A test method and system for a high-pressure section gas supply station

Abstract

This invention discloses a test method and system for a high-pressure gas supply and distribution station. The method includes the following steps: S1: pre-test preparation; S2: test parameter simulation and calculation; S3: gas source pressurization and storage; S4: personnel evacuation; S5: rapid pressurization test. This invention achieves rapid deflation of high-pressure gas by replacing traditional electric detonation valves and high-speed switching valves with rupture discs. This eliminates the regulatory and storage restrictions on pyrotechnics, reducing usage costs and safety risks. Furthermore, relying on the millisecond-level deflation characteristics of rupture discs, it meets the requirements for rapid test response. The rupture disc and sonic nozzle technologies are mature and have no limit on the number of actuations, ensuring long-term stable operation of the equipment. Simultaneously, by replacing sonic nozzles with different throat diameters, combined with critical flow control and precise calculations based on the actual gas state equation, a wide range of pressure increase rate adjustment from 0.1 MPa / ms to 35 MPa / ms can be achieved, with a pressure control accuracy within ±5%, adaptable to test samples of different free volumes.

Description

Technical Field

[0001] This invention relates to the field of high-pressure gas supply and distribution station technology, and in particular to a test method and system for high-pressure gas supply and distribution stations. Background Technology

[0002] In the fields of high-end manufacturing and defense, many core products need to operate under ultra-high pressure and rapid pressurization environments. Therefore, high-pressure section cold flow pressurization tests are necessary to verify their performance reliability under extreme pressure conditions. Existing high-pressure section gas supply and distribution testing technologies mainly use electric explosion valves or high-speed switching valves to achieve rapid opening of high-pressure gas. However, these technologies have significant technical drawbacks: 1. Electric explosion valves are pyrotechnic devices, subject to strict national regulations, laws, and storage conditions, and must be replaced after each test, resulting in high operating costs and significant technical and safety risks; 2. High-speed switching valves operate under ultra-high pressure... Under high flow conditions, the valve core movement response time exceeds hundreds of milliseconds, which cannot meet the test requirements for fast response, and the number of actions is not clearly guaranteed, resulting in poor equipment stability; 3. The existing technology has low control accuracy for the pressure rise rate of the test sample, making it difficult to achieve a wide range of pressure rise rate adjustment, and cannot adapt to the test requirements of test samples with different free volumes of 5ml to 20ml. Moreover, the test process relies heavily on on-site operation and lacks a sound remote measurement and control and interlock protection mechanism, so the test safety and automation level need to be improved; In view of the above, this application proposes a test method and system for a high-pressure gas supply and distribution station. Summary of the Invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a test method and system for a high-pressure gas supply and distribution station.

[0004] The present invention proposes a test method for a high-pressure gas supply and distribution station, comprising the following steps:

[0005] S1: Pre-test preparation: Check the status of each device in the system, confirm that there are no leaks in the pipeline and that the valves are in the initial closed state. Place the test sample in the explosion-proof container and complete the standard flange connection with the pipeline assembly. Select the test gas path through the high-pressure manual needle valve.

[0006] S2: Simulation and calculation of test parameters: Based on the free volume, target pressurization rate and target pressure of the test sample selected in S1, the pre-charge pressure of the high-pressure nitrogen stabilizing tank and the matching throat diameter of the sonic nozzle are obtained through simulation calculation, and the pre-charge pressure of the gas storage cylinder group and the required amount of nitrogen are automatically calculated by the test software.

[0007] S3: Gas source pressurization and storage: Remotely control the diaphragm compressor to start, pressurize the gas storage cylinder group to the pre-charge pressure calculated in S2, and automatically stop the diaphragm compressor after reaching the pressure; remotely control the high-pressure booster pump to start, pressurize the high-pressure nitrogen pressure stabilizing tank to the pre-charge pressure calculated in S2, and automatically stop the high-pressure booster pump and close the gas outlet pneumatic valve after reaching the pressure.

[0008] S4: Personnel Evacuation: After completing the on-site operation, the personnel evacuate the test area to achieve human-machine isolation;

[0009] S5: Rapid pressurization test: When the pressure in front of the rupture disc reaches its burst pressure, the rupture disc ruptures instantly. High-pressure nitrogen enters the test sample after the flow rate is stabilized through the sonic nozzle assembly, realizing rapid pressurization of the test sample. At the same time, the remote measurement and control unit collects the pressure time and displacement time data of the test sample in real time.

[0010] S6: Pressure holding and pressure release: After the pressure in the high-pressure nitrogen pressure stabilizing tank and the test sample reaches equilibrium, the pressure holding stage begins. Under the pressure holding state, the pressure drop is ≤0.5MPa / 10s. After the pressure holding is completed, the high-pressure pneumatic needle valve and exhaust valve are remotely opened to release the nitrogen in the test sample, pipeline, and high-pressure nitrogen pressure stabilizing tank to atmospheric pressure.

[0011] S7: Test Completion and Data Processing: Test personnel enter the site to remove the test specimens, the remote measurement and control unit analyzes the collected test data, compares the measured data with the command data, generates a test report, and stores historical data.

[0012] Preferably, in step S2, the free volume of the test sample is 5 ml to 20 ml, the target pressure increase rate is one of 0.1 MPa / ms to 2.0 MPa / ms, 30 MPa to 60 MPa, 15 MPa / ms to 35 MPa / ms, and 60 MPa to 100 MPa, and the target pressure is 30 MPa to 100 MPa.

[0013] Preferably, the specific logical steps of S2 are as follows:

[0014] S201: Input of basic test parameters and setting of boundary conditions: Input the free volume of the test sample Ve, the target pressurization rate dtdp, and the target charging pressure pe selected in S1 into the test software. At the same time, set the basic boundary conditions of the test: test ambient temperature T=293K, nitrogen specific heat ratio K=1.4, nitrogen gas constant R=297J / kg K, total volume of the high-pressure section downstream pipeline Vp, and volume of the high-pressure nitrogen pressure stabilizing tank V0 = 1L;

[0015] S202: Correction calculation of total pressurization volume of the test sample: Considering the influence of the volume of the pipeline at the rear end of the high-pressure section on the pressurization process, the free volume of the test sample is corrected to obtain the actual total pressurization volume. The formula used for correction is: ,in The total pressurized volume of the test sample and the downstream pipeline. The free volume of the test sample. This refers to the total volume of the pipeline at the rear end of the high-pressure section;

[0016] S203: Density calculation based on the real gas law: Using the van der Waals real gas law, the target pressure of the test sample is calculated. Nitrogen density at time Simultaneously, the nitrogen density under the pre-charge pressure of the high-pressure nitrogen stabilizing tank was calculated. ;

[0017] Its van der Waals equation of state for a real gas is: ,in For gas pressure, For gas density, The molar mass of nitrogen gas is... R is the van der Waals constant for nitrogen, R is the gas constant, and T is the thermodynamic temperature.

[0018] S204: Simulation Calculation of Pre-charge Pressure of High-Pressure Nitrogen Pressure Stabilizer: Based on the law of conservation of mass, the mass of nitrogen reduced in the high-pressure nitrogen pressure stabilizer before and after pressurization is equal to the mass of the test sample and the mass of nitrogen added to the downstream pipeline. A one-dimensional isentropic adiabatic simulation of the pressurization process is performed using simulation software, and the pre-charge pressure of the high-pressure nitrogen pressure stabilizer is calculated iteratively. ;

[0019] The formula used for its law of conservation of mass is: ,in The nitrogen density at the pre-charge pressure of the high-pressure nitrogen pressure stabilizing tank. This refers to the nitrogen density at the equilibrium pressure inside the high-pressure nitrogen pressure stabilizing tank after pressurization. Volume of the high-pressure nitrogen pressure stabilizing tank;

[0020] S205: Simulation Calculation of Sonic Nozzle Matching Throat Diameter: Based on the fact that the high-pressure section pressurization is a univariate isentropic adiabatic process, and combined with the criteria for determining the critical flow state of nitrogen, the throat area of ​​the sonic nozzle that satisfies the target pressurization rate is calculated through simulation iteration. This leads to a matching larynx diameter. ;

[0021] S206: Automatic calculation of pre-charge pressure and required nitrogen quantity for gas storage cylinder group: The test software is based on the mass conservation principle of the nitrogen storage and supply unit in the medium-pressure section, combined with the total nitrogen mass required for high-pressure section pressurization and the volume of the gas storage cylinder group. Under the constraint that the pressure drop of the manifold tank is ≤1.0MPa, the pre-charge pressure of the gas storage cylinder group is automatically calculated. and the total mass of nitrogen required ;

[0022] S207: Simulation Result Verification and Output: The experimental software will use the pre-charge pressure of the high-pressure nitrogen pressure stabilizing tank calculated above. Sonic nozzle matching throat diameter Pre-charge pressure of gas cylinder group and required nitrogen amount The entire pressurization process is integrated and simulated using simulation software to verify that the deviation between the simulated pressurization rate and pressurization time and the target parameters is ≤5%. After verification, a formal test parameter table is output as the basis for subsequent gas source pressurization and test execution. If the deviation exceeds 5%, the process returns to S204 for re-iteration calculation.

[0023] Preferably, in step S205, the formula used in the calculation process is as follows:

[0024] Critical mass flow rate formula: ;

[0025] The formula relating pressurization rate to mass flow rate: ;

[0026] The conversion formula between the throat area and throat diameter of a sonic nozzle: ;

[0027] in This is the critical mass flow rate of nitrogen. The pressure stabilization pressure of the high-pressure nitrogen pressure stabilizing tank. Let be the cross-sectional area of ​​the throat of the sonic nozzle. Here, k is the stagnation temperature, k is the specific heat ratio of nitrogen, and R is the nitrogen gas constant. The target boost rate of the test sample, The density of nitrogen gas at the target pressure of the test sample. Match the throat diameter to the sonic nozzle.

[0028] Preferably, in step S206, the formula used in the calculation process is as follows:

[0029] Mass of nitrogen required for high-pressure section pressurization: ;

[0030] Nitrogen density at pre-charge pressure of the gas storage cylinder group: ;

[0031] Calculation of pre-charge pressure for gas cylinder group: ;

[0032] in The mass of nitrogen required for pressurizing the high-pressure section. The mass of nitrogen remaining in the gas storage cylinder group and pipeline after the test. This refers to the total volume of the gas cylinder group. The pre-charge pressure of the gas storage cylinder group is given by k=1.2, which is the pipeline flow resistance redundancy coefficient.

[0033] Preferably, in step S5, the nitrogen pressurization process is a univariate isentropic adiabatic process, and the mass flow rate is kept constant by maintaining the critical flow state of nitrogen at the sonic nozzle. The critical state determination condition is that the ratio of outlet pressure to stagnation pressure is ≤0.528.

[0034] Preferably, the specific logical steps of S5 are as follows:

[0035] S501: Real-time monitoring and judgment of burst pressure: The remote monitoring and control unit collects the actual pressure at the front end of the burst disc in real time through the pressure transmitter on the pipeline between the high-pressure nitrogen pressure stabilizing tank and the burst disc. The collected data will be compared with the rupture disc design blast pressure. Perform continuous comparison, and the judgment criteria are as follows: When the condition is met, the rupture disc venting process is triggered, and the system enters the rapid pressurization stage; if the condition is not met, the high-pressure booster pump continues to pressurize until the rupture pressure is reached.

[0036] S502: Instantaneous Detonation of Rupture Disc and Critical Flow Start-up of Nitrogen: The rupture disc ruptures instantaneously after reaching the design burst pressure. High-pressure nitrogen enters the sonic nozzle assembly from the high-pressure nitrogen stabilizing tank through the rupture disc. The test system maintains the critical flow state of nitrogen through the sonic nozzle, ensuring a constant nitrogen mass flow rate during pressurization. The criteria for determining critical flow are as follows: ,in For the real-time pressure at the test sample end, The stagnation pressure of the high-pressure nitrogen pressure stabilizing tank;

[0037] S503: Nitrogen gas is introduced into the test sample after being stabilized through a sonic nozzle: The nitrogen gas is maintained in a critical flow state within the sonic nozzle, and the throat area of ​​the matched sonic nozzle is calculated using S205. To achieve constant critical mass flow rate Nitrogen output;

[0038] S504: Real-time control and verification of the pressurization rate of the test sample: During the pressurization process, based on the law of conservation of mass, the pressure change rate inside the test sample is positively correlated with the critical mass flow rate of the injected nitrogen. The core correlation formula used is: ,in The target boost rate of the test sample, The density of nitrogen gas at the target pressure of the test sample. The total pressurized volume of the test sample and the downstream pipeline is M, where M is the molar mass of nitrogen and T is the thermodynamic temperature of the test environment.

[0039] The remote monitoring and control unit uses this formula to verify in real time the deviation between the actual pressurization rate of the test sample and the target value, and the deviation is controlled within ±5% to ensure that the pressurization process meets the test requirements.

[0040] S505: Synchronous Acquisition and Storage of Transient Test Data: During the entire rapid pressurization phase of nitrogen charging of the test sample, the high-speed signal acquisition unit and the remote measurement and control unit work together to achieve high-frequency synchronous acquisition of two types of core transient data through pressure sensors and displacement sensors integrated with the test sample.

[0041] S506: Determination of Pressurization End Point: The pressurization process automatically terminates when the nitrogen pressure in the high-pressure nitrogen pressure stabilizing tank reaches pressure equilibrium with the pressurization pressure in the test sample. The determination condition for pressure equilibrium is as follows: ,in This refers to the actual pressure inside the high-pressure nitrogen pressure stabilizing tank during the later stages of pressurization. The actual filling pressure inside the test sample. To allow for pressure balance tolerance, a pressure of ≤0.5MPa is used. Once pressure balance is achieved, the system automatically switches from the rapid pressurization stage to the pressure holding stage.

[0042] Preferably, in step S3, the pressurization process of the gas storage cylinder group and the high-pressure nitrogen stabilizing tank adopts closed-loop control. The pressure transmitter collects pressure data in real time and feeds it back to the remote measurement and control unit. When the pressure reaches the set value, the corresponding pressurization equipment and pneumatic valve are automatically shut down. If the pressure exceeds the set maximum value, the exhaust valve is automatically opened to release pressure.

[0043] The present invention also proposes a test system for a high-pressure gas supply and distribution station, including a nitrogen storage and supply unit, a high-pressure nitrogen stabilizing tank, an explosion-proof container, a sonic nozzle assembly, a rupture disc assembly, a remote monitoring and control unit, and a pipeline assembly;

[0044] The nitrogen storage and supply unit is used to provide pressurized nitrogen for the high-pressure section test. Its output end is connected to the high-pressure nitrogen stabilizing tank. It includes a diaphragm compressor, a gas storage cylinder group and a high-pressure booster pump. The diaphragm compressor pressurizes the low-pressure nitrogen to 45MPa and stores it in the gas storage cylinder group. The high-pressure booster pump pressurizes the nitrogen in the gas storage cylinder group to 140MPa and delivers it to the high-pressure nitrogen stabilizing tank.

[0045] The high-pressure nitrogen pressure stabilizing tank has a volume of 1L and a maximum working pressure of 140MPa. It is used to store ultra-high pressure nitrogen and provide a stable stabilizing pressure for the test. It is embedded in the explosion-proof wall and fixed by a circular clamp.

[0046] The test sample is placed inside the explosion-proof container to prevent safety accidents during the test;

[0047] The rupture disc assembly is installed on the pipeline between the high-pressure nitrogen pressure stabilizing tank and the test sample to achieve instantaneous deflation of the high-pressure nitrogen. Its rupture pressure is matched with the pre-charge pressure of the high-pressure nitrogen pressure stabilizing tank. Different rupture pressure specifications can be customized for the rupture disc. The deflation time is short and no sparks or fragments are generated after the deflation. The rupture tolerance is ±5%.

[0048] The sonic nozzle assembly is connected in series with the rupture disc assembly. By changing the sonic nozzle with different throat diameters, the mass flow rate of nitrogen is controlled, thereby precisely adjusting the pressure rise rate of the test sample. The throat diameter of the sonic nozzle ranges from 0.17 mm to 10.78 mm.

[0049] The piping assembly includes a high-pressure pneumatic needle valve, a high-pressure manual needle valve, and a high-pressure pipeline. The high-pressure pneumatic needle valve is used to exhaust gas from the pipeline after the test, and the high-pressure manual needle valve is used to switch the test gas path. The inner diameter of the high-pressure pipeline is 14.27 mm, which is suitable for the maximum throat diameter requirement of the sound velocity nozzle. The interface between the test process pipeline and the test specimen is a standard flange connection.

[0050] The remote monitoring and control unit is electrically connected to the nitrogen storage and supply unit, the high-pressure nitrogen stabilizing tank, and the pipeline assembly. It is used for setting test parameters, real-time data acquisition, remote equipment control, and analysis and processing of test data. The remote monitoring and control unit includes an NI synchronous acquisition unit, a PLC controller, an industrial computer, and test software. The NI synchronous acquisition unit can acquire no less than 6 pressure signals and no less than 16 displacement signals. The PLC controller acts as a lower-level machine to realize the logic control and interlock protection of the system equipment. The industrial computer is arranged in the remote monitoring and control hall to achieve human-machine isolation. The test software is developed based on LabVIEW and has the functions of automatic matching and calculation of test parameters, simulation, real-time data acquisition and storage, curve comparison, and one-click generation of test reports. Historical test data can be queried by test date or product number.

[0051] Compared with existing technologies, the beneficial effects of this invention are:

[0052] 1. This invention uses a rupture disc to replace the traditional electric explosion valve and high-speed switching valve to achieve rapid venting of high-pressure gas. The rupture disc is not a pyrotechnic product and is not subject to regulatory, regulatory or special storage conditions. It does not need to be replaced after testing, which greatly reduces the cost of use. At the same time, it avoids the technical and safety risks brought by pyrotechnic products from the root and improves the overall safety of the test.

[0053] 2. This invention relies on the instantaneous detonation characteristics of the rupture disc combined with the critical flow control of the sonic nozzle to achieve millisecond-level rapid pressurization of ultra-high pressure gas. The pressure build-up time can be as short as 1.7ms, which is far superior to the response speed of the high-speed switching valve at the level of hundreds of milliseconds. It can meet the stringent requirements of the test for fast response. Moreover, the rupture disc and sonic nozzle technologies are mature, with high stability of action and no limit on the number of actions, ensuring the long-term reliable operation of the test equipment.

[0054] 3. This invention achieves adjustable pressure ramp rate over a wide range of 0.1MPa / ms to 35MPa / ms by replacing sonic nozzles with different throat diameters, combined with critical mass flow control of a univariate isentropic adiabatic process and precise calculation of the actual gas state equation, with pressure control accuracy within ±5%. It can be adapted to test samples with different free volumes from 5ml to 20ml. At the same time, it is equipped with a remote measurement and control unit to realize fully automatic remote operation of the test process. Combined with a complete closed-loop control and interlock protection mechanism, it reduces on-site manual intervention and greatly improves the automation level and operational safety of the test.

[0055] This invention achieves rapid deflation of high-pressure gas by replacing traditional electric explosion valves and high-speed switching valves with rupture discs. This eliminates the regulatory and storage restrictions on pyrotechnics, reducing usage costs and safety risks. Furthermore, the millisecond-level deflation characteristic of the rupture disc meets the requirements for rapid experimental response. The mature technology of the rupture disc and sonic nozzle, with no limit on the number of actuations, ensures long-term stable operation of the equipment. By replacing sonic nozzles with different throat diameters and combining critical flow control with precise calculations based on the actual gas state equation, a wide range of pressure rise rate adjustment from 0.1 MPa / ms to 35 MPa / ms can be achieved, with a pressure control accuracy within ±5%. This allows for adaptation to test samples with different free volumes. Additionally, a remote monitoring and control unit enables fully automated remote operation of the entire testing process. Combined with a comprehensive closed-loop control and interlocking protection mechanism, on-site manual intervention is reduced, significantly improving the automation level and operational safety of the test. Attached Figure Description

[0056] Figure 1 This is a flowchart of a test method for a high-pressure gas supply and distribution station proposed in this invention;

[0057] Figure 2 This is a block diagram of a test system for a high-pressure gas supply and distribution station proposed in this invention. Detailed Implementation

[0058] The present invention will be further explained below with reference to specific embodiments.

[0059] Example

[0060] Reference Figure 1 This embodiment proposes a test method for a high-pressure gas supply and distribution station, including the following steps:

[0061] S1: Pre-test preparation: Check the status of each device in the system, confirm that there are no leaks in the pipeline and that the valves are in the initial closed state. Place the test sample in the explosion-proof container and complete the standard flange connection with the pipeline assembly. Select the test gas path through the high-pressure manual needle valve.

[0062] S2: Simulation and calculation of test parameters: Based on the free volume, target pressurization rate and target pressure of the test sample selected in S1, the pre-charge pressure of the high-pressure nitrogen stabilizing tank and the matching throat diameter of the sonic nozzle are obtained through simulation calculation, and the pre-charge pressure of the gas storage cylinder group and the required amount of nitrogen are automatically calculated by the test software.

[0063] The free volume of the test sample is 5 ml to 20 ml, the target pressure increase rate is one of 0.1 MPa / ms to 2.0 MPa / ms, 30 MPa to 60 MPa, 15 MPa / ms to 35 MPa / ms and 60 MPa to 100 MPa, and the target pressure is 30 MPa to 100 MPa.

[0064] The specific logical steps are as follows:

[0065] S201: Input of basic test parameters and setting of boundary conditions: Input the free volume of the test sample Ve, the target pressurization rate dtdp, and the target charging pressure pe selected in S1 into the test software. At the same time, set the basic boundary conditions of the test: test ambient temperature T=293K, nitrogen specific heat ratio K=1.4, nitrogen gas constant R=297J / kg K, total volume of the high-pressure section downstream pipeline Vp, and volume of the high-pressure nitrogen pressure stabilizing tank V0 = 1L;

[0066] S202: Correction calculation of total pressurization volume of the test sample: Considering the influence of the volume of the pipeline at the rear end of the high-pressure section on the pressurization process, the free volume of the test sample is corrected to obtain the actual total pressurization volume. The formula used for correction is: ,in The total pressurized volume of the test sample and the downstream pipeline. The free volume of the test sample. This refers to the total volume of the pipeline at the rear end of the high-pressure section;

[0067] S203: Density calculation based on the real gas law: Using the van der Waals real gas law, the target pressure of the test sample is calculated. Nitrogen density at time Simultaneously, the nitrogen density under the pre-charge pressure of the high-pressure nitrogen stabilizing tank was calculated. ;

[0068] Its van der Waals equation of state for a real gas is: ,in For gas pressure, For gas density, The molar mass of nitrogen gas is... R is the van der Waals constant for nitrogen, R is the gas constant, and T is the thermodynamic temperature.

[0069] S204: Simulation Calculation of Pre-charge Pressure of High-Pressure Nitrogen Pressure Stabilizer: Based on the law of conservation of mass, the mass of nitrogen reduced in the high-pressure nitrogen pressure stabilizer before and after pressurization is equal to the mass of the test sample and the mass of nitrogen added to the downstream pipeline. A one-dimensional isentropic adiabatic simulation of the pressurization process is performed using simulation software, and the pre-charge pressure of the high-pressure nitrogen pressure stabilizer is calculated iteratively. ;

[0070] The formula used for its law of conservation of mass is: ,in The nitrogen density at the pre-charge pressure of the high-pressure nitrogen pressure stabilizing tank. This refers to the nitrogen density at the equilibrium pressure inside the high-pressure nitrogen pressure stabilizing tank after pressurization. Volume of the high-pressure nitrogen pressure stabilizing tank;

[0071] S205: Simulation Calculation of Sonic Nozzle Matching Throat Diameter: Based on the fact that the high-pressure section pressurization is a univariate isentropic adiabatic process, and combined with the criteria for determining the critical flow state of nitrogen, the throat area of ​​the sonic nozzle that satisfies the target pressurization rate is calculated through simulation iteration. This leads to a matching larynx diameter. ;

[0072] The formulas used in the calculation process are as follows:

[0073] Critical mass flow rate formula: ;

[0074] The formula relating pressurization rate to mass flow rate: ;

[0075] The conversion formula between the throat area and throat diameter of a sonic nozzle: ;

[0076] in This is the critical mass flow rate of nitrogen. The pressure stabilization pressure of the high-pressure nitrogen pressure stabilizing tank. Let be the cross-sectional area of ​​the throat of the sonic nozzle. Here, k is the stagnation temperature, k is the specific heat ratio of nitrogen, and R is the nitrogen gas constant. The target boost rate of the test sample, The density of nitrogen gas at the target pressure of the test sample. Match the throat diameter to the sonic nozzle;

[0077] S206: Automatic calculation of pre-charge pressure and required nitrogen quantity for gas storage cylinder group: The test software is based on the mass conservation principle of the nitrogen storage and supply unit in the medium-pressure section, combined with the total nitrogen mass required for high-pressure section pressurization and the volume of the gas storage cylinder group. Under the constraint that the pressure drop of the manifold tank is ≤1.0MPa, the pre-charge pressure of the gas storage cylinder group is automatically calculated. and the total mass of nitrogen required ;

[0078] The formulas used in the calculation process are as follows:

[0079] Mass of nitrogen required for high-pressure section pressurization: ;

[0080] Nitrogen density at pre-charge pressure of the gas storage cylinder group: ;

[0081] Calculation of pre-charge pressure for gas cylinder group: ;

[0082] in The mass of nitrogen required for pressurizing the high-pressure section. The mass of nitrogen remaining in the gas storage cylinder group and pipeline after the test. This refers to the total volume of the gas cylinder group. The pre-charge pressure of the gas storage cylinder group is given by k=1.2, which is the pipeline flow resistance redundancy coefficient.

[0083] S207: Simulation Result Verification and Output: The experimental software will use the pre-charge pressure of the high-pressure nitrogen pressure stabilizing tank calculated above. Sonic nozzle matching throat diameter Pre-charge pressure of gas cylinder group and required nitrogen amount The entire pressurization process is integrated and simulated using simulation software to verify that the deviation between the simulated pressurization rate and pressurization time and the target parameters is ≤5%. After verification, a formal test parameter table is output as the basis for subsequent gas source pressurization and test execution. If the deviation exceeds 5%, the process returns to S204 for re-iteration calculation.

[0084] S3: Gas source pressurization and storage: Remotely control the diaphragm compressor to start, pressurize the gas storage cylinder group to the pre-charge pressure calculated in S2, and automatically stop the diaphragm compressor after reaching the pressure; remotely control the high-pressure booster pump to start, pressurize the high-pressure nitrogen pressure stabilizing tank to the pre-charge pressure calculated in S2, and automatically stop the high-pressure booster pump and close the gas outlet pneumatic valve after reaching the pressure.

[0085] The pressurization process of the gas cylinder group and the high-pressure nitrogen stabilizing tank adopts closed-loop control. The pressure transmitter collects pressure data in real time and feeds it back to the remote monitoring and control unit. When the pressure reaches the set value, the corresponding pressurization equipment and pneumatic valve are automatically shut down; if the pressure exceeds the set maximum value, the exhaust valve is automatically opened to release pressure.

[0086] S4: Personnel Evacuation: After completing the on-site operation, the personnel evacuate the test area to achieve human-machine isolation;

[0087] S5: Rapid pressurization test: When the pressure in front of the rupture disc reaches its burst pressure, the rupture disc ruptures instantly. High-pressure nitrogen enters the test sample after the flow rate is stabilized through the sonic nozzle assembly, realizing rapid pressurization of the test sample. At the same time, the remote measurement and control unit collects the pressure time and displacement time data of the test sample in real time.

[0088] The nitrogen pressurization process is a univariate isentropic adiabatic process. The mass flow rate is kept constant by maintaining the critical flow state of nitrogen at the sonic nozzle. The critical state determination condition is that the ratio of outlet pressure to stagnation pressure is ≤0.528.

[0089] The specific logical steps are as follows:

[0090] S501: Real-time monitoring and judgment of burst pressure: The remote monitoring and control unit collects the actual pressure at the front end of the burst disc in real time through the pressure transmitter on the pipeline between the high-pressure nitrogen pressure stabilizing tank and the burst disc. The collected data will be compared with the rupture disc design blast pressure. Perform continuous comparison, and the judgment criteria are as follows: When the condition is met, the rupture disc venting process is triggered, and the system enters the rapid pressurization stage; if the condition is not met, the high-pressure booster pump continues to pressurize until the rupture pressure is reached.

[0091] S502: Instantaneous Detonation of Rupture Disc and Critical Flow Start-up of Nitrogen: The rupture disc ruptures instantaneously after reaching the design burst pressure. High-pressure nitrogen enters the sonic nozzle assembly from the high-pressure nitrogen stabilizing tank through the rupture disc. The test system maintains the critical flow state of nitrogen through the sonic nozzle, ensuring a constant nitrogen mass flow rate during pressurization. The criteria for determining critical flow are as follows: ,in For the real-time pressure at the test sample end, The stagnation pressure of the high-pressure nitrogen pressure stabilizing tank;

[0092] S503: Nitrogen gas is introduced into the test sample after being stabilized through a sonic nozzle: The nitrogen gas is maintained in a critical flow state within the sonic nozzle, and the throat area of ​​the matched sonic nozzle is calculated using S205. To achieve constant critical mass flow rate Nitrogen output;

[0093] S504: Real-time control and verification of the pressurization rate of the test sample: During the pressurization process, based on the law of conservation of mass, the pressure change rate inside the test sample is positively correlated with the critical mass flow rate of the injected nitrogen. The core correlation formula used is: ,in The target boost rate of the test sample, The density of nitrogen gas at the target pressure of the test sample. The total pressurized volume of the test sample and the downstream pipeline is M, where M is the molar mass of nitrogen and T is the thermodynamic temperature of the test environment.

[0094] The remote monitoring and control unit uses this formula to verify in real time the deviation between the actual pressurization rate of the test sample and the target value, and the deviation is controlled within ±5% to ensure that the pressurization process meets the test requirements.

[0095] S505: Synchronous Acquisition and Storage of Transient Test Data: During the entire rapid pressurization phase of nitrogen charging of the test sample, the high-speed signal acquisition unit and the remote measurement and control unit work together to achieve high-frequency synchronous acquisition of two types of core transient data through pressure sensors and displacement sensors integrated with the test sample.

[0096] S506: Determination of Pressurization End Point: The pressurization process automatically terminates when the nitrogen pressure in the high-pressure nitrogen pressure stabilizing tank reaches pressure equilibrium with the pressurization pressure in the test sample. The determination condition for pressure equilibrium is as follows: ,in This refers to the actual pressure inside the high-pressure nitrogen pressure stabilizing tank during the later stages of pressurization. The actual filling pressure inside the test sample. To allow for pressure balance tolerance, a pressure of ≤0.5MPa is used. Once pressure balance is achieved, the system automatically switches from the rapid pressurization stage to the pressure holding stage.

[0097] S6: Pressure holding and pressure release: After the pressure in the high-pressure nitrogen pressure stabilizing tank and the test sample reaches equilibrium, the pressure holding stage begins. Under the pressure holding state, the pressure drop is ≤0.5MPa / 10s. After the pressure holding is completed, the high-pressure pneumatic needle valve and exhaust valve are remotely opened to release the nitrogen in the test sample, pipeline, and high-pressure nitrogen pressure stabilizing tank to atmospheric pressure.

[0098] S7: Test Completion and Data Processing: Test personnel enter the site to remove the test specimens, the remote measurement and control unit analyzes the collected test data, compares the measured data with the command data, generates a test report, and stores historical data.

[0099] Reference Figure 2 This embodiment proposes a test system for a high-pressure gas supply and distribution station, including a nitrogen storage and supply unit, a high-pressure nitrogen stabilizing tank, an explosion-proof container, a sonic nozzle assembly, a rupture disc assembly, a remote monitoring and control unit, and a pipeline assembly;

[0100] The nitrogen storage and supply unit is used to provide pressurized nitrogen for the high-pressure section test. Its output end is connected to the high-pressure nitrogen stabilizing tank. It includes a diaphragm compressor, a gas storage cylinder group and a high-pressure booster pump. The diaphragm compressor pressurizes the low-pressure nitrogen to 45MPa and stores it in the gas storage cylinder group. The high-pressure booster pump pressurizes the nitrogen in the gas storage cylinder group to 140MPa and delivers it to the high-pressure nitrogen stabilizing tank.

[0101] The high-pressure nitrogen pressure stabilizing tank has a volume of 1L and a maximum working pressure of 140MPa. It is used to store ultra-high pressure nitrogen and provide a stable stabilization pressure for the test. It is embedded in the explosion-proof wall and fixed by a circular clamp.

[0102] The test sample is placed in an explosion-proof container to avoid safety accidents during the test;

[0103] The rupture disc assembly is installed on the pipeline between the high-pressure nitrogen pressure stabilizing tank and the test sample to achieve instantaneous deflation of the high-pressure nitrogen. Its rupture pressure is matched with the pre-charge pressure of the high-pressure nitrogen pressure stabilizing tank. Different rupture pressure specifications can be customized. The deflation time is short and no sparks or fragments are generated after the deflation. The rupture tolerance is ±5%.

[0104] The sonic nozzle assembly is connected in series with the rupture disc assembly. By changing the sonic nozzle with different throat diameters, the mass flow rate of nitrogen is controlled, thereby precisely adjusting the pressurization rate of the test sample. The throat diameter of the sonic nozzle ranges from 0.17 mm to 10.78 mm.

[0105] The piping assembly includes a high-pressure pneumatic needle valve, a high-pressure manual needle valve, and a high-pressure pipeline. The high-pressure pneumatic needle valve is used for venting the pipeline after the test, and the high-pressure manual needle valve is used to switch the test gas path. The inner diameter of the high-pressure pipeline is 14.27 mm, which is suitable for the maximum throat diameter requirement of the sound velocity nozzle. The interface between the test process pipeline and the test specimen is a standard flange connection.

[0106] The remote monitoring and control unit is electrically connected to the nitrogen storage and supply unit, the high-pressure nitrogen stabilizing tank, and the pipeline components. It is used for setting test parameters, real-time data acquisition, remote equipment control, and analysis and processing of test data. The remote monitoring and control unit includes an NI synchronous acquisition unit, a PLC controller, an industrial computer, and test software. The NI synchronous acquisition unit can acquire no less than 6 pressure signals and no less than 16 displacement signals. The PLC controller acts as a lower-level machine to realize the logic control and interlock protection of the system equipment. The industrial computer is arranged in the remote monitoring and control hall to achieve human-machine isolation. The test software is developed based on LabVIEW and has the functions of automatic matching and calculation of test parameters, simulation, real-time data acquisition and storage, curve comparison, and one-click generation of test reports. Historical test data can be queried by test date or product number.

[0107] This embodiment achieves rapid deflation of high-pressure gas by replacing traditional electric detonation valves and high-speed switching valves with rupture discs. This not only eliminates the regulatory and storage restrictions on pyrotechnics, reducing usage costs and safety risks, but also leverages the millisecond-level deflation characteristics of rupture discs to meet the requirements of rapid test response. Furthermore, the mature technology of rupture discs and sonic nozzles, with no limit on the number of actuations, ensures long-term stable operation of the equipment. By replacing sonic nozzles with different throat diameters and combining critical flow control with precise calculations based on the actual gas state equation, a wide range of pressure rise rate adjustment from 0.1 MPa / ms to 35 MPa / ms can be achieved, with a pressure control accuracy within ±5%. This allows for compatibility with test samples of different free volumes. In addition, a remote measurement and control unit enables fully automated remote operation of the entire test process. Combined with a comprehensive closed-loop control and interlocking protection mechanism, on-site manual intervention is reduced, significantly improving the automation level and operational safety of the test.

[0108] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A test method for a high-pressure gas supply and distribution station, characterized in that, Includes the following steps: S1: Pre-test preparation: Check the status of each device in the system, confirm that there are no leaks in the pipeline and that the valves are in the initial closed state. Place the test sample in the explosion-proof container and complete the standard flange connection with the pipeline assembly. Select the test gas path through the high-pressure manual needle valve. S2: Simulation and calculation of test parameters: Based on the free volume, target pressurization rate and target pressure of the test sample selected in S1, the pre-charge pressure of the high-pressure nitrogen stabilizing tank and the matching throat diameter of the sonic nozzle are obtained through simulation calculation, and the pre-charge pressure of the gas storage cylinder group and the required amount of nitrogen are automatically calculated by the test software. S3: Gas source pressurization and storage: Remotely control the diaphragm compressor to start, pressurize the gas storage cylinder group to the pre-charge pressure calculated in S2, and automatically stop the diaphragm compressor after reaching the pressure; remotely control the high-pressure booster pump to start, pressurize the high-pressure nitrogen pressure stabilizing tank to the pre-charge pressure calculated in S2, and automatically stop the high-pressure booster pump and close the gas outlet pneumatic valve after reaching the pressure. S4: Personnel Evacuation: After completing the on-site operation, the personnel evacuate the test area to achieve human-machine isolation; S5: Rapid pressurization test: When the pressure in front of the rupture disc reaches its burst pressure, the rupture disc ruptures instantly. High-pressure nitrogen enters the test sample after the flow rate is stabilized through the sonic nozzle assembly, realizing rapid pressurization of the test sample. At the same time, the remote measurement and control unit collects the pressure time and displacement time data of the test sample in real time. S6: Pressure holding and pressure release: After the pressure in the high-pressure nitrogen pressure stabilizing tank and the test sample reaches equilibrium, the pressure holding stage begins. Under the pressure holding state, the pressure drop is ≤0.5MPa / 10s. After the pressure holding is completed, the high-pressure pneumatic needle valve and exhaust valve are remotely opened to release the nitrogen in the test sample, pipeline, and high-pressure nitrogen pressure stabilizing tank to atmospheric pressure. S7: Test Completion and Data Processing: Test personnel enter the site to remove the test specimens, the remote measurement and control unit analyzes the collected test data, compares the measured data with the command data, generates a test report, and stores historical data.

2. The test method for a high-pressure gas distribution station according to claim 1, characterized in that, In S2, the free volume of the test sample is 5 ml to 20 ml, the target pressure increase rate is one of 0.1 MPa / ms to 2.0 MPa / ms, 30 MPa to 60 MPa, 15 MPa / ms to 35 MPa / ms, and 60 MPa to 100 MPa, and the target pressure is 30 MPa to 100 MPa.

3. The test method for a high-pressure gas distribution station according to claim 1, characterized in that, The specific logical steps of S2 are as follows: S201: Input of basic test parameters and setting of boundary conditions: Input the free volume of the test sample Ve, the target pressurization rate dtdp, and the target charging pressure pe selected in S1 into the test software. At the same time, set the basic boundary conditions of the test: test ambient temperature T=293K, nitrogen specific heat ratio K=1.4, nitrogen gas constant R=297J / kg K, total volume of the high-pressure section downstream pipeline Vp, and volume of the high-pressure nitrogen pressure stabilizing tank V0 = 1L; S202: Correction calculation of total pressurization volume of the test sample: Considering the influence of the volume of the pipeline at the rear end of the high-pressure section on the pressurization process, the free volume of the test sample is corrected to obtain the actual total pressurization volume. The formula used for correction is: ,in The total pressurized volume of the test sample and the downstream pipeline. The free volume of the test sample. This refers to the total volume of the pipeline at the rear end of the high-pressure section; S203: Density calculation based on the real gas law: Using the van der Waals real gas law, the target pressure of the test sample is calculated. Nitrogen density at time Simultaneously, the nitrogen density under the pre-charge pressure of the high-pressure nitrogen stabilizing tank was calculated. ; Its van der Waals equation of state for a real gas is: ,in For gas pressure, For gas density, The molar mass of nitrogen gas is... R is the van der Waals constant for nitrogen, R is the gas constant, and T is the thermodynamic temperature. S204: Simulation Calculation of Pre-charge Pressure of High-Pressure Nitrogen Pressure Stabilizer: Based on the law of conservation of mass, the mass of nitrogen reduced in the high-pressure nitrogen pressure stabilizer before and after pressurization is equal to the mass of the test sample and the mass of nitrogen added to the downstream pipeline. A one-dimensional isentropic adiabatic simulation of the pressurization process is performed using simulation software, and the pre-charge pressure of the high-pressure nitrogen pressure stabilizer is calculated iteratively. ; The formula used for its law of conservation of mass is: ,in The nitrogen density at the pre-charge pressure of the high-pressure nitrogen pressure stabilizing tank. This refers to the nitrogen density at the equilibrium pressure inside the high-pressure nitrogen pressure stabilizing tank after pressurization. Volume of the high-pressure nitrogen pressure stabilizing tank; S205: Simulation Calculation of Sonic Nozzle Matching Throat Diameter: Based on the fact that the high-pressure section pressurization is a univariate isentropic adiabatic process, and combined with the criteria for determining the critical flow state of nitrogen, the throat area of ​​the sonic nozzle that satisfies the target pressurization rate is calculated through simulation iteration. This leads to a matching larynx diameter. ; S206: Automatic calculation of pre-charge pressure and required nitrogen quantity for gas storage cylinder group: The test software is based on the mass conservation principle of the nitrogen storage and supply unit in the medium-pressure section, combined with the total nitrogen mass required for high-pressure section pressurization and the volume of the gas storage cylinder group. Under the constraint that the pressure drop of the manifold tank is ≤1.0MPa, the pre-charge pressure of the gas storage cylinder group is automatically calculated. and the total mass of nitrogen required ; S207: Simulation Result Verification and Output: The experimental software will use the pre-charge pressure of the high-pressure nitrogen pressure stabilizing tank calculated above. Sonic nozzle matching throat diameter Pre-charge pressure of gas cylinder group and required nitrogen amount The entire pressurization process is integrated and simulated using simulation software to verify that the deviation between the simulated pressurization rate and pressurization time and the target parameters is ≤5%. After verification, a formal test parameter table is output as the basis for subsequent gas source pressurization and test execution. If the deviation exceeds 5%, the process returns to S204 for re-iteration calculation.

4. The test method for a high-pressure gas distribution station according to claim 3, characterized in that, In step S205, the formula used in the calculation process is as follows: Critical mass flow rate formula: ; The formula relating pressurization rate to mass flow rate: ; The conversion formula between the throat area and throat diameter of a sonic nozzle: ; in This is the critical mass flow rate of nitrogen. The pressure stabilization pressure of the high-pressure nitrogen pressure stabilizing tank. Let be the cross-sectional area of ​​the throat of the sonic nozzle. Here, k is the stagnation temperature, k is the specific heat ratio of nitrogen, and R is the nitrogen gas constant. The target boost rate of the test sample, The density of nitrogen gas at the target pressure of the test sample. Match the throat diameter to the sonic nozzle.

5. The test method for a high-pressure gas distribution station according to claim 3, characterized in that, In step S206, the formula used in the calculation process is as follows: Mass of nitrogen required for high-pressure section pressurization: ; Nitrogen density at pre-charge pressure of the gas storage cylinder group: ; Calculation of pre-charge pressure for gas cylinder group: ; in The mass of nitrogen required for pressurizing the high-pressure section. The mass of nitrogen remaining in the gas storage cylinder group and pipeline after the test. This refers to the total volume of the gas cylinder group. The pre-charge pressure of the gas storage cylinder group is given by k=1.2, which is the pipeline flow resistance redundancy coefficient.

6. The test method for a high-pressure gas distribution station according to claim 1, characterized in that, In S5, the nitrogen pressurization process is a univariate isentropic adiabatic process. The mass flow rate is kept constant by maintaining the critical flow state of nitrogen at the sonic nozzle. The critical state determination condition is that the ratio of outlet pressure to stagnation pressure is ≤0.

528.

7. The test method for a high-pressure gas distribution station according to claim 1, characterized in that, The specific logical steps of S5 are as follows: S501: Real-time monitoring and judgment of burst pressure: The remote monitoring and control unit collects the actual pressure at the front end of the burst disc in real time through the pressure transmitter on the pipeline between the high-pressure nitrogen pressure stabilizing tank and the burst disc. The collected data will be compared with the rupture disc design blast pressure. Perform continuous comparison, and the judgment criteria are as follows: When the condition is met, the rupture disc venting process is triggered, and the system enters the rapid pressurization stage; if the condition is not met, the high-pressure booster pump continues to pressurize until the rupture pressure is reached. S502: Instantaneous Detonation of Rupture Disc and Critical Flow Start-up of Nitrogen: The rupture disc ruptures instantaneously after reaching the design burst pressure. High-pressure nitrogen enters the sonic nozzle assembly from the high-pressure nitrogen stabilizing tank through the rupture disc. The test system maintains the critical flow state of nitrogen through the sonic nozzle, ensuring a constant nitrogen mass flow rate during pressurization. The criteria for determining critical flow are as follows: ,in For the real-time pressure at the test sample end, The stagnation pressure of the high-pressure nitrogen pressure stabilizing tank; S503: Nitrogen gas is introduced into the test sample after being stabilized through a sonic nozzle: The nitrogen gas is maintained in a critical flow state within the sonic nozzle, and the throat area of ​​the matched sonic nozzle is calculated using S205. To achieve constant critical mass flow rate Nitrogen output; S504: Real-time control and verification of the pressurization rate of the test sample: During the pressurization process, based on the law of conservation of mass, the pressure change rate inside the test sample is positively correlated with the critical mass flow rate of the injected nitrogen. The core correlation formula used is: ,in The target boost rate of the test sample, The density of nitrogen gas at the target pressure of the test sample. The total pressurized volume of the test sample and the downstream pipeline is M, where M is the molar mass of nitrogen and T is the thermodynamic temperature of the test environment. The remote monitoring and control unit uses this formula to verify in real time the deviation between the actual pressurization rate of the test sample and the target value, and the deviation is controlled within ±5% to ensure that the pressurization process meets the test requirements. S505: Synchronous Acquisition and Storage of Transient Test Data: During the entire rapid pressurization phase of nitrogen charging of the test sample, the high-speed signal acquisition unit and the remote measurement and control unit work together to achieve high-frequency synchronous acquisition of two types of core transient data through pressure sensors and displacement sensors integrated with the test sample. S506: Determination of Pressurization End Point: The pressurization process automatically terminates when the nitrogen pressure in the high-pressure nitrogen pressure stabilizing tank reaches pressure equilibrium with the pressurization pressure in the test sample. The determination condition for pressure equilibrium is as follows: ,in This refers to the actual pressure inside the high-pressure nitrogen pressure stabilizing tank during the later stages of pressurization. The actual filling pressure inside the test sample. To allow for pressure balance tolerance, a pressure of ≤0.5MPa is used. Once pressure balance is achieved, the system automatically switches from the rapid pressurization stage to the pressure holding stage.

8. The test method for a high-pressure gas distribution station according to claim 1, characterized in that, In S3, the pressurization process of the gas storage cylinder group and the high-pressure nitrogen stabilizing tank adopts closed-loop control. The pressure transmitter collects pressure data in real time and feeds it back to the remote measurement and control unit. When the pressure reaches the set value, the corresponding pressurization equipment and pneumatic valve are automatically shut down. If the pressure exceeds the set maximum value, the exhaust valve is automatically opened to release pressure.

9. A test system for a high-pressure gas supply and distribution station, used to implement the method described in any one of claims 1-8, characterized in that, It includes a nitrogen storage and supply unit, a high-pressure nitrogen pressure stabilizing tank, an explosion-proof container, a sonic nozzle assembly, a rupture disc assembly, a remote monitoring and control unit, and pipeline assemblies; The nitrogen storage and supply unit is used to provide pressurized nitrogen for the high-pressure section test. Its output end is connected to the high-pressure nitrogen stabilizing tank. It includes a diaphragm compressor, a gas storage cylinder group and a high-pressure booster pump. The diaphragm compressor pressurizes the low-pressure nitrogen to 45MPa and stores it in the gas storage cylinder group. The high-pressure booster pump pressurizes the nitrogen in the gas storage cylinder group to 140MPa and delivers it to the high-pressure nitrogen stabilizing tank. The high-pressure nitrogen pressure stabilizing tank has a volume of 1L and a maximum working pressure of 140MPa. It is used to store ultra-high pressure nitrogen and provide a stable stabilizing pressure for the test. It is embedded in the explosion-proof wall and fixed by a circular clamp. The test sample is placed inside the explosion-proof container to prevent safety accidents during the test; The rupture disc assembly is installed on the pipeline between the high-pressure nitrogen pressure stabilizing tank and the test sample to achieve instantaneous deflation of the high-pressure nitrogen. Its rupture pressure is matched with the pre-charge pressure of the high-pressure nitrogen pressure stabilizing tank. Different rupture pressure specifications can be customized for the rupture disc. The deflation time is short and no sparks or fragments are generated after the deflation. The rupture tolerance is ±5%. The sonic nozzle assembly is connected in series with the rupture disc assembly. By changing the sonic nozzle with different throat diameters, the mass flow rate of nitrogen is controlled, thereby precisely adjusting the pressure rise rate of the test sample. The throat diameter of the sonic nozzle ranges from 0.17 mm to 10.78 mm. The piping assembly includes a high-pressure pneumatic needle valve, a high-pressure manual needle valve, and a high-pressure pipeline. The high-pressure pneumatic needle valve is used to exhaust gas from the pipeline after the test, and the high-pressure manual needle valve is used to switch the test gas path. The inner diameter of the high-pressure pipeline is 14.27 mm, which is suitable for the maximum throat diameter requirement of the sound velocity nozzle. The interface between the test process pipeline and the test specimen is a standard flange connection. The remote monitoring and control unit is electrically connected to the nitrogen storage and supply unit, the high-pressure nitrogen stabilizing tank, and the pipeline assembly. It is used for setting test parameters, real-time data acquisition, remote equipment control, and analysis and processing of test data. The remote monitoring and control unit includes an NI synchronous acquisition unit, a PLC controller, an industrial computer, and test software. The NI synchronous acquisition unit can acquire no less than 6 pressure signals and no less than 16 displacement signals. The PLC controller acts as a lower-level machine to realize the logic control and interlock protection of the system equipment. The industrial computer is arranged in the remote monitoring and control hall to achieve human-machine isolation. The test software is developed based on LabVIEW and has the functions of automatic matching and calculation of test parameters, simulation, real-time data acquisition and storage, curve comparison, and one-click generation of test reports. Historical test data can be queried by test date or product number.

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