Phase change material leakage plugging simulation test platform in high flow rate environment

Abstract

The utility model discloses a kind of phase change material leakage plugging simulation test platforms under high flow rate environment, comprising: hydraulic circulation subsystem and temperature control grouting subsystem;Hydraulic circulation subsystem includes water supply pump group, inlet water pressure stabilizing tank, leakage simulation passage and outlet tank in turn, adjustable backplate is equipped in inlet water pressure stabilizing tank, and channel inlet pressure is controlled by overflow height;Temperature control grouting subsystem includes the grouting container with heating function of storage and grouting pipeline, and grouting pipeline end extends to pressure stabilizing zone or channel entrance place.The utility model realizes the coupling simulation of high-temperature slurry and low-temperature water flow by temperature control structure, constant water head boundary is constructed using overflow backplate, and the phase change plugging process under high flow rate can be reproduced.

Description

Technical Field

[0001] This utility model relates to the field of safety maintenance and material testing technology for water conservancy and hydropower projects, and in particular to a simulation test platform for leakage sealing of phase change materials under high flow velocity environment. Background Technology

[0002] High dam structures such as asphalt concrete core dams are prone to forming concentrated seepage channels due to complex geological conditions and high-pressure water erosion during long-term operation. If these channels are not sealed in time, the high-speed water flow will continue to erode the dam material, potentially leading to dam failure. Therefore, studying the retention and solidification mechanisms of novel sealing materials (such as thermoplastic phase change materials) under dynamic water flow environments is helpful for emergency rescue operations.

[0003] Currently, experimental research on leakage sealing materials relies on static permeameters or water circulation pipeline devices. Existing experimental setups consist of a water storage container, a slurry pump, and a section of transparent pipeline, used to test the erosion resistance or setting time of traditional cement-based grouts or chemical grouting materials under ambient temperature conditions. While some studies involve dynamic water grouting, their setups often focus on verifying the final strength indicators of the material, or simply changing the flow rate by adjusting the pump speed to simulate different hydraulic gradient environments.

[0004] However, existing experimental setups suffer from structural defects in simulating phase change materials and real-world high-flow-rate conditions. Therefore, further research is needed to address these issues. Utility Model Content

[0005] The purpose of this utility model is to address the problems existing in the prior art by providing a simulation test platform for the leakage sealing of phase change materials under high flow rate conditions.

[0006] Technical solution: A simulation test platform for phase change material leakage sealing under high flow rate environment, comprising:

[0007] The hydraulic circulation subsystem includes a water supply pump set, an inlet pressure stabilizing tank, a leakage simulation channel assembly, an outlet tank, and a return water storage tank, which are physically connected in sequence through pipelines; the side wall of the inlet pressure stabilizing tank is provided with a connection interface that is compatible with the inlet end of the leakage simulation channel assembly.

[0008] The temperature-controlled grouting subsystem includes a grout storage container, a heat source component, and a grout delivery pipeline; the heat source component is located on the wall or inside of the grout storage container; the first end of the grout delivery pipeline is connected to the outlet of the grout storage container, and the second end forms a grouting nozzle;

[0009] The grouting nozzle physically extends to the internal space of the water inlet pressure stabilizing box or the inlet end of the leakage simulation channel component; the internal space of the water inlet pressure stabilizing box is equipped with a vertically arranged overflow regulating back plate, which physically divides the internal space of the water inlet pressure stabilizing box into a water inlet pressure stabilizing zone and an overflow return water zone, and the connection interface is opened on the side wall of the water inlet pressure stabilizing zone.

[0010] Optionally, the grouting delivery pipeline includes a pipeline body and a flexible heat tracing layer or a rigid heating jacket arranged axially along the pipeline body.

[0011] The flexible heat tracing layer or rigid heating jacket is tightly fitted or wrapped around the outer peripheral wall of the pipeline body;

[0012] The grout storage container has a probe interface on its side wall. The temperature control grouting subsystem also includes a temperature sensor probe, which passes through the probe interface and extends into the lower part of the inner cavity of the grout storage container.

[0013] Optionally, a pair of parallel guide grooves or guide rails are vertically provided on the inner walls of opposite sides of the water inlet pressure stabilizing box;

[0014] The overflow regulating backplate is a rigid flat plate structure. The two sides of the overflow regulating backplate are respectively embedded in the guide limiting groove or guide rail, forming a vertical sliding fit with the inner wall of the water inlet pressure stabilizing box.

[0015] The top surface of the overflow regulating backplate forms a horizontal overflow weir crest, and the fluid level in the inlet pressure stabilization zone is defined by the vertical distance between the overflow weir crest and the bottom of the inlet pressure stabilization tank.

[0016] Optionally, the leakage simulation channel assembly includes a transparent quartz glass tube in the shape of a hollow cylinder;

[0017] The connection interface on the inlet pressure stabilizing box is constructed as an outwardly protruding flange or socket interface;

[0018] The inlet end of the transparent quartz glass tube is axially connected and fixed to the connection interface through an annular sealing gasket or sealing flange;

[0019] The grouting nozzle of the grouting delivery pipeline is in the shape of a bent pipe or a straight pipe, and the end of the grouting nozzle is suspended in the fluid path of the water inlet pressure stabilization zone, or coaxially extended into the inlet end of the transparent quartz glass tube.

[0020] Optionally, the outlet tank includes a tank shell and a flow-rectifying baffle disposed inside the tank shell;

[0021] The lower side wall of the housing is provided with an inlet interface that connects to the outlet end of the leakage simulation channel component, and the upper or bottom side wall of the housing is provided with an outlet interface that connects to the return water storage tank.

[0022] The rectifier baffle is vertically fixed to the bottom wall of the tank shell and located between the inlet and outlet ports. The top of the rectifier baffle is lower than the top edge of the tank shell to form an energy-dissipating sedimentation zone inside the outlet tank that can maintain a predetermined liquid level.

[0023] Optionally, the water supply pump set includes a centrifugal pump unit and a flow regulating valve;

[0024] The side wall or bottom of the return water storage tank is equipped with a water suction port, and the suction port of the centrifugal pump unit is connected to the water suction port through a pipeline.

[0025] The outlet of the centrifugal pump unit is rigidly connected to the inlet of the flow regulating valve via a flange or pipe joint, and the outlet of the flow regulating valve extends into the water supply pipeline of the inlet pressure stabilizing tank.

[0026] The centrifugal pump unit is fixedly installed on a support base on one side or below the return water storage tank.

[0027] Optionally, the hydraulic circulation subsystem also includes an electromagnetic flowmeter assembly;

[0028] The water supply pipeline includes a straight section of pipe located between the flow regulating valve and the inlet pressure stabilizing box;

[0029] The electromagnetic flowmeter assembly is installed in series on a straight pipe section, and the pipe diameters at both ends of the electromagnetic flowmeter assembly are consistent with the pipe diameter of the straight pipe section, forming a fluid channel of equal diameter.

[0030] Optionally, the internal cavity of the transparent quartz glass tube is filled with a layer of simulated formation medium;

[0031] The simulated geological medium consists of a tightly packed aggregate of sand and gravel or a skeleton of crushed stone.

[0032] The inlet and outlet ends of the transparent quartz glass tube are respectively equipped with water-permeable barrier screens, and the simulated formation medium layer is axially constrained between the two water-permeable barrier screens.

[0033] Beneficial effects: This invention achieves coupled simulation of high-temperature slurry and low-temperature water flow through a temperature control structure, and constructs a constant head boundary using an overflow backplate, which can reproduce the phase change plugging process under high flow velocity. Therefore, further research is needed to solve the aforementioned problems existing in the prior art. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a phase change material leakage sealing simulation test platform under high flow rate environment provided by an embodiment of this utility model.

[0035] Figure 2 A schematic diagram of another phase change material leakage sealing simulation test platform provided for an embodiment of this utility model.

[0036] Figure 3 This is a schematic diagram of the structure of a phase change material leakage sealing simulation test platform under high flow rate environment provided in this embodiment of the utility model.

[0037] In the diagram, the components are: 1. Constant temperature grout storage tank; 2. Heated grouting pipe; 3. Temperature controller; 4. Inlet pressure stabilizing tank; 5. Overflow regulating back plate; 6. Transparent quartz tube; 7. Outlet water tank; 8. Outlet water tank baffle; 9. Flow meter; 10. Return water storage tank; 11. Pipeline centrifugal pump; 12. Valve; and 13. Electromagnetic flow meter. Detailed Implementation

[0038] In the description of this utility model, it should be understood that the terms center, longitudinal, transverse, upper, lower, front, back, left, right, vertical, horizontal, top, bottom, inner, and outer, etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms first, second, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0039] To address the aforementioned issues, the applicant conducted in-depth searches and analyses, and discovered:

[0040] Specifically, existing experimental setups lack a thermo-fluid coupling testing environment. Phase change materials rely on a phase change mechanism of hot injection and cold curing, but existing setups lack a full-chain temperature-controlled grouting structure, which leads to premature coagulation and pipe blockage of the high-temperature grout before it reaches the high-velocity, low-temperature water flow, or the inability to accurately control the rheological state of the grout when it enters the water, making it impossible to reproduce the fluid-thermal coupling sealing process.

[0041] Next, the simulation of hydraulic boundary conditions is distorted. Existing devices mostly use direct pump pressure drive, with strong coupling between flow velocity and pressure. During the closure process, as the channel gradually narrows, the pump pressure fluctuates violently, making it impossible to simulate the stable head boundary formed by the water level (constant potential energy) in the dam reservoir area.

[0042] Based on this, the non-constant pressure environment can cause experimental data to deviate significantly from actual engineering conditions, making it difficult to assess the sealing reliability of materials under continuous high pressure head.

[0043] To solve these problems, combined with Figures 1 to 3 The present invention will be specifically described through the following embodiments.

[0044] In some embodiments, a phase change material leakage sealing simulation test platform is provided under high flow velocity environment to simulate the leakage channel environment of the dam core wall under high water head pressure and high flow velocity scouring conditions, and to test the sealing performance of phase change material under such extreme environment.

[0045] This utility model includes: a constant temperature slurry storage tank (1), a heating grouting pipe (2), a temperature controller (3), a water inlet pressure stabilizing tank (4), an overflow regulating back plate (5), a transparent quartz tube (6), a water outlet tank (7), a water outlet tank baffle (8), a flow meter (9), a return water storage tank (10), a pipeline centrifugal pump (11), a valve (12), and an electromagnetic flow meter (13). Among them, the water inlet pressure stabilizing tank can also be called a water inlet tank, the transparent quartz tube can also be called a quartz tube, and the return water storage tank can also be simply called a water storage tank.

[0046] Accordingly, the platform's overall architecture mainly includes two functional modules: a hydraulic circulation subsystem and a temperature-controlled grouting subsystem, which are used to realize simulation functions.

[0047] The hydraulic circulation subsystem, serving as the basic architecture for simulating the water flow environment of the leakage channel, is specifically constructed as a closed fluid circulation loop in this embodiment. This loop includes a water supply pump set, an inlet pressure stabilizing tank (4), a leakage simulation channel assembly, an outlet tank (7), and a return water storage tank (10).

[0048] Among them, the return water storage tank (10) serves as the water source and return collection point of the entire system. It is usually an open or semi-closed container that can hold a sufficient volume of experimental water.

[0049] Optionally, the water supply pump set is specifically configured as a pipeline centrifugal pump (11), whose inlet is connected to the outlet of the side wall or bottom of the return water storage tank (10) via a pipeline to provide continuous circulation power for the system.

[0050] Optionally, the outlet of the pipeline centrifugal pump (11) is connected to a valve (12) via a flange or pipe joint. The valve (12) is used to regulate the flow rate in the pipeline. The outlet end of the valve (12) is connected to a straight delivery pipeline, on which an electromagnetic flow meter (13) is installed in series for real-time monitoring of the fluid flow rate entering the system.

[0051] Optionally, the end of the delivery pipeline extends and connects to the inlet of the inlet pressure stabilizing tank (4). The inlet pressure stabilizing tank (4) is a container structure used to stabilize the upstream water head pressure, and a connection interface is provided on its side wall. In this embodiment, a transparent quartz tube (6) with a predetermined inner diameter (e.g., 0.05m) and length (e.g., 1.2m) is specifically selected to simulate the leakage channel in actual engineering. The inlet end of the transparent quartz tube (6) is sealed to the connection interface on the inlet pressure stabilizing tank (4), and its outlet end is connected to the inlet interface of the outlet tank (7). The outlet tank (7) serves as the control node for the downstream water level, and it guides the fluid back to the return water storage tank (10) through the pipeline to complete the entire hydraulic cycle.

[0052] Based on this, the platform is also equipped with a temperature-controlled grouting subsystem, which is used to introduce phase change materials into a hydraulic circulation environment for sealing tests.

[0053] Furthermore, the temperature-controlled grouting subsystem includes a grout storage container, a heat source component, and a grout delivery pipeline. In this embodiment, the grout storage container is specifically constructed as a constant-temperature grout storage tank (1), which is placed on a support frame at a higher position and uses gravitational potential energy to assist grouting, or is connected to an additional pressurization device.

[0054] Furthermore, the heat source component is located on the wall or inside the slurry storage container, such as an electric heating jacket wrapped around the outside of the tank wall or a built-in heating rod, to maintain the phase change material in a liquid state. The first end of the grouting delivery pipeline is connected to the bottom outlet of the constant temperature slurry storage tank (1), and it is itself constructed as a heated grouting pipe (2), that is, the outside of the pipe wall is wrapped with a heat insulation layer and a heat tracing cable.

[0055] Furthermore, the second end of the heated grouting pipe (2) forms a grouting nozzle that physically extends into the internal space of the inlet pressure stabilizing box (4) or the inlet end of the leakage simulation channel assembly.

[0056] In addition, the subsystem is equipped with a temperature controller (3) for accurate control of the heating temperature. Through the physical coupling of the hydraulic circulation subsystem and the temperature control grouting subsystem, the high-temperature liquid phase change material can be injected into the high-velocity low-temperature water flow channel simulated by the heated grouting pipe (2) and the phase change material in the dynamic water environment is reproduced as a thermal-fluid coupling and solidification sealing process.

[0057] In order to ensure that the phase change material is always maintained within the accurate preset temperature range before being injected into the model, and to prevent it from solidifying and clogging the pipeline in advance, this embodiment further defines the specific physical structure of the temperature-controlled grouting subsystem.

[0058] Accordingly, the grouting pipeline in this embodiment is specifically constructed as a heated grouting pipe (2). The heated grouting pipe (2) is not a single-layer pipe, but includes an internal pipeline body and a flexible heat tracing layer tightly wrapped along the axial direction of the pipeline body. The flexible heat tracing layer can be a wound resistance heating tape or an integrally formed heat-insulating heating jacket, which is tightly attached to the outer peripheral wall of the pipeline body and extends to cover the entire path from the outlet of the constant temperature grout storage tank (1) to the grouting end. Through the fully covered heat tracing structure, heat loss during pipeline transmission can be compensated, allowing the grout to reach the grouting point with predetermined liquid rheological properties.

[0059] The slurry storage container, namely the constant temperature slurry storage tank (1), has a dedicated probe interface on its side wall. The temperature-controlled grouting subsystem further includes a temperature sensor probe electrically connected to the temperature controller (3). In actual assembly, the temperature sensor probe passes through the probe interface and extends deep into the lower part of the inner cavity of the constant temperature slurry storage tank (1), directly contacting the slurry at the bottom.

[0060] Among them, the temperature controller (3) serves as the core of the system control. Based on the real-time temperature signal fed back by the probe, it dynamically adjusts the output power of the heating layer of the heating grouting pipe (2) and the constant temperature grout storage tank (1) through a PID algorithm. The design of this closed-loop temperature control structure not only solves the problem of the phase change material being sensitive to temperature, but also avoids control errors caused by the inconsistency between the surface temperature and the center temperature through the deep insertion of the probe.

[0061] In other embodiments, the specific construction of the inlet pressure stabilizing tank (4) and its internal regulating mechanism is described. This is used to realistically simulate the impact of reservoir water level changes on the inlet pressure of the seepage channel, achieving high-precision constant head control.

[0062] Specifically, the interior of the inlet pressure stabilizing tank (4) is provided with a vertically arranged overflow adjustment backplate (5), or in other words, an inlet tank baffle (5). In terms of physical connection, a pair of parallel guide limiting grooves are vertically machined on the inner walls of opposite sides of the inlet pressure stabilizing tank (4), which, together with the overflow adjustment backplate (5), realize up and down adjustment.

[0063] The overflow regulating backplate (5) is made of rigid flat plate material, with its two sides embedded in guide limiting grooves to form a vertical sliding fit with the body of the inlet pressure stabilizing tank (4). The vertical position of the overflow regulating backplate (5) inside the tank can be changed by manually or mechanically pulling it up and down. The top surface of the overflow regulating backplate (5) forms a horizontal overflow weir crest, which physically divides the internal space of the inlet pressure stabilizing tank (4) into an upstream inlet pressure stabilizing zone and a downstream overflow return zone.

[0064] When the flow rate provided by the water supply pump set is greater than the flow rate of the leakage channel, the excess water will overflow and be discharged over the top of the overflow regulating backplate (5), so that the fluid level in the inlet pressure stabilization zone is always defined by the vertical height of the top of the overflow regulating backplate (5). This design utilizes the structure of the mechanical overflow principle, which can accurately set the pressure head at the inlet of the leakage channel by simply adjusting the height of the overflow regulating backplate (5) without changing the pump speed, thus achieving decoupled control of the pressure boundary conditions.

[0065] Based on this structure, the connection between the leakage simulation channel assembly and the inlet pressure stabilizing box (4) also adopts a predetermined sealing fit. The leakage simulation channel assembly, namely the transparent quartz tube (6) (hereinafter referred to as quartz tube), has its inlet end axially connected and fixed to the connection interface on the side wall of the inlet pressure stabilizing box (4) through an annular sealing gasket or flange, so that there is no leakage at the interface under the action of high pressure water head. At the same time, regarding the key physical interface of heat flow convergence, the grouting nozzle of the grouting delivery pipeline (in this embodiment, the heated grouting pipe, 2) is arranged in a bent or straight pipe shape, and the end of the grouting nozzle is not simply placed on the top of the box, but physically extends and is suspended in the fluid path of the inlet pressure stabilizing zone, and can be coaxially extended into the inlet end of the transparent quartz tube (6). The predetermined spatial layout allows the high-temperature phase change grout to be directly introduced into the inlet of the channel with the highest flow velocity and the most intense scouring, thus reproducing the dynamic process of the grout being carried by high-speed water flow, cooled and undergoing phase change sealing at the crack opening.

[0066] In other embodiments, an outlet tank (7) and its internal structure are described to ensure the smooth discharge of fluid after passing through the simulated channel and the accurate measurement of relevant hydraulic parameters.

[0067] Accordingly, the outlet tank (7) is not just a water collection container; its internal space is physically divided by a predetermined structure to achieve energy dissipation and flow stabilization functions. The outlet tank (7) includes a tank shell and a flow-rectifying baffle (outlet tank baffle, 8) installed inside the tank shell. In terms of spatial layout, the lower part of the side wall of the tank shell is provided with an inlet interface that connects to the outlet end of the transparent quartz tube (6), while the upper part or bottom of its side wall is provided with an outlet interface (overflow port on the upper side wall or drain pipe at the bottom) that connects to the return water storage tank (10).

[0068] The outlet tank baffle (8) is flat and vertically fixed to the bottom wall of the tank shell, positioned horizontally between the inlet and outlet ports. Notably, the top of the outlet tank baffle (8) is designed to be lower than the top edge of the tank shell. Therefore, when the high-speed water jet from the quartz tube (6) enters the outlet tank (7), it impacts or overturns the outlet tank baffle (8). This process physically creates an energy-dissipating sedimentation zone, consuming the kinetic energy of the water flow and eliminating the intense turbulence and bubbles generated by the high-speed jet, thus maintaining a relatively stable water level behind the outlet tank baffle (8).

[0069] In this stable flow field environment, the platform is also equipped with a flow meter (9). The flow meter (9) (e.g., a propeller or Doppler flow meter) is vertically mounted on a bracket, with its probe extending into the predetermined measurement area of ​​the outlet tank (7) or placed directly at the opening of the quartz tube (6), so as to obtain accurate flow velocity data without backflow interference.

[0070] In other embodiments, the layout of the power drive link and metering pipeline in the hydraulic circulation subsystem is defined. This is to ensure that the entire simulation platform can obtain continuous, stable, and accurately measurable circulation power.

[0071] In this embodiment, the water supply pump set specifically includes a centrifugal pump unit (i.e., a pipeline centrifugal pump, 11) and a flow regulating valve (valve, 12). In terms of physical connection, the pipeline centrifugal pump (11) is fixedly installed on a support base on one side of the return water storage tank (10), and its suction port is connected to the storage tank via a pipeline. The vertical discharge port of the pipeline centrifugal pump (11) is rigidly connected to the inlet end of the valve (12) via a flange.

[0072] Furthermore, a straight pipe section is specially configured between the valve (12) and the inlet pressure stabilizing box (4) in the water supply pipeline, which can be used to meet the requirements of high-precision metering. The electromagnetic flowmeter assembly, namely the electromagnetic flowmeter (13), is installed in series in the middle of this straight pipe section. Specifically, the flange faces at both ends of the electromagnetic flowmeter (13) are connected to the straight pipe section, and the length of the straight pipe section before and after the flowmeter meets the required multiple of the instrument diameter (e.g., 10D before and 5D after, where D is the pipe diameter), forming a fluid channel of equal diameter. The predetermined pipeline spatial layout eliminates the distortion of the flow field caused by bends or valves, allowing the fluid to flow through the electrode area of ​​the electromagnetic flowmeter (13) in a fully developed laminar or turbulent state, ensuring the accuracy of flow parameter monitoring in the experiment and providing a basis for calculating leakage.

[0073] In this embodiment, in addition to using a hollow transparent quartz tube (6) to simulate a single crack leakage condition, in order to further describe the seepage failure and sealing process of the porous medium inside the core wall of the simulated earth-rock dam, this embodiment provides a variant structure based on a leakage simulation channel component.

[0074] Optionally, the internal cavity of the transparent quartz tube (6) may not be empty, but may be filled with a simulated formation medium layer. This simulated formation medium layer consists of closely packed gravel particles or a crushed stone skeleton, and its particle size distribution is scaled down according to the core wall material in the actual project.

[0075] To maintain the morphological stability of the medium layer under the scouring of high-speed water flow, permeable barrier screens, such as stainless steel wire mesh or porous grid plates, are respectively installed on the inner sides of the inlet and outlet ends of the transparent quartz tube (6). The simulated formation medium layer is axially constrained between the two permeable barrier screens.

[0076] In this structure, when slurry containing phase change material is injected, the slurry will permeate, diffuse, and exchange heat within the pore network of the porous medium, rather than flowing through pipes. This embodiment allows the platform to study not only the sealing of piping-type channels but also the sealing mechanisms of fluid-flow or seepage-type channels, expanding the applicability and technical value of the experimental platform.

[0077] According to one aspect of this application, the present invention constructs a closed-loop leakage sealing simulation test platform for simulating the hydraulic characteristics of leakage channels of different sizes in the core wall at different flow rates indoors.

[0078] Optionally, the entire test platform consists of an inlet tank, an outlet tank, quartz tubes, a water storage tank, a pipeline centrifugal pump, valves, and an electromagnetic flow meter. The inlet tank uses a pull-out adjustable backplate, which, together with the centrifugal pump, controls the upstream water level. The test can simulate various core wall leakage channels by selecting transparent quartz tubes of different inner diameters and lengths; their transparency facilitates real-time observation of the entire process of slurry movement and sealing within the channels.

[0079] Furthermore, this application is used to compare the sealing effects of different grouting materials under high flow rates. A quartz tube with an inner diameter of 0.05m and a length of 1.2m can be used for the experiment. By changing the sealing material through a fixed channel, the influence mechanism of the grouting material characteristics on the sealing effect can be analyzed.

[0080] The experiment used a closed-loop water supply system. An electromagnetic flowmeter was installed in the full pipe section, and the measured volumetric flow rate was the leakage flow rate. The flowmeter reading was controlled to be 14.14 m³ / h by adjusting the pump valve opening. 3 / h can maintain the test conditions of an average flow velocity of 2m / s in the leakage channel.

[0081] The optional embodiments of the present utility model have been described in detail above. However, the present utility model is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present utility model, various equivalent transformations can be made to the technical solution of the present utility model, and these equivalent transformations all fall within the protection scope of the present utility model.

Claims

1. A simulation test platform for leakage sealing of phase change materials under high flow rate environment, characterized in that, include: The hydraulic circulation subsystem includes a water supply pump set, an inlet pressure stabilizing tank, a leakage simulation channel assembly, an outlet tank, and a return water storage tank, which are physically connected in sequence through pipelines; the side wall of the inlet pressure stabilizing tank is provided with a connection interface that is compatible with the inlet end of the leakage simulation channel assembly. The temperature-controlled grouting subsystem includes a grout storage container, a heat source component, and a grout delivery pipeline; the heat source component is located on the wall or inside of the grout storage container; the first end of the grout delivery pipeline is connected to the outlet of the grout storage container, and the second end forms a grouting nozzle; Among them, the grouting nozzle physically extends to the internal space of the water inlet pressure stabilizing box or the inlet end of the leakage simulation channel component; The inside of the inlet pressure stabilizing box is equipped with a vertically arranged overflow regulating back plate. The overflow regulating back plate physically divides the internal space of the inlet pressure stabilizing box into an inlet pressure stabilizing area and an overflow return water area. The connection interface is located on the side wall of the inlet pressure stabilizing area.

2. The simulation test platform for phase change material leakage sealing under high flow rate environment according to claim 1, characterized in that, The grouting delivery pipeline includes a pipeline body and a flexible heat tracing layer or rigid heating jacket arranged along the axial direction of the pipeline body; the flexible heat tracing layer or rigid heating jacket is tightly attached to or covers the outer peripheral wall of the pipeline body; a probe interface is provided on the side wall of the grout storage container, and the temperature control grouting subsystem also includes a temperature sensor probe, which passes through the probe interface and extends into the lower part of the inner cavity of the grout storage container.

3. The simulation test platform for phase change material leakage sealing under high flow rate environment according to claim 1, characterized in that, A pair of parallel guide grooves or guide rails are vertically installed on the inner walls of opposite sides of the inlet pressure stabilizing tank; the overflow regulating back plate is a rigid flat plate structure, and the two sides of the overflow regulating back plate are respectively embedded in the guide grooves or guide rails, forming a vertical sliding fit with the inner wall of the inlet pressure stabilizing tank; the top surface of the overflow regulating back plate forms a horizontal overflow weir top, and the fluid level height in the inlet pressure stabilizing zone is defined by the vertical distance between the overflow weir top and the bottom of the inlet pressure stabilizing tank.

4. The simulation test platform for phase change material leakage sealing under high flow rate environment according to claim 1, characterized in that, The leakage simulation channel assembly includes a hollow cylindrical transparent quartz glass tube; the connection interface on the inlet pressure stabilizing box is constructed as an outwardly protruding flange or socket interface; the inlet end of the transparent quartz glass tube is axially connected and fixed to the connection interface through an annular sealing gasket or sealing flange; the grouting nozzle of the grouting delivery pipeline is in the shape of a bent pipe or a straight pipe, and the end of the grouting nozzle is suspended in the fluid path of the inlet pressure stabilizing zone, or coaxially extended into the inlet end of the transparent quartz glass tube.

5. The simulation test platform for phase change material leakage sealing under high flow rate environment according to claim 1, characterized in that, The outlet tank includes an outer shell and a flow-rectifying baffle installed inside the outer shell. The lower side wall of the outer shell has an inlet interface that connects to the outlet end of the leakage simulation channel assembly, and the upper or lower side wall of the outer shell has an outlet interface that connects to the return water storage tank. The flow-rectifying baffle is vertically fixed to the bottom wall of the outer shell and is located between the inlet interface and the outlet interface. The top height of the flow-rectifying baffle is lower than the top edge height of the outer shell, forming an energy-dissipating sedimentation zone inside the outlet tank that can maintain a predetermined liquid level.

6. The simulation test platform for phase change material leakage sealing under high flow rate environment according to claim 1, characterized in that, The water supply pump set includes a centrifugal pump unit and a flow regulating valve; the side wall or bottom of the return water storage tank is provided with a water suction port, and the suction port of the centrifugal pump unit is connected to the water suction port through a pipeline; the discharge port of the centrifugal pump unit is rigidly connected to the inlet end of the flow regulating valve through a flange or pipe joint, and the outlet end of the flow regulating valve extends into the water supply pipeline of the inlet pressure stabilizing box; the centrifugal pump unit is fixedly installed on a support base on one side or below the return water storage tank.

7. The simulation test platform for phase change material leakage sealing under high flow rate environment according to claim 6, characterized in that, The hydraulic circulation subsystem also includes an electromagnetic flow meter assembly; the water supply pipeline includes a straight pipe section located between the flow regulating valve and the inlet pressure stabilizing box; the electromagnetic flow meter assembly is installed in series on the straight pipe section, and the pipe diameters at both ends of the electromagnetic flow meter assembly are consistent with the pipe diameters of the straight pipe section, forming a fluid channel of equal diameter.

8. The simulation test platform for phase change material leakage sealing under high flow rate environment according to claim 4, characterized in that, The internal cavity of the transparent quartz glass tube is filled with a simulated formation medium layer; the simulated formation medium layer is composed of tightly packed sand and gravel particles or a skeleton of crushed stone; water-permeable barrier screens are respectively installed on the inner side of the inlet and outlet ends of the transparent quartz glass tube, and the simulated formation medium layer is axially constrained between the two water-permeable barrier screens.

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