Simulation Analysis Method and System for the Working Process of Gas Injection Accumulator

Abstract

This invention provides a simulation analysis method and system for the working process of a gas-injected accumulator, relating to the technical field of Pogo vibration suppression in liquid-fueled launch vehicles. The method includes: constructing a working simulation model of the gas-injected accumulator using a basic simulation model; determining a simplified flow model at the overflow pipe orifice plate based on the accumulator's structure and operating conditions; and performing transient two-phase flow simulation of the gas-injected accumulator using the working simulation model based on the boundary conditions at the overflow pipe outlet determined by the simplified flow model, thereby obtaining the internal physical property parameter distribution under the accumulator's operating state. The results of this distribution are used to analyze the working characteristics of the gas-injected accumulator, thus achieving simulation analysis of the entire working process of the gas-injected accumulator. This solves the technical problems of incomplete and inaccurate simulation analysis of the accumulator's working process, as well as high computational costs, achieving the technical effects of improving the accuracy of simulation analysis and reducing computational resources.

Description

Technical Field

[0001] This invention relates to the field of Pogo vibration suppression technology for liquid-fueled launch vehicles, and in particular to a simulation analysis method and system for the working process of an injection-type accumulator. Background Technology

[0002] During the launch of large liquid-fueled rockets, the pressure and flow fluctuations in the propulsion system couple with the elastic vibrations of the structure, generating an unstable closed-loop self-excited vibration, commonly known as POGO vibration. Currently, a common method to suppress POGO vibration is to install an accumulator in the liquid oxygen delivery system. Because gas-injection accumulators have strong frequency modulation capabilities and occupy little space, they are better suited to the cryogenic environment of rockets.

[0003] Current research on gas-injected accumulators mainly focuses on theoretical studies and system simulations. However, theoretical studies can only obtain the characteristic parameters of gas-injected accumulators and cannot accurately reflect the actual working process. For the designed gas-injected accumulators, there are no accurate calculation methods for parameters such as flexibility, inertia, and drag coefficient, as well as for liquid level changes and flow discharge during operation.

[0004] CFD simulation is an effective means of obtaining the actual design parameters of gas-injected accumulators. However, due to the high flow velocity and complex flow regime near the overflow outlet (at the overflow pipe orifice plate), existing CFD calculation theories cannot accurately calculate the gas-liquid two-phase-two-component choked flow at the orifice plate. At the same time, the cost of using the complete fluid domain for calculation is unacceptable due to the limitations of mesh size and local flow velocity (i.e., Courant number limitation).

[0005] Current CFD simulation methods for gas-injection accumulators typically simplify the overflow pipe into a single-phase flow or divide the flow outlet into two phases, failing to reflect the impact of complex flow on accumulator performance and neglecting the influence of the complex two-phase flow characteristics of the overflow pipe on the overall operating characteristics of the accumulator. In other words, existing technologies for simulating and analyzing the working process of gas-injection accumulators suffer from technical problems such as insufficient accuracy and completeness, and high computational costs. Summary of the Invention

[0006] The purpose of this invention is to provide a simulation analysis method and system for the working process of an injection-type accumulator, so as to alleviate the technical problems of insufficient and inaccurate simulation analysis of the accumulator working process and high computational cost in the prior art.

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

[0008] In some optional implementations, a working simulation model of the gas-injection accumulator is constructed using a basic simulation model, including: determining a basic simulation model for constructing the working simulation model of the gas-injection accumulator; the basic simulation model includes at least one of a multiphase flow model, a turbulence model, and a phase change model; performing three-dimensional modeling of the accumulator's geometry and fluid domain, and meshing it; and constructing the working simulation model of the gas-injection accumulator using the basic simulation model based on the results of the three-dimensional modeling and meshing.

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

[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 For gas compatibility, v f Let P be the liquid specific volume and P be the pressure.

[0013] In some optional implementations, the above method further includes: using the above-described simplified flow model to calculate and generate the two-phase mass flow rate under the current operating condition and working medium; and using historical experimental data to compare the above-described two-phase mass flow rate under the current operating condition and working medium to verify the above-described simplified flow model.

[0014] In some optional implementations, the internal physical property distribution of the accumulator under the above-mentioned operating conditions includes: pressure distribution, temperature distribution, component content distribution, and gas-liquid interface change rate.

[0015] In some optional implementations, the operating characteristics of the above-mentioned gas-injected 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 gas injection flow rate, temperature, and overflow pipe flow-limiting orifice diameter on the operating stability of the accumulator based on the results of the above-mentioned physical property parameter distribution; and obtaining the accumulator flexibility, drag coefficient, and inertia coefficient based on the results of the above-mentioned physical property parameter distribution to verify the reliability of the accumulator-related design.

[0016] Secondly, embodiments of the present invention provide a simulation analysis system for the working process of a gas-injected accumulator. The system includes: a model building module for constructing a working simulation model of the gas-injected accumulator using a basic simulation model; a model simplification module for determining a simplified flow model at the overflow pipe orifice plate based on the structure and operating conditions of the accumulator; the simplified flow model is used to determine the boundary conditions at the overflow pipe outlet; and a simulation analysis module for performing transient two-phase flow simulation of the gas-injected accumulator using the working simulation model of the gas-injected accumulator based on the boundary conditions at the overflow pipe outlet, to obtain the distribution of internal physical property parameters under the working state of the accumulator; the results of the distribution of the physical property parameters are used to analyze the working characteristics of the gas-injected accumulator.

[0017] Thirdly, embodiments of the present invention provide an electronic device, including a memory and a processor, wherein the memory stores a computer program that can run on the processor, and the processor executes the computer program to implement the steps of the method described in any of the first aspects above.

[0018] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing machine-executable instructions, which, when invoked and executed by a processor, cause the processor to perform the method described in any of the first aspects above.

[0019] This invention provides a simulation analysis method and system for the working process of a gas-injected accumulator. The method includes: constructing a working simulation model of the gas-injected accumulator using a basic simulation model; determining a simplified flow model at the overflow pipe orifice plate based on the accumulator's structure and operating conditions; and performing transient two-phase flow simulation of the gas-injected accumulator using the working simulation model based on the boundary conditions at the overflow pipe outlet determined by the simplified flow model, thereby obtaining the internal physical property parameter distribution of the accumulator under operating conditions. The results of this distribution are used to analyze the working characteristics of the gas-injected accumulator, thus achieving simulation analysis of the entire working process of the gas-injected accumulator. This method solves the technical problems of existing simulation analyses of accumulator working processes being incomplete and inaccurate, and having high computational costs, achieving the technical effects of improving the accuracy of simulation analysis and reducing computational resources. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A flowchart illustrating a simulation analysis method for the working process of an injection-type accumulator provided in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the fluid domain structure of an injection-type 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 an injection-type accumulator provided in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0027] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Some embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] During the launch of large liquid-fueled rockets, the pressure and flow fluctuations in the propulsion system couple with the elastic vibrations of the structure, generating an unstable closed-loop self-excited vibration, commonly known as POGO vibration. Currently, a common method to suppress POGO vibration is to install accumulators in the liquid oxygen delivery system. Gas-injection accumulators offer stronger frequency regulation capabilities, occupy less space, and are better suited to the rocket's cryogenic environment.

[0029] In a gas-injection accumulator, the gas chamber is in direct contact with the propellant without structural isolation. During rocket flight, gas is continuously injected into the accumulator's gas chamber, and excess gas is discharged into the delivery pipe or outside the rocket body through a liquid level control pipe. The gas-liquid interface maintains a dynamic equilibrium near the overflow port. To ensure the normal operation of the gas-injection accumulator, the accumulator's charging flow rate, venting capacity, and pressure change pattern at the accumulator's installation location must be compatible to ensure that the accumulator's working volume meets the design specifications during rocket flight.

[0030] Current research on gas-injected accumulators mainly focuses on theoretical research and system simulation studies. By using the lumped parameter method to perform dynamic modeling of various components of a liquid rocket engine, a dynamic model of the gas-injected accumulator can be obtained. This model can reveal the influence of parameters such as the accumulator's flexibility, inertia, and flow resistance on the engine's POGO stability. Furthermore, system simulations can analyze the impact of different gas-injected accumulator schemes on the frequency characteristics of the propulsion system based on different design parameters.

[0031] However, theoretical studies can only obtain the characteristic parameters of gas-injected accumulators, which are difficult to reflect the actual working process. For the designed gas-injected accumulators, there are no accurate calculation methods for parameters such as flexibility, inertia, and drag coefficient, as well as liquid level changes and flow discharge during operation, which need to be obtained through experiments.

[0032] CFD simulation is an effective means of obtaining the actual design parameters of gas-injection accumulators. However, due to the high flow velocity and complex flow regime at the overflow pipe orifice plate, existing CFD calculation theories cannot accurately calculate the gas-liquid two-phase-two-component choked flow at the orifice plate. Furthermore, the computational cost of using the complete fluid domain is unacceptable due to limitations in mesh size and local flow velocity (i.e., Coulomb number constraints). Therefore, there is currently no complete CFD simulation study of the entire operating process of a gas-injection accumulator from startup to shutdown.

[0033] When pressure pulsations occur in the delivery pipeline causing the liquid level to rise, the amount of gas entering the pipeline through the overflow pipe decreases, the pressure inside the gas cushion increases, and the liquid level drops until it returns to the initial equilibrium position. Conversely, when pressure pulsations cause the liquid level to drop, the amount of gas entering the pipeline through the overflow pipe increases, the pressure inside the gas cushion decreases, 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 maintain the gas cushion volume, change the natural frequency of the pipeline system, and reduce pipeline pulsation pressure. However, the flow regime near the overflow port is extremely complex, consisting of a congested flow of mixed gas and liquid. Flow data at this location can only be obtained through experimental measurements over 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 at the measuring points. However, CFD simulation can obtain specific operating characteristics of the gas-injection accumulator during operation, such as the internal temperature distribution, liquid level fluctuations, gas phase component content and distribution, and overflow pipe flow changes as the operating pressure changes. However, 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 accumulator performance. They ignore the impact of the complex two-phase flow characteristics of the overflow pipe on the overall operating characteristics of the accumulator, and do not perform simulation calculations that combine phase change and flow.

[0035] Based on this, embodiments of the present invention provide a simulation analysis method and system for the working process of a gas-injection accumulator, in order to solve the technical problems that the existing simulation analysis of the working process of a gas-injection accumulator is not complete and accurate enough, and has high computational cost.

[0036] To facilitate understanding of this embodiment, a simulation analysis method for the working process of an injection-type accumulator disclosed in this embodiment of the invention will first be described in detail. (See [link to relevant documentation]). Figure 1 The diagram shows a simulation analysis method for the working process of an injection-type accumulator. This method can be executed by electronic equipment and mainly includes the following steps S110 to S130:

[0037] S110: Construct a working simulation model of a gas-injection accumulator using a basic simulation model;

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

[0039] In one embodiment, step S110, which involves constructing a working simulation model of an injection-type accumulator using a basic simulation model, includes:

[0040] (S111) Determine the basic simulation model used to construct the working simulation model of the gas-injection accumulator;

[0041] (S112) Perform three-dimensional modeling of the accumulator's geometry and fluid domain, and mesh the data;

[0042] That is, the accumulator geometry and fluid domain are determined, modeled, and meshed. In this embodiment, the accumulator geometry and fluid domain can be modeled using 3D software. For the fluid domain structure of the gas injection accumulator, see [link to relevant documentation]. Figure 2 As shown in part (a), the gas-injected accumulator includes: a gas injection port 1, a gas-liquid interface 2, a connecting hole 3, a gas chamber 4, an overflow pipe 5, and an overflow pipe flow-limiting orifice plate 6.

[0043] (S113) Based on the results of 3D modeling and mesh generation, a working simulation model of the gas injection accumulator is constructed using the basic simulation model.

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

[0045] In other words, for the complex two-phase flow process at the overflow pipe orifice plate, a two-phase choke flow model is used to simplify it to pressure boundary conditions. The pressure is determined based on the correlation between flow rate, two-phase content, temperature, and pressure, using the two-phase content, temperature, and two-phase mass flow rate of the upstream flow.

[0046] In one embodiment, step S120, which determines a simplified flow model at the overflow pipe orifice plate based on the accumulator's structure and operating conditions, includes:

[0047] (S121) Based on the structure and operating conditions of the accumulator, obtain 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) Based on the parameters of the upstream flow, the simplified flow model is determined using the two-phase flow calculation formula.

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

[0050] ;(Formula 1)

[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 For gas compatibility, v f Let P be the liquid specific volume and P be the pressure.

[0052] See the simplified fluid domain of the injection-type accumulator using the flow model. Figure 2 As shown in part (b).

[0053] In one embodiment, the method further includes, after step S120, verifying the working simulation model and the simplified flow model of the gas-injection accumulator, respectively. Verification of the simplified flow model may include the following steps:

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

[0055] (S02) The two-phase mass flow rate under the current working condition and working medium is compared using historical experimental data to verify the simplified flow rate model.

[0056] The simplified flow model is Equation (1). Since Equation (1) is a theoretical model, it can be replaced according to different calculation conditions and working media. Therefore, before using it, it is necessary to find relevant 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 operating conditions and working media. Similarly, the main body of the accumulator involves two-phase flow and phase change. The verification of the working simulation model of the gas injection accumulator can be carried out according to the general simulation process.

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

[0058] In one embodiment, the distribution of physical properties inside the accumulator during operation 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 distribution of physical property parameters;

[0061] (2) Based on the results of the distribution of physical property parameters, analyze the effects of gas injection flow rate, temperature, and overflow pipe flow restrictor diameter on the working stability of the accumulator;

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

[0063] This invention provides a simulation analysis method for the working process of a gas-injection accumulator. The method includes: constructing a working simulation model of the gas-injection accumulator using a basic simulation model; determining a simplified flow model at the overflow pipe orifice plate based on the accumulator's structure and operating conditions; and performing transient two-phase flow simulation of the gas-injection accumulator using the working simulation model based on the boundary conditions at the overflow pipe outlet determined by the simplified flow model, thereby obtaining the internal physical property parameter distribution of the accumulator under operating conditions. The results of this distribution are used to analyze the working characteristics of the gas-injection accumulator, thus achieving simulation analysis of the entire working process of the gas-injection accumulator. This method solves the technical problems of existing simulation analyses of accumulator working processes being incomplete and inaccurate, and having high computational costs, achieving the technical effects of improving the accuracy of simulation analysis and reducing computational resources.

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

[0065] (Step 1) Determine the model to be used in the 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 the simulation.

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

[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 for the overflow pipe outlet.

[0068] In other words, the fluid domain of the overflow pipe's orifice plate section is simplified to a pressure outlet boundary condition. Using Fluent's UDF function, the two-phase mass flow rate Gc0, the two-phase mass flow rate ratio x, and the temperature T of the upstream inflow are obtained. Assuming a pressure P0, the partial derivatives of the gas phase vg and the liquid phase specific volume vf at the current pressure P0 are obtained based on the upstream inflow temperature T. and (Relevant physical property data can be obtained from the NIST database), and then the two-phase mass flow rate Gc1 is calculated using the flow formula (1); compare the difference between Gc1 and Gc0, modify the assumed pressure P0, and recalculate the partial derivative of the specific volume with respect to the pressure and the two-phase mass flow rate until the error between the two calculation results is less than a certain value, and then assign the assumed pressure P to the simulated pressure outlet using UDF.

[0069] (Step 4) Verify the simplified flow models for the main body and the overflow pipe orifice plate respectively.

[0070] The simplified flow model is Equation (1). Since Equation (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 relevant 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 operating conditions and working fluids. Similarly, the main body 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-injected accumulator, namely: perform transient two-phase flow simulation of the gas-injected accumulator to obtain the internal pressure distribution, temperature distribution, component content distribution and gas-liquid interface change rate, and overflow flow rate of the accumulator under working conditions.

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

[0073] Based on the calculation results, the overflow pipe discharge flow rate can be obtained, and the effects of air injection flow rate, temperature, and overflow pipe flow restrictor diameter on the working stability of the accumulator can be analyzed to obtain the control law of the air injection accumulator. By setting different pressure changes, it can be analyzed whether the accumulator can meet the design requirements. Based on the simulation results, the accumulator flexibility, resistance coefficient, and inertia coefficient can be obtained, thereby verifying the reliability of the relevant design theory of the accumulator.

[0074] The simulation analysis method for the working process of a gas-injected accumulator provided in this invention obtains the working characteristics of the gas-injected accumulator through CFD simulation. Compared with traditional nonlinear model system simulation methods and experimental methods, CFD simulation can obtain the distribution of component content, velocity field, temperature field and pressure field inside the accumulator, providing a clearer understanding of the accumulator's working state.

[0075] To address the complex two-phase flow at the overflow pipe orifice plate, a theoretical flow model was used as a substitute, enabling successful simulation of the entire operation process of the gas-injected accumulator. This allows for more accurate calculations of the accumulator overflow pipe discharge flow rate, and further calculations can yield more precise characteristic parameters such as accumulator flow resistance, flexibility, and inertia.

[0076] Furthermore, embodiments of the present invention also provide a simulation analysis system for the working process of an injection-type accumulator, see [link to relevant documentation]. Figure 3 As shown, the system includes:

[0077] Model building module 310 is used to build a working simulation model of the gas-injection accumulator using the basic simulation model;

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

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

[0080] The simulation analysis system for the working process of the gas-injection accumulator provided in this application embodiment can be specific hardware on the device or software or firmware installed on the device. The system provided in this application embodiment has the same implementation principle and technical effects as the aforementioned method embodiments. For the sake of brevity, any parts not mentioned in the system embodiment can be referred to the corresponding content in the aforementioned method embodiments. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can all be referred to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. The simulation analysis system for the working process of the gas-injection accumulator provided in this application embodiment has the same technical features as the simulation analysis method for the working process of the gas-injection accumulator provided in the above embodiments, and therefore can solve the same technical problems and achieve the same technical effects.

[0081] This application also provides an electronic device, specifically, the electronic device includes a processor and a storage device; the storage device stores a computer program, and the computer program, when run by the processor, executes the method described in any of the above embodiments.

[0082] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device 400 includes: a processor 40, a memory 41, a bus 42, and a communication interface 43. The processor 40, the communication interface 43, and the memory 41 are connected through the bus 42. The processor 40 is used to execute executable modules, such as computer programs, stored in the memory 41.

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

[0084] Bus 42 can be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 4 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0085] The memory 41 is used to store programs. After receiving an execution instruction, the processor 40 executes the program. The method executed by the apparatus of the process definition disclosed in any of the foregoing embodiments of the present invention can be applied to the processor 40 or implemented by the processor 40.

[0086] Processor 40 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 40 or by instructions in software form. 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 gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this invention can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 41. The processor 40 reads the information in memory 41 and, in conjunction with its hardware, completes the steps of the above method.

[0087] Corresponding to the above method, this application embodiment also provides a computer-readable storage medium storing machine-executable instructions. When the machine-executable instructions are called and run by a processor, the machine-executable instructions cause the processor to perform the steps of the above method.

[0088] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

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

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

[0091] If the aforementioned functions are implemented as 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 this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, electronic device, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0092] It should be noted that similar reference numerals and letters in the accompanying drawings indicate similar items. Therefore, once an item is defined in one accompanying drawing, it does not need to be further defined and explained in subsequent accompanying drawings. In addition, the terms "first," "second," "third," etc. are used only to distinguish descriptions and should not be construed 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, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 an injection-type accumulator, characterized in that, include: A working simulation model of an injection-type accumulator is constructed using a basic simulation model. The gas-injection accumulator includes an overflow pipe and an overflow pipe flow-limiting orifice plate; Based on the accumulator's structure and operating conditions, parameters of the upstream inflow are obtained; these parameters include: two-phase content, temperature, and two-phase mass flow rate; according to these parameters, a simplified flow model at the overflow pipe orifice plate is determined using the two-phase flow rate calculation formula; the two-phase flow rate 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 For gas compatibility, v f Where P is the specific volume of the liquid, and P is the pressure. The simplified flow model is used to calculate and generate the two-phase mass flow rate under the current operating conditions and working fluid; the simplified flow model is verified by comparing the two-phase mass flow rate under the current operating conditions and working fluid using historical experimental data. The simplified flow model is used to determine the boundary conditions at the overflow pipe outlet; Based on the boundary conditions at the overflow pipe outlet, the transient two-phase flow simulation of the gas-injected accumulator is performed using the working simulation model of the gas-injected accumulator to obtain the distribution of internal physical property parameters under the working state of the accumulator; the results of the distribution of physical property parameters are used to analyze the working characteristics of the gas-injected accumulator.

2. The simulation analysis method for the working process of the gas-injection accumulator according to claim 1, characterized in that, A working simulation model of the gas-injection accumulator is constructed using a basic simulation model, including: A basic simulation model is determined for constructing the working simulation model of the gas-injection accumulator; the basic simulation model includes at least one of the following: multiphase flow model, turbulence model, and phase change model. The geometry and fluid domain of the accumulator are modeled in 3D and then meshed. Based on the results of the three-dimensional modeling and mesh generation, a working simulation model of the gas injection accumulator is constructed using the basic simulation model.

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

4. The simulation analysis method for the working process of the gas-injection accumulator according to claim 3, characterized in that, The operating characteristics of the gas-injection accumulator are analyzed, including: Based on the distribution of the aforementioned physical property parameters, the discharge flow rate of the overflow pipe is determined; Based on the results of the physical property parameter distribution, the effects of gas injection flow rate, temperature, and overflow pipe flow restrictor diameter on the accumulator's working stability are analyzed. Based on the distribution of the aforementioned physical property parameters, the accumulator's flexibility, drag coefficient, and inertia coefficient are obtained to verify the reliability of the accumulator's related design.

5. A simulation analysis system for the working process of an injection-type accumulator, characterized in that, The system includes: The model building module is used to build a working simulation model of the gas-injection accumulator using the basic simulation model; the gas-injection accumulator includes an overflow pipe and an overflow pipe flow-limiting orifice plate; The model simplification module is used to obtain the parameters of the upstream inflow based on the structure and operating conditions of the accumulator. These parameters include: two-phase content, temperature, and two-phase mass flow rate. Based on these parameters, a simplified flow model at the overflow pipe orifice plate is determined using the two-phase flow calculation formula. This simplified flow model is used to determine the boundary conditions at the overflow pipe outlet. 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 For gas compatibility, v f Where P is the specific volume of the liquid, and P is the pressure. The model simplification module is also used to calculate using the flow simplification model to generate the two-phase mass flow rate under the current operating conditions and working medium; and to compare the two-phase mass flow rate under the current operating conditions and working medium using historical experimental data to verify the flow simplification model; The simulation analysis module is used to perform transient two-phase flow simulation of the gas-injected accumulator based on the boundary conditions of the overflow pipe outlet and the working simulation model of the gas-injected accumulator, so as to obtain the distribution of internal physical property parameters under the working state of the accumulator; the results of the distribution of physical property parameters are used to analyze the working characteristics of the gas-injected accumulator.

6. An electronic device comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores machine-executable instructions that, when invoked and executed by a processor, cause the processor to perform the method according to any one of claims 1 to 4.

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