System and method for measuring heat-fluid-solid coupling characteristic of high-pressure gas storage working medium in channel

Abstract

The invention provides a heat-fluid-solid coupling characteristic measurement system for a high-pressure gas storage working medium in a channel. Before a measurement experiment, the system uses inert gas to clean the measurement system and discharges the inert gas through an electromagnetic three-way valve; during a measurement experiment, the low-temperature cooling liquid circulating pump cools a gas storage working medium in the storage tank to a liquid state, the high-pressure circulating pump pumps the gas storage working medium in the storage tank to the preheating unit, the preheating unit adjusts the temperature of the gas storage working medium, and the electromagnetic three-way valve conveys the gas storage working medium output by the preheating unit to the experiment unit for heating; the mass flow meter, the pressure sensor and the differential pressure gauge measure and detect the mass flow and the differential pressure of the gas storage working medium, the strain detection unit and the temperature detection unit detect the stress and the wall surface temperature borne by the pipeline wall surface of the experiment unit, and the cooling unit cools the gas storage working medium output by the experiment unit. A gas storage working medium output by the cooling unit reaches the storage tank through the back pressure valve, and the high-pressure circulating pump and the back pressure valve are regulated and controlled to enable the gas storage working medium to be kept in a set flow pressure state.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal fluid-solid coupling characteristic measurement, and in particular to a thermal fluid-solid coupling characteristic measurement system and method for a high-pressure gas storage medium in a channel. Background Art

[0002] Compressed gas energy storage has the advantages of large scale, low cost, clean and pollution-free, and is considered to be one of the most promising large-scale energy storage technologies. In large-capacity energy storage systems, how to tackle underground gas storage technology is the key to the safe, stable and economical operation of energy storage systems. Compared with salt cavern gas storage and ground tank gas storage, underground gas storage has the advantages of large capacity, strong economy, and no regional restrictions. It is an ideal gas storage technology for compressed gas energy storage systems.

[0003] In underground gas storage, the most critical thing is to maintain the long-term, safe and stable storage of gas storage fluids in the gas storage, which requires the gas storage to have good sealing, mechanical stability and long life cycle. However, the periodic compression and expansion behavior of the gas storage fluid affects the structure and material strength of the gas storage channel: on the one hand, the pressure change of the gas storage fluid will directly apply alternating stress to the pipeline wall; on the other hand, the increase in the internal energy of the fluid will cause uneven temperature distribution on the pipeline wall, resulting in local thermal stress. For this reason, in addition to further developing low-cost gas storage sealing technology, how to measure the flow and heat transfer behavior of the gas storage fluid in the gas storage and even the entire gas storage system is the key to ensuring the controllability of the system, maintaining the stable operation of the system, and ensuring safe production.

[0004] The flow heat transfer behavior is generally reflected by the thermal fluid-solid coupling characteristics. The thermal fluid-solid coupling characteristics of high-pressure gas storage working fluids are characterized by temperature, velocity and strain. In the existing technical solutions, the measurement of temperature and strain is usually carried out separately. In terms of temperature measurement, it is necessary to build a convective heat transfer experimental system for high-pressure gas storage working fluids, and use thermocouples, thermal resistors, infrared thermal imaging and other methods to measure the temperature. In terms of strain measurement, there is currently no related work applied to the convective heat transfer process of high-pressure gas storage working fluids.

[0005] The measurement of the thermal flow-solid characteristics of high-pressure gas storage working fluid is a complex and critical research work. First of all, it is necessary to build an integrated measurement system. This system must have the ability to accurately adjust pressure, temperature, heating power and mass flow. The current high-pressure gas storage working fluid system has made certain progress in the measurement of thermal flow characteristics, but it still faces challenges in effectively combining the measurement of the three characteristics of heat, flow and solid. Therefore, there is currently a lack of a measurement method that effectively combines the existing heat flow measurement system with strain measurement technology to form a thermal-solid flow characteristic measurement system for high-pressure gas storage working fluids and ensures the accuracy of the measurement data of the measurement system. Summary of the invention

[0006] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, the first purpose of the present invention is to propose a thermal-fluid-solid coupling characteristic measurement system for high-pressure gas storage working fluid in a channel, so as to realize the comprehensive measurement of the thermal, fluid and solid characteristics of the high-pressure gas storage working fluid and ensure the accuracy of the measurement data.

[0008] The second object of the present invention is to provide a method for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage medium in a channel.

[0009] To achieve the above-mentioned purpose, the first aspect of the present invention proposes a thermal fluid-solid coupling characteristic measurement system for a high-pressure gas storage medium in a channel, comprising a low-temperature coolant circulation pump, a storage tank, a high-pressure circulation pump, a preheating unit, an electromagnetic three-way valve, a mass flow meter, an experimental unit, a pressure sensor, a differential pressure gauge, a strain detection unit, a temperature detection unit, a cooling unit, a back pressure valve, and a data collection system;

[0010] Before the measurement experiment, the measurement system is cleaned with inert gas, and the inert gas is discharged through the electromagnetic three-way valve; during the measurement experiment, the low-temperature coolant circulation pump cools the gas storage medium in the storage tank to a liquid state, the high-pressure circulation pump pumps the gas storage medium in the storage tank to the preheating unit, the preheating unit adjusts the temperature of the gas storage medium, and the electromagnetic three-way valve sends the gas storage medium output by the preheating unit to the experimental unit; the experimental unit heats the gas storage medium; the mass flow meter is used to detect the mass flow of the gas storage medium entering the experimental unit, the pressure sensor and the differential pressure gauge are used to measure the pressure difference of the gas storage medium, the strain detection unit and the temperature detection unit are used to detect the stress and the temperature of the pipeline wall of the experimental unit and send them to the data collection system, the cooling unit cools the gas storage medium output by the experimental unit, and the gas storage medium output by the cooling unit reaches the storage tank through the back pressure valve, wherein the high-pressure circulation pump and the back pressure valve are regulated so that the gas storage medium maintains the set flow pressure state.

[0011] In the thermal fluid-solid coupling characteristic measurement system of the high-pressure gas storage working fluid in the channel provided by the first aspect of the present invention, the preheating unit includes a preheating section pipeline, a first heating power supply and a resistance wire, the inlet of the preheating section pipeline is connected to the high-pressure circulation pump, the outlet of the preheating section pipeline is connected to the electromagnetic three-way valve, the outer periphery of the preheating section pipeline is wrapped with the resistance wire, the resistance wire is connected to the first heating power supply, and the temperature of the gas storage working fluid is adjusted by controlling the current of the first heating power supply.

[0012] In the thermal fluid-solid coupling characteristic measurement system for high-pressure gas storage medium in a channel provided by the first aspect of the present invention, the strain detection unit includes a resistance transmitter and a plurality of strain gauges, and the plurality of strain gauges are arranged on the experimental section pipeline of the experimental unit.

[0013] In the thermal fluid-solid coupling characteristic measurement system of the high-pressure gas storage working fluid in the channel provided by the first aspect of the present invention, the temperature detection unit includes a temperature transmitter and a plurality of thermocouples, the plurality of thermocouples are arranged on the experimental section pipeline, the number of strain gauges is consistent with the number of thermocouples, and the installation positions of each thermocouple and a corresponding strain gauge are opposite.

[0014] In the thermal fluid-solid coupling characteristic measurement system for high-pressure gas storage working fluid in a channel provided by the first aspect of the present invention, the temperature detection unit also includes a plurality of armored thermocouples, which are arranged at the inlet and outlet sides of the experimental section pipeline.

[0015] In the thermal fluid-solid coupling characteristic measurement system of the high-pressure gas storage working fluid in the channel provided by the first aspect of the present invention, the experimental unit includes a second heating power supply, a heating guide wire and two fixing devices, the two fixing devices are respectively fixed at the inlet and outlet of the experimental section pipeline, each fixing device connects the experimental section pipeline and the heating guide wire, the heating guide wire is connected to the second heating power supply, and the heat flux density is controlled by adjusting the current of the second heating power supply.

[0016] In the thermal fluid-solid coupling characteristic measurement system of the high-pressure gas storage working fluid in the channel provided by the first aspect of the present invention, it also includes a pressure stabilizing tank and a check valve, and the high-pressure circulation pump is connected to the inlet of the preheating section pipeline through the pressure stabilizing tank and the check valve.

[0017] To achieve the above-mentioned purpose, the second aspect of the present invention proposes a method for measuring the thermal fluid-solid coupling characteristics of a thermal fluid-solid coupling characteristics measurement system for a high-pressure gas storage medium in a channel based on the first aspect, comprising:

[0018] Fill in inert gas to clean the thermal fluid-solid coupling characteristic measurement system;

[0019] After cleaning is completed, the measurement experiment begins, the storage tank is filled with gas storage medium and the low-temperature coolant circulation pump is turned on to cool the gas storage medium in the storage tank;

[0020] Setting a target flow rate, turning on a high-pressure circulation pump, and using the high-pressure circulation pump to keep the flow rate in the pipeline of the thermal fluid-solid coupling characteristic measurement system at the target flow rate;

[0021] Setting a target inlet pressure, and controlling and adjusting the opening of the back pressure valve so that the pressure sensor is maintained at the target inlet pressure;

[0022] Setting a target inlet temperature and adjusting the current of the first heating power supply so that the temperature measurement result of the armored thermocouple at the inlet side of the experimental section pipeline is maintained at the target inlet temperature;

[0023] Setting a target heat flux density, and adjusting the current of the second heating power source based on the target heat flux density;

[0024] The detection data corresponding to the mass flow meter, pressure sensor, differential pressure gauge, strain detection unit, and temperature detection unit are recorded to complete the measurement of the thermal fluid-solid coupling characteristics of the gas storage medium under a single working condition.

[0025] In the method for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage medium in a channel provided in the second aspect of the present invention, after the thermal fluid-solid coupling characteristics measurement system is cleaned with an inert gas, the method further includes: filling the gas storage medium to perform secondary cleaning on the thermal fluid-solid coupling characteristics measurement system.

[0026] In the method for measuring the thermal-fluid-solid coupling characteristics of a high-pressure gas storage working fluid in a channel provided in the second aspect of the present invention, the current of the second heating power supply is adjusted based on the target heat flux density, including: obtaining the current current value of the second heating power supply, calculating the heating power based on the current current value using Ohm's law, calculating the current heat flux density based on the heating power and the cross-sectional area of ​​the experimental section pipeline, and adjusting the current of the second heating power supply until the current heat flux density is equal to the target heat flux density.

[0027] The present invention provides a system and method for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage medium in a channel. The measuring system includes a low-temperature coolant circulation pump, a storage tank, a high-pressure circulation pump, a preheating unit, an electromagnetic three-way valve, a mass flow meter, an experimental unit, a pressure sensor, a differential pressure gauge, a strain detection unit, a temperature detection unit, a cooling unit, a back pressure valve, and a data collection system. Before the measurement experiment, the measuring system is cleaned with an inert gas, and the inert gas is discharged through the electromagnetic three-way valve. During the measurement experiment, the low-temperature coolant circulation pump cools the gas storage medium in the storage tank to a liquid state, and the high-pressure circulation pump pumps the gas storage medium in the storage tank to the preheating unit. The preheating unit is adjusted. The temperature of the gas storage medium is controlled, and the electromagnetic three-way valve sends the gas storage medium output by the preheating unit to the experimental unit; the experimental unit heats the gas storage medium; the mass flow meter is used to detect the mass flow of the gas storage medium entering the experimental unit, the pressure sensor and the differential pressure gauge are used to measure the pressure difference of the gas storage medium, the strain detection unit and the temperature detection unit are used to detect the stress on the pipeline wall of the experimental unit and the pipeline wall temperature and send them to the data collection system, the cooling unit cools the gas storage medium output by the experimental unit, and the gas storage medium output by the cooling unit reaches the storage tank through the back pressure valve, wherein the high-pressure circulation pump and the back pressure valve are regulated to keep the gas storage medium in the set flow pressure state. In this case, a circulation loop is obtained by integrating a low-temperature coolant circulation pump, a storage tank, a high-pressure circulation pump, a preheating unit, an electromagnetic three-way valve, a mass flowmeter, an experimental unit, a pressure sensor, a differential pressure gauge, a strain detection unit, a temperature detection unit, a cooling unit, and a back pressure valve. The strain detection unit and the temperature detection unit are used to detect the stress on the pipeline wall and the pipeline wall temperature respectively, and the mass flowmeter, the pressure sensor and the differential pressure gauge are used to detect the flow and pressure difference of the high-pressure gas storage medium, so as to achieve a comprehensive measurement of the three characteristics of heat, flow and solid of the high-pressure gas storage medium. In addition, before the measurement experiment, the measurement system is cleaned with inert gas to reduce the influence of impurities on the measurement results. In addition, the preheating unit is controlled to adjust the temperature of the gas storage medium, and the high-pressure circulation pump and the back pressure valve are also adjusted to keep the gas storage medium in the set flow pressure state, so as to obtain the measurement results under different working conditions and ensure the accuracy of the measurement data.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0030] Figure 1 A block diagram of a thermal fluid-solid coupling characteristic measurement system for a high-pressure gas storage medium in a channel provided by an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of the connection of a system for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage medium in a channel provided by an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the suction stroke and discharge stroke of the plunger pump provided in an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of a preheating unit provided in an embodiment of the present invention;

[0034] Figure 5 A partial schematic diagram of an experimental unit provided in an embodiment of the present invention;

[0035] Figure 6 A schematic diagram of the arrangement of a temperature detection unit and a strain detection unit provided in an embodiment of the present invention;

[0036] Figure 7 This is a flow chart of a method for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage medium in a channel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the embodiments of the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the embodiments of the present invention as detailed in the appended claims.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. It should also be understood that the term "and / or" used in the present invention refers to and includes any or all possible combinations of one or more associated listed items.

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0041] The present invention provides a system and method for measuring the thermal-fluid-solid coupling characteristics of a high-pressure gas storage medium in a channel, so as to achieve comprehensive measurement of the thermal, fluid and solid characteristics of the high-pressure gas storage medium and ensure the accuracy of the measurement data.

[0042] Figure 1 The block diagram of a thermal fluid-solid coupling characteristic measurement system for a high-pressure gas storage medium in a channel provided by an embodiment of the present invention. The thermal fluid-solid coupling characteristic measurement system for a high-pressure gas storage medium in a channel in the present invention can be referred to as a measurement system. Figure 1 As shown, the thermal-fluid-solid coupling characteristic measurement system of the high-pressure gas storage medium in the channel includes a low-temperature coolant circulation pump, a storage tank, a high-pressure circulation pump, a preheating unit, an electromagnetic three-way valve, a mass flow meter, an experimental unit, a pressure sensor, a differential pressure gauge, a strain detection unit, a temperature detection unit, a cooling unit, a back pressure valve, and a data collection system.

[0043] In this embodiment, the preheating unit includes a preheating section pipeline; the experimental unit includes an experimental section pipeline. The storage tank is connected to the inlet of the preheating section pipeline via a high-pressure circulation pump, the outlet of the preheating section pipeline is connected to the inlet of the experimental section pipeline via an electromagnetic three-way valve, and the outlet of the experimental section pipeline is connected to the storage tank via a cooling unit and a back pressure valve to obtain a closed circulation system. The mass flow meter and the pressure sensor are arranged on the pipeline between the electromagnetic three-way valve and the inlet of the experimental section pipeline, the differential pressure gauge is connected to the inlet and outlet of the experimental section pipeline, the strain detection unit is arranged on the experimental section pipeline, the temperature detection unit is arranged on the experimental section pipeline, and the differential pressure gauge, the strain detection unit and the temperature detection unit are respectively connected to the data collection system.

[0044] In this embodiment, before the measurement experiment, the measurement system is cleaned with inert gas, and the inert gas is discharged through the electromagnetic three-way valve; during the measurement experiment, the low-temperature coolant circulation pump cools the gas storage medium in the storage tank to a liquid state, the high-pressure circulation pump pumps the gas storage medium in the storage tank to the preheating unit, the preheating unit adjusts the temperature of the gas storage medium, and the electromagnetic three-way valve sends the gas storage medium output by the preheating unit to the experimental unit; the experimental unit heats the gas storage medium; the mass flow meter is used to detect the mass flow rate of the gas storage medium entering the experimental unit, the pressure sensor and the differential pressure gauge are used to measure the pressure difference of the gas storage medium, the strain detection unit and the temperature detection unit are used to detect the stress and the temperature of the pipeline wall of the experimental unit and send them to the data collection system, the cooling unit cools the gas storage medium output by the experimental unit, and the gas storage medium output by the cooling unit reaches the storage tank through the back pressure valve, wherein the high-pressure circulation pump and the back pressure valve are regulated so that the gas storage medium maintains the set flow pressure state.

[0045] In this embodiment, the measurement system further includes a pressure stabilizing tank and a check valve, and the high-pressure circulation pump is connected to the inlet of the preheating section pipeline via the pressure stabilizing tank and the check valve. That is, the high-pressure circulation pump pumps the gas storage medium in the storage tank to the pressure stabilizing tank, and then reaches the preheating unit via the check valve.

[0046] In some embodiments, taking the inert gas as nitrogen, Figure 2 A schematic diagram of the connection of a system for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage medium in a channel provided by an embodiment of the present invention.

[0047] like Figure 2 As shown, the first inlet of the storage tank is connected to the high-pressure gas cylinder of the gas storage medium, the first inlet of the storage tank is also connected to the nitrogen gas cylinder, and the outlet of the storage tank is connected to the inlet of the preheating section pipeline (referred to as the preheating section) through a high-pressure circulation pump, a pressure stabilizing tank and a check valve. The outlet of the preheating section is connected to the left inlet of the electromagnetic three-way valve. The lower outlet of the electromagnetic three-way valve is connected to the inlet of the experimental section pipeline (referred to as the experimental section). The outlet of the experimental section is connected to the second inlet of the storage tank through the cooling section pipeline of the cooling unit (referred to as the cooling section) and the back pressure valve. The right outlet of the electromagnetic three-way valve is an exhaust hole. The right inlet of the electromagnetic three-way valve is connected to a vacuum pump. A mass flow meter and a pressure sensor are arranged on the pipeline between the lower outlet of the electromagnetic three-way valve and the inlet of the experimental section. The pressure sensor is close to the inlet side of the experimental section. The differential pressure gauge connects the inlet and outlet of the experimental section. The storage tank cools the gas storage medium in the storage tank through the corresponding low-temperature coolant circulation pump. The cooling section cools the gas storage medium output from the experimental section through the corresponding low-temperature coolant circulation pump.

[0048] In some embodiments, the high-pressure circulation pump may be, for example, a high-pressure plunger pump. Figure 3 Schematic diagram of the suction stroke and discharge stroke of the plunger pump provided in an embodiment of the present invention. Figure 3As shown in the figure, after the target flow is input on the control panel of the data collection system, the high-pressure plunger pump will adjust the flow rate by controlling the moving speed of the plunger through an electrical signal. For the suction stroke, when the plunger moves backward, the pressure in the pump chamber decreases, and the fluid pressure outside the pump chamber is relatively large, pushing the inlet valve and entering the pump chamber. At this time, the discharge valve remains closed due to the flange restriction; for the discharge stroke, when the plunger moves forward, the pressure in the pump chamber increases, the inlet valve closes and the discharge valve opens, and the liquid is sent out of the pump chamber.

[0049] In this embodiment, the preheating unit includes a preheating section pipeline, a first heating power supply and a resistance wire. The inlet of the preheating section pipeline is connected to a high-pressure circulation pump, the outlet of the preheating section pipeline is connected to an electromagnetic three-way valve, and a resistance wire is wrapped around the periphery of the preheating section pipeline. The resistance wire is connected to the first heating power supply, and the temperature of the gas storage medium is adjusted by controlling the current of the first heating power supply.

[0050] Figure 4 Schematic diagram of a preheating unit provided in an embodiment of the present invention. Figure 4 As shown, the preheating unit includes a preheating section pipeline (referred to as the preheating section), a first heating power supply, a resistance wire, a shell and thermal insulation cotton. The inlet of the preheating section enters a low-temperature fluid, and the outlet outputs a high-temperature fluid. The shell adopts a metal shell, and the preheating section is placed in the metal shell. The resistance wire starts from the inlet side of the preheating section and is wound along the outer circumference of the preheating section to the outlet side of the preheating section. The resistance wire is connected to the first heating power supply. Thermal insulation cotton is arranged in the metal shell, and the thermal insulation cotton wraps the preheating section. The temperature of the high-temperature fluid output by the preheating section can be adjusted by controlling the current of the first heating power supply. The pipeline of the preheating section is S-shaped. In this way, sufficient preheating can be achieved.

[0051] In this embodiment, the experimental unit includes a second heating power supply, a heating guide wire and two fixing devices, which are respectively fixed at the inlet and outlet of the experimental section pipeline. Each fixing device connects the experimental section pipeline and the heating guide wire, and the heating guide wire is connected to the second heating power supply. The heat flux density is controlled by adjusting the current of the second heating power supply.

[0052] Figure 5 This is a partial schematic diagram of the experimental unit provided in the embodiment of the present invention. Figure 5 As shown, the experimental unit includes an experimental section pipeline (referred to as the experimental section), a second heating power supply, two fixing devices and a heating wire. The two fixing devices are respectively fixed at the inlet and outlet of the experimental section. Each fixing device includes a copper sheet electrode, a reinforcing bolt and a nut. There is an experimental section perforation on the copper sheet electrode, the inner diameter of the experimental section perforation is equal to the outer diameter of the experimental section, and the experimental section perforation is used to pass through the experimental section. The reinforcing bolts and nuts are used to fix the heating wire. The heating wire is connected to the second heating power supply. The heat flux density is controlled by adjusting the current of the second heating power supply.

[0053] In this embodiment, the strain detection unit includes a resistance transmitter and a plurality of strain gauges, and the plurality of strain gauges are arranged on the experimental section pipeline of the experimental unit. The temperature detection unit includes a temperature transmitter and a plurality of thermocouples, and the plurality of thermocouples are arranged on the experimental section pipeline. The number of strain gauges is consistent with the number of thermocouples, and the installation position of each thermocouple and a corresponding strain gauge is opposite.

[0054] In some embodiments, taking the number of strain gauges as 3 as an example, Figure 6 Schematic diagram of the arrangement of the temperature detection unit and the strain detection unit provided in the embodiment of the present invention. Figure 6 As shown in the front view, three thermocouples are arranged at equal intervals on the outer wall of the test section, and each thermocouple is connected to a temperature transmitter. Figure 6 As shown in the rear view and side view, three strain gauges are arranged at equal intervals on the outer wall of the test section, each strain gauge is connected to a resistance transmitter. The installation position of each thermocouple and a corresponding strain gauge is symmetrical relative to the axis of the test section.

[0055] In this embodiment, the temperature detection unit further includes a plurality of armored thermocouples, which are arranged at the inlet and outlet sides of the experimental section pipeline. For example, the temperature detection unit further includes two armored thermocouples, which are arranged at the inlet and outlet sides of the experimental section respectively (see Figure 2 ).

[0056] Specifically, combined Figure 2 The gas storage medium cycle process of the thermal fluid-solid coupling characteristic measurement system of the high-pressure gas storage medium in the channel is as follows:

[0057] 1) The gas storage medium flows from the gas storage medium high-pressure gas cylinder into the storage tank, where it is cooled to a liquid state by a low-temperature coolant circulation pump;

[0058] 2) Then it enters the high-pressure circulation pump. The high-pressure circulation pump has the functions of pressurization and circulation, and realizes the function of pressurizing and pumping the gas storage medium. The high-pressure circulation pump pumps the fluid output from the storage tank from a low-pressure state to a high-pressure state, and the back-pressure valve only allows the fluid above the rated pressure to be discharged. Therefore, the pipeline between the high-pressure circulation pump and the back-pressure valve constitutes the high-pressure part of the measuring device. When the high-pressure circulation pump pumps a certain flow of fluid, adjusting the back-pressure valve can make the high-pressure circulation in the system maintain the specified pressure, thereby simulating the high-pressure state of the gas storage medium in the gas storage system;

[0059] 3) The high-pressure circulation pump pumps the gas storage medium into the pressure-sustaining tank, and the pressure-sustaining tank is used to eliminate the flow and pressure fluctuations caused by the working characteristics of the high-pressure circulation pump;

[0060] 4) The gas storage medium flows through the check valve to prevent the fluid from flowing back;

[0061] 5) The gas storage medium enters the preheating section, and the temperature of the fluid before entering the experimental section is adjusted by controlling the current of the power supply (the power supply is the first heating power supply);

[0062] 6) The electromagnetic three-way valve is used to adjust the direction of the gas storage medium. You can choose to close the circulation pipeline or exhaust the gas to empty the system pipeline;

[0063] 7) The gas storage medium flows through the mass flow meter to measure the mass flow rate;

[0064] 8) The gas storage medium flows through the pressure sensor and the differential pressure sensor (i.e., differential pressure gauge) to record the inlet pressure of the fluid before entering the experimental section and the pressure drop lost through the experimental section;

[0065] 9) The inlet temperature of the fluid flowing through the test section is measured by the armored thermocouple arranged at the inlet of the test section;

[0066] 10) The gas storage medium is heated in the experimental section, and the heat flux density is controlled by adjusting the current of the power supply (the power supply is the second heating power supply), and the temperature of the fluid and the strain of the solid pipeline are measured by sensors (i.e., thermocouples and strain gauges) to obtain the thermal-fluid-solid characteristics of the gas storage medium;

[0067] 11) After the gas storage medium flows out of the experimental section, the fluid outlet temperature of the experimental section is measured by the armored thermocouple at the outlet of the experimental section;

[0068] 12) The high-temperature gas storage medium enters the cooling section for cooling, and the temperature is reduced to room temperature;

[0069] 13) After flowing through the back pressure valve, it returns to the storage tank to complete the circulation process, and the whole process forms a closed circulation loop.

[0070] Considering that the measurement of the thermal flow-solid characteristics of high-pressure gas storage working fluid is a complex and critical research work, it is necessary to build an integrated measurement system. The measurement system needs to be equipped with a variety of sensors, including temperature sensors, pressure sensors, mass flow meters and strain sensors, and also needs to have the ability to accurately adjust the pressure, temperature, heating power and mass flow rate, so as to monitor the thermal, flow and solid characteristics of the fluid under different operating conditions. Therefore, the system of the present invention is equipped with a variety of sensors including mass flow meters, pressure sensors, differential pressure gauges, strain detection units, temperature detection units, armored thermocouples and other sensors to achieve thermal flow-solid characteristics measurement. In terms of precise adjustment capability, the system of the present invention is achieved through the adjustment of multiple key variables. Multiple key variables include mass flow rate, inlet temperature, inlet pressure, and heat flux density. The specific control method is as follows:

[0071] (1) Mass flow rate: controlled by a high-pressure circulation pump, and in conjunction with a mass flow meter to measure the fluid mass flow rate. For the high-pressure circulation pump: a high-pressure plunger pump is used, and the fluid delivery is divided into an intake stroke and a discharge stroke. The two strokes circulate back and forth to achieve fluid pumping at a set flow rate. For the mass flow meter: the Coriolis effect is used to measure the flow rate. Specifically, there is a pair of parallel flow channels in the flow meter, and magnetic coils are placed at the outlet and inlet as sensors to measure vibration signals; the fluid is divided into two streams when entering the flow meter. When passing through a bend, the Coriolis force causes a phase difference in the vibration signals at the inlet and outlet. The mass flow rate can be obtained by measuring the phase difference.

[0072] (2) Inlet pressure of the test section: Under the set flow rate, the opening of the back pressure valve is controlled and adjusted (for example, rotated) to adjust the inlet pressure of the test section. The pressure is measured by cooperating with a differential pressure gauge and a pressure gauge, and the pressure is stabilized by a pressure regulating tank. For the back pressure valve: The fluid pressure in the valve is sensed by a combination of a piston and a spring. Once the pressure exceeds the pressure value at a certain opening, the fluid in the valve will push the piston valve, and part of the fluid will flow to the low-pressure side of the system, thereby maintaining a constant pressure on the high-pressure side. For the pressure sensor and the differential pressure gauge: The principles of the pressure sensor and the differential pressure gauge are similar. The fluid pressure or pressure difference is measured by components such as strain gauges, and converted into a standard current signal output. For the pressure regulating tank: The fluid is filled into the air bag or diaphragm, and the compressibility of the gas layer is used to achieve pressure stabilization.

[0073] (3) Inlet temperature of the experimental section: The inlet temperature can be controlled by adjusting the current of the first heating power supply in the preheating section and the armored thermocouple installed at the entrance of the experimental section. For the preheating section: multiple turns of resistance wire are wound around the flow channel and wrapped with insulation cotton to achieve heat insulation. By adjusting the current of the first heating power supply, the temperature of the fluid before entering the experimental section can be controlled (see Figure 4 ). For thermocouples: Thermocouples measure temperature through the thermoelectric effect. By wrapping two metal materials in a metal shell, the fluid heats the thermocouple to generate two different electric potentials. The temperature transmitter converts this potential difference into a standard electrical signal to achieve accurate temperature measurement.

[0074] (4) Heat flux density of the experimental section: controlled by the heating power of the second heating power supply of the experimental section, such as Figure 5 As shown, two copper electrodes are clamped on the experimental section, and the area between the copper electrodes is the heated experimental section, and the current is adjusted by the second heating power supply to achieve heating with different heat flux densities. The copper electrode has a circular hole matching the diameter of the experimental section (i.e., the experimental section is perforated), and the heating wire is fixed to the copper electrode by reinforcing bolts and nuts. This method supports the measurement of the thermal-fluid-solid coupling characteristics of the gas storage working fluid, which are characterized by the wall temperature, inlet pressure and pressure drop and strain of the experimental section respectively. The inlet pressure and pressure drop are measured by pressure and differential pressure sensors, while the measurement details of temperature and strain are as shown in the figure. Figure 6 The experimental section is placed horizontally or vertically. Figure 6 Take horizontal placement as an example. In the front view, the thermocouple is installed along the flow direction, and the temperature measurement signal of the thermocouple is transmitted from the measuring point to the temperature transmitter through the wire, and finally processed and analyzed by the data collection system. In the rear view, the strain gauge is installed along the flow direction, and the resistance signal is transmitted from the strain gauge to the resistance transmitter, and finally processed and analyzed by the data collection system. In the side view, the installation positions of the thermocouple and the strain gauge are relative to each other, ensuring that the wall temperature and strain information of one position can be obtained at the same time; note that in order to make the strain gauge fit the pipe, the measurement position of the test section needs to be polished first, but be careful not to affect the pressure resistance and sealing of the test section. The example shows 3 thermocouples and strain gauges, and the actual number can be increased or decreased as needed.

[0075] The following is an embodiment of the method of the present invention. For details not disclosed in the embodiment of the method of the present invention, please refer to the system embodiment of the present invention. The method embodiment of the present invention proposes a method for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage working medium in a channel. The method for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage working medium in a channel utilizes the thermal fluid-solid coupling characteristics measurement system of the high-pressure gas storage working medium in the channel of the above-mentioned system embodiment. The method for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage working medium in a channel of the present invention can be referred to as a measurement method.

[0076] Figure 7 This is a flow chart of a method for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage medium in a channel provided by an embodiment of the present invention.

[0077] like Figure 7 As shown, the method for measuring the thermal fluid-solid coupling characteristics of the high-pressure gas storage medium in the channel includes:

[0078] Step S101, filling inert gas to clean the thermal fluid-solid coupling characteristic measurement system;

[0079] Step S102, after cleaning is completed, the measurement experiment is started, the gas storage medium is filled into the storage tank and the low-temperature coolant circulation pump is turned on to cool the gas storage medium in the storage tank;

[0080] Step S103, setting a target flow rate, turning on a high-pressure circulation pump, and using the high-pressure circulation pump to keep the flow rate in the pipeline of the thermal fluid-solid coupling characteristic measurement system at the target flow rate;

[0081] Step S104, setting a target inlet pressure, and controlling and adjusting the opening of the back pressure valve so that the pressure sensor is maintained at the target inlet pressure;

[0082] Step S105, setting a target inlet temperature, and adjusting the current of the first heating power supply so that the temperature measurement result of the armored thermocouple at the inlet side of the experimental section pipeline is maintained at the target inlet temperature;

[0083] Step S106, setting a target heat flux density, and adjusting the current of the second heating power source based on the target heat flux density;

[0084] Step S107, recording the detection data corresponding to the mass flow meter, the pressure sensor, the differential pressure gauge, the strain detection unit, and the temperature detection unit, and completing the measurement of the thermal fluid-solid coupling characteristics of the gas storage medium under a single working condition.

[0085] In step S101, after the thermal fluid-solid coupling characteristic measurement system is cleaned with inert gas, the method further includes: filling a gas storage medium to perform secondary cleaning on the thermal fluid-solid coupling characteristic measurement system.

[0086] In step S106, the current of the second heating power supply is adjusted based on the target heat flux density, including: obtaining the current current value of the second heating power supply, calculating the heating power based on the current current value using Ohm's law, calculating the current heat flux density based on the heating power and the cross-sectional area of ​​the experimental section pipeline, and adjusting the current of the second heating power supply until the current heat flux density is equal to the target heat flux density.

[0087] In some embodiments, taking nitrogen as an example of an inert gas, the method for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage medium in a channel specifically includes:

[0088] Step 21: Before the experiment begins, purge the thermal fluid-solid coupling characteristic measurement system (hereinafter referred to as the system) with nitrogen: After connecting the vacuum pump to the exhaust hole of the electromagnetic three-way valve, temporarily close the exhaust hole, open the nitrogen cylinder, and inflate the system; when the system pressure reaches the rated pressure, close the nitrogen cylinder, open the exhaust hole, and use the vacuum pump to extract the nitrogen, and repeat this cycle 2 to 3 times.

[0089] Step 22: Clean the system with gas storage medium: close the exhaust hole, open the gas storage medium high-pressure cylinder, and inflate the system; after the system reaches the rated pressure, close the gas storage medium high-pressure cylinder, open the exhaust hole, and use a vacuum pump to extract the gas storage medium, and cycle 1 to 2 times.

[0090] Step 23: Introduce the gas storage medium and start the experiment: disconnect the vacuum pump, close the exhaust hole and the nitrogen passage, open the gas storage medium high-pressure cylinder, wait until the internal pressure of the system is equivalent to the pressure of the gas storage medium high-pressure cylinder, and close the gas storage medium high-pressure cylinder.

[0091] Step 24: Turn on the low-temperature coolant circulation pump to continuously cool the storage tank and the cooling section to keep the gas storage medium at a low temperature.

[0092] Step 25: Set the target flow rate, turn on the high-pressure circulation pump to adjust the flow rate of the gas storage medium, and observe the flow reading of the mass flow meter until the flow rate displayed by the flow meter is stable and the same as the set target flow rate.

[0093] Step 26: Set the target inlet pressure, adjust the opening of the back pressure valve, and observe the pressure gauge value at the inlet of the test section until the value reaches the specified target inlet pressure and remains stable.

[0094] Step 27: Set the target inlet temperature, turn on the first heating power supply of the preheating section, adjust the current of the first heating power supply, and observe the temperature measurement results of the armored thermocouple at the entrance of the experimental section until the inlet temperature reaches the specified target inlet temperature and remains stable.

[0095] Step 28: Set the target heat flux density, turn on the second heating power supply of the experimental section, adjust the current of the second heating power supply, calculate the heating power according to Ohm's law, and convert it into heat flux density according to the area of ​​the experimental section until the calculated heat flux density is equal to the specified target heat flux density and remains stable.

[0096] Step 29: After the above parameters of the system are stable, record the mass flow rate, pressure differential, stress on the pipeline wall and pipeline wall temperature of the gas storage medium in the experimental section to obtain the wall temperature characteristics, inlet pressure and flow characteristics and strain characteristics, and complete the measurement of the thermal fluid-solid characteristics of the gas storage medium under one working condition.

[0097] Step 30: Change at least one parameter among the target flow rate, target inlet pressure, target inlet temperature and target heat flux density, wait for the working condition to stabilize, measure the heat-fluid-solid characteristics, and cycle to carry out the measurement work of the next working condition.

[0098] Step 31: After the experiment is over, turn off the power supply of the experimental section and the preheating section to stop heating; turn off the high-pressure circulation pump and the low-temperature cooling circulation pump; open the back pressure valve and the exhaust hole to empty the gas storage medium in the system.

[0099] It should be noted that the above explanation of the embodiment of the thermal fluid-solid coupling characteristic measurement system for high-pressure gas storage in a channel is also applicable to the thermal fluid-solid coupling characteristic measurement method for high-pressure gas storage in a channel of this embodiment, which will not be repeated here.

[0100] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0101] In the system and method for measuring the thermal fluid-solid coupling characteristics of the high-pressure gas storage medium in the channel of the embodiment of the present invention, the measuring system includes a low-temperature coolant circulation pump, a storage tank, a high-pressure circulation pump, a preheating unit, an electromagnetic three-way valve, a mass flow meter, an experimental unit, a pressure sensor, a differential pressure gauge, a strain detection unit, a temperature detection unit, a cooling unit, a back pressure valve, and a data collection system; before the measurement experiment, the measurement system is cleaned with an inert gas, and the inert gas is discharged through the electromagnetic three-way valve; during the measurement experiment, the low-temperature coolant circulation pump cools the gas storage medium in the storage tank to a liquid state, and the high-pressure circulation pump pumps the gas storage medium in the storage tank to the preheating unit, and the preheating unit The temperature of the gas storage medium is adjusted, and the electromagnetic three-way valve sends the gas storage medium output by the preheating unit to the experimental unit; the experimental unit heats the gas storage medium; the mass flow meter is used to detect the mass flow of the gas storage medium entering the experimental unit, the pressure sensor and the differential pressure gauge are used to measure the pressure difference of the gas storage medium, the strain detection unit and the temperature detection unit are used to detect the stress on the pipeline wall of the experimental unit and the pipeline wall temperature and send them to the data collection system, the cooling unit cools the gas storage medium output by the experimental unit, and the gas storage medium output by the cooling unit reaches the storage tank through the back pressure valve, wherein the high-pressure circulation pump and the back pressure valve are regulated to keep the gas storage medium in the set flow pressure state. In this case, a circulation loop is obtained by integrating a low-temperature coolant circulation pump, a storage tank, a high-pressure circulation pump, a preheating unit, an electromagnetic three-way valve, a mass flowmeter, an experimental unit, a pressure sensor, a differential pressure gauge, a strain detection unit, a temperature detection unit, a cooling unit, and a back pressure valve. The strain detection unit and the temperature detection unit are used to detect the stress on the pipeline wall and the pipeline wall temperature respectively, and the mass flowmeter, the pressure sensor and the differential pressure gauge are used to detect the flow and pressure difference of the high-pressure gas storage medium, so as to achieve a comprehensive measurement of the three characteristics of heat, flow and solid of the high-pressure gas storage medium. In addition, before the measurement experiment, the measurement system is cleaned with inert gas to reduce the influence of impurities on the measurement results. In addition, the preheating unit is controlled to adjust the temperature of the gas storage medium, and the high-pressure circulation pump and the back pressure valve are also adjusted to keep the gas storage medium in the set flow pressure state, so as to obtain the measurement results under different working conditions and ensure the accuracy of the measurement data.

[0102] The method and system of the present invention can achieve simultaneous measurement of the thermal characteristics, flow characteristics and strain characteristics of high-pressure gas storage fluids, which is helpful to study the influence of the periodic compression behavior and expansion behavior of the gas storage fluid on the structure and material strength of the gas storage fluid channel. The method and system are expected to provide guidance for the structural design, safety monitoring, energy efficiency improvement and other aspects of compressed gas energy storage systems, and be applied and promoted in the engineering technology system of compressed gas energy storage systems, accelerate the promotion and deployment of renewable energy power generation equipment, and promote the development of the energy and power industry. In addition, in order to ensure the safety and effectiveness of the experiment, the system of the present invention has the following key characteristics: selecting high-pressure and high-temperature resistant materials to ensure the stability of the system under extreme working conditions; having good sealing properties to prevent fluid leakage and external contamination; finally, the overall stability of the system must be high to ensure the accuracy and repeatability of the measurement data.

[0103] The accompanying drawings show schematic diagrams of structures according to embodiments disclosed in the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0104] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and the present invention is not limited here.

[0105] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal fluid-solid coupling characteristic measurement system for high-pressure gas storage medium in a channel, characterized in that: Including low-temperature coolant circulation pump, storage tank, high-pressure circulation pump, preheating unit, electromagnetic three-way valve, mass flow meter, experimental unit, pressure sensor, differential pressure gauge, strain detection unit, temperature detection unit, cooling unit, back pressure valve, data collection system; Before the measurement experiment, the measurement system is cleaned with inert gas, and the inert gas is discharged through the electromagnetic three-way valve; during the measurement experiment, the low-temperature coolant circulation pump cools the gas storage medium in the storage tank to a liquid state, the high-pressure circulation pump pumps the gas storage medium in the storage tank to the preheating unit, the preheating unit adjusts the temperature of the gas storage medium, and the electromagnetic three-way valve sends the gas storage medium output by the preheating unit to the experimental unit; the experimental unit heats the gas storage medium; the mass flow meter is used to detect the mass flow of the gas storage medium entering the experimental unit, the pressure sensor and the differential pressure gauge are used to measure the pressure difference of the gas storage medium, the strain detection unit and the temperature detection unit are used to detect the stress and the temperature of the pipeline wall of the experimental unit and send them to the data collection system, the cooling unit cools the gas storage medium output by the experimental unit, and the gas storage medium output by the cooling unit reaches the storage tank through the back pressure valve, wherein the high-pressure circulation pump and the back pressure valve are regulated so that the gas storage medium maintains the set flow pressure state.

2. The thermal fluid-solid coupling characteristic measurement system for high-pressure gas storage in a channel according to claim 1, characterized in that: The preheating unit includes a preheating section pipeline, a first heating power supply and a resistance wire. The inlet of the preheating section pipeline is connected to the high-pressure circulation pump, and the outlet of the preheating section pipeline is connected to the electromagnetic three-way valve. The outer periphery of the preheating section pipeline is wrapped with the resistance wire, and the resistance wire is connected to the first heating power supply. The temperature of the gas storage medium is adjusted by controlling the current of the first heating power supply.

3. The thermal fluid-solid coupling characteristic measurement system for high-pressure gas storage in a channel according to claim 1, characterized in that: The strain detection unit includes a resistance transmitter and a plurality of strain gauges, and the plurality of strain gauges are arranged on the experimental section pipeline of the experimental unit.

4. The thermal fluid-solid coupling characteristic measurement system for high-pressure gas storage in a channel according to claim 3, characterized in that: The temperature detection unit includes a temperature transmitter and a plurality of thermocouples, wherein the plurality of thermocouples are arranged on the experimental section pipeline, the number of strain gauges is consistent with the number of thermocouples, and the installation positions of each thermocouple and a corresponding strain gauge are opposite.

5. The thermal fluid-solid coupling characteristic measurement system for high-pressure gas storage in a channel according to claim 4, characterized in that: The temperature detection unit further includes a plurality of armored thermocouples, which are arranged at the inlet side and the outlet side of the experimental section pipeline.

6. The thermal fluid-solid coupling characteristic measurement system for high-pressure gas storage in a channel according to claim 1, characterized in that: The experimental unit includes a second heating power supply, a heating guide wire and two fixing devices, wherein the two fixing devices are respectively fixed at the inlet and outlet of the experimental section pipeline, each fixing device connects the experimental section pipeline and the heating guide wire, and the heating guide wire is connected to the second heating power supply, and the heat flux density is controlled by adjusting the current of the second heating power supply.

7. The thermal fluid-solid coupling characteristic measurement system for high-pressure gas storage in a channel according to claim 2, characterized in that: It also includes a pressure stabilizing tank and a check valve, and the high-pressure circulation pump is connected to the inlet of the preheating section pipeline through the pressure stabilizing tank and the check valve.

8. A method for measuring thermal fluid-solid coupling characteristics of a high-pressure gas storage medium in a channel based on the thermal fluid-solid coupling characteristics measurement system according to any one of claims 1 to 7, characterized in that: include: Fill in inert gas to clean the thermal fluid-solid coupling characteristic measurement system; After cleaning is completed, the measurement experiment begins, the storage tank is filled with gas storage medium and the low-temperature coolant circulation pump is turned on to cool the gas storage medium in the storage tank; Setting a target flow rate, turning on a high-pressure circulation pump, and using the high-pressure circulation pump to keep the flow rate in the pipeline of the thermal fluid-solid coupling characteristic measurement system at the target flow rate; Setting a target inlet pressure, and controlling and adjusting the opening of the back pressure valve so that the pressure sensor is maintained at the target inlet pressure; Setting a target inlet temperature and adjusting the current of the first heating power supply so that the temperature measurement result of the armored thermocouple at the inlet side of the experimental section pipeline is maintained at the target inlet temperature; Setting a target heat flux density, and adjusting the current of the second heating power source based on the target heat flux density; The detection data corresponding to the mass flow meter, pressure sensor, differential pressure gauge, strain detection unit, and temperature detection unit are recorded to complete the measurement of the thermal fluid-solid coupling characteristics of the gas storage medium under a single working condition.

9. The method for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage medium in a channel according to claim 8, characterized in that: After the thermal fluid-solid coupling characteristic measurement system is cleaned by the inert gas, the method further includes: filling the gas storage medium to perform secondary cleaning on the thermal fluid-solid coupling characteristic measurement system.

10. The method for measuring the thermal fluid-solid coupling characteristics of a high-pressure gas storage medium in a channel according to claim 8, characterized in that: The adjusting the current of the second heating power source based on the target heat flux density comprises: Obtain the current value of the second heating power supply, calculate the heating power based on the current current value using Ohm's law, calculate the current heat flux density based on the heating power and the cross-sectional area of ​​the experimental section pipeline, and adjust the current of the second heating power supply until the current heat flux density is equal to the target heat flux density.

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