Cooler heat flow coupling simulation method for offshore wind power tower transformer

Abstract

The invention discloses a heat flow coupling simulation method for a cooler for an offshore wind power tower transformer. The method comprises the steps that an equivalent three-dimensional simulation model of the cooler for the offshore wind power tower transformer is obtained; loading a grid model corresponding to the equivalent three-dimensional simulation model in simulation software; according to the solver, the solving parameters and the grid model, performing heat flow coupling simulation calculation on the equivalent three-dimensional simulation model in simulation software to obtain a turbulent flow simulation result and a flow heat transfer simulation result of the cooler for the offshore wind power tower transformer; and determining the temperature distribution characteristic and the temperature distribution change rule of the cooler for the offshore wind power tower transformer in the heat dissipation process according to the turbulence flow simulation result and the flow heat transfer simulation result. According to the scheme, dynamic simulation is carried out on the temperature field and the fluid field in the cooler through a heat flow coupling calculation method in combination with multi-physics field modeling, and therefore the dynamic behavior and temperature distribution of internal fluid in the cooling process of the cooler for the offshore wind power tower transformer can be more accurately simulated.

Description

Technical Field

[0001] The present application relates to the technical field of non-electrical quantity protection for power system transformers, and in particular to a thermal-fluid coupling simulation method for a cooler for an offshore wind power tower transformer. Background Art

[0002] During the operation of offshore wind power tower transformers, their internal windings and electrical accessories generate a lot of heat under long-term high-load operation, so how to efficiently dissipate heat from offshore wind power tower transformers has become one of the key issues for the safe operation of transformers. If the heat dissipation system is not designed properly, the internal oil temperature will exceed the reasonable range, directly affecting the insulation performance of the transformer, shortening the service life of the equipment, and even causing serious safety accidents. Therefore, ensuring the stability and efficiency of the transformer heat dissipation system is crucial for the long-term safe operation of offshore wind power projects.

[0003] At present, microchannel brazed coolers have become a common heat dissipation device for offshore wind power tower transformer cooling systems due to their simple structure, high heat dissipation efficiency, and convenient installation and maintenance. However, existing cooler designs mainly rely on experience or simplified models, and lack a systematic theoretical model and accurate simulation analysis method for the complex temperature and fluid fields inside the cooler.

[0004] This makes it difficult to accurately evaluate the heat dissipation performance and internal temperature distribution of the cooler in actual applications during the design phase, and thus it is impossible to predict whether the cooler design can meet the actual heat dissipation requirements, which increases the risk of transformer failure due to overheating. Summary of the invention

[0005] To this end, this application discloses the following technical solutions:

[0006] The first aspect of the present application provides a thermal-fluid coupling simulation method for a cooler for an offshore wind power tower transformer, comprising:

[0007] Obtain an equivalent 3D simulation model of the cooler for offshore wind power tower transformer;

[0008] Loading a mesh model corresponding to the equivalent three-dimensional simulation model in the simulation software;

[0009] According to the solver, the preset solution parameters and the grid model, the equivalent three-dimensional simulation model is subjected to a thermal-fluid coupling simulation calculation in the simulation software to obtain a turbulent flow simulation result and a flow heat transfer simulation result of the cooler for the offshore wind power tower transformer;

[0010] The temperature distribution characteristics and temperature distribution variation rules of the cooler for the offshore wind power tower transformer during the heat dissipation process are determined according to the turbulent flow simulation results and the flow heat transfer simulation results.

[0011] Optionally, the equivalent three-dimensional simulation model is a three-dimensional simulation model constructed in proportion to the size of the cooler for the offshore wind power tower transformer.

[0012] Optionally, the cooler for the offshore wind power tower transformer is a microchannel brazed cooler.

[0013] Optionally, the solver is a steady-state pressure-based solver;

[0014] The solution parameters include boundary condition parameters, material property parameters and model parameters, and the model parameters are turbulence models.

[0015] Optionally, performing heat-flow coupling simulation calculation on the equivalent three-dimensional simulation model in the simulation software according to the solver, preset solution parameters and the grid model includes:

[0016] Performing numerical simulation of turbulent flow and flow heat transfer on the equivalent three-dimensional simulation model;

[0017] Calculating the heat conduction process of the equivalent three-dimensional simulation model during the heat dissipation process;

[0018] Calculating the heat convection process of the equivalent three-dimensional simulation model during the heat dissipation process;

[0019] Calculating the thermal radiation process of the equivalent three-dimensional simulation model during the heat dissipation process;

[0020] Based on the boundary condition parameters, the thermal-fluid coupling method is used to solve the fluid velocity and temperature distribution.

[0021] Optionally, the performing numerical simulation of turbulent flow and flow heat transfer on the equivalent three-dimensional simulation model includes:

[0022] Performing numerical simulation of turbulent flow and flow heat transfer on the equivalent three-dimensional simulation model according to the continuity equation, energy equation and momentum equation;

[0023] Wherein, the continuity equation includes fluid density, mass average velocity vector, number of phases of multiphase flow, density and volume fraction of each phase in the multiphase flow;

[0024] The energy equation includes the internal energy per unit mass of each phase of the multiphase flow, the pressure and temperature of the fluid, the volume heat source term of all fluid media, the heat of heat conduction, the effective heat conductivity coefficient of the working medium, the heat conductivity coefficient of each phase of the fluid medium, and the turbulent heat conductivity coefficient determined according to the turbulence model;

[0025] The momentum equation includes body force, mixed viscosity of the multiphase fluid, and drift velocity of each phase in the multiphase fluid.

[0026] Optionally, the calculating of the heat conduction process of the equivalent three-dimensional simulation model during the heat dissipation process includes:

[0027] The heat conduction process of the equivalent three-dimensional simulation model during the heat dissipation process is calculated according to the heat flux density and the material thermal conductivity of the cooler for the offshore wind power tower transformer.

[0028] Optionally, the calculating of the heat convection process of the equivalent three-dimensional simulation model during the heat dissipation process includes:

[0029] Calculate the heat convection process of the equivalent three-dimensional simulation model during the heat dissipation process according to the convection heat transfer coefficient, the fluid medium temperature and the external fluid temperature;

[0030] The convective heat transfer coefficient is calculated based on the oil linear velocity, the structure diameter, the oil kinematic viscosity, the oil specific heat and the oil thermal conductivity.

[0031] Optionally, the calculating of the heat radiation process of the equivalent three-dimensional simulation model during the heat dissipation process includes:

[0032] The heat radiation process of the equivalent three-dimensional simulation model during the heat dissipation process is calculated according to the blackbody surface temperature, blackbody radiation constant and radiation area of ​​the cooler for the offshore wind power tower transformer.

[0033] Optionally, determining the temperature distribution characteristics and temperature distribution variation law of the cooler for the offshore wind power tower transformer during the heat dissipation process according to the turbulent flow simulation result and the flow heat transfer simulation result includes:

[0034] Calculate the turbulent flow simulation results and the flow heat transfer simulation results at different time points using CFD post-processing software to obtain the temperature distribution characteristics of the cooler for the offshore wind power tower transformer at different time points;

[0035] The temperature distribution variation law is obtained according to the temperature distribution characteristics of the cooler for the offshore wind power tower transformer at different time points.

[0036] The beneficial effects of the present application are as follows: first, the present application conducts a detailed analysis of the heat transfer process of the cooler and completes the theoretical modeling of the entire heat conduction and convection heat transfer process; second, based on the coupling relationship between the temperature field and the fluid field in the simulation calculation, the present application provides a heat-fluid coupling calculation method for the cooler structure and the transient behavior of the high-speed fluid; finally, the present application builds the geometric model required for the simulation, and realizes the simulation calculation of the cooler heat dissipation process through parameter setting and meshing steps. Compared with the prior art, the present application can dynamically simulate the temperature field and fluid field inside the cooler through the heat-fluid coupling calculation method combined with multi-physics field modeling, thereby more accurately simulating the dynamic behavior and temperature distribution of the internal fluid in the heat dissipation process of the cooler for the offshore wind power tower transformer, which helps to obtain more reliable heat dissipation, heat flux density and outlet temperature data, as well as the internal temperature distribution of the cooler and the law of fluid movement, and provides a scientific basis for the structural design and optimization of the microchannel brazed cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0038] Figure 1 This is a flow chart of a thermal-fluid coupling simulation method for a cooler for an offshore wind power tower transformer provided in an embodiment of the present application;

[0039] Figure 2 A schematic diagram of a geometric model of a cooler for an offshore wind power tower transformer provided in an embodiment of the present application;

[0040] Figure 3 A schematic diagram of a calculation flow of a heat-flow coupling simulation method for a cooler for an offshore wind power tower transformer provided in an embodiment of the present application;

[0041] Figure 4 A cloud diagram of oil temperature of a cooler for an offshore wind power tower transformer provided in an embodiment of the present application;

[0042] Figure 5 A cross-sectional velocity cloud diagram of a cooler flow channel for an offshore wind power tower transformer provided in an embodiment of the present application;

[0043] Figure 6 This is a temperature cloud diagram of the internal cross-section of a cooler for an offshore wind power tower transformer provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] This application embodiment provides a thermal flow coupling simulation method for a cooler for an offshore wind power tower transformer. Figure 1 , is a flow chart of the method, and the method may include the following steps.

[0046] S101, obtaining an equivalent three-dimensional simulation model of a cooler for an offshore wind power tower transformer.

[0047] S102, loading a mesh model corresponding to the equivalent three-dimensional simulation model in the simulation software.

[0048] S103, performing heat-flow coupling simulation calculation on the equivalent three-dimensional simulation model in the simulation software according to the solver, preset solution parameters and grid model, and obtaining turbulent flow simulation results and flow heat transfer simulation results of the cooler for the offshore wind power tower transformer.

[0049] S104, determining the temperature distribution characteristics and temperature distribution variation law of the cooler for the offshore wind power tower transformer during the heat dissipation process according to the turbulent flow simulation results and the flow heat transfer simulation results.

[0050] The beneficial effects of this embodiment are:

[0051] First, this application conducts a detailed analysis of the heat transfer process of the cooler and completes the theoretical modeling of the entire heat conduction and convection heat transfer process; secondly, based on the coupling relationship between the temperature field and the fluid field in the simulation calculation, this application provides a heat-fluid coupling calculation method for the cooler structure and the transient behavior of the high-speed fluid; finally, this application builds the geometric model required for the simulation, and realizes the simulation calculation of the cooler heat dissipation process through parameter setting and meshing steps. Compared with the prior art, this application can dynamically simulate the temperature field and fluid field inside the cooler through the heat-fluid coupling calculation method combined with multi-physics field modeling, so as to more accurately simulate the dynamic behavior and temperature distribution of the internal fluid in the heat dissipation process of the cooler for the offshore wind power tower transformer, which helps to obtain more reliable heat dissipation, heat flux density and outlet temperature data, as well as the temperature distribution inside the cooler and the law of fluid movement, and provides a scientific basis for the structural design and optimization of microchannel brazed coolers.

[0052] See also Figure 3In step S101, the equivalent three-dimensional simulation model can be a three-dimensional simulation model constructed in proportion to the size of the offshore wind power tower transformer cooler, that is, an equivalent three-dimensional simulation model of the offshore wind power tower transformer cooler constructed at a ratio of 1:1. The offshore wind power tower transformer cooler can be a microchannel brazed cooler or a cooler of other structures, without limitation.

[0053] The model can be created using any 3D modeling software, such as SolidWorks or other modeling software.

[0054] As an example, the model could be Figure 2 The three-dimensional model shown is 480 mm long, 215 mm wide and 420 mm high.

[0055] In step S102, the above-mentioned equivalent three-dimensional simulation model can be imported into finite element analysis software (such as ANSYS software), the equivalent three-dimensional simulation model is initialized in the finite element analysis software and the mesh model corresponding to the equivalent three-dimensional simulation model is loaded. After the mesh model is loaded, the solver used and related solution parameters can be further set. Among them, loading the mesh model can be understood as dividing the equivalent three-dimensional simulation model into a plurality of micro-element meshes in the finite element analysis software.

[0056] In this embodiment, the solver used can be a steady-state pressure-based solver; the solution parameters can include boundary condition parameters, material property parameters and model parameters. The model parameters are used to determine the flow model used in the simulation process. In this embodiment, the model parameters can be set to a turbulence model, that is, the simulation is performed based on the turbulence model. The material property parameters may include the property parameters of the structural materials of the cooler for the offshore wind power tower transformer and the property parameters of the insulating oil used in the cooler, including but not limited to density, specific heat, thermal conductivity, etc., without limitation. The boundary condition parameters are used as constraints in the simulation process, which can be set as needed and will not be described in detail.

[0057] The implementation process of step S103 may include:

[0058] Perform numerical simulation of turbulent flow and flow heat transfer on equivalent three-dimensional simulation models;

[0059] Calculate the heat conduction process of the equivalent three-dimensional simulation model during the heat dissipation process;

[0060] Calculate the heat convection process of the equivalent three-dimensional simulation model during the heat dissipation process;

[0061] Calculate the thermal radiation process of the equivalent three-dimensional simulation model during the heat dissipation process;

[0062] Based on the boundary condition parameters, the thermal-fluid coupling method is used to solve the fluid velocity and temperature distribution.

[0063] When numerically simulating turbulent flow and heat transfer of an equivalent three-dimensional simulation model, the laws of conservation of mass, energy and momentum need to be satisfied. Therefore, numerical simulation of turbulent flow and heat transfer of an equivalent three-dimensional simulation model can be performed based on the continuity equation, energy equation and momentum equation.

[0064] Among them, the continuity equation includes fluid density, mass average velocity vector, number of phases in multiphase flow, density and volume fraction of each phase in multiphase flow;

[0065] The energy equation includes the internal energy per unit mass of each phase of the multiphase flow, the pressure and temperature of the fluid, the volume heat source term of all fluid media, the heat of heat conduction, the effective heat conductivity coefficient of the working medium, the heat conductivity coefficient of each phase of the fluid medium, and the turbulent heat conductivity coefficient determined according to the turbulence model;

[0066] The momentum equation includes volume forces, mixed viscosity of multiphase fluids, and drift velocity of each phase in the multiphase fluid.

[0067] Specifically, the continuity equation calculation formula can be expressed as follows:

[0068]

[0069] ρ represents fluid density, t represents temperature, div() represents the divergence of the vector in the brackets, and u' represents the mass average velocity vector of the fluid. The fluid in this embodiment may refer to the insulating oil contained in the cooler. The fluid density may be the density of the insulating oil contained in the cooler, which may be obtained from the aforementioned material property parameters.

[0070] The mass average velocity vector can be calculated using the following formula (2).

[0071]

[0072] Where n is the number of phases in the multiphase flow, ρ k represents the density of the kth phase fluid in the multiphase flow, a k represents the volume fraction of the kth phase fluid in the multiphase flow, u k ' represents the mass average velocity vector of the kth phase fluid in the multiphase flow. Considering the weak compressibility of the insulating oil, the following formula (3) can be obtained.

[0073]

[0074] Among them, u, v and w represent the components of the mass average velocity vector in the x, y and z directions respectively.

[0075] The energy equation calculation formula can be expressed as follows: (4) and (5).

[0076]

[0077] k off =Σa k (k k +k t ) (5)

[0078] Among them, E k represents the internal energy per unit mass of the k-th phase fluid, represents the Hamiltonian operator, p is the pressure of the fluid, T is the temperature, S E represents the volume heat source term of all fluid media, represents the heat transfer heat, k off Indicates the effective heat transfer coefficient of the working medium, k k represents the thermal conductivity of the k-th phase fluid medium, k t represents the turbulent heat transfer coefficient determined according to the turbulence model.

[0079] The momentum equation calculation formula can be expressed as follows:

[0080]

[0081] Where F' is the body force, μ m is the mixed viscosity of the multiphase fluid, u dr*k ' is the drift velocity of the kth phase, the mixed viscosity and drift velocity can be calculated using the following formulas (7) and (8). Where T represents transposition, g represents gravitational acceleration, p' represents the pressure gradient of the liquid, and ρ m Represents the mixed density of a multiphase fluid.

[0082]

[0083] u dr*k '=u k '-u' (8)

[0084] Among them, u k represents the speed of the kth phase.

[0085] When calculating the heat conduction process of the equivalent three-dimensional simulation model during the heat dissipation process, the heat conduction process of the equivalent three-dimensional simulation model during the heat dissipation process can be specifically calculated based on the heat flux density and the material thermal conductivity of the cooler for the offshore wind power tower transformer.

[0086] Specifically, the heat conduction process can be calculated based on the following formula (9).

[0087] q=-λgradt (9)

[0088] Wherein, q represents the heat flux density, λ is the thermal conductivity of the material used for the cooler of the offshore wind power tower transformer, t represents the temperature, and gradt represents the temperature gradient.

[0089] When calculating the thermal convection process of the equivalent three-dimensional simulation model during the heat dissipation process, the thermal convection process of the equivalent three-dimensional simulation model during the heat dissipation process can be calculated based on the convection heat transfer coefficient, the fluid medium temperature and the external fluid temperature; the convection heat transfer coefficient can be calculated based on the oil linear velocity, the structure diameter, the oil kinematic viscosity, the oil specific heat and the oil thermal conductivity.

[0090] Specifically, the heat convection process can be calculated according to the following formula (10).

[0091] q w =h(T w -T f ) (10)

[0092] Where h represents the convective heat transfer coefficient, T w is the fluid medium temperature in the cooler of the offshore wind power tower transformer, T f is the external fluid temperature, q w Indicates the heat flow of heat exchange.

[0093] The convective heat transfer coefficient h can be calculated using the following formulas (11) to (13).

[0094] h=0.664Re 1 / 2 Pr 1 / 3 λ f ÷d (11)

[0095] Re=vd÷v f (12)

[0096] Pr=ρv f C f ÷λ f (13)

[0097] Where v is the oil velocity of the cooler for offshore wind power tower transformer, d is the structure diameter, and v f is the kinematic viscosity of the oil, C f is the specific heat of oil, λ f is the thermal conductivity of oil, Re is the Reynolds number, and Pr is the Prandtl number.

[0098] The heat radiation process of the equivalent three-dimensional simulation model in the heat dissipation process can be calculated according to the black body surface temperature, black body radiation constant and radiation area of ​​the cooler for the offshore wind power tower transformer. Specifically, the heat radiation process can be calculated according to the following formula (14).

[0099] Φ=AσT 4 (14)

[0100] Wherein, T is the surface temperature of the black body, which is equivalent to the surface temperature of the cooler for the offshore wind power tower transformer in this embodiment, σ is the black body radiation constant, A is the radiation area, that is, the surface area of ​​the cooler for the offshore wind power tower transformer, and Φ is the heat lost by the cooler for the offshore wind power tower transformer through black body radiation.

[0101] In this embodiment, the set boundary conditions can be expressed by the following formula (15).

[0102]

[0103] Among them, q w is the object boundary, i.e., the boundary of the three-dimensional simulation model of the cooler for offshore wind power tower transformer, g(x, y, z, t) is the wall temperature function, Represents the gradient of T along the normal direction.

[0104] Formula (15) gives the heat flux density on the boundary of the equivalent three-dimensional simulation model.

[0105] When solving the fluid velocity and temperature distribution, the instantaneous temperature field can be updated in real time by combining the following formulas (16) and (17). Formula (17) is the three-dimensional steady-state heat conduction differential equation without internal heat source when the thermal conductivity coefficients are all constants.

[0106]

[0107] Among them, c p represents the specific heat at constant pressure, and q represents the heat flow.

[0108] In the process of solving, it is considered that the change of fluid velocity will dynamically affect the spatial distribution of temperature. Conversely, the temperature non-uniformity will also affect the movement speed of the fluid. Therefore, the net heat carried out of the micro-element by the insulating oil fluid can be solved according to the first law of thermodynamics to realize the heat flow coupling in the solution process. The net heat carried out of the micro-element by the insulating oil fluid can be solved by the following formula (18).

[0109]

[0110] φ is the net heat of the microelement brought out by the insulating oil fluid, q mis the mass flow rate, H in H is the relative humidity brought by the fluid flowing into the microelement. out It is the ratio of the fluid flowing out of the microelement. U represents the energy density inside the microelement, that is, the energy per unit volume stored inside the microelement.

[0111] When solving the fluid velocity and temperature distribution, the coupling method can be used to solve the interaction relationship reflected in formula (18) to ensure the accuracy of the results.

[0112] In this embodiment, the finite element analysis software can be used to perform simulation according to time steps, that is, starting from the initial moment, the fluid field and temperature field of the cooler for the offshore wind turbine tower transformer after one time step are simulated to obtain the corresponding simulation results, and then the simulation results after one time step are continued to be simulated based on the simulation results at this time.

[0113] As described in step S103, the simulation results may include turbulent flow simulation results and flow heat transfer simulation results, wherein the turbulent flow simulation results include flow velocity vectors of the insulating oil contained in the cooler at various spatial positions obtained based on the turbulence model simulation, that is, the flow field of the insulating oil contained in the cooler, and the flow heat transfer simulation results may include the temperature of the insulating oil contained in the cooler at various spatial positions, that is, the temperature field of the insulating oil contained in the cooler.

[0114] The implementation of step S104 may include:

[0115] The temperature distribution characteristics of the cooler for wind turbine tower transformers at different time points were obtained by calculating the turbulent flow simulation results and flow heat transfer simulation results at different time points using CFD post-processing software.

[0116] The temperature distribution variation law is obtained based on the temperature distribution characteristics of the cooler used in the wind turbine tower transformer at different time points.

[0117] The CFD post-processing software may be CFD-POST software. In the above embodiment, the CFD-POST software may be used to analyze the temperature distribution characteristics and its dynamic evolution law (i.e., the temperature distribution change law) of the heat dissipation process of the cooler for the offshore wind power tower transformer at different time points, and record the calculation results.

[0118] The present invention successfully and accurately simulates the temperature distribution characteristics and dynamic evolution laws of the heat dissipation process of the cooler for offshore wind turbine tower transformer through heat-flux coupling, realizes the accurate simulation of the internal fluid behavior of the cooler for offshore wind turbine tower transformer, and lays a solid foundation for providing reliable heat dissipation, heat flux density and outlet temperature data.

[0119] For some examples, see Figures 4 to 6 , Figures 4 to 6 The following are simulation results of a specific embodiment. Figure 4 This is the oil temperature cloud diagram of the cooler used in the offshore wind power tower transformer. Figure 5 is the velocity cloud diagram of the cooler flow channel section. Figure 6 This is the internal section temperature cloud diagram. Figure 4 The temperature distribution of the cooling oil inside the cooler for offshore wind turbine tower transformers is shown. The temperature range is approximately from 320K to 360K, where the red area represents the higher temperature part, indicating the heat accumulation area, while the blue area represents the lower temperature, indicating the area with better heat dissipation effect. Figure 5 The velocity distribution in the cooler flow channel is shown, with the velocity ranging from 0 to about 1.166 m / s. Yellow and orange represent areas with higher velocities, mainly concentrated in the inlet and outlet areas, indicating that the flow is more active; while the central part has a lower velocity, which may affect the heat dissipation efficiency. Figure 6 The temperature distribution of the flow channel inside the cooler is shown. A clear temperature gradient is shown on the left and right sides. This temperature difference indicates the heat transfer effect inside the flow channel. The design may be to achieve thermal balance by directing hot oil to the colder area. These results intuitively and scientifically reveal the heat-flow coupling mechanism inside the cooler through the multi-dimensional display of temperature field and fluid flow, which has important reference value for in-depth understanding of the heat dissipation efficiency and performance optimization of the cooler.

[0120] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0121] For the convenience of description, the above system or device is described by dividing it into various modules or units according to its functions. Of course, when implementing this application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0122] It can be known from the description of the above implementation methods that those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be essentially or partly contributed to the prior art in the form of a software product, which can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present application or certain parts of the embodiments.

[0123] Finally, it should be noted that, in this article, relational terms such as first, second, third and fourth 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. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0124] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A thermal-fluid coupling simulation method for a cooler for an offshore wind power tower transformer, characterized in that: include: Obtain an equivalent 3D simulation model of the cooler for offshore wind power tower transformer; Loading a mesh model corresponding to the equivalent three-dimensional simulation model in the simulation software; According to the solver, the preset solution parameters and the grid model, the equivalent three-dimensional simulation model is subjected to a thermal-fluid coupling simulation calculation in the simulation software to obtain a turbulent flow simulation result and a flow heat transfer simulation result of the cooler for the offshore wind power tower transformer; The temperature distribution characteristics and temperature distribution variation rules of the cooler for the offshore wind power tower transformer during the heat dissipation process are determined according to the turbulent flow simulation results and the flow heat transfer simulation results.

2. The method according to claim 1, characterized in that The equivalent three-dimensional simulation model is a three-dimensional simulation model constructed in proportion to the size of the cooler for the offshore wind power tower transformer.

3. The method according to claim 1, characterized in that The cooler for the offshore wind power tower transformer is a microchannel brazing cooler.

4. The method according to claim 1, characterized in that: The solver is a steady-state pressure-based solver; The solution parameters include boundary condition parameters, material property parameters and model parameters, and the model parameters are turbulence models.

5. The method according to claim 1, characterized in that The method of performing heat-flow coupling simulation calculation on the equivalent three-dimensional simulation model in the simulation software according to the solver, the preset solution parameters and the grid model includes: Performing numerical simulation of turbulent flow and flow heat transfer on the equivalent three-dimensional simulation model; Calculating the heat conduction process of the equivalent three-dimensional simulation model during the heat dissipation process; Calculating the heat convection process of the equivalent three-dimensional simulation model during the heat dissipation process; Calculating the thermal radiation process of the equivalent three-dimensional simulation model during the heat dissipation process; Based on the boundary condition parameters, the thermal-fluid coupling method is used to solve the fluid velocity and temperature distribution.

6. The method according to claim 5, characterized in that The performing of turbulent flow and flow heat transfer numerical simulation on the equivalent three-dimensional simulation model comprises: Performing numerical simulation of turbulent flow and flow heat transfer on the equivalent three-dimensional simulation model according to the continuity equation, energy equation and momentum equation; Wherein, the continuity equation includes fluid density, mass average velocity vector, number of phases of multiphase flow, density and volume fraction of each phase in the multiphase flow; The energy equation includes the internal energy per unit mass of each phase of the multiphase flow, the pressure and temperature of the fluid, the volume heat source term of all fluid media, the heat of heat conduction, the effective heat conductivity coefficient of the working medium, the heat conductivity coefficient of each phase of the fluid medium, and the turbulent heat conductivity coefficient determined according to the turbulence model; The momentum equation includes body force, mixed viscosity of the multiphase fluid, and drift velocity of each phase in the multiphase fluid.

7. The method according to claim 5, characterized in that The calculating of the heat conduction process of the equivalent three-dimensional simulation model during the heat dissipation process includes: The heat conduction process of the equivalent three-dimensional simulation model during the heat dissipation process is calculated according to the heat flux density and the material thermal conductivity of the cooler for the offshore wind power tower transformer.

8. The method according to claim 5, characterized in that The calculating of the heat convection process of the equivalent three-dimensional simulation model during the heat dissipation process includes: Calculate the heat convection process of the equivalent three-dimensional simulation model during the heat dissipation process according to the convection heat transfer coefficient, the fluid medium temperature and the external fluid temperature; The convective heat transfer coefficient is calculated based on the oil linear velocity, the structure diameter, the oil kinematic viscosity, the oil specific heat and the oil thermal conductivity.

9. The method according to claim 5, characterized in that The calculating of the heat radiation process of the equivalent three-dimensional simulation model during the heat dissipation process includes: The heat radiation process of the equivalent three-dimensional simulation model during the heat dissipation process is calculated according to the blackbody surface temperature, blackbody radiation constant and radiation area of ​​the cooler for the offshore wind power tower transformer.

10. The method according to claim 1, characterized in that The determining of the temperature distribution characteristics and temperature distribution variation law of the cooler for the offshore wind power tower transformer during the heat dissipation process according to the turbulent flow simulation result and the flow heat transfer simulation result includes: Calculate the turbulent flow simulation results and the flow heat transfer simulation results at different time points using CFD post-processing software to obtain the temperature distribution characteristics of the cooler for the offshore wind power tower transformer at different time points; The temperature distribution variation law is obtained according to the temperature distribution characteristics of the cooler for the offshore wind power tower transformer at different time points.

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