High-speed train surrounding flow field visualization and chloride ion corrosion early warning system and method

Abstract

The invention relates to the technical field of rail transit environment monitoring, and particularly provides a high-speed train surrounding flow field visualization and chloride ion corrosion early warning system and method.The system comprises a fluorescent probe emitting device, an ultraviolet excitation device, an imaging assembly, a data transmission assembly and a data fusion system; the fluorescent probe emitting devices are symmetrically arranged on the side wall of the tunnel along the radial direction of the tunnel; the ultraviolet excitation devices are distributed and arranged on the arch crown of the tunnel along the axial direction of the tunnel; the imaging assembly is arranged on the side wall of the tunnel in front of the ultraviolet excitation device in the running direction of the train; the data transmission assembly is arranged in the tunnel and is connected with the imaging assembly; and the data fusion system is connected with the data transmission assembly. Visualization of the flow field around the high-speed train is achieved based on the carbon dot fluorescent probe, the ultraviolet excitation device and the imaging assembly, data transmission and corrosion risk index calculation are achieved through the data transmission assembly and the data fusion system, and then chloride ion corrosion risk early warning is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit environment monitoring, in particular to a high-speed train surrounding flow field visualization and chloride ion corrosion early warning system and method. BACKGROUND

[0002] With the improvement of coastal high-speed rail network density, the engineering contradiction of material accelerated deterioration induced by high-salt fog environment in the sea tunnel is increasingly prominent. The dynamic distribution law of salt fog in the confined space directly restricts the effectiveness of the protection system, and this distribution is essentially dominated by the aerodynamic effect caused by train operation. When the high-speed train passes through the tunnel, it acts as a high-intensity dynamic disturbance source, inducing a double regulation effect of the unsteady flow field on the salt fog transmission: on the one hand, through the turbulent mixing action to promote the spatial diffusion of salt fog, on the other hand, to form a secondary flow at the tunnel wall to induce particle deposition. Salt fog is essentially an aerosol of seawater penetrating into the tunnel, a particle system suspended in the air, and the main component in salt fog is chloride ion. The existing monitoring means mainly uses wind speed sensors and periodic manual sampling detection, but the flow field dynamics parameters and chloride ion diffusion behavior lack synchronous monitoring capability.

[0003] Carbon dots (CDs) as a new type of fluorescent material, due to their excellent luminescent performance, good biocompatibility and low toxicity, have attracted much attention in the fields of biological imaging, sensing, drug delivery, etc. The rich oxygen / nitrogen functional groups on the surface of carbon dots tend to combine with chloride ions in the salt fog environment. This interaction forms through electrostatic attraction or hydrogen bond network, which may induce unbalance of the surface charge of the probe, thereby affecting the fluorescence resonance energy transfer (FRET) efficiency, causing fluorescence quenching or enhancement.

[0004] However, although carbon dot fluorescent probe technology performs well in biological imaging, it still faces challenges in the field of high-speed train flow field visualization and environmental monitoring. For example, how to realize the synchronous visualization monitoring of flow field vortex structure and chloride ion concentration gradient, and how to output the tunnel corrosion diagnosis parameters (corrosion risk index) synchronously to provide data support for tunnel structure health monitoring.

[0005] Therefore, it is necessary to design a high-speed train surrounding flow field visualization and chloride ion corrosion early warning system and method to solve the technical problems existing in the prior art. SUMMARY

[0006] The present application aims to provide a high-speed train surrounding flow field visualization and chloride ion corrosion early warning system and method to solve the technical problems existing in the prior art, and the specific technical solutions are as follows: The high-speed train surrounding flow field visualization and chloride ion corrosion early warning system comprises a fluorescent probe emitting device, an ultraviolet light excitation device, an imaging assembly, a data transmission assembly and a data fusion system; the fluorescent probe emitting device is symmetrically arranged on the side wall of the tunnel along the radial direction of the tunnel; the ultraviolet light excitation device is arranged on the vault of the tunnel along the axial direction of the tunnel; the imaging assembly is arranged on the side wall of the tunnel in front of the ultraviolet light excitation device along the driving direction of the train; the data transmission assembly is arranged in the tunnel and connected with the imaging assembly; and the data fusion system is connected with the data transmission assembly.

[0007] Further, the fluorescent probe emitting device comprises a carbon dot fluorescent probe storage, a constant pressure conveying pipe and an atomizing sprayer connected in sequence; the carbon dot fluorescent probe storage and the constant pressure conveying pipe are arranged on the bottom surface of the side wall of the tunnel, and the atomizing sprayer extends from the bottom surface of the side wall of the tunnel to the top surface of the side wall of the tunnel.

[0008] Further, a pneumatic pressurizing module is arranged in the carbon dot fluorescent probe storage, and a pressure sensor is arranged in the atomizing sprayer, and the pressure sensor is connected with the pneumatic pressurizing module.

[0009] Further, the imaging assembly comprises a camera, a camera support frame and an anti-fog lens; the camera is adjustably mounted on the side wall of the tunnel through the camera support frame, and the anti-fog lens is mounted at the front end of the lens of the camera.

[0010] Further, the ultraviolet light excitation device is arranged obliquely, and the included angle between the ultraviolet light excitation device and the central axis of the tunnel is 30°±5°. The ultraviolet light excitation device comprises an ultraviolet laser emitter and a laser beam expander, and the laser beam expander is connected with the ultraviolet laser emitter and used for adjusting the diameter and divergence angle of the laser beam.

[0011] Further, the data transmission assembly adopts a relay device to transmit the data acquired by the imaging assembly to a base station at the tunnel entrance, and the base station transmits the data to the data fusion system. The data fusion system comprises a data analysis and processing module and an early warning module, the data analysis and processing module is connected with the data transmission assembly, and the early warning module is connected with the data analysis and processing module.

[0012] The high-speed train surrounding flow field visualization and chloride ion corrosion early warning method comprises the following steps: Step S1, installing the fluorescent probe emitting device, the ultraviolet light excitation device and the imaging assembly on the test section of the submarine tunnel; Step S2, adjusting the position of the ultraviolet light excitation device to form a laser curtain at the whole tunnel cross section position monitored; Step S3, adjusting the imaging assembly to ensure that the camera can clearly and completely capture the high-speed train surrounding flow field; Step S4: Activate the fluorescent probe emission device to uniformly distribute the carbon dot fluorescent probes in the tunnel flow field to mark chloride ions. After refraction by the laser curtain, a moving trajectory is formed; activate the imaging component to capture the moving trajectory in real time. Step S5: The data captured by the imaging component is uploaded to the data fusion system via the data transmission component to visualize the flow field around the high-speed train; and the risk of chloride ion corrosion is warned in real time through the corrosion risk prediction model.

[0013] Furthermore, in step S5, the real-time early warning of chloride ion corrosion risk through the corrosion risk prediction model specifically involves: Step S5.1: Obtain the three-dimensional velocity vector field based on the flow field velocity vector calculation formula; obtain the chloride ion concentration based on the chloride ion concentration inversion formula; Step S5.2: Perform coupled calculations based on chloride ion concentration and three-dimensional flow velocity vector field to obtain the rate of change of chloride ion concentration over time; Step S5.3: Establish a corrosion risk prediction model based on chloride ion concentration, chloride ion concentration change rate, and three-dimensional flow velocity vector field; Step S5.4: Dynamically generate a corrosion risk index based on the corrosion risk prediction model, and provide real-time early warning of chloride ion corrosion risk based on the corrosion risk index.

[0014] Furthermore, in step S5.1, the formula for calculating the flow field velocity vector is as follows: ; In the above formula, It is a three-dimensional velocity field; It is a carbon dot fluorescent probe in x , y , z The velocity component in the direction; This is the displacement vector of the particle; for Images of fluorescent particles at time points. for Images of fluorescent particles at specific times; The chloride ion concentration inversion formula is as follows: ; In the above formula, For none Cl - Initial fluorescence intensity at time; For existence Cl - fluorescence intensity at that time; It is the quenching constant; Chloride ion concentration, Represents the turbulence-quenching coupling coefficient. The Frobenius norm represents the velocity gradient tensor; In step S5.2, the chloride ion migration-diffusion equation is as follows: ; In the above formula, C is the concentration field; is the flow velocity vector field; is the diffusion coefficient; is the aerosol source term.

[0015] Further, in step S5.3, the corrosion risk prediction model formula is as follows: ; In the above formula, R is the cumulative deposition per unit area; t 1 and 2 are the train head nose passing time and the train tail nose passing time, respectively; t is the tunnel wall surface integral domain; are the cumulative weight coefficients.

[0016] The technical scheme of the present application has the following beneficial effects: (1) The high-speed train surrounding flow field visualization and chloride ion corrosion early warning system provided by the present application realizes high-speed train surrounding flow field visualization based on carbon dot fluorescent probes, ultraviolet light excitation devices and imaging assemblies, realizes data transmission and corrosion risk index calculation through a data transmission assembly and a data fusion system, and further realizes chloride ion corrosion risk early warning.

[0017] (2) Based on the fluorescence quenching effect of the carbon dot probe and the flow field tracing characteristics, the present application directly maps the aerosol distribution into three-dimensional velocity field data, establishes a matching relationship between the chloride ion diffusion path and the flow field evolution, and synchronously outputs engineering corrosion diagnosis parameters (i.e. corrosion risk index) and fluid mechanics characteristic spectrum (high-speed train surrounding flow field visualization), which can not only provide concentration threshold early warning for tunnel structure health assessment, but also provide support for train aerodynamic shape optimization, and realizes bidirectional multiplexing of safety monitoring and basic research value.

[0018] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application, and are incorporated herein for purposes of illustrating the illustrative embodiments of the present application and the explanations provided herein, and are not intended as a proper limitation of the present application. In the drawings:​​​​​​ Figure 1 is a schematic diagram of the high-speed train surrounding flow field visualization and chloride ion corrosion early warning system in the present application; Figure 2 is a structural schematic diagram of the ultraviolet light excitation device; Figure 3 is a structural schematic diagram of the imaging assembly; Figure 4 is a schematic diagram of the data transmission assembly; Figure 5 is a flow chart of the high-speed train surrounding flow field visualization and chloride ion corrosion early warning method in the present application; 1, carbon dot fluorescent probe storage, 2, constant pressure delivery pipe, 3, atomizing sprayer, 4, camera, 5, camera support, 6, anti-fog lens, 7, ultraviolet laser emitter, 8, laser beam expander, 9, data transmission assembly. DETAILED DESCRIPTION

[0020] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered.

[0021] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0022] In addition, the terms "first", "second", and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0023] Embodiment: Referring to Figure 1The embodiment provides a high-speed train surrounding flow field visualization and chlorine ion corrosion early warning system, which comprises a fluorescent probe emitting device, an ultraviolet light exciting device, an imaging assembly, a data transmission assembly 9 and a data fusion system; the fluorescent probe emitting device is symmetrically arranged on the side wall of the tunnel along the radial direction of the tunnel; the ultraviolet light exciting device is arranged on the vault of the tunnel along the axial direction of the tunnel; the imaging assembly is arranged on the side wall of the tunnel in front of the ultraviolet light exciting device along the driving direction of the train; the data transmission assembly 9 is arranged in the tunnel and connected with the imaging assembly; and the data fusion system is connected with the data transmission assembly 9.

[0024] Referring to Figure 1 The fluorescent probe emitting device comprises sequentially connected carbon dot fluorescent probe storage 1, constant pressure conveying pipe 2 and atomizing sprayer 3; the carbon dot fluorescent probe storage 1 and the constant pressure conveying pipe 2 are arranged on the bottom surface of the side wall of the tunnel, and the atomizing sprayer 3 extends from the bottom surface of the side wall of the tunnel to the top surface of the side wall of the tunnel.

[0025] The carbon dot fluorescent probe storage 1 is provided with a pneumatic pressurizing module, the atomizing sprayer 3 is provided with a pressure sensor, and the pressure sensor is connected with the pneumatic pressurizing module. After being started and pressurized, the carbon dot fluorescent probe stored in the carbon dot fluorescent probe storage 1 is transported to the atomizing sprayer 3 by the constant pressure conveying pipe 2, is uniformly sprayed into the flow field in the tunnel by the atomizing sprayer 3, the pressure in the atomizing sprayer 3 is monitored in real time by the pressure sensor, and is adjusted in real time by the pneumatic pressurizing module, so that the chlorine ions are uniformly labeled.

[0026] In the embodiment, the ultraviolet light exciting device is obliquely arranged, the included angle between the ultraviolet light exciting device and the central axis of the tunnel is 30°±5°, and the laser beams emitted by the multiple groups of ultraviolet light exciting devices cover the cross section of the tunnel. Figure 2 The ultraviolet light exciting device comprises an ultraviolet laser emitter 7 and a laser beam expander 8, the laser beam expander 8 is connected with the ultraviolet laser emitter 7, is used for adjusting the diameter and divergence angle of the laser beam, realizes the comprehensive coverage of the laser beam on the monitoring area, and enables the carbon dot fluorescent probe near the train to be effectively captured by the imaging assembly.

[0027] Referring to Figure 3 The imaging assembly comprises a camera 4, a camera support frame 5 and an anti-fog lens 6; the camera 4 is adjustably mounted on the side wall of the tunnel through the camera support frame 5, the shooting angle of the camera 4 is adjustable (for the structure of the camera support frame 5, reference is made to the prior art, and the adjustment of the shooting angle of the camera 4 can be realized), and the anti-fog lens 6 is mounted at the front end of the lens of the camera 4, can prevent the water vapor in the high-humidity environment of the submarine tunnel from condensing on the surface of the lens to form a fog film, and thus maintains the optical clarity.

[0028] Referring to Figure 4The data transmission component 9 adopts a relayer to transmit the data acquired by the imaging component to a base station at the tunnel portal, and the base station transmits the data to the data fusion system; In the embodiment, the data fusion system comprises a data analysis processing module and an early warning module, the data analysis processing module is connected with the data transmission component 9, and is used for analyzing, processing and calculating the data transmitted by the data transmission component 9 to generate an corrosion risk index; the early warning module is connected with the data analysis processing module, and is used for early warning the corrosion risk of chloride ions in real time according to the corrosion risk index.

[0029] The data fusion system further comprises a display module connected with the data transmission component 9, and is used for realizing the visualization of the flow field around the high-speed train.

[0030] In the embodiment, a control system is further included, which is connected with each device or component, and is used for controlling corresponding operations.

[0031] The high-speed train surrounding flow field visualization and chloride ion corrosion early warning system provided by the application realizes the visualization of the flow field around the high-speed train based on the carbon dot fluorescent probe, the ultraviolet light excitation device and the imaging component, realizes the transmission of data and the calculation of the corrosion risk index through the data transmission component and the data fusion system, and further realizes the early warning of the corrosion risk of chloride ions.

[0032] Referring to Figure 5 The embodiment provides a high-speed train surrounding flow field visualization and chloride ion corrosion early warning method, which comprises the following steps: Step S1, the fluorescent probe emission device, the ultraviolet light excitation device and the imaging component are installed on the test section of the submarine tunnel; Step S2, the position of the ultraviolet light excitation device is adjusted to form a laser curtain at the monitored entire tunnel cross section position; Step S3, the imaging component is adjusted to ensure that the camera can clearly and completely capture the flow field around the high-speed train; Step S4, the fluorescent probe emission device is started to make the carbon dot fluorescent probes uniformly distributed in the flow field in the tunnel to mark the chloride ions, and the moving track is formed after refraction of the laser curtain; the imaging component is started to capture the moving track in real time; Step S5, the data captured by the imaging component is uploaded to the data fusion system through the data transmission component 9 to realize the visualization of the flow field around the high-speed train; and the corrosion risk of chloride ions is early warned in real time through the corrosion risk prediction model.

[0033] In step S5, the corrosion risk of chloride ions is early warned in real time through the corrosion risk prediction model, and the specific process is as follows: Step S5.1, a three-dimensional flow velocity vector field is acquired based on a flow field velocity vector calculation formula; and the concentration of chloride ions is acquired based on a chloride ion concentration inversion formula; The flow field velocity vector calculation formula is as follows: ; In the above formula, is a three-dimensional velocity field; is the fluorescence probe of carbon dots in x , y , z directional velocity component; is the displacement vector of the particle; is the fluorescence particle image at the moment, is the fluorescence particle image at the moment; ; The chloride ion concentration inversion formula is as follows: ; In the above formula, is the initial fluorescence intensity when there is no Cl - ; is the fluorescence intensity when there is Cl - ; is the quenching constant; is the chloride ion concentration, denotes the turbulent flow-quenching coupling coefficient, denotes the Frobenius norm of the velocity gradient tensor; Step S5.2, based on the chloride ion concentration and the three-dimensional flow velocity vector field, coupling operation is performed to obtain the change rate of the chloride ion concentration with time; The chloride ion migration-diffusion equation is as follows: ; In the above formula, C is the concentration field; is the flow velocity vector field; is the diffusion coefficient; is the aerosol source term, t is time, denotes the change rate of the chloride ion concentration with time.

[0034] Step S5.3, based on the chloride ion concentration, the change rate of the chloride ion concentration and the three-dimensional flow velocity vector field, a corrosion risk prediction model is established; The corrosion risk prediction model formula is as follows: ; In the above formula, R is the cumulative deposition amount per unit area, t 1 and t2 represents the time when the nose of the train's front passes through and the time when the nose of the train's rear passes through; The integral domain is the surface area of ​​the tunnel wall. and This is the cumulative weighting coefficient.

[0035] Step S5.4: Dynamically generate the corrosion risk index based on the corrosion risk prediction model, i.e., the cumulative corrosion risk per unit area. sediment volume R It provides real-time early warning of chloride ion corrosion risk based on the corrosion risk index.

[0036] This invention utilizes the fluorescence quenching effect and flow field tracing characteristics of carbon dot probes to... Aerosol distribution is directly mapped to three-dimensional velocity field data, establishing a matching relationship between chloride ion diffusion paths and flow field evolution. Simultaneously, engineering corrosion diagnostic parameters (i.e., corrosion risk index) and hydrodynamic characteristic spectra (visualization of the flow field around high-speed trains) are output, providing valuable data for tunnel structural health assessment. Concentration threshold early warning can also provide support for optimizing the aerodynamic shape of trains, realizing the dual reuse of safety monitoring and basic scientific research value.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-speed train surrounding flow field visualization and chloride ion corrosion early warning system, characterized in that, The application relates to a tunnel train flow field visualization system, which comprises fluorescent probe emitting devices, ultraviolet light exciting devices, imaging assemblies, data transmission assemblies (9) and a data fusion system; the fluorescent probe emitting devices are symmetrically arranged on the side walls of a tunnel along a radial direction of the tunnel; the ultraviolet light exciting devices are arranged on the vaults of the tunnel along an axial direction of the tunnel; The imaging assemblies are arranged on the side walls of the tunnel in front of the ultraviolet light exciting devices along a train running direction; the data transmission assemblies (9) are arranged in the tunnel and are connected with the imaging assemblies; and the data fusion system is connected with the data transmission assemblies (9). 2.The high-speed train surrounding flow field visualization and chloride ion corrosion early warning system according to claim 1, characterized in that, The fluorescent probe emitting devices comprise sequentially connected carbon dot fluorescent probe storage devices (1), constant pressure conveying pipes (2) and atomizing injectors (3); the carbon dot fluorescent probe storage devices (1) and the constant pressure conveying pipes (2) are arranged on the bottom surfaces of the side walls of the tunnel, and the atomizing injectors (3) extend along the bottom surfaces of the side walls of the tunnel to the top surfaces of the side walls of the tunnel. 3.The high-speed train surrounding flow field visualization and chloride ion corrosion warning system according to claim 2, characterized in that, The carbon dot fluorescent probe storage devices (1) are provided with pneumatic pressurizing modules, and the atomizing injectors (3) are provided with pressure sensors which are connected with the pneumatic pressurizing modules.

4. The high-speed train surrounding flow field visualization and chloride ion corrosion early warning system according to claim 1, characterized in that, The imaging assemblies comprise cameras (4), camera support frames (5) and anti-fog lenses (6); the cameras (4) are adjustably mounted on the side walls of the tunnel through the camera support frames (5), and the anti-fog lenses (6) are mounted in front of the lenses of the cameras (4).

5. The high-speed train surrounding flow field visualization and chloride ion corrosion early warning system according to claim 1, characterized in that, The ultraviolet light exciting devices are obliquely arranged, and the included angle between the ultraviolet light exciting devices and the central axis of the tunnel is 30 DEG + 5 DEG ; The ultraviolet light exciting devices comprise ultraviolet laser emitters (7) and laser beam expander mirrors (8), the laser beam expander mirrors (8) are connected with the ultraviolet laser emitters (7) and are used for adjusting the diameters and divergence angles of laser beams.

6. The high-speed train surrounding flow field visualization and chloride ion corrosion warning system according to claim 1, characterized in that, The data transmission assemblies (9) adopt relay devices to transmit the data acquired by the imaging assemblies to base stations at tunnel entrances, the data is transmitted to the data fusion system by the base stations; The data fusion system comprises a data analysis processing module and a warning module, the data analysis processing module is connected with the data transmission assemblies (9), and the warning module is connected with the data analysis processing module.

7. A method for visualizing the flow field around a high-speed train and early warning of chloride ion corrosion, characterized in that, The application further discloses a tunnel train flow field visualization method, which comprises the following steps: Step S1, installing the fluorescent probe emitting devices, the ultraviolet light exciting devices and the imaging assemblies on a test section of a submarine tunnel; Step S2, adjusting the positions of the ultraviolet light exciting devices to form a laser curtain at the whole tunnel cross section position to be monitored; Step S3, adjusting the imaging assemblies to ensure that the cameras can clearly and completely capture the flow field around a high-speed train; Step S4, starting the fluorescent probe emitting devices to make the carbon dot fluorescent probes uniformly distribute in the flow field in the tunnel to mark the chlorine ions, the laser curtain is refracted to form a moving track; Starting the imaging assemblies to capture the moving track in real time; Step S5, uploading the data captured by the imaging assemblies to the data fusion system through the data transmission assemblies (9) to realize the visualization of the flow field around the high-speed train, and realizing the real-time warning of the chlorine ion corrosion risk through a corrosion risk prediction model.

8. The method of visualizing the flow field around a high-speed train and warning of chloride ion corrosion according to claim 7, characterized in that, In step S5, the real-time warning of the chlorine ion corrosion risk through the corrosion risk prediction model is specifically as follows: Step S5.1, acquiring a three-dimensional flow velocity vector field based on a flow field velocity vector calculation formula and acquiring a chlorine ion concentration based on a chlorine ion concentration inversion formula; Step S5.2, based on the chloride ion concentration and the three-dimensional flow velocity vector field, a coupling operation is performed to obtain the rate of change of the chloride ion concentration with time; Step S5.3, based on the chloride ion concentration, the rate of change of the chloride ion concentration, and the three-dimensional flow velocity vector field, a corrosion risk prediction model is established; Step S5.4, based on the corrosion risk prediction model, a corrosion risk index is dynamically generated, and the chloride ion corrosion risk is real-time warned according to the corrosion risk index.

9. The method of visualizing the flow field around a high-speed train and warning of chloride ion corrosion according to claim 8, characterized in that, In step S5.1, the flow field velocity vector calculation formula is as follows: ； In the above formula, It is a three-dimensional velocity field; It is a carbon dot fluorescent probe in x , y , z The velocity component in the direction; This is the displacement vector of the particle; for Images of fluorescent particles at time points. for Images of fluorescent particles at specific times; The chloride ion concentration inversion formula is as follows: ； In the above formula, is zero Cl - the initial fluorescence intensity at time t = 0; is the presence Cl - the fluorescence intensity at time t = t; is the quenching constant; is the chloride ion concentration, denotes the turbulence-quenching coupling coefficient, denotes the Frobenius norm of the velocity gradient tensor; In step S5.2, the chloride ion migration-diffusion equation is as follows: ； In the above formula, C is concentration field; is the flow velocity vector field; is the diffusion coefficient; is the aerosol source term.

10. The method of visualizing the flow field around a high-speed train and warning of chloride ion corrosion according to claim 9, characterized in that, In step S5.3, the corrosion risk prediction model formula is as follows: ； In the above formula, R Cumulative per unit area Deposition amount, t 1 and t 2 represents the time when the nose of the train's front passes through and the time when the nose of the train's rear passes through; The integral domain is the surface area of ​​the tunnel wall. and This is the cumulative weighting coefficient.

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