the outer periphery of the top of the upper transparent rock 111. The gap adjustment plate 125 is preferably U-shaped. Several limiting bolts are inserted on the front and rear sides of the gap adjustment plate 125 respectively. The bottom end of each limiting bolt passes through the gap adjustment plate 125 and is threadedly connected to the inner or outer frame.

[0033] Furthermore, the pad 126 is preferably filled between the upper transparent rock 111 and the left and right sides of the gap adjustment plate 125, and the pad 126, the gap adjustment plate 125 and the upper transparent rock 111 are formed into a whole by tightening bolts. The fit height between the upper transparent rock 111 and the lower transparent rock 112 can be adjusted by the gap adjustment plate 125 and the pad 126, thereby adjusting the opening of the fissure seepage channel 110.

[0034] The rock fracture surface seepage experimental chamber 100 thus constructed can intuitively display the flow state of the seepage fluid in the fracture seepage channel 110, so as to facilitate real-time measurement of the eddy field distribution on the fracture seepage channel 110.

[0035] Combination Figure 1The liquid injection system 200, which is compatible with the rock fracture surface seepage test chamber 100, includes an air compressor pump 210 and a sealed container 220 for containing seepage liquid. The air compressor pump 210 is connected to the sealed container 220 through a pressure reducing valve 230.

[0036] Furthermore, a flow meter 221 is provided in the sealed container 220, and the flow meter 221 is connected to the inlet tank 113 of the fissure seepage channel 110.

[0037] In this way, the air compressor pump 210 can provide high-pressure air to the sealed container 220, and the pressure reducing valve 230 ensures that the air compressor pump 210 applies a stable pressure to the seepage fluid, so that the seepage fluid in the sealed container 220 can be stably and continuously transferred to the fracture seepage channel 110. At the same time, the flow meter 221 measures the flow rate of the seepage fluid flowing into the fracture seepage channel 110 to ensure that the seepage fluid has the pressure and flow rate required for the rock fracture seepage experiment.

[0038] Preferably, in this example, the seepage fluid is composed of water. In order to facilitate the observation of the flow state of the seepage fluid, tracer particles are uniformly dispersed in the seepage fluid. The relative density, particle size and refractive index of the tracer particles and the seepage fluid will affect the observation results.

[0039] Specifically, the particle size of the tracer particles should be small to avoid the tracer particles settling or floating and accumulating on the rough surfaces of the fracture seepage channel 110, which would cause the phenomenon of high light overflow and ultimately affect the quality of the images acquired by the visualization observation system 300.

[0040] Meanwhile, when the seepage fluid generates turbulence, the physical size range corresponding to the smallest vortex size is 30~50μm. Therefore, the particle size of the tracer particles should be as small as possible to ensure that the tracer particles can effectively indicate the motion state of the seepage fluid. However, if the particle size of the tracer particles is too small, it will affect the observation quality.

[0041] Correspondingly, when the concentration of tracer particles in the permeate is high, the light intensity of the permeate will also increase. In other words, tracer particles with a higher refractive index have better scattering properties. Since the scattering property of tracer particles increases with the increase of particle size, while the following property of particles decreases with the increase of particle size, the particle size of tracer particles is configured to be 5-10 μm after comprehensive consideration.

[0042] Furthermore, when the tracer particles accelerate along with the seepage fluid, the density difference between the seepage fluid and the tracer particles will cause a lag effect in the velocity of the tracer particles. When the density of the tracer particles and the fluid are equal, the motion lag effect can be ignored.

[0043] Therefore, in this example, the tracer particles are composed of fluorescent particles, preferably produced by Tianjin Bestray Pharmaceutical Co., Ltd. with a density of 1.064 kg / m³.3 The tracer particles are composed of orange-red polystyrene fluorescent microspheres, which makes the density of the tracer particles close to that of the seepage fluid. This allows the tracer particles to follow the seepage fluid better during the seepage process, thereby improving the observation effect.

[0044] The physical parameters of the tracer particles are as follows: Figure 4 and Figure 5 As shown, the laser spectrum wavelength is 310-540nm, and the emission spectrum spectrum is 590-670nm. The maximum excitation wavelength is 465nm, and the maximum emission wavelength is 630nm, to ensure that the tracer particles have good imaging visibility and to ensure the observation quality of the seepage fluid.

[0045] In order to observe the seepage fluid, the visualization observation system 300 is configured to provide an excitation light source 330 to the bottom of the rock fracture surface seepage experimental chamber 100 to excite tracer particles in the seepage fluid.

[0046] Corresponding to the tracer particles in this example, the excitation source 330 is composed of a blue-violet laser provided by Oriental Fluid Measurement Technology (Beijing) Co., Ltd., and the wavelength of the blue-violet laser should be smaller than that of the tracer particles. Therefore, the maximum power of the blue-violet laser is 5W and the wavelength is 465nm.

[0047] Furthermore, the excitation light source 330 also includes an auxiliary light source, which is preferably composed of three blue-violet LED light sources, and the blue-violet LED light sources have the same wavelength as the blue-violet laser, but lower power than the blue-violet laser.

[0048] In this way, the high-power blue-violet laser can excite the fluorescence of the particles, while the blue-violet LED light source can increase the light source range of the blue-violet laser. This allows the blue-violet laser and the blue-violet LED light source to work together to provide an excitation source 330 for the tracer particles at the bottom of the rock fissure surface seepage experimental chamber 100, thereby exciting all the tracer particles in the rock fissure surface seepage experimental chamber 100, resulting in a higher contrast image for the tracer particles and improving the observation quality.

[0049] Combination Figure 1 Furthermore, the visualization observation system 300 includes a high-speed camera 310 installed above the seepage experimental chamber 100 on the rock fracture surface. The high-speed camera 310 observes the flow state of the tracer particles in real time, thereby generating particle transport images and providing data support for subsequent eddy field distribution measurements.

[0050] In addition, the visualization observation system 300 also includes a high-pass filter 320 placed in front of the lens of the high-speed camera 310 to reduce the influence of natural light sources, thereby improving the quality of particle transport images acquired by the high-speed camera 310.

[0051] Since the wavelength of the tracer particles in this example is 590-670nm and the maximum wavelength of the blue-violet laser is 465nm, preferably, the wavelength of the high-pass filter 320 is 560nm. This allows the high-pass filter 320 to block light with wavelengths above 560nm while allowing light with wavelengths above 560nm to pass through smoothly. Finally, the filtered light is projected onto the photosensitive element of the high-speed camera 310, thereby improving the quality of the particle transport image and ensuring the accuracy of the eddy field distribution results.

[0052] In order to obtain the eddy field distribution results on the fracture seepage channel 110 through particle transport images, this measuring device also includes a data acquisition system 400.

[0053] Combination Figure 1 Specifically, the data acquisition system 400 includes a pressure gauge 410 connecting the inlet tank 113 and the outlet tank 114 of the fissure seepage channel 110 to detect the pressure values ​​on both sides of the fissure seepage channel 110 in real time, ensuring that the seepage fluid in the fissure seepage channel 110 has a stable pressure and improving the accuracy of experimental results.

[0054] Furthermore, the data acquisition system 400 also includes a liquid collection container 420 connected to the water outlet tank 114, and an electronic balance 430 set at the bottom of the liquid collection container 420, so that the liquid collection container 420 can collect the remaining seepage liquid flowing out of the fissure seepage channel 110, and at the same time, the electronic balance 430 collects the weight of the remaining seepage liquid in real time, which facilitates the recycling of the remaining seepage liquid.

[0055] Furthermore, the data acquisition system 400 receives particle transport images acquired by the visualization observation system 300 in real time, and processes the particle transport images to obtain the eddy field distribution in the fracture seepage channel 110.

[0056] As an example, the data acquisition system 400 imports particle transport images into particle image velocimetry software for analysis. The particle image velocimetry software uses particle image velocimetry technology to calculate the velocity vector information of the tracer particles based on the displacement values ​​of tracer particles in several adjacent frames of images. It then converts the velocity vector information into real-time eddy field distribution characteristics, thereby intuitively and accurately reflecting the flow state of the seepage fluid.

[0057] This constitutes the real-time visualization measurement device for the vorticity field of a single fracture surface in rock provided by the present invention.

[0058] This invention also provides a real-time visualization measurement method for the vorticity field of a single fracture surface in rock. Based on the real-time visualization measurement device for the vorticity field of a single fracture surface in rock constructed by the above scheme, this measurement method includes: The visualization observation system 300 sets an excitation light source 330 at the bottom of the rock fracture surface seepage experimental chamber 100, and sets a high-speed camera 310 and a high-pass filter 320 above the rock fracture surface seepage experimental chamber 100.

[0059] Next, the liquid injection system 220 injects seepage fluid into the fracture seepage channel 110, and tracer particles are uniformly dispersed in the seepage fluid.

[0060] Thus, the visualization observation system 300 observes the flow state of the tracer particles in real time through the high-speed camera 310 and generates particle transport images.

[0061] Meanwhile, the data acquisition system 400 collects the pressure values ​​on both sides of the fracture seepage channel 100 in real time, the weight of the remaining seepage fluid after flowing through the fracture seepage channel, and receives particle transport images. The images are then processed using particle image velocimetry technology to obtain the eddy field distribution in the fracture seepage channel.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A rock single fracture plane vorticity field real-time visualization measuring device, comprising a transparent rock fracture plane seepage experiment cavity, a visualization observation system and a liquid injection system, a fracture seepage channel in the horizontal direction is arranged in the rock fracture plane seepage experiment cavity, characterized in that, The data acquisition system is further included, The liquid injection system is configured to inject seepage fluid into the fracture seepage channel, the seepage fluid uniformly dispersing the tracer particles, The visualization observation system is configured to provide an excitation light source at the bottom of the rock fracture plane seepage experiment chamber and to observe the flow state of the tracer particles in real time above the rock fracture plane seepage experiment chamber to generate a particle migration image, The data acquisition system is configured to acquire the pressure values on both sides of the fracture seepage channel, the weight of the remaining seepage fluid after flowing through the fracture seepage channel, and the particle migration image for processing to obtain the vorticity field distribution in the fracture seepage channel in real time.

2. The device for real-time visualization and measurement of vorticity field of rock single fracture plane according to claim 1, characterized in that, The rock fracture plane seepage experiment chamber is configured to adjust the opening of the fracture seepage channel, and the fracture seepage channel is respectively provided with a water inlet groove and a water outlet groove on both sides.

3. The device for real-time visualization and measurement of vorticity field of rock single fracture plane according to claim 2, characterized in that, The liquid injection system includes an air compression pump and a sealed container for containing the seepage fluid, and the air compression pump is connected to the sealed container through a pressure reducing valve.

4. The device for real-time visualization and measurement of vorticity field of rock single fracture plane according to claim 3, characterized in that, The sealed container is provided with a flow meter connected to the water inlet groove of the fracture seepage channel.

5. The device for real-time visualization and measurement of vorticity field of rock single fracture plane according to claim 2, characterized in that, The data acquisition system includes a pressure gauge connected to the water inlet groove and the water outlet groove, a liquid collecting container connected to the water outlet groove, and an electronic balance arranged at the bottom of the liquid collecting container.

6. The device for real-time visualization and measurement of vorticity field of rock single fracture plane according to claim 1, characterized in that, The tracer particles are composed of fluorescent particles.

7. The device for real-time visualization and measurement of vorticity field of rock single fracture plane according to claim 6, characterized in that, The fluorescent particles are orange-red polystyrene fluorescent microspheres, the particle size of the fluorescent particles is 5-10 μm, the laser spectrum wavelength is 310-540 nm, and the luminescence spectrum wavelength is 590-670 nm.

8. The device for real-time visualization and measurement of vorticity field of rock single fracture plane according to claim 7, characterized in that, The excitation light source is a blue-violet laser, and the maximum power of the blue-violet laser is 5 W and the wavelength is 465 nm.

9. The device for real-time visualization and measurement of vorticity field of rock single fracture plane according to claim 8, characterized in that, The excitation light source further includes an auxiliary light source, which is a blue-violet LED light source, and the wavelength of the blue-violet LED light source is the same as that of the blue-violet laser, and the power is lower than that of the blue-violet laser.

10. A method for real-time visualization measurement of a rock single fracture plane vorticity field, characterized in that, The rock single fracture plane vorticity field real-time visualization measurement device based on any one of claims 1 to 9, the measurement method comprising: The visualization observation system is provided with an excitation light source at the bottom of the rock fracture plane seepage experiment chamber and is provided with a high-speed camera and a high-pass filter above the rock fracture plane seepage experiment chamber, The liquid injection system injects seepage fluid into the fracture seepage channel, and the seepage fluid uniformly disperses the tracer particles, The visualization observation system observes the flow state of the tracer particles in real time through the high-speed camera and generates a particle migration image, The data acquisition system acquires the pressure values on both sides of the fracture seepage channel, the weight of the remaining seepage fluid after flowing through the fracture seepage channel, and the particle migration image, and processes the particle migration image through a particle image velocimetry technology to obtain the vorticity field distribution in the fracture seepage channel.

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