A numerical simulation method of double-screen standard temperature sensor based on CFD

Abstract

The present invention provides a numerical simulation method of a dual-screen standard temperature sensor based on CFD, comprising the following steps: modeling and naming of the calculation domain of the dual-screen standard temperature sensor; meshing of the calculation domain model of the dual-screen standard temperature sensor; initial field simulation and solution of the CFD flow field of the dual-screen standard temperature sensor; outputting the total temperature of the incoming flow of the dual-screen standard temperature sensor and the ball weld solid wall temperature; outputting the ball weld solid wall temperature of the dual-screen standard temperature sensor; outputting the ball weld solid wall temperature of the dual-screen standard temperature sensor, and calculating the velocity error, thermal conductivity error, radiation error, and temperature measurement deviation of the dual-screen standard temperature sensor. The present invention can effectively solve the problems of low theoretical analysis and calculation accuracy of the dual-screen standard temperature sensor, little temperature field information obtained by experimental testing of the dual-screen standard temperature sensor, and high experimental cost, and provides a more efficient and accurate design method for the dual-screen standard temperature sensor.

Description

Technical Field

[0001] The invention belongs to the technical field of numerical simulation methods of sensors, and in particular relates to a numerical simulation method of a double-screen standard temperature sensor based on CFD. Background Art

[0002] With the rapid development of science and technology, sensor technology is being used more and more widely in various fields. Among them, standard temperature sensors, as an important measuring device, are widely used in aerospace, energy, environmental monitoring, industrial production and other fields to accurately measure the temperature of high-temperature gases.

[0003] The design of traditional standard temperature sensors mainly relies on theoretical calculations and experimental tests. This design and manufacturing method is time-consuming and costly, and cannot simulate certain special working conditions in experimental tests. Its experimental methods or tests may have certain difficulties.

[0004] Therefore, developing a new standard temperature sensor that can measure the temperature in complex flow fields more accurately, stably and efficiently, and designing it through numerical simulation calculation methods has become an urgent problem to be solved in the field of sensor technology.

[0005] Numerical simulation technology based on computational fluid dynamics (CFD) has shown great potential in sensor design and optimization in recent years because it can simulate the flow and heat transfer process of fluids on computers and predict the distribution of parameters such as temperature and velocity. However, there are relatively few studies on CFD numerical simulation methods for dual-screen standard temperature sensors, and there is a large technical gap.

[0006] Based on this, a numerical simulation method of a double-screen standard temperature sensor based on CFD is proposed. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a numerical simulation method of a double-screen standard temperature sensor based on CFD in view of the deficiencies of the above-mentioned prior art, so as to solve the problems raised in the above-mentioned background technology.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a numerical simulation method of a double-screen standard temperature sensor based on CFD, comprising the following steps:

[0009] S1. Modeling and naming of the computational domain of dual-screen standard temperature sensor;

[0010] S2, mesh division of the computational domain model of the dual-screen standard temperature sensor;

[0011] S3, setting the flow field boundary conditions, and solving the initial CFD flow field simulation of the double-screen standard temperature sensor;

[0012] S4, read the solid domain grid of the dual-screen standard temperature sensor, perform CFD fluid-solid coupling simulation solution of the dual-screen standard temperature sensor, and output the total temperature of the dual-screen standard temperature sensor flow and the ball weld solid wall or solid domain temperature;

[0013] S5. Set the thermal boundary conditions, perform CFD fluid-solid coupling simulation of the dual-screen standard temperature sensor, and output the ball weld solid wall or solid domain temperature of the dual-screen standard temperature sensor;

[0014] S6. Add a radiation model, set radiation boundary conditions, perform CFD simulation with radiation fluid-solid coupling for the dual-screen standard temperature sensor, and output the ball weld solid wall or solid domain temperature of the dual-screen standard temperature sensor;

[0015] S7. Process the speed error, thermal conductivity error, radiation error, and temperature measurement deviation of the dual-screen standard temperature sensor according to the simulation results in S4-S6.

[0016] As a further explanation of the present invention, the modeling and naming method in S1 is to use the length of the double-screen standard temperature sensor as its characteristic length, the shape of the calculation domain is a sphere, the diameter of the sphere calculation domain is more than 5 times the characteristic length of the double-screen standard temperature sensor, and the fluid calculation domain of the double-screen standard temperature sensor is obtained by Boolean difference between the calculation domain and the solid calculation domain;

[0017] At the same time, name the fluid, solid computational domain and related surfaces.

[0018] As a further explanation of the present invention, the meshing method in S2 is to perform surface meshing on the fluid calculation domain and the solid calculation domain, the surface mesh minimum value is less than or equal to 0.1 times the diameter of the even wire, and the surface mesh maximum value is less than or equal to 0.4 times the diameter of the even wire;

[0019] The fluid calculation domain and the solid calculation domain are divided into volume meshes. The global size of the mesh division is: the minimum mesh value is less than or equal to 0.1 times the diameter of the wire, the maximum mesh value is less than or equal to 20 times the diameter of the wire, the minimum mesh value of the wire and ball weld surface is less than or equal to 0.1 times the diameter of the wire, and the maximum mesh value of the wire and ball weld surface is less than or equal to 0.2 times the diameter of the wire.

[0020] As a further explanation of the present invention, the simulation method in S3-S6 is to first set the fluid boundary conditions for the dual-screen standard temperature sensor, and perform CFD flow field simulation to obtain an initialized flow field;

[0021] Then import the solid domain mesh of the dual-screen standard temperature sensor, match the mesh interface, and perform CFD fluid-solid coupling simulation to obtain the total temperature of the incoming flow and the solid wall or solid domain temperature of the sensor ball weld;

[0022] Then set the thermal boundary conditions of the double-screen standard temperature sensor, perform CFD fluid-solid coupling simulation, and obtain the temperature of the sensor ball weld solid wall or solid domain;

[0023] Then set up the radiation model, set the radiation boundary conditions, and perform CFD simulation with radiation fluid-solid coupling to obtain the temperature of the sensor ball weld solid wall or solid domain.

[0024] As a further illustration of the present invention, the velocity error in S7 is the difference between the total temperature of the incoming flow in S4 and the temperature of the ball weld solid wall or solid domain;

[0025] The thermal conductivity error is the difference between the temperature of the ball-welded solid wall or solid domain in S5 and the temperature of the ball-welded solid wall or solid domain in S4;

[0026] The radiation error is the difference between the temperature of the ball-welded solid wall or solid domain in S6 and the temperature of the ball-welded solid wall or solid domain in S5;

[0027] The temperature measurement deviation is the difference between the total temperature of the incoming flow in S4 and the temperature of the ball weld solid wall or solid domain in S6.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] 1. The present invention can improve the accuracy of theoretical analysis and calculation and reduce the dependence on experimental testing.

[0030] 2. The present invention can obtain richer temperature field information, which helps to deeply understand the working mechanism and optimal design of standard temperature sensors.

[0031] 3. The present invention can reduce the test cost, shorten the development cycle, and speed up product development.

[0032] 4. The present invention can improve the design accuracy of the dual-screen standard temperature sensor and ensure its stability and accuracy under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a CFD simulation flow chart of a dual-screen standard temperature sensor according to an embodiment of the present invention.

[0034] Figure 2 It is a cross-sectional view of the solid domain model of the dual-screen standard temperature sensor according to an embodiment of the present invention.

[0035] Figure 3 This is a cross-sectional view of the fluid domain model of the dual-screen standard temperature sensor according to an embodiment of the present invention.

[0036] Figure 4 Parameter diagram of the fluid domain and solid domain mesh size function according to an embodiment of the present invention.

[0037] Figure 5Graph showing the mesh size function parameters of the fluid domain boundary layer according to an embodiment of the present invention.

[0038] Figure 6 Schematic diagram of the solid computational domain mesh according to an embodiment of the present invention.

[0039] Figure 7 Schematic diagram of the mesh cross section of the fluid calculation domain according to an embodiment of the present invention.

[0040] Figure 8 This is a ball soldering temperature cloud diagram of a dual-screen standard temperature sensor that only considers speed error according to an embodiment of the present invention.

[0041] Fig. 9 This is a ball soldering temperature cloud diagram of a dual-screen standard temperature sensor taking into account speed error and thermal conductivity error according to an embodiment of the present invention.

[0042] Fig.10 This is a ball soldering temperature cloud diagram of a dual-screen standard temperature sensor taking into account speed error, thermal conduction error, and radiation error according to an embodiment of the present invention.

[0043] Fig.11 This is a comparison chart of temperature measurement deviation values ​​obtained by theoretical calculation, simulation calculation, and experimental test of a dual-screen standard temperature sensor under the same working conditions in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0045] like Figure 1 As shown, the present invention provides a technical solution: a numerical simulation method of a double-screen standard temperature sensor based on CFD, comprising the following steps:

[0046] S1. Modeling and naming of calculation domain of dual-screen standard temperature sensor

[0047] According to the two-dimensional drawing of the dual-screen standard temperature sensor, the CAD geometric modeling software is used to perform three-dimensional geometric parametric modeling to generate a dual-screen standard temperature sensor entity model;

[0048] Determine the computational domain of the numerical simulation of the dual-screen standard temperature sensor, take the length of the dual-screen standard temperature sensor as its characteristic length, take a sphere as the computational domain shape, and take the diameter of the sphere computational domain as more than 5 times the characteristic length of the dual-screen standard temperature sensor. Obtain the fluid computational domain of the dual-screen standard temperature sensor by Boolean difference between the computational domain and the solid computational domain.

[0049] Define the names of the geometric attributes of the fluid and solid computational domain models;

[0050] Name the geometric attribute surface of the fluid calculation domain model according to the boundary condition type and the fluid-solid coupling relationship; name the geometric attribute surface of the solid calculation domain model according to the boundary condition type and the fluid-solid coupling relationship;

[0051] S2. Grid division of the computational domain model of the dual-screen standard temperature sensor

[0052] Divide the fluid calculation domain and solid calculation domain into surface meshes, with the minimum value of the surface mesh being less than or equal to 0.1 times the diameter of the even wire, and the maximum value of the surface mesh being less than or equal to 0.4 times the diameter of the even wire;

[0053] Perform volume meshing on the fluid and solid computational domains. The global size of the meshing is as follows: the minimum mesh value is less than or equal to 0.1 times the diameter of the wire, the maximum mesh value is less than or equal to 20 times the diameter of the wire, the minimum mesh value of the wire and ball weld surface is less than or equal to 0.1 times the diameter of the wire, and the maximum mesh value of the wire and ball weld surface is less than or equal to 0.2 times the diameter of the wire;

[0054] The boundary layer grid is set for the wall surface in the fluid calculation domain. The boundary layer grid type adopts aspect-ratio. The number of boundary layer layers of the even wire and ball weld grid is set to 8, and the aspect ratio of the first grid layer is 8; the number of boundary layer layers of the other fluid wall grids is set to 5, and the aspect ratio of the first grid layer is 10;

[0055] The fluid calculation domain body grid and the solid calculation domain body grid are checked by the grid orthogonality coefficient, and the value range of the grid orthogonality coefficient is [0,1]. When the grid orthogonality coefficient is less than or equal to 0.8, the grid quality is good;

[0056] S3, Dual-screen standard temperature sensor CFD flow field initial simulation solution

[0057] The k-omega SST model is used as the turbulence model for CFD fluid simulation solution of dual-screen standard temperature sensor;

[0058] The boundary condition setting of the dual-screen standard temperature sensor is that the flow field inlet (inlet) is the pressure far field boundary condition;

[0059] The solution method is set to steady-state solution, and the pressure-velocity coupling is set to Coupled;

[0060] In the spatial discretization format, the gradient is discretized using the Least Squares Cell Based format; the pressure, density, momentum, turbulent kinetic energy, and turbulent dissipation rate are all discretized using the second-order discretization format;

[0061] In the convergence criterion condition, the mass continuity term is set to 10 -3 , the momentum x-velocity term is set to 10 -3 , the momentum y-velocity term is set to 10 -3 , the momentum z-velocity term is set to 10 -3 , the turbulence k term is set to 10 -3 , the turbulence omega term is set to 10 -3 , the energy x-velocity term is set to 10 -6 ;

[0062] If all residual terms in the calculation process meet the convergence criteria, the calculation converges; if the calculation does not converge when the number of calculation iterations reaches the maximum value, the number of iterations is modified until the calculation converges;

[0063] S4, dual-screen standard temperature sensor CFD fluid-solid coupling simulation to solve velocity error

[0064] Based on the S3 simulation results, the solid domain mesh of the dual-screen standard temperature sensor is imported, and the fluid-solid coupling interface is matched and set;

[0065] Set the ball-welded solid wall of the double-screen standard temperature sensor as the monitoring surface to monitor its wall temperature value;

[0066] During the calculation process, if all residual items meet the convergence criteria and the temperature variation range of the solid wall of the ball weld of the double-screen standard temperature sensor is less than or equal to 0.01 K, the calculation is considered to be converged; if the calculation has not converged when the number of calculation iterations reaches the maximum value, the number of iterations is modified until the calculation reaches convergence;

[0067] Output flow field inlet total temperature, double screen standard temperature sensor ball weld solid wall or solid domain temperature;

[0068] S5, dual-screen standard temperature sensor CFD fluid-structure coupling simulation solution

[0069] Based on the S4 simulation calculation results, the fixed wall surface of the cooling water end of the double-screen standard temperature sensor is set to a constant temperature;

[0070] During the calculation process, if all residual items meet the convergence criteria and the temperature variation range of the solid wall of the ball weld of the double-screen standard temperature sensor is less than or equal to 0.01 K, the calculation is considered to be converged; if the calculation has not converged when the number of calculation iterations reaches the maximum value, the number of iterations is modified until the calculation reaches convergence;

[0071] Output double screen standard temperature sensor ball weld solid wall or solid domain temperature;

[0072] S6, dual-screen standard temperature sensor CFD fluid-structure coupling simulation solution

[0073] Based on the S5 simulation results, the CFD simulation radiation model is set as: Do (Discrete Ordinates) model;

[0074] Set up the solid calculation domain wall radiation coefficient with dual-screen standard temperature sensors;

[0075] During the calculation process, if all residual items meet the convergence criteria and the temperature variation range of the solid wall of the ball weld of the double-screen standard temperature sensor is less than or equal to 0.01 K, the calculation is considered to be converged; if the calculation has not converged when the number of calculation iterations reaches the maximum value, the number of iterations is modified until the calculation reaches convergence;

[0076] Output double screen standard temperature sensor ball weld solid wall or solid domain temperature;

[0077] S7, dual-screen standard temperature sensor CFD simulation data processing

[0078] According to the relevant parameters output in steps S4-S6, the speed error, thermal conductivity error, radiation error and temperature measurement deviation of the dual-screen standard temperature sensor are solved.

[0079] When used specifically;

[0080] S1. Modeling and naming of calculation domain of dual-screen standard temperature sensor

[0081] According to the two-dimensional drawings of the dual-screen standard temperature sensor, CAD geometric modeling software is used to perform three-dimensional geometric parametric modeling to generate a dual-screen standard temperature sensor solid model, and the geometric structure in the model that has little impact on the numerical simulation calculation is cleaned up to generate the solid calculation domain of the dual-screen standard temperature sensor. Its cross-section is shown in the figure below. Figure 2 As shown;

[0082] Determine the computational domain of the numerical simulation of the dual-screen standard temperature sensor, take the length of the dual-screen standard temperature sensor as its characteristic length, take a sphere as the computational domain shape, and take the diameter of the sphere computational domain as 10 times the characteristic length of the dual-screen standard temperature sensor. By taking the Boolean difference between the computational domain and the solid computational domain, the fluid computational domain of the dual-screen standard temperature sensor is obtained, and its cross-section is shown in the figure below. Figure 3 As shown;

[0083] Define the names of the geometric attributes of the fluid calculation domain and solid calculation domain models as fluid_sensor and solid_sensor respectively;

[0084] The geometric attribute surfaces of the fluid calculation domain model are named according to the boundary condition type and the fluid-solid coupling relationship. The surface names in the fluid calculation domain are named as follows:

[0085] wall_interface_fluid, wall_os_interface_fluid, wall_qh_interface_fluid, wall_interface_fixed_fluid, inlet;

[0086] The geometric attribute surface names of the solid computational domain model are named according to the boundary condition type and the fluid-solid coupling relationship. The surface names in the solid computational domain are named as follows:

[0087] wall_interface_solid, wall_os_interface_solid, wall_qh_interface_solid, wall_interface_fixed_solid;

[0088] S2. Grid division of the computational domain model of the dual-screen standard temperature sensor

[0089] Perform surface meshing on the fluid calculation domain (fluid_sensor) and the solid calculation domain (solid_sensor), where the minimum value of the surface mesh is 0.2mm, the maximum value of the surface mesh is 10mm, and the mesh growth rate is 1.2;

[0090] The fluid calculation domain (fluid_sensor) and the solid calculation domain (solid_sensor) are meshed. The meshing type is tetrahedral mesh, and the global size of the meshing is: the minimum mesh value is 0.2mm, the maximum mesh value is 10mm, the mesh growth rate is 1.2, and the curvature normal angle is 10°. At the same time, when meshing, the size function is set for the mesh surface of the calculation domain. The size function parameters of the fluid domain and solid domain mesh surface are as follows: Figure 4 As shown;

[0091] The boundary layer grid is set for the wall surface in the fluid calculation domain (fluid_sensor). The boundary layer grid type uses aspect-ratio. The specific boundary layer grid parameter settings are as follows: Figure 5 As shown;

[0092] The fluid calculation domain body grid and the solid calculation domain body grid are checked by the grid orthogonality coefficient, and the value range of the grid orthogonality coefficient is [0,1]. When the grid orthogonality coefficient is less than or equal to 0.8, the grid quality is good;

[0093] The solid computing domain body grid is shown in FIG6 , and the solid computing domain body grid is shown in FIG7 ; wherein the orthogonality coefficient of the fluid computing domain body grid is 0.6754, and the orthogonality coefficient of the solid computing domain body grid is 0.6943;

[0094] S3, Dual-screen standard temperature sensor CFD flow field initial simulation solution

[0095] The k-omega SST model is used as the turbulence model for CFD fluid simulation solution of dual-screen standard temperature sensor;

[0096] The boundary conditions of the dual-screen standard temperature sensor are set. The flow field inlet (inlet) is the pressure far-field boundary condition, and the incoming flow Mach number is set to 0.3, the incoming flow static temperature is set to 2300K, and the incoming flow static pressure is set to 101325Pa; the flow field inlet turbulence intensity is set to 1%, and the turbulent viscosity ratio is set to 1;

[0097] The solution method is set to steady-state solution, and the pressure-velocity coupling is set to Coupled;

[0098] In the spatial discretization format, the gradient is discretized using the Least Squares Cell Based format; the pressure, density, momentum, turbulent kinetic energy, and turbulent dissipation rate are all discretized using the second-order discretization format;

[0099] In the convergence criterion conditions, the mass continuity term is set to 10-3 and the momentum x-velocity term is set to 10 -3 , the momentum y-velocity term is set to 10 -3 , the momentum z-velocity term is set to 10 -3 , the turbulence k term is set to 10 -3 , the turbulence omega term is set to 10 -3 , the energy x-velocity term is set to 10 -6 ;

[0100] The number of iterations is set to 2000. If all residual items meet the convergence criteria during the calculation process, the calculation converges. If the calculation does not converge when the number of iterations reaches the maximum value, the number of iterations is modified until the calculation converges.

[0101] S4, dual-screen standard temperature sensor CFD fluid-solid coupling simulation to solve velocity error

[0102] Based on the S3 simulation results, the solid domain mesh of the dual-screen standard temperature sensor is imported, and the fluid-solid coupling interface is matched and set;

[0103] Set the double-screen standard temperature sensor ball weld solid wall (wall_qh_interface_solid) as the monitoring surface to monitor its wall temperature value;

[0104] Set the number of iterations to 1000. During the calculation process, all residual items meet the convergence criteria. At the same time, the temperature variation range of the solid wall of the ball weld of the double-screen standard temperature sensor is less than or equal to 0.01 K. The calculation is considered to be converged. If the calculation has not converged when the number of iterations reaches the maximum value, modify the number of iterations until the calculation converges.

[0105] The simulation calculation obtains the temperature distribution cloud diagram of the ball bond and the wire of the dual-screen standard temperature sensor considering only the speed error, as shown in Figure 8 As shown;

[0106] Total temperature of output flow field inlet: , Double screen standard temperature sensor ball weld solid wall (wall_qh_interface_solid) temperature: , and record the value;

[0107] S5, dual-screen standard temperature sensor CFD fluid-structure coupling simulation solution

[0108] Based on the S4 simulation calculation results, the fixed wall (wall_interface_fixed_solid) of the cooling water end of the double-screen standard temperature sensor is set to a constant temperature;

[0109] Set the number of iterations to 1000. During the calculation process, all residual items meet the convergence criteria. At the same time, the temperature variation range of the solid wall of the ball weld of the double-screen standard temperature sensor is less than or equal to 0.01 K. The calculation is considered to be converged. If the calculation has not converged when the number of iterations reaches the maximum value, modify the number of iterations until the calculation converges.

[0110] The temperature distribution cloud diagram of the ball welding and the wire of the dual-screen standard temperature sensor considering the speed error and thermal conductivity error is obtained by simulation calculation, as shown in Fig. 9 As shown;

[0111] Output dual screen standard temperature sensor ball weld solid wall (wall_qh_interface_solid) temperature: , and record the value;

[0112] S6, dual-screen standard temperature sensor CFD fluid-structure coupling simulation solution

[0113] Based on the S5 simulation results, the CFD simulation radiation model is set as: Do (Discrete Ordinates) model;

[0114] Set the radiation coefficient of the solid calculation domain wall (wall_interface_solid, wall_os_interface_solid, wall_qh_interface_solid, wall_interface_fixed_ solid) of the dual-screen standard temperature sensor;

[0115] Set the number of iterations to 1000. During the calculation process, all residual items meet the convergence criteria. At the same time, the temperature variation range of the solid wall of the ball weld of the double-screen standard temperature sensor is less than or equal to 0.01 K. The calculation is considered to be converged. If the calculation has not converged when the number of iterations reaches the maximum value, modify the number of iterations until the calculation converges.

[0116] The temperature distribution cloud diagram of the ball weld and the wire of the dual-screen standard temperature sensor considering the speed error, thermal conductivity error, and radiation error is obtained by simulation calculation, as shown in Fig.10 As shown;

[0117] Output dual screen standard temperature sensor ball weld solid wall (wall_qh_interface_solid) temperature: , and record the value;

[0118] S7, dual-screen standard temperature sensor CFD simulation data processing

[0119] According to the relevant parameters output in steps S4-S6, the speed error, thermal conductivity error, radiation error and temperature measurement deviation of the dual-screen standard temperature sensor are solved.

[0120] The speed error calculation formula of the dual-screen standard temperature sensor is:

[0121]

[0122] Where: is the speed error;

[0123] is the total temperature of the inlet flow;

[0124] When heat conduction and radiation are not set, the static temperature of the solid wall of the ball welding of the double-screen standard temperature sensor;

[0125] The calculation formula for the thermal conductivity error of the dual-screen standard temperature sensor is:

[0126]

[0127] Where: is the speed error;

[0128] is the total temperature of the inlet flow;

[0129] When heat conduction and radiation are not set, the static temperature of the solid wall of the ball welding of the double-screen standard temperature sensor;

[0130] The calculation formula for the radiation error of the dual-screen standard temperature sensor is:

[0131]

[0132] Where: is the radiation error;

[0133] To set the heat conduction and radiation, the double screen standard temperature sensor ball welded solid wall static temperature;

[0134] The temperature measurement deviation calculation formula of the dual-screen standard temperature sensor is:

[0135]

[0136] Where: is the temperature measurement deviation.

[0137] Depend on Fig.11 It can be seen from the comparison that the numerical simulation method in this embodiment verifies the reliability of the method by comparing the test data of the double-screen standard temperature sensor under different calculation conditions and the theoretical calculation data;

[0138] The maximum error between the temperature measurement deviation solved by the simulation method of the present invention and the test result is less than 0.5K;

[0139] The simulation method of the present invention has smaller error than the theoretical calculation method of temperature measurement deviation of the double-screen standard temperature sensor;

[0140] The simulation method of the present invention can be used to predict the speed error, thermal conductivity error, radiation error and temperature measurement deviation of a standard temperature sensor, and can be applicable to various forms of standard temperature sensors.

[0141] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0142] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A numerical simulation method of a dual-screen standard temperature sensor based on CFD, characterized in that: The following steps are involved: S1. Modeling and naming of the computational domain of dual-screen standard temperature sensor; S2, mesh division of the computational domain model of the dual-screen standard temperature sensor; S3, setting the flow field boundary conditions, and solving the initial CFD flow field simulation of the double-screen standard temperature sensor; S4, read the solid domain grid of the dual-screen standard temperature sensor, perform CFD fluid-solid coupling simulation solution of the dual-screen standard temperature sensor, and output the total temperature of the dual-screen standard temperature sensor flow and the ball weld solid wall or solid domain temperature; S5. Set the thermal boundary conditions, perform CFD fluid-solid coupling simulation of the dual-screen standard temperature sensor, and output the ball weld solid wall or solid domain temperature of the dual-screen standard temperature sensor; S6. Add a radiation model, set radiation boundary conditions, perform CFD simulation with radiation fluid-solid coupling for the dual-screen standard temperature sensor, and output the ball weld solid wall or solid domain temperature of the dual-screen standard temperature sensor; S7. Process the speed error, thermal conductivity error, radiation error, and temperature measurement deviation of the dual-screen standard temperature sensor according to the simulation results in S4-S6.

2. The numerical simulation method of a dual-screen standard temperature sensor based on CFD according to claim 1 is characterized in that: The modeling and naming method in S1 is based on the length of the double-screen standard temperature sensor as its characteristic length. The shape of the calculation domain is a sphere, and the diameter of the sphere calculation domain is more than 5 times the characteristic length of the double-screen standard temperature sensor. The fluid calculation domain of the double-screen standard temperature sensor is obtained by Boolean difference between the calculation domain and the solid calculation domain. At the same time, name the fluid, solid computational domain and related surfaces.

3. The numerical simulation method of a dual-screen standard temperature sensor based on CFD according to claim 1 is characterized in that: The grid division method in S2 is to divide the fluid calculation domain and the solid calculation domain into surface grids, the minimum value of the surface grid is less than or equal to 0.1 times the diameter of the even wire, and the maximum value of the surface grid is less than or equal to 0.4 times the diameter of the even wire; The fluid calculation domain and the solid calculation domain are divided into volume meshes. The global size of the mesh division is: the minimum mesh value is less than or equal to 0.1 times the diameter of the wire, the maximum mesh value is less than or equal to 20 times the diameter of the wire, the minimum mesh value of the wire and ball weld surface is less than or equal to 0.1 times the diameter of the wire, and the maximum mesh value of the wire and ball weld surface is less than or equal to 0.2 times the diameter of the wire.

4. The numerical simulation method of a dual-screen standard temperature sensor based on CFD according to claim 1 is characterized in that: The simulation method in S3-S6 is to first set the fluid boundary conditions for the dual-screen standard temperature sensor and perform CFD flow field simulation to obtain the initialized flow field; Then import the solid domain mesh of the dual-screen standard temperature sensor, perform mesh interface matching, and perform CFD fluid-solid coupling simulation to obtain the total temperature of the incoming flow and the solid wall or solid domain temperature of the sensor ball weld; Then set the thermal boundary conditions of the double-screen standard temperature sensor, perform CFD fluid-solid coupling simulation, and obtain the temperature of the sensor ball weld solid wall or solid domain; Then set up the radiation model, set the radiation boundary conditions, and perform CFD simulation with radiation fluid-solid coupling to obtain the temperature of the sensor ball weld solid wall or solid domain.

5. The numerical simulation method of a dual-screen standard temperature sensor based on CFD according to claim 1 is characterized in that: The velocity error in S7 is the difference between the total temperature of the incoming flow in S4 and the temperature of the ball weld solid wall or solid domain; The thermal conductivity error is the difference between the temperature of the ball-welded solid wall or solid domain in S5 and the temperature of the ball-welded solid wall or solid domain in S4; The radiation error is the difference between the temperature of the ball-welded solid wall or solid domain in S6 and the temperature of the ball-welded solid wall or solid domain in S5; The temperature measurement deviation is the difference between the total temperature of the incoming flow in S4 and the temperature of the ball weld solid wall or solid domain in S6.

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