Simulation analysis method and system for working process of gas injection type pressure accumulator

Abstract

The invention provides a simulation analysis method and system for the working process of a gas injection type pressure accumulator, and relates to the technical field of liquid carrier rocket Pogo vibration suppression, and the method comprises the steps: building a gas injection type pressure accumulator working simulation model through a basic simulation model; based on the structure and the working condition of the pressure accumulator, determining a flow simplified model at the flow limiting orifice plate of the overflow pipe; according to boundary conditions of an overflow pipe outlet determined by the flow simplification model, transient two-phase flow simulation of the gas injection type pressure accumulator is conducted through the gas injection type pressure accumulator working simulation model, internal physical property parameter distribution of the pressure accumulator in the working state is obtained, the distribution result is used for analyzing the working characteristics of the gas injection type pressure accumulator, and the working characteristics of the gas injection type pressure accumulator are analyzed. Therefore, the simulation analysis of the whole working process of the gas injection type pressure accumulator is realized, the technical problems that the simulation analysis of the working process of the pressure accumulator is not complete and accurate enough and the calculation cost is high are solved, and the technical effects of improving the accuracy of the simulation analysis and reducing calculation resources are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of liquid launch vehicle Pogo vibration suppression, and in particular to a simulation analysis method and system for a working process of a gas injection type accumulator. Background Art

[0002] During the launch of a large liquid-propellant rocket, the pressure and flow pulsation of the propulsion system coupled with the elastic vibration of the structure will produce an unstable closed-loop self-excited vibration, commonly known as POGO vibration. The commonly used method to suppress POGO vibration is to install an accumulator in the liquid oxygen delivery system. Since the gas-injected accumulator has the characteristics of strong frequency modulation capability and small space occupation, it can better adapt to the low temperature environment of the rocket.

[0003] At present, most of the research on gas injection accumulators is theoretical research and system simulation research. However, theoretical research can only obtain the characteristic parameters of gas injection accumulators, which is difficult to reflect the actual working process. For the designed gas injection accumulators, there is no accurate calculation method for its flexibility, inertia, resistance coefficient and other parameters, liquid level changes during operation, flow discharge, etc.

[0004] CFD simulation is an effective means to obtain the actual design parameters of the gas injection accumulator. However, due to the high velocity and complex flow pattern of the flow process near the overflow port (at the overflow pipe flow limiting orifice), the existing CFD calculation theory cannot accurately calculate the gas-liquid two-phase-two-component congestion flow at the orifice. At the same time, due to the limitations of the grid size and local flow velocity (i.e., Courant number limitation), the cost of using the entire fluid domain for calculation is unacceptable.

[0005] The existing CFD simulation methods for gas injection accumulators usually simplify the overflow pipe into a single-phase flow or divide the flow outlet into two phases, which cannot reflect the impact of complex flow on the performance of the accumulator and ignores the impact of the complex two-phase flow characteristics of the overflow pipe on the overall working characteristics of the accumulator. In other words, the existing technology for the simulation analysis of the working process of the gas injection accumulator has technical problems such as insufficient accuracy and completeness, and high calculation cost. Summary of the invention

[0006] The purpose of the present invention is to provide a simulation analysis method and system for the working process of a gas injection accumulator, so as to alleviate the technical problems existing in the prior art that the simulation analysis of the working process of the accumulator is not complete and accurate and has high calculation cost.

[0007] In the first aspect, an embodiment of the present invention provides a simulation analysis method for the working process of an injected gas accumulator, the method comprising: constructing an injected gas accumulator working simulation model using a basic simulation model; determining a simplified flow model at the overflow pipe limiting orifice based on the structure and working conditions of the accumulator; the simplified flow model is used to determine the boundary conditions of the overflow pipe outlet; according to the boundary conditions of the overflow pipe outlet, the injected gas accumulator working simulation model is used to perform transient two-phase flow simulation of the injected gas accumulator to obtain the internal physical property parameter distribution under the accumulator working state; the results of the physical property parameter distribution are used to analyze the working characteristics of the injected gas accumulator.

[0008] In some optional implementations, a basic simulation model is used to construct a working simulation model of an injected gas accumulator, including: determining a basic simulation model for constructing the working simulation model of an injected gas accumulator; the basic simulation model includes at least one of a multiphase flow model, a turbulence model, and a phase change model; three-dimensionally modeling the geometric structure and fluid domain of the accumulator, and dividing the mesh; based on the results of the above three-dimensional modeling and meshing, using the basic simulation model to construct a working simulation model of an injected gas accumulator.

[0009] In some optional implementations, the above-mentioned gas injection accumulator includes an overflow pipe and an overflow pipe limiting orifice; based on the structure and operating conditions of the accumulator, a simplified flow model at the overflow pipe limiting orifice is determined, including: based on the structure and operating conditions of the accumulator, obtaining parameters of the upstream flow; the above-mentioned upstream flow parameters include: two-phase content, temperature, two-phase mass flow rate; based on the above-mentioned upstream flow parameters, the simplified flow model is determined using the two-phase flow calculation formula.

[0010] In some optional implementations, the above two-phase flow calculation formula includes:

[0011]

[0012] Where Gc is the two-phase mass flow rate, x is the ratio of the gas phase mass flow rate to the two-phase mass flow rate, and v g is the gas volume, v f is the liquid specific volume and P is the pressure.

[0013] In some optional implementations, the method further includes: using the simplified flow model to perform calculations to generate the two-phase mass flow under the current operating conditions and the working fluid; using historical experimental data to compare the two-phase mass flow under the current operating conditions and the working fluid to verify the simplified flow model.

[0014] In some optional implementations, the distribution of internal physical parameters of the accumulator in the working state includes: pressure distribution, temperature distribution, component content distribution and gas-liquid interface change rate.

[0015] In some optional implementations, the working characteristics of the above-mentioned gas injection accumulator are analyzed, including: determining the discharge flow rate of the overflow pipe based on the results of the above-mentioned physical property parameter distribution; analyzing the influence of the gas injection flow rate, temperature, and the overflow pipe limiting orifice plate diameter on the working stability of the accumulator based on the results of the above-mentioned physical property parameter distribution; based on the results of the above-mentioned physical property parameter distribution, obtaining the accumulator compliance, resistance coefficient, and inertia coefficient to verify the reliability of the accumulator related design.

[0016] In the second aspect, an embodiment of the present invention provides a simulation and analysis system for the working process of an injected gas accumulator, the system comprising: a model construction module, used to construct an injected gas accumulator working simulation model using a basic simulation model; a model simplification module, used to determine a simplified flow model at the overflow pipe limiting orifice based on the structure and working conditions of the accumulator; the simplified flow model is used to determine the boundary conditions of the overflow pipe outlet; a simulation and analysis module, used to perform transient two-phase flow simulation of the injected gas accumulator using the injected gas accumulator working simulation model according to the boundary conditions of the overflow pipe outlet, and obtain the internal physical property parameter distribution of the accumulator under the working state; the results of the physical property parameter distribution are used to analyze the working characteristics of the injected gas accumulator.

[0017] In a third aspect, an embodiment of the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, and when the processor executes the computer program, the steps of any one of the methods described in the first aspect are implemented.

[0018] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores machine-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions cause the processor to execute any method described in the first aspect above.

[0019] The present invention provides a simulation analysis method and system for the working process of an injected gas accumulator, the method comprising: constructing an injected gas accumulator working simulation model using a basic simulation model; determining a simplified flow model at the overflow pipe flow limiting orifice based on the structure and working conditions of the accumulator; using the injected gas accumulator working simulation model to perform transient two-phase flow simulation of the injected gas accumulator according to the boundary conditions of the overflow pipe outlet determined by the simplified flow model, and obtaining the internal physical parameter distribution of the accumulator under the working state, the distribution result is used to analyze the working characteristics of the injected gas accumulator, thereby realizing the simulation analysis of the entire injected gas accumulator working process. The above method solves the technical problems that the existing simulation analysis of the working process of the accumulator is not complete and accurate, and the calculation cost is high, and achieves the technical effect of improving the accuracy of the simulation analysis and reducing the calculation resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic flow chart of a simulation analysis method for a working process of a gas injection accumulator provided in an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a fluid domain structure of a gas injection accumulator provided in an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the structure of a simulation analysis system for the working process of a gas injection accumulator provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. Some embodiments of the present invention are described in detail below in conjunction with the drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0028] During the launch of a large liquid-propellant rocket, the pressure and flow pulsation of the propulsion system coupled with the elastic vibration of the structure will produce an unstable closed-loop self-excited vibration, commonly known as POGO vibration. The commonly used method to suppress POGO vibration is to install an accumulator in the liquid oxygen delivery system. The gas-injected accumulator has a stronger frequency modulation capability, occupies less space, and can better adapt to the low temperature environment of the rocket.

[0029] The air cavity of the gas injection accumulator is in direct contact with the propellant without structural isolation. During the flight of the rocket, gas is continuously injected into the air cavity of the accumulator. The excess gas is discharged into the delivery pipe or discharged from the outside of the rocket body through the liquid level control pipe, and the gas-liquid interface maintains dynamic balance near the overflow port. In order to ensure the normal operation of the gas injection accumulator, the accumulator's gas flow, discharge capacity, and pressure change law at the accumulator installation position should be adapted to ensure that the accumulator's working volume meets the design index requirements during the rocket flight.

[0030] At present, most of the research on gas-injected accumulators is theoretical research and system simulation research. By using the lumped parameter method to perform dynamic modeling on the components of liquid rocket engines, the dynamic model of the gas-injected accumulator can be obtained, and the influence of the accumulator's flexibility, inertia, flow resistance and other parameters on the engine POGO stability can be obtained. At the same time, system simulation can analyze the influence of different gas-injected accumulator schemes on the frequency characteristics of the power system according to different design parameters.

[0031] However, theoretical research can only obtain the characteristic parameters of the gas injection accumulator, which is difficult to reflect the actual working process. For the designed gas injection accumulator, there is no accurate calculation method for its flexibility, inertia, resistance coefficient and other parameters, as well as the liquid level changes and flow discharge during the working process, which need to be obtained through experiments.

[0032] CFD simulation is an effective means to obtain the actual design parameters of the gas injection accumulator. However, due to the high flow velocity and complex flow state of the flow process at the overflow pipe limiting orifice, the existing CFD calculation theory cannot accurately calculate the gas-liquid two-phase-two-component congestion flow at the orifice. At the same time, it is limited by the grid size and local flow velocity (i.e., Courant number limitation), and the cost of using the complete fluid domain for calculation is unacceptable. Therefore, there is currently no complete CFD simulation study on the complete working process of the gas injection accumulator from startup to shutdown.

[0033] When pressure pulsation occurs in the delivery pipeline, causing the liquid level to rise, the gas entering the delivery pipeline through the overflow pipe decreases, the pressure in the air pillow increases, and the liquid level drops until it returns to the initial equilibrium position. When pressure pulsation in the pipeline causes the liquid level to drop, the amount of gas entering the delivery pipeline through the overflow pipe increases, the air pillow pressure drops, and the liquid level rises until it returns to the initial equilibrium position. Therefore, the overflow pipe of the gas injection accumulator is of great significance for the accumulator to achieve the functions of maintaining the air pillow volume, changing the natural frequency of the pipeline system, and reducing the pulsating pressure of the pipeline. However, the flow state near the overflow port is extremely complex, and it is a congested flow of a mixed gas-liquid. The flow data at this position can only be obtained through experimental measurements to obtain the average value for a period of time.

[0034] Theoretical research and system simulation can only obtain the overall trend of change, and experiments can only obtain the temperature and pressure distribution of the measuring points. However, CFD simulation can obtain the specific working characteristics of the gas injection accumulator during operation, such as the temperature distribution inside the accumulator, the fluctuation of the liquid level, the content and distribution of gas phase components, and the flow change of the overflow pipe as the working pressure changes. However, the existing CFD patents for gas injection accumulators simplify the overflow pipe to single-phase flow or divide the flow outlet into two phases, which cannot reflect the impact of complex flow on the performance of the accumulator, and ignore the impact of the complex two-phase flow characteristics of the overflow pipe on the overall working characteristics of the accumulator. At the same time, there is no simulation calculation combining phase change and flow.

[0035] Based on this, an embodiment of the present invention provides a simulation analysis method and system for the working process of a gas injection accumulator to solve the technical problems in the prior art that the simulation analysis of the working process of a gas injection accumulator is not complete and accurate enough and has high calculation cost.

[0036] To facilitate understanding of this embodiment, a simulation analysis method for the working process of a gas injection accumulator disclosed in an embodiment of the present invention is first described in detail. Figure 1 The flowchart of a simulation analysis method for the working process of a gas injection accumulator is shown in FIG. 1 . The method can be executed by an electronic device and mainly includes the following steps S110 to S130:

[0037] S110: constructing a gas injection type pressurized gas storage working simulation model using the basic simulation model;

[0038] Among them, the basic simulation models may include: multiphase flow model, turbulence model, and phase change model.

[0039] In one embodiment, the step of constructing a gas injection type pressurized gas storage working simulation model using a basic simulation model in S110 includes:

[0040] (S111) determining a basic simulation model for constructing a gas injection type pressurized gas storage working simulation model;

[0041] (S112) performing three-dimensional modeling on the geometric structure and fluid domain of the accumulator and dividing the mesh;

[0042] That is, the geometric structure and fluid domain of the accumulator are determined, modeled and meshed. In this embodiment, the geometric structure and fluid domain of the accumulator can be modeled by three-dimensional software. The fluid domain structure of the gas injection accumulator is shown in Figure 2 As shown in part (a), the gas injection accumulator includes: a gas injection port 1, a gas-liquid interface 2, a connecting hole 3, an air cavity 4, an overflow pipe 5, and an overflow pipe flow limiting orifice plate 6.

[0043] (S113) Based on the results of three-dimensional modeling and meshing, a basic simulation model is used to construct a gas injection type pressurized gas storage working simulation model.

[0044] S120: Based on the structure and working condition of the accumulator, a simplified flow model at the flow limiting orifice plate of the overflow pipe is determined; the simplified flow model is used to determine the boundary conditions of the overflow pipe outlet;

[0045] In other words, for the complex two-phase flow process at the overflow pipe limiting orifice, the two-phase congestion flow model is selected to simplify it into a pressure boundary condition. According to the correlation between flow, two-phase content, temperature and pressure, the pressure is determined according to the two-phase content, temperature, two-phase mass flow rate, etc. of the upstream flow.

[0046] In one embodiment, S120 determines a simplified flow model at a flow limiting orifice of an overflow pipe based on the structure and operating conditions of the accumulator, including:

[0047] (S121) based on the structure and working condition of the accumulator, obtaining the parameters of the upstream flow; the parameters of the upstream flow include: two-phase content, temperature, and two-phase mass flow rate;

[0048] (S122) Determine a simplified flow model using a two-phase flow calculation formula according to the parameters of the upstream flow.

[0049] In one embodiment, the two-phase flow calculation formula includes:

[0050]

[0051] Where Gc is the two-phase mass flow rate, x is the ratio of the gas phase mass flow rate to the two-phase mass flow rate, and v g is the gas volume, v f is the liquid specific volume and P is the pressure.

[0052] The simplified fluid domain of the gas injection accumulator using the flow model is shown in Figure 2 As shown in part (b) of .

[0053] In one embodiment, after step S120, the method further comprises: verifying the air injection type pressure storage gas working simulation model and the simplified flow model respectively. The verification of the simplified flow model may include the following steps:

[0054] (S01) using a simplified flow model to calculate and generate a two-phase mass flow rate under current working conditions and working fluids;

[0055] (S02) Using historical experimental data, the two-phase mass flow rates under current working conditions and working fluids are compared to verify the simplified flow model.

[0056] The simplified flow model is formula (1). Since formula (1) is a theoretical model, it can be replaced according to different calculation conditions and working fluids. Therefore, before using it, it is necessary to find the corresponding experimental literature data to compare and verify the flow calculated by the formula with the experimental data to ensure that the flow formula used is accurate under the current working conditions and working fluids. Similarly, the main part of the accumulator involves two-phase flow and phase change. The verification of the injection type accumulator working simulation model can be carried out according to the general simulation process.

[0057] S130: According to the boundary conditions of the overflow pipe outlet, a transient two-phase flow simulation of the gas injection accumulator is performed using the gas injection accumulator working simulation model to obtain the internal physical property parameter distribution of the accumulator under the working state; the result of the physical property parameter distribution is used to analyze the working characteristics of the gas injection accumulator.

[0058] In one embodiment, the distribution of internal physical parameters of the accumulator in the working state includes: pressure distribution, temperature distribution, component content distribution and gas-liquid interface change rate.

[0059] In one embodiment, the operating characteristics of the gas injection accumulator are analyzed, including:

[0060] (1) Determine the discharge flow rate of the overflow pipe based on the results of the physical property parameter distribution;

[0061] (2) Based on the results of the physical property parameter distribution, the effects of gas injection flow rate, temperature, and overflow pipe limiting orifice diameter on the working stability of the accumulator are analyzed;

[0062] (3) Based on the results of the physical parameter distribution, the accumulator compliance, resistance coefficient, and inertia coefficient are obtained to verify the reliability of the accumulator related design.

[0063] The present invention provides a simulation analysis method for the working process of an injected gas accumulator, the method comprising: constructing an injected gas accumulator working simulation model using a basic simulation model; determining a simplified flow model at the overflow pipe flow limiting orifice based on the structure and working conditions of the accumulator; performing transient two-phase flow simulation of the injected gas accumulator using the injected gas accumulator working simulation model according to the boundary conditions of the overflow pipe outlet determined by the simplified flow model, and obtaining the internal physical parameter distribution of the accumulator under the working state, the distribution result is used to analyze the working characteristics of the injected gas accumulator, thereby realizing the simulation analysis of the entire injected gas accumulator working process. The above method solves the technical problems that the existing simulation analysis of the working process of the accumulator is not complete and accurate, and the calculation cost is high, and achieves the technical effect of improving the accuracy of the simulation analysis and reducing the calculation resources.

[0064] As a specific example, an embodiment of the present invention provides a simulation analysis method for a working process of a gas injection accumulator, comprising the following steps:

[0065] (Step 1) Determine the model used for simulation, including multiphase flow model, turbulence model, phase change model, etc. That is, determine the multiphase flow model, turbulence model and phase change model for simulation.

[0066] (Step 2) Determine the accumulator geometry and fluid domain, model and mesh them.

[0067] (Step 3) Determine and establish boundary conditions based on the accumulator installation location and operating conditions; determine the flow model based on the accumulator operating conditions and working fluid, and write it as a UDF as the boundary condition of the overflow pipe outlet.

[0068] That is, simplify the fluid domain of the flow-limiting orifice of the overflow pipe into a pressure outlet boundary condition, use Fluent's UDF function to obtain the two-phase mass flow rate Gc0, two-phase mass flow ratio x, temperature T, etc. of the upstream flow, and assume a pressure P0, and obtain the partial derivatives of the specific volume vf of the gas phase vg and the liquid phase at the current pressure P0 according to the upstream flow temperature T and (Related physical property data can be obtained through the NIST database), and then the two-phase mass flow rate Gc1 is calculated using the flow formula (1); the difference between Gc1 and Gc0 is compared, the assumed pressure P0 is modified, and the partial derivative of the specific volume with respect to pressure and the two-phase mass flow rate are recalculated until the error between the two calculation results is less than a certain value, and the assumed pressure P is assigned to the simulated pressure outlet using UDF.

[0069] (Step 4) Verify the simplified flow model of the main body and the overflow pipe limiting orifice respectively.

[0070] The simplified flow model is formula (1). Since formula (1) is a theoretical model, it can be replaced according to different calculation conditions and working fluids. Therefore, before using it, it is necessary to find the corresponding experimental literature data to compare and verify the flow calculated by the formula with the experimental data to ensure that the flow formula used is accurate under the current working conditions and working fluids. Similarly, the main part of the accumulator involves two-phase flow and phase change, and the verification here can be carried out according to the general simulation process.

[0071] (Step 5) CFD simulation calculation of the gas injection accumulator, that is: perform transient two-phase flow simulation of the gas injection accumulator to obtain the internal pressure distribution, temperature distribution, component content distribution and gas-liquid interface change rate under the accumulator working state, as well as the discharge flow rate of the overflow pipe, etc.

[0072] (Step 6) Analyze the calculation results and obtain the working characteristics of the gas injection accumulator.

[0073] According to the calculation results, the overflow pipe discharge flow can be obtained, the influence of gas injection flow, temperature, overflow pipe limiting orifice plate diameter on the working stability of the accumulator can be analyzed, and the control law of the gas injection accumulator can be obtained; by setting different pressure changes, it is analyzed whether the accumulator can meet the design requirements; according to the simulation results, the accumulator flexibility, resistance coefficient, and inertia coefficient can be obtained, and then the reliability of the accumulator related design theory can be verified.

[0074] The simulation analysis method of the working process of the gas injection accumulator provided in the embodiment of the present invention obtains the working characteristics of the gas injection accumulator by performing CFD simulation on the gas injection accumulator. Compared with the traditional nonlinear model system simulation method and test method, CFD simulation can obtain the distribution of component content, velocity field, temperature field and pressure field inside the accumulator, and can have a clearer understanding of the working state of the accumulator.

[0075] In view of the complex two-phase flow at the overflow pipe limiting orifice, the theoretical flow model is used to replace it, so that the whole process simulation of the gas injection accumulator can be successfully carried out. It can obtain a more accurate accumulator overflow pipe discharge flow, and at the same time, it can further obtain more accurate accumulator flow resistance, flexibility, inertia and other characteristic parameters through calculation.

[0076] In addition, the embodiment of the present invention also provides a simulation analysis system for the working process of the gas injection accumulator, see Figure 3 As shown, the system includes:

[0077] A model building module 310 is used to build a gas injection type pressure storage gas working simulation model using a basic simulation model;

[0078] The model simplification module 320 is used to determine a simplified flow model at the overflow pipe flow limiting orifice plate based on the structure and working conditions of the accumulator; the simplified flow model is used to determine the boundary conditions of the overflow pipe outlet;

[0079] The simulation analysis module 330 is used to perform transient two-phase flow simulation of the gas injection accumulator according to the boundary conditions of the overflow pipe outlet using the gas injection accumulator working simulation model to obtain the internal physical parameter distribution of the accumulator under the working state; the results of the physical parameter distribution are used to analyze the working characteristics of the gas injection accumulator.

[0080] The simulation and analysis system for the working process of the gas injection accumulator provided in the embodiment of the present application can be specific hardware on the device or software or firmware installed on the device. The implementation principle and technical effects of the system provided in the embodiment of the present application are the same as those of the aforementioned method embodiment. For the sake of brief description, the parts not mentioned in the system embodiment can refer to the corresponding contents in the aforementioned method embodiment. Technical personnel in the relevant field can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices and units described above can all refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. The simulation and analysis system for the working process of the gas injection accumulator provided in the embodiment of the present application has the same technical features as the simulation and analysis method for the working process of the gas injection accumulator provided in the above embodiment, so it can also solve the same technical problems and achieve the same technical effects.

[0081] An embodiment of the present application further provides an electronic device. Specifically, the electronic device includes a processor and a storage device. The storage device stores a computer program, and when the computer program is executed by the processor, it executes the method described in any one of the above-mentioned embodiments.

[0082] Figure 4 A structural schematic diagram of an electronic device provided in an embodiment of the present application, the electronic device 400 includes: a processor 40, a memory 41, a bus 42 and a communication interface 43, wherein the processor 40, the communication interface 43 and the memory 41 are connected via the bus 42; the processor 40 is used to execute an executable module stored in the memory 41, such as a computer program.

[0083] The memory 41 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 43 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used.

[0084] The bus 42 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0085] Among them, the memory 41 is used to store programs, and the processor 40 executes the program after receiving the execution instruction. The method executed by the process definition device disclosed in any embodiment of the above-mentioned embodiment of the present invention can be applied to the processor 40 or implemented by the processor 40.

[0086] The processor 40 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 40. The above processor 40 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiments of the present invention can be directly embodied as a hardware decoding processor to execute, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 41, and the processor 40 reads the information in the memory 41 and completes the steps of the above method in combination with its hardware.

[0087] Corresponding to the above method, an embodiment of the present application also provides a computer-readable storage medium, which stores machine-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions prompt the processor to execute the steps of the above method.

[0088] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0089] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0090] In addition, each functional unit in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0091] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, electronic device, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0092] It should be noted that similar numbers and letters represent similar items in the accompanying drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A simulation analysis method for the working process of a gas injection accumulator, characterized in that: include: Use the basic simulation model to build a simulation model of the air injection type pressurized gas storage operation; Based on the structure and working conditions of the accumulator, a simplified flow model at the overflow pipe limiting orifice is determined; The simplified flow model is used to determine the boundary conditions of the overflow pipe outlet; According to the boundary conditions of the overflow pipe outlet, the transient two-phase flow simulation of the gas injection type accumulator is performed using the gas injection type accumulator working simulation model to obtain the internal physical property parameter distribution of the accumulator under the working state; The results of the physical property parameter distribution are used to analyze the working characteristics of the gas injection accumulator.

2. The simulation analysis method for the working process of the gas injection accumulator according to claim 1 is characterized in that: The basic simulation model is used to build a simulation model of the air injection type pressurized gas storage working, including: Determine a basic simulation model for constructing a gas injection type pressurized gas storage working simulation model; the basic simulation model includes: at least one of a multiphase flow model, a turbulence model, and a phase change model; 3D modeling and meshing of the accumulator's geometric structure and fluid domain; Based on the results of the three-dimensional modeling and meshing, a basic simulation model is used to construct a gas injection type pressurized gas storage working simulation model.

3. The simulation analysis method for the working process of the gas injection accumulator according to claim 1 is characterized in that: The gas injection accumulator comprises an overflow pipe and an overflow pipe flow limiting orifice plate; Based on the structure and working conditions of the accumulator, the simplified flow model at the overflow pipe limiting orifice is determined, including: Based on the structure and working condition of the accumulator, the parameters of the upstream flow are obtained; the parameters of the upstream flow include: two-phase content, temperature, and two-phase mass flow; According to the parameters of the upstream flow, a simplified flow model is determined using a two-phase flow calculation formula.

4. The simulation analysis method for the working process of the gas injection accumulator according to claim 3 is characterized in that: The two-phase flow calculation formula includes: Where Gc is the two-phase mass flow rate, x is the ratio of the gas phase mass flow rate to the two-phase mass flow rate, and v g is the gas volume, v f is the liquid specific volume and P is the pressure.

5. The simulation analysis method for the working process of the gas injection accumulator according to claim 4 is characterized in that: The method further comprises: The simplified flow model is used to calculate and generate the two-phase mass flow under the current working condition and working medium; The historical experimental data are used to compare the two-phase mass flow under the current working condition and the working medium, and the simplified flow model is verified.

6. The simulation analysis method for the working process of the gas injection accumulator according to claim 1 is characterized in that: The distribution of the internal physical property parameters of the accumulator under the working state includes: pressure distribution, temperature distribution, component content distribution and gas-liquid interface change rate.

7. The simulation analysis method for the working process of the gas injection accumulator according to claim 6 is characterized in that: The working characteristics of the gas injection accumulator are analyzed, including: Based on the result of the physical property parameter distribution, determining the discharge flow rate of the overflow pipe; Based on the results of the physical property parameter distribution, the effects of gas injection flow rate, temperature, and overflow pipe limiting orifice diameter on the working stability of the accumulator are analyzed; Based on the results of the physical parameter distribution, the compliance, resistance coefficient and inertia coefficient of the accumulator are obtained to verify the reliability of the accumulator related design.

8. A simulation analysis system for the working process of a gas injection accumulator, characterized in that: The system comprises: A model building module, used to build a gas injection type pressurized gas storage working simulation model using a basic simulation model; A model simplification module is used to determine a simplified flow model at a flow limiting orifice plate of an overflow pipe based on the structure and working conditions of the accumulator; the simplified flow model is used to determine boundary conditions of an overflow pipe outlet; A simulation analysis module is used to perform transient two-phase flow simulation of the gas injection accumulator according to the boundary conditions of the overflow pipe outlet and using the gas injection accumulator working simulation model to obtain the internal physical property parameter distribution of the accumulator under the working state; the results of the physical property parameter distribution are used to analyze the working characteristics of the gas injection accumulator.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores machine-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions cause the processor to execute the method according to any one of claims 1 to 7.

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