Compressible fluid-solid coupling parameter prediction method based on butterfly valve structure

Abstract

The invention belongs to the technical field of aviation environment control design, and provides a compressible fluid-solid coupling parameter prediction method based on a butterfly valve structure, which comprises the following steps: establishing a butterfly valve shell structure model, completing grid division, then establishing a shell and pipeline drainage basin model, completing grid division, establishing a compressible fluid mechanics calculation model, and finally establishing a compressible fluid-solid coupling parameter prediction model. And calculating a steady compressible flow field, setting boundary conditions of a butterfly valve shell, calculating steady fluid-solid coupling, and finally obtaining structural deformation and flow field characteristic data of the butterfly valve. According to the method, the flow field characteristics of the typical butterfly valve structure can be predicted, meanwhile, a reference basis is provided for designing the flow capacity of the valve, and then the design problem of the butterfly valve structure is solved.

Description

Technical Field

[0001] This invention belongs to the field of aerospace environmental control design technology, and relates to a compressible fluid-structure interaction parameterized design method for a typical butterfly valve structure, specifically a compressible fluid-structure interaction parameter prediction method based on the butterfly valve structure. Background Technology

[0002] Predicting the flow capacity of butterfly valves in aviation environmental control systems is a key focus of aviation safety. The operating state of butterfly valves is affected by factors such as inlet pressure, flow rate, and temperature, causing changes in flow resistance, pressure, flow velocity, temperature, and compressibility, thus impacting the safety of the environmental control system. Traditional theoretical calculations are insufficient to predict the coupled changes of multiple factors. Therefore, exploring the compressible fluid-structure interaction characteristics of typical butterfly valve structures has significant practical engineering value and scientific importance.

[0003] Since the 1980s, with the development of computer equipment, computational fluid dynamics has gradually shifted from traditional experimental research and theoretical calculations to a research approach combining numerical and experimental methods, further promoting the study of compressible fluid-structure interaction problems. Currently, research on the flow field characteristics of butterfly valves is limited to theoretical calculations of flow resistance characteristics and experimental detection of flow field pressure, making it difficult to predict the flow field characteristics inside the valve body. The constructed computational models of incompressible single-phase fluids have significant errors in predicting the flow field characteristics of the valve body compared to experiments, and fail to reflect the influence of the flow field on the structural field, thus failing to provide accurate predictions. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a compressible fluid-structure interaction parameter prediction method based on butterfly valve structures. This method can predict the flow field characteristics of typical butterfly valve structures and provide a reference for designing valve flow capacity, thereby solving butterfly valve structure design problems.

[0005] The technical solution of the present invention is as follows: A method for predicting compressible fluid-structure interaction parameters based on a butterfly valve structure includes the following steps: S1. Establish the butterfly valve shell structure model and complete the mesh generation; S2, Establish the shell and pipe flow domain model and complete the mesh generation; S3, Establish a computational model for compressible fluid dynamics; S4, calculate the steady compressible flow field; S5, Set the boundary conditions for the butterfly valve body; S6, calculate steady fluid-structure interaction; S7, obtain data on the structural deformation and flow field characteristics of the butterfly valve.

[0006] Furthermore, S1 specifically involves: for a given butterfly valve shell, using 3D modeling software to create models of the shell's inlet, outlet, inner wall surface, and other irregular outer surface entities; determining and creating the shell model's outlet, inlet, inner wall surface, and fixed surface; setting the mesh size; and using unstructured meshing for partitioning.

[0007] Furthermore, S2 specifically refers to: the shell and pipeline flow domains are the internal flow domain of the butterfly valve shell and the pipeline flow domain connecting the butterfly valve shell outlet. The internal flow domain of the butterfly valve shell is established using 3D modeling software, with a diameter consistent with the inner diameter of the butterfly valve shell and a length consistent with the length of the butterfly valve shell, excluding the valve disc actuation part when fully open; the pipeline flow domain connecting the shell flow domain outlet has a diameter consistent with the diameter of the butterfly valve shell, and a length 10 times the length of the butterfly valve shell; the mesh size is set, and unstructured meshes are used for division.

[0008] Furthermore, S3 specifically includes the following steps: S31, Establish the basic governing equations for the flow field of compressible fluids; S32, Establish a turbulence model for compressible fluids; S33, Establish the structural field control equations for compressible fluids; S34 uses the heat conduction equation to thermodynamically couple the models and equations of S31 to S33.

[0009] Furthermore, S31 specifically refers to: The fundamental governing equations of the flow field include the continuity equation and the momentum equation.

[0010]

[0011] In the formula, This indicates the partial derivative of the function with respect to the corresponding variable, and the subscript is used. i , j Cartesian coordinate system x , y coordinate, u For the incoming flow velocity, p For flow field pressure, ρ m For fluid density, μ m μ is the dynamic viscosity coefficient of the fluid. t The turbulent viscosity coefficient; Based on the fundamental governing equations of the flow field, the single-phase flow of compressible gas is calculated using the ideal gas law:

[0012] In the formula, R is the gas constant and T is the fluid temperature.

[0013] Furthermore, S33 specifically refers to: The structural field governing equations are established using the principle of virtual displacement to derive the element characteristic equations as follows:

[0014] In the formula, [ M s ] is the structural mass matrix, [ C s ] is the structural damping matrix, [ K s [ ] represents the structural stiffness matrix. For structural displacement, For structural speed, For structural acceleration, { F HE} represents the flow field force acting on the structure under fluid-structure interaction, { F EX} represents the external excitation force experienced by the structure under fluid-structure interaction.

[0015] Furthermore, the coupling in S34 is as follows:

[0016] In the formula, ρ is the material density, and c p Q is the specific heat capacity, k is the thermal conductivity, and Q is the specific heat capacity. ext As an external heat source, Q mec Heat is the result of mechanical work.

[0017] Furthermore, in S4, CFD is used, with the inlet pressure and outlet interface of the shell flow domain given, and the inlet interface and outlet velocity of the pipe flow domain given, and the remaining surfaces having a roughness of 1 mm; at the same time, without considering the change of flow field characteristic parameters with time, the fluid temperature is given, and the steady flow field is solved by CFD numerical calculation to obtain the steady numerical calculation results of the flow domain.

[0018] Furthermore, in S5, in the finite element structural solver, the top of the butterfly valve shell structure model obtained in S1 is set as a fixed end, and the inside is avoided as a fluid-structure interaction interface, so as to transfer thermodynamic, dynamic and displacement data with the solver that calculates compressible fluid dynamics.

[0019] Furthermore, S6 specifically includes the following steps: S61 uses the flow field change characteristics as a load on the thermodynamic coupling interface, which is then transferred to the finite element structural solver to discretize the structural heat conduction equation, calculate the temperature change of the butterfly valve shell, and obtain the shell temperature response data. S62 uses the flow field variation characteristics and shell temperature response data as loads on the fluid-structure interaction interface, and transfers them to the finite element structural solver to discretely solve the structural control equations, calculate the structural changes of the butterfly valve shell, and obtain the shell structural response data.

[0020] The beneficial effects of this invention are as follows: This invention enables the prediction of the flow field characteristics of typical butterfly valve structures, and provides a reference for designing valve flow capacity, thereby solving the problem of butterfly valve structure design. Attached Figure Description

[0021] Figure 1 This invention is a compressible fluid-structure interaction parameterized numerical prediction method based on a typical butterfly valve structure.

[0022] Figure 2 This is a schematic diagram of the boundary condition setting for the butterfly valve housing model of the present invention.

[0023] Figure 3 This is a schematic diagram of the shell and pipeline flow domain model and boundary condition settings of the present invention.

[0024] Figure 4 Using this invention, the flow resistance characteristics and shell temperature under constant flow field conditions were obtained as follows: inlet pressure 201.1 kPa (absolute pressure), outlet mass flow rate 800 kg / h, and flow field temperature 299.75 K. These were then compared with experimental and theoretical flow resistance data.

[0025] Figure 5 This is a schematic diagram illustrating the use of the present invention to obtain flow resistance data and shell temperature for Examples 2, 3, and 4, and to compare them with experimental and theoretical flow resistance data calculations. Detailed Implementation

[0026] This section describes embodiments of the present invention, used to explain and illustrate the technical solutions of the present invention. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are based on the orientation or positional relationships in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or case referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include more than one of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integrated connections; they can refer to mechanical connections or point connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Example 1: A method for predicting compressible fluid-structure interaction parameters based on a butterfly valve structure includes the following steps: S1. Establish the butterfly valve shell structure model and complete the mesh generation; S2, Establish the shell and pipe flow domain model and complete the mesh generation; S3, Establish a computational model for compressible fluid dynamics; S4, calculate the steady compressible flow field; S5, Set the boundary conditions for the butterfly valve body; S6, calculate steady fluid-structure interaction; S7, obtain data on the structural deformation and flow field characteristics of the butterfly valve.

[0030] S1 specifically involves: for a given butterfly valve shell, using 3D modeling software to create models of the shell's inlet, outlet, inner wall surface, and other irregular outer surface entities; determining and creating the shell model's outlet, inlet, inner wall surface, and fixed surface; setting the mesh size; and using unstructured meshing for partitioning.

[0031] S2 specifically refers to: the shell and pipeline flow domain, which includes the internal flow domain of the butterfly valve shell and the pipeline flow domain connecting the butterfly valve shell outlet. The internal flow domain of the butterfly valve shell is established using 3D modeling software, with a diameter consistent with the inner diameter of the butterfly valve shell and a length consistent with the length of the butterfly valve shell, excluding the valve disc actuation part when fully open; the pipeline flow domain connecting the shell flow domain outlet has a diameter consistent with the diameter of the butterfly valve shell, and a length 10 times the length of the butterfly valve shell; the mesh size is set, and an unstructured mesh is used for division.

[0032] S3 specifically includes the following steps: S31, Establish the basic governing equations for the flow field of compressible fluids; S32, Establish a turbulence model for compressible fluids; S33, Establish the structural field control equations for compressible fluids; S34 uses the heat conduction equation to thermodynamically couple the models and equations of S31 to S33.

[0033] S31 specifically refers to: The fundamental governing equations of the flow field include the continuity equation and the momentum equation.

[0034]

[0035] In the formula, This indicates the partial derivative of the function with respect to the corresponding variable, and the subscript is used. i , j Cartesian coordinate system x , y coordinate, u For the incoming flow velocity, p For flow field pressure, ρ m For fluid density, μ m μ is the dynamic viscosity coefficient of the fluid. t The turbulent viscosity coefficient; Turbulent viscosity coefficient μ m The definition is as follows: (3) In the formula, T The fluid temperature.

[0036] Turbulent viscosity coefficient μ t The definition is as follows: (4) In the formula, α 1 represents the model constant term. k For turbulent kinetic energy, ωFor turbulence frequency, S This is the constant term of the shear stress tensor. F 2 is a mixed function.

[0037] Based on the fundamental governing equations of the flow field, the single-phase flow of compressible gas is calculated using the ideal gas law:

[0038] In the formula, R is the gas constant and T is the fluid temperature.

[0039] In S32, the turbulence model adopted is the k-ω SST turbulence model proposed by Menter in 1992 (Menter FR. Improved Two-Equation k-ω Turbulence Models for Aerodynamic Flows[J].NASA Technical Memorandum, 1992, 103975.), which can capture the turbulence structure of multi-scale unsteady flow fields and near-wall flow phenomena well.

[0040] S33 specifically refers to: The structural field governing equations are established using the principle of virtual displacement to derive the element characteristic equations as follows:

[0041] In the formula, [ M s ] is the structural mass matrix, [ C s ] is the structural damping matrix, [ K s [ ] represents the structural stiffness matrix. For structural displacement, For structural speed, For structural acceleration, { F HE} represents the flow field force acting on the structure under fluid-structure interaction, { F EX} represents the external excitation force experienced by the structure under fluid-structure interaction.

[0042] The coupling in S34 is:

[0043] In the formula, ρ is the material density, and c p Q is the specific heat capacity, k is the thermal conductivity, and Q is the specific heat capacity. ext As an external heat source, Q mec Heat is the result of mechanical work.

[0044] In S4, CFD is used, with the inlet pressure and outlet interface of the shell flow domain given, and the inlet interface and outlet velocity of the pipe flow domain given. All other surfaces have a roughness of 1 mm. At the same time, the change of flow field characteristic parameters with time is not considered. The fluid temperature is given, and the steady flow field is solved by CFD numerical calculation to obtain the steady numerical calculation results of the flow domain.

[0045] In S5, in the finite element structural solver, the top of the butterfly valve shell structure model obtained in S1 is set as a fixed end, and the inside is avoided as a fluid-structure interaction interface, so as to transfer thermodynamic, dynamic and displacement data with the solver that calculates compressible fluid dynamics.

[0046] S6 specifically includes the following steps: S61 uses the flow field change characteristics as a load on the thermodynamic coupling interface, which is then transferred to the finite element structural solver to discretize the structural heat conduction equation, calculate the temperature change of the butterfly valve shell, and obtain the shell temperature response data. S62 uses the flow field variation characteristics and shell temperature response data as loads on the fluid-structure interaction interface, and transfers them to the finite element structural solver to discretely solve the structural control equations, calculate the structural changes of the butterfly valve shell, and obtain the shell structural response data.

[0047] In S7, data on the structural deformation and flow field characteristics of the butterfly valve are obtained. The calculation results of S6 are post-processed to obtain data on the structural deformation and flow field characteristics of the butterfly valve. The post-processing method is as follows: extract the flow parameters (including pressure and temperature) within the flow domain, where the pressure distribution is represented by isolinear plots or contour plots, and the temperature is represented by isolinear plots or contour plots; by extracting the temperature changes and structural changes at various locations on the butterfly valve shell, the deformation characteristics of the shell are reflected.

[0048] Example 2: The steady flow conditions selected in this embodiment are: inlet pressure 201.1 kPa (absolute pressure), outlet mass flow rate 800 kg / h, and flow field temperature 299.75 K.

[0049] The specific process of a compressible fluid-structure interaction parameterized numerical prediction method based on a typical butterfly valve structure is as follows: Figure 1 As shown, it is mainly achieved through the following steps: Step 1: Establishing the butterfly valve shell structure model and mesh generation; To address the geometry of the butterfly valve housing, first, a solid model with a nominal diameter of 57mm was created in UG, comprising the inlet, outlet, inner wall, and other irregular outer surfaces. The file was then exported as a *.step file. The model was imported into the Geometry submodule of the Mechanical modal module in the Workbench platform. In the Engineering data submodule, the material properties of the butterfly valve housing were set as follows: density ρ = 2.68 g / cm³. 3 Then, in Modal, set the solid mesh size to 1.0mm and name the butterfly valve body outlet, inlet, and inner wall surface as follows: Figure 2 As shown, unstructured mesh generation is finally performed to obtain the structured mesh of the butterfly valve shell.

[0050] Step 2: Establishment of the shell and pipe flow domain model and mesh generation; Establish a shell and pipe flow domain with a fixed diameter of 57mm. In UG, create a shell flow domain with a diameter of 57mm and a length of 71mm, excluding the valve actuation part when fully open, and save the file as a *.step file. At the outlet location of the shell flow domain in UG, create a connecting pipe flow domain with a diameter of 57mm and an extended length of 710mm towards the outlet, and save the file as a *.step file. Mesh the established shell and pipe flow domains. First, create two Mechanical modal modules in the Workbench platform. In the Geometry submodule, import the shell and pipe flow domain models respectively. In the Modal submodule, set the fluid mesh size to 1mm. Name the inlet, valve, wall, and outlet in the shell flow domain, and the inlet, wall, and outlet in the pipe flow domain, as follows: Figure 3 As shown, an unstructured mesh is used to divide the watershed into shell and pipe meshes.

[0051] Step 3: Establish a compressible fluid dynamics calculation model; In order to solve the thermodynamic and structural deformation problems of the butterfly valve shell established in Step 1, and to perform flow field calculations on the shell and pipe mesh in Step 2, a compressible fluid dynamics calculation model needs to be established first. The compressible fluid dynamics calculation model includes the basic governing equations of the flow field, the turbulence model, and the governing equations of the structural field; The fundamental governing equations of the flow field include the continuity equation and the momentum equation: (1) (2) In the formula, This indicates the partial derivative of the function with respect to the corresponding variable, and the subscript is used. i , j Cartesian coordinate system x ,y coordinate, u For the incoming flow velocity, p For flow field pressure, ρ m For fluid density, μ m Let be the dynamic viscosity coefficient of the fluid. μ t is the turbulent viscosity coefficient.

[0052] Turbulent viscosity coefficient μ m The definition is as follows: (3) In the formula, T The fluid temperature.

[0053] Turbulent viscosity coefficient μ t The definition is as follows: (4) In the formula, α 1 represents the model constant term. k For turbulent kinetic energy, ω For turbulence frequency, S This is the constant term of the shear stress tensor. F 2 is a mixed function.

[0054] Based on the fundamental governing equations of the flow field, the single-phase flow of compressible gas is calculated using the ideal gas law: (5) In the formula, R Let be the gas constant, and take . R =461.6J / (kg·K).

[0055] The turbulence model adopted is the k-ω SST turbulence model proposed by Menter in 1992 (Menter F R. Improved Two-Equation k-ω Turbulence Models for Aerodynamic Flows[J]. NASA Technical Memorandum, 1992, 103975.), which can capture the turbulence structure of multi-scale unsteady flow fields and the flow phenomena in the near-wall region well.

[0056] (6) (7) In the formula, D k For turbulent dissipation terms, P k, P ω For turbulence generation term, σ k The Prandtl number is the turbulent kinetic energy. σ ω , σ ω2 The Prandtl number is the frequency of turbulence. F 1 is a mixed function. C ω , β ω , β 1 represents the model constant term.

[0057] The structural field governing equations are established using the principle of virtual displacement to derive the element characteristic equations as follows: (8) In the formula, [ M s ] is the structural mass matrix, [ C s ] is the structural damping matrix, [ K s [ ] represents the structural stiffness matrix. For structural displacement, For structural speed, For structural acceleration, { F HE} represents the flow field force acting on the structure under fluid-structure interaction, { F EX} represents the external excitation force experienced by the structure under fluid-structure interaction.

[0058] Based on the structural field governing equations, thermodynamic sequential coupling is performed using the heat conduction equations: (9) In the formula, ρ Material density, c p Specific heat capacity k Thermal conductivity, Q ext External heat source, Q mec Mechanical work is converted into heat.

[0059] Step 4: Calculation of steady compressible flow field; The shell and pipe flow domain meshes generated by the Mechanical modal module in step two are imported into the Computational Fluid Dynamics (CFD) solver. The calculation parameters are initialized as follows: the overall flow domain reference pressure is 0 atm, the overall flow domain temperature is 299.75 K, the overall flow domain heat transfer is set to Total Energy, the overall flow domain is set to ideal gas, and the dynamic viscosity of the ideal gas material is calculated using formula (3) from step three. The shell flow domain inlet is given as 201.1 kPa (absolute pressure), the shell flow domain outlet and the pipe flow domain inlet are set as interface, the pipe flow domain outlet is given as mass flow rate of 800 kg / h, and the remaining surfaces of the shell and pipe flow domains are set as walls with a roughness of 0.1 mm. Based on the above boundary conditions and initial conditions, high resolution is used for solution control, and the steady compressible flow field is calculated using the Computational Fluid Dynamics (CFD) solver to obtain the steady flow field calculation results of the shell and pipe flow domains (including velocity, pressure, and temperature distribution within the flow domains). The results are saved as *.res files.

[0060] Step 5: Setting boundary conditions for the butterfly valve body; Import the shell mesh generated by the Mechanical modal module in step one and the steady compressible flow field calculation results from step four into the setup submodule of the Steady-State Thermal module, respectively. In the setup submodule of the Steady-State Thermal module, set the Initial Temperature Value to 22℃, insert ImportedTemperature, select the inner wall surface of the shell as the thermodynamic coupling interface, and perform flow field temperature transfer.

[0061] Step Six: Steady Fluid-Structure Interaction Calculation; Step 6.1: Based on the shell boundary conditions set in Step 5, use the Steady-State Thermal module to perform thermodynamic coupling solution to obtain the thermodynamic data of the shell; Step 6.2: Import the data obtained in Step 6.1, the shell mesh generated by the Mechanical modal module in Step 1, and the steady compressible flow field calculation results from Step 4 into the setup submodule of the Static Structure module. Set the inlet and outlet to axial displacement of 0 (other directions to free), set the top of the shell to a fixed end face, insert Imported Pressure and select the inner wall surface of the shell as the mechanical coupling interface, insert Imported Body Temperature and select the shell model as thermodynamic coupling transfer. Use Static Structure to solve the static structural field and obtain the corresponding data for the shell structure.

[0062] Step 7: Obtain data on the structural deformation and flow field characteristics of the butterfly valve; The calculation results are post-processed using the Results submodules of the CFX module, the Steady-State Thermal module, and the Static Structure module to obtain the butterfly valve's flow resistance characteristics and shell temperature transfer, such as... Figure 4 As shown. By changing the steady flow field conditions and repeating steps one through seven, the flow resistance characteristics and shell temperature transfer of the butterfly valve under different design parameters are obtained. This method has smaller errors than theoretical calculations, improving the accuracy of butterfly valve flow characteristic prediction; it can adapt to more design conditions and provide a reference for butterfly valve shell design.

[0063] Example 3: The steady flow conditions selected in this embodiment are: inlet pressure 113.3 kPa (absolute pressure), outlet mass flow rate 800 kg / h, and flow field temperature 523.15 K. The main implementation steps are the same as in Embodiment 1. Figure 5 The flow resistance data and shell temperature data under the operating conditions are provided.

[0064] Example 4: The steady flow conditions selected in this embodiment are: inlet pressure 126.1 kPa (absolute pressure), outlet mass flow rate 800 kg / h, and flow field temperature 523.15 K. The main implementation steps are the same as in Embodiment 1. Figure 5 The flow resistance data and shell temperature data under the operating conditions are provided.

[0065] This embodiment applies a compressible fluid-structure interaction parametric numerical prediction method based on a typical butterfly valve structure to predict the flow field characteristics of the typical butterfly valve structure. It also provides a reference for designing the valve's flow capacity, thereby solving butterfly valve structure design problems and applying it to engineering practice. This demonstrates that a compressible fluid-structure interaction parametric numerical prediction method based on a typical butterfly valve structure has practical application value.

[0066] The above description is merely illustrative of the technical solutions of this invention. Those skilled in the art can modify or make equivalent substitutions to the technical solutions of this invention. All modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for predicting compressible fluid-structure interaction parameters based on a butterfly valve structure, characterized in that, Includes the following steps: S1. Establish the butterfly valve shell structure model and complete the mesh generation; S2, Establish the shell and pipe flow domain model and complete the mesh generation; S3, Establish a computational model for compressible fluid dynamics; S4, calculate the steady compressible flow field; S5, Set the boundary conditions for the butterfly valve body; S6, calculate steady fluid-structure interaction; S7, obtain data on the structural deformation and flow field characteristics of the butterfly valve.

2. The method for predicting compressible fluid-structure interaction parameters based on a butterfly valve structure according to claim 1, characterized in that, S1 specifically involves: for a given butterfly valve shell, using 3D modeling software to create models of the shell's inlet, outlet, inner wall surface, and other irregular outer surface entities; determining and creating the shell model's outlet, inlet, inner wall surface, and fixed surface; setting the mesh size; and using unstructured meshing for partitioning.

3. The method for predicting compressible fluid-structure interaction parameters based on a butterfly valve structure according to claim 1, characterized in that, S2 specifically refers to: the shell and pipeline flow domain, which includes the internal flow domain of the butterfly valve shell and the pipeline flow domain connecting the butterfly valve shell outlet. The internal flow domain of the butterfly valve shell is established using 3D modeling software, with a diameter consistent with the inner diameter of the butterfly valve shell and a length consistent with the length of the butterfly valve shell, excluding the valve disc actuation part when fully open; the pipeline flow domain connecting the shell flow domain outlet has a diameter consistent with the diameter of the butterfly valve shell, and a length 10 times the length of the butterfly valve shell; the mesh size is set, and an unstructured mesh is used for division.

4. The method for predicting compressible fluid-structure interaction parameters based on a butterfly valve structure according to claim 1, characterized in that, S3 specifically includes the following steps: S31, Establish the basic governing equations for the flow field of compressible fluids; S32, Establish a turbulence model for compressible fluids; S33, Establish the structural field control equations for compressible fluids; S34 uses the heat conduction equation to thermodynamically couple the models and equations of S31 to S33.

5. The method for predicting compressible fluid-structure interaction parameters based on a butterfly valve structure according to claim 4, characterized in that, S31 specifically refers to: The fundamental governing equations of the flow field include the continuity equation and the momentum equation. In the formula, This indicates the partial derivative of the function with respect to the corresponding variable, and the subscript is used. i , j Cartesian coordinate system x , y coordinate, u For the incoming flow velocity, p For flow field pressure, ρ m For fluid density, μ m μ is the dynamic viscosity coefficient of the fluid. t The turbulent viscosity coefficient; Based on the fundamental governing equations of the flow field, the single-phase flow of compressible gas is calculated using the ideal gas law: In the formula, R is the gas constant and T is the fluid temperature.

6. The method for predicting compressible fluid-structure interaction parameters based on a butterfly valve structure according to claim 4, characterized in that, S33 specifically refers to: The structural field governing equations are established using the principle of virtual displacement to derive the element characteristic equations as follows: In the formula, [ M s ] is the structural mass matrix, [ C s ] is the structural damping matrix, [ K s [ ] represents the structural stiffness matrix. For structural displacement, For structural speed, For structural acceleration, { F HE } represents the flow field force acting on the structure under fluid-structure interaction, { F EX } represents the external excitation force experienced by the structure under fluid-structure interaction.

7. The method for predicting compressible fluid-structure interaction parameters based on a butterfly valve structure according to claim 4, characterized in that, The coupling in S34 is: In the formula, ρ is the material density, and c p Q is the specific heat capacity, k is the thermal conductivity, and Q is the specific heat capacity. ext As an external heat source, Q mec Heat is the result of mechanical work.

8. The method for predicting compressible fluid-structure interaction parameters based on a butterfly valve structure according to claim 1, characterized in that, In S4, CFD is used, with the inlet pressure and outlet interface of the shell flow domain given, and the inlet interface and outlet velocity of the pipe flow domain given. All other surfaces have a roughness of 1 mm. At the same time, the change of flow field characteristic parameters with time is not considered. The fluid temperature is given, and the steady flow field is solved by CFD numerical calculation to obtain the steady numerical calculation results of the flow domain.

9. The method for predicting compressible fluid-structure interaction parameters based on a butterfly valve structure according to claim 1, characterized in that, In S5, in the finite element structural solver, the top of the butterfly valve shell structure model obtained in S1 is set as a fixed end, and the inside is avoided as a fluid-structure interaction interface, so as to transfer thermodynamic, dynamic and displacement data with the solver that calculates compressible fluid dynamics.

10. The method for predicting compressible fluid-structure interaction parameters based on a butterfly valve structure according to claim 1, characterized in that, S6 specifically includes the following steps: S61 uses the flow field change characteristics as a load on the thermodynamic coupling interface, which is then transferred to the finite element structural solver to discretize the structural heat conduction equation, calculate the temperature change of the butterfly valve shell, and obtain the shell temperature response data. S62 uses the flow field variation characteristics and shell temperature response data as loads on the fluid-structure interaction interface, and transfers them to the finite element structural solver to discretely solve the structural control equations, calculate the structural changes of the butterfly valve shell, and obtain the shell structural response data.

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