Electric drive system winding end spraying simulation method and device and computer equipment

Abstract

The invention relates to an electric drive system winding end spraying simulation method and device, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: importing a winding end part three-dimensional model into a simulation system, and carrying out Boolean extraction on the winding end part three-dimensional model by adopting a preset boundary domain model; discretizing the extracted three-dimensional model to obtain a discretized three-dimensional model; and carrying out spraying simulation on the discretized three-dimensional model by adopting a simulation model matched with the simulation requirement to obtain a spraying simulation result. By adopting the method, the simulation result precision can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicle simulation, and in particular to a method, device and computer equipment for simulating the spraying of winding ends of an electric drive system. Background Art

[0002] At present, the end of the flat wire winding of the electric drive system of new energy vehicles is mostly cooled by direct oil spraying. Compared with indirect water cooling or other cooling methods, this method has a short heat transfer path, high cooling efficiency, and rapid temperature control effect. The actual oil-soaked surface structure of the flat wire winding end of the electric drive system is complex, and the curvature of the cooling oil flow path changes drastically, resulting in uneven local temperature and cooling efficiency distribution; the fluid flow in the winding end area is significantly affected by the geometric shape, and it is necessary to ensure that the fluid flows effectively in a narrow space and takes away heat, and correctly simulate and restore the end spray cooling process.

[0003] At present, there are two mainstream methods in the industry for CFD (Computational Fluid Dynamics) simulation of the ends of flat wire windings in electric drive systems. One is the "equivalent ring" CFD simulation, the principle of which is that the detailed geometric structure of the winding ends is simplified into a smooth ring, which cannot accurately reflect the multi-layer structure and complex end shape of the winding, resulting in inaccurate results. The second is the "SPH (Smoothed Particle Hydrodynamics) smooth particle method". When simulating the CFD high-speed field of the ends of multi-layer flat wire windings or the fluid structure with violent splash changes, the SPH method needs to introduce a high numerical viscosity, which will affect the accuracy and authenticity of the simulation. In addition, the SPH smooth particle method is based on the Lagrangian offline solution principle for iteration. In the long-term simulation, the process may accumulate large errors, especially when dealing with complex winding end fluid interactions and reactions. Error control and correction will be the biggest pain point of this method. Therefore, the simulation development of the ends of flat wire windings in traditional electric drive systems has the problem of low simulation result accuracy. Summary of the invention

[0004] Based on this, it is necessary to provide an electric drive system winding end spray simulation method, device, computer equipment, computer readable storage medium and computer program product that can provide accurate simulation results to address the above technical problems.

[0005] In a first aspect, the present application provides a method for simulating spraying of winding ends of an electric drive system, comprising:

[0006] The three-dimensional model of the winding end is imported into the simulation system, and the three-dimensional model of the winding end is subjected to Boolean extraction using a preset boundary domain model;

[0007] Discretizing the extracted three-dimensional model to obtain a discretized three-dimensional model;

[0008] The simulation model that matches the simulation requirements is used to perform spray simulation on the discretized three-dimensional model to obtain the spray simulation results.

[0009] In one embodiment, a preset boundary domain model is used to perform Boolean extraction on the three-dimensional model of the winding end, including:

[0010] Check the 3D model of the winding end for geometric problems;

[0011] If there is a geometric problem, the geometric problem is repaired to obtain a repaired three-dimensional model;

[0012] The preset boundary domain model is used to perform Boolean extraction on the repaired 3D model.

[0013] In one embodiment, a preset boundary domain model is used to perform Boolean extraction on the three-dimensional model of the winding end, including:

[0014] Along the axis of the three-dimensional model of the winding end, the asymmetric part of the three-dimensional model of the winding end is symmetrically processed to obtain a simplified three-dimensional model;

[0015] The preset boundary domain model is used to perform Boolean extraction on the simplified three-dimensional model.

[0016] In one embodiment, a simulation model matching the simulation requirements is used to perform spray simulation on the discretized three-dimensional model to obtain a spray simulation result, including:

[0017] Determine the numerical calculation algorithm according to simulation requirements;

[0018] The distribution of the convective heat transfer coefficient is obtained by using a numerical calculation algorithm according to the discretized three-dimensional model and the initial spray data; the initial spray data includes at least one of the initial inlet velocity, the initial outlet pressure and the initial wall temperature;

[0019] The spray simulation results are determined based on the distribution of convective heat transfer coefficients.

[0020] In one embodiment, determining the spray simulation result based on the distribution of the convective heat transfer coefficient includes:

[0021] During the spray simulation process, the inlet angle of the discretized three-dimensional model is adjusted, and the distribution of the convective heat transfer coefficient at each inlet angle is calculated;

[0022] The spray simulation results are determined based on the distribution of convective heat transfer coefficients at multiple inlet angles; the spray simulation results are used to determine the spray angle.

[0023] In one embodiment, determining the spray simulation result based on the distribution of the convective heat transfer coefficient includes:

[0024] During the spray simulation process, the spray data is adjusted, and the distribution of the convective heat transfer coefficient corresponding to each adjusted spray data is calculated; the spray data includes at least one of the inlet velocity, the outlet pressure and the wall temperature;

[0025] The spray simulation result is determined based on the distribution of convective heat transfer coefficients corresponding to the multiple adjusted spray data; and the spray simulation result is used to determine the target spray data.

[0026] In a second aspect, the present application also provides a winding end spray simulation device for an electric drive system, comprising:

[0027] An extraction module, used for importing the three-dimensional model of the winding end into the simulation system, and performing Boolean extraction on the three-dimensional model of the winding end using a preset boundary domain model;

[0028] A discretization module is used to discretize the extracted three-dimensional model to obtain a discretized three-dimensional model;

[0029] The simulation module is used to perform spray simulation on the discretized three-dimensional model using a simulation model that matches the simulation requirements to obtain a spray simulation result.

[0030] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0031] The three-dimensional model of the winding end is imported into the simulation system, and the three-dimensional model of the winding end is subjected to Boolean extraction using a preset boundary domain model;

[0032] Discretizing the extracted three-dimensional model to obtain a discretized three-dimensional model;

[0033] The simulation model that matches the simulation requirements is used to perform spray simulation on the discretized three-dimensional model to obtain the spray simulation results.

[0034] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0035] The three-dimensional model of the winding end is imported into the simulation system, and the three-dimensional model of the winding end is subjected to Boolean extraction using a preset boundary domain model;

[0036] Discretizing the extracted three-dimensional model to obtain a discretized three-dimensional model;

[0037] The simulation model that matches the simulation requirements is used to perform spray simulation on the discretized three-dimensional model to obtain the spray simulation results.

[0038] In a fifth aspect, the present application further provides a computer program product, including a computer program, which implements the following steps when executed by a processor:

[0039] The three-dimensional model of the winding end is imported into the simulation system, and the three-dimensional model of the winding end is subjected to Boolean extraction using a preset boundary domain model;

[0040] Discretizing the extracted three-dimensional model to obtain a discretized three-dimensional model;

[0041] The simulation model that matches the simulation requirements is used to perform spray simulation on the discretized three-dimensional model to obtain the spray simulation results.

[0042] The above-mentioned electric drive system winding end spray simulation method, device, computer equipment, computer-readable storage medium and computer program product use a preset boundary domain model to perform Boolean extraction on the three-dimensional model of the winding end imported into the simulation system. The extracted three-dimensional model is the three-dimensional model corresponding to the fluid area of ​​the flat wire winding end, which realizes the separate simulation of the fluid area of ​​the flat wire winding end, which is conducive to accurately simulating the thermal management function of the fluid area; the extracted three-dimensional model is discretized, and then a simulation model matching the simulation requirements is used to perform spray simulation on the discretized three-dimensional model, so that an accurate spray simulation effect of the flat wire winding end can be obtained in a relatively short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 2. It is a diagram of the application environment of the winding end spraying simulation method of the electric drive system in one embodiment;

[0045] Figure 2 A schematic diagram of a flow chart of a method for simulating spraying of winding ends of an electric drive system in one embodiment;

[0046] Figure 3 is a schematic diagram of a three-dimensional model of a spray stator winding in one embodiment;

[0047] Figure 4 is a schematic diagram of a three-dimensional model of a winding end in another embodiment;

[0048] Figure 5 is a schematic diagram of a boundary domain model in one embodiment;

[0049] Figure 6 A schematic diagram of symmetric processing in one embodiment;

[0050] Figure 7 is a schematic diagram of symmetric processing in another embodiment;

[0051] Figure 8 A schematic diagram of the effect of spray simulation in one embodiment;

[0052] Fig. 9 is a partially enlarged schematic diagram of a three-dimensional model of a winding end in one embodiment;

[0053] Fig.10 Schematic diagram of the distribution of convective heat transfer coefficients at different spray angles in one embodiment;

[0054] Fig.11 It is a schematic diagram of the distribution of convective heat transfer coefficients at different fluid flow rates in one embodiment;

[0055] Fig.12 It is a schematic diagram of the distribution of convective heat transfer coefficient at different wall temperatures in one embodiment;

[0056] Fig.13 Schematic diagram of the overall process of a method for simulating spraying of winding ends of an electric drive system in one embodiment;

[0057] Fig.14 A schematic diagram of a flow chart prepared for a fluid computational domain in one embodiment;

[0058] Fig.15 A schematic diagram of a flow chart of a fluid domain simplification method in one embodiment;

[0059] Fig.16 It is a structural block diagram of a winding end spray simulation device of an electric drive system in one embodiment;

[0060] Fig.17 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0062] At present, the ends of the flat wire windings of the electric drive system of new energy vehicles are mostly cooled by spray direct oil cooling. Compared with indirect water cooling or other cooling methods, this method has a short heat transfer path, high cooling efficiency, and rapid temperature control effect. The ends of the flat wire windings of the electric drive system of new energy vehicles have the following characteristics: 1. High temperature concentration: The flat wire windings are subjected to high currents in the electric drive system, especially at the ends. The close arrangement of the conductors and the current concentration cause a significant increase in temperature. Since the ends are the connection points of the coils, the current conversion and magnetic field distribution are more dense in these areas, thereby generating more heat. 2. High spray cooling efficiency: The spray cooling system can directly spray the cooling medium (usually oil) onto the hot spots of the windings. This direct contact method can quickly reduce the temperature and improve the cooling efficiency. Through the end oil spraying technology, the motor winding temperature can be reduced by more than 68%, greatly improving the power density and efficiency of the motor. 3. Design trend: With the high performance requirements of electric vehicles and new energy models, the high efficiency and high load operation of the motor have become the design focus. The end windings have greater thermal management challenges, so the use of spray cooling has become an effective solution.

[0063] The difficulty in developing CFD simulations of flat wire ends in traditional electric drive systems lies mainly in the distribution of local heat dissipation temperature and cooling efficiency. The actual oil-wetted surface structure of the winding end is complex, and the curvature of the cooling oil flow path changes dramatically, resulting in uneven local temperature and cooling efficiency distribution; the fluid flow in the winding end area is significantly affected by the geometric shape, and it is necessary to ensure that the fluid flows effectively in a narrow space and takes away heat, and correctly simulate and restore the end spray cooling process. There are currently two mainstream methods for CFD simulation of flat wire ends in the industry. One is the "equivalent circular ring" CFD simulation. The principle is that the detailed geometric structure of the winding end is simplified into a smooth circular ring, which cannot accurately reflect the multi-layer structure and complex end shape of the winding, resulting in inaccurate results. The simplified smooth circular ring structure is difficult to simulate the actual flow and heat conduction of the fluid in the winding, and cannot present the risk of eddy currents or local overheating, which affects the spray cooling design. The second is the "SPH smooth particle method", which has high computational cost: the SPH method is used for CFD of multi-layer flat wire winding ends. In order to improve the resolution of the simulation results, the radius of the smoothing example is usually set small (0.5~1mm), and the number of particles required is extremely high. The simulation process involves the interactive calculation of a large number of particles, which leads to a smaller solution step size, more computing time and stronger memory requirements than the traditional finite element FEM method. When simulating the high-speed field of the CFD of the multi-layer flat wire winding ends or the fluid structure with violent splash changes, the SPH method needs to introduce a higher numerical viscosity, which will affect the accuracy and authenticity of the simulation. In long-term simulation, the "SPH smooth particle method is based on the Lagrangian offline solution principle for iteration, and its process may accumulate large errors. Especially when dealing with complex winding end fluid interactions and reactions, error control and correction will be the biggest pain point for the application of this method. Therefore, the traditional CFD simulation method for the multi-layer flat wire winding ends of electric drive systems has the following limitations: poor process reproducibility, low simulation result accuracy, long calculation solution time, low efficiency, high cost, and difficulty in iterative optimization of product solutions.

[0064] Based on this, an embodiment of the present application proposes a method for simulating the spraying of the winding ends of an electric drive system with high simulation result accuracy. The method uses a preset boundary domain model to perform Boolean extraction on the three-dimensional model of the winding ends imported into the simulation system. The extracted three-dimensional model is the three-dimensional model corresponding to the fluid region of the flat wire winding end, thereby realizing a separate simulation of the fluid region of the flat wire winding end, which is beneficial to accurately simulate the thermal management function of the fluid region. The extracted three-dimensional model is discretized, and then a simulation model matching the simulation requirements is used to perform spraying simulation on the discretized three-dimensional model, thereby obtaining an accurate spraying simulation effect of the flat wire winding end in a relatively short time.

[0065] The electric drive system winding end spray simulation method provided in the embodiment of the present application can be applied to Figure 1In the application environment shown. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store the data that the server 104 needs to process. The data storage system can be integrated on the server 104, or it can be placed on the cloud or other network servers. This embodiment uses the method applied to the terminal 102 as an example. It can be understood that the method can also be applied to the server, and can also be applied to the system including the terminal and the server, and is realized through the interaction between the terminal and the server. The terminal 102 imports the three-dimensional model of the winding end into the simulation system, and uses the preset boundary domain model to perform Boolean extraction on the three-dimensional model of the winding end; discretizes the extracted three-dimensional model to obtain a discretized three-dimensional model; and uses a simulation model that matches the simulation requirements to perform spray simulation on the discretized three-dimensional model to obtain a spray simulation result. Among them, the terminal 102 can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, Internet of Things devices and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart car-mounted devices, projection devices, etc. Portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. The head mounted device may be a virtual reality (VR) device, an augmented reality (AR) device, smart glasses, etc. The server 104 may be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.

[0066] In an exemplary embodiment, Figure 2 As shown in the figure, a simulation method for spraying the winding ends of an electric drive system is provided. Figure 1 The terminal 102 in the example is used as an example to illustrate, including the following steps 202 to 206. Among them:

[0067] Step 202: import the three-dimensional model of the winding end into the simulation system, and use a preset boundary domain model to perform Boolean extraction on the three-dimensional model of the winding end.

[0068] The winding end refers to the end of the flat wire winding of the electric control system of the new energy vehicle. A three-dimensional model of the winding end can be obtained by constructing a three-dimensional structure according to the structural parameters of the winding end. For example, a precise three-dimensional model of the winding end, i.e., a three-dimensional model of the winding end, can be generated by using three-dimensional CAD software.

[0069] like Figure 3 FIG. 1 is a schematic diagram of a three-dimensional model of a spray stator winding in one embodiment. In the figure, the flat wire winding in the three-dimensional model of the spray stator winding is three-dimensionally surrounded by the stator. Figure 4 FIG. 4 is a schematic diagram of a three-dimensional model of a winding end in another embodiment.

[0070] The simulation system refers to a system for spraying simulation of the three-dimensional model of the winding end, for example, it can be a CFD system. The boundary domain model refers to a three-dimensional model preset in the simulation system. For example, the boundary domain model can be generated by setting corresponding parameters in the simulation system according to the geometric shape of the winding end. Figure 5 FIG. 5 is a schematic diagram of a boundary domain model in an embodiment, wherein 502 represents the boundary domain model, and 504 represents the three-dimensional model of the winding end.

[0071] The terminal performs Boolean operations on the boundary domain model and the three-dimensional model of the winding end to obtain the extracted three-dimensional model. Boolean extraction is helpful to extract the fluid area in the three-dimensional model of the winding end, that is, the area where the fluid actually flows, so as to perform accurate simulation of the fluid area.

[0072] Step 204: discretize the extracted three-dimensional model to obtain a discretized three-dimensional model.

[0073] Discretization refers to meshing or finite element partitioning of the extracted three-dimensional model. For example, the extracted three-dimensional model is imported into a preset meshing software, and the extracted three-dimensional model is meshed to obtain a meshed three-dimensional model as a discretized three-dimensional model.

[0074] Among them, due to the need to retain a good surface curvature of the winding end, the minimum grid size for the winding end is generally selected to be 0.05~0.1mm, and the basic grid size is 1mm, which is convenient for detailed and high-precision restoration of the end flow field simulation. When dividing the body mesh, it is necessary to pay attention to ensuring that the body mesh of all parts of the part has at least two layers of boundary layers. The number of boundary layers can be set in the meshing software. A single-layer body mesh will report an error in the three-dimensional thermal simulation.

[0075] The terminal obtains the discretized three-dimensional model from the grid division software and imports it into the simulation system, wherein the discretized three-dimensional model is exported in a volume grid format recognizable by the simulation system as a grid model file of the flow field simulation system.

[0076] Step 206 , using a simulation model that matches the simulation requirements to perform spray simulation on the discretized three-dimensional model to obtain a spray simulation result.

[0077] The simulation requirement refers to the requirement for spraying simulation on the ends of flat wire windings. The simulation system can provide various forms of simulation. For the spraying simulation requirement on the ends of flat wire windings, the terminal can determine the simulation model corresponding to the simulation requirement to perform spraying simulation on the discrete three-dimensional model.

[0078] The spray simulation result is the simulated distribution of the convective heat transfer coefficient at the end of the flat wire winding. Based on the spray simulation result, the distribution and cooling effect of the spray fluid at the end of the flat wire winding can be reflected.

[0079] In the above-mentioned electric drive system winding end spray simulation method, a preset boundary domain model is used to perform Boolean extraction on the three-dimensional model of the winding end imported into the simulation system. The extracted three-dimensional model is the three-dimensional model corresponding to the fluid area of ​​the flat wire winding end, thereby realizing a separate simulation of the fluid area of ​​the flat wire winding end, which is beneficial to accurately simulate the thermal management function of the fluid area; the extracted three-dimensional model is discretized, and then a simulation model matching the simulation requirements is used to perform spray simulation on the discretized three-dimensional model, so that an accurate spray simulation effect of the flat wire winding end can be obtained in a relatively short time.

[0080] In an exemplary embodiment, a preset boundary domain model is used to perform Boolean extraction on the three-dimensional model of the winding end, including: checking the three-dimensional model of the winding end for geometric problems; if there are geometric problems, repairing the geometric problems to obtain a repaired three-dimensional model; and using the preset boundary domain model to perform Boolean extraction on the repaired three-dimensional model.

[0081] Among them, the geometric problem check refers to checking the geometric errors in the three-dimensional model of the winding end, such as crossing errors, puncture errors, etc.

[0082] After the geometric problem check, a geometric problem check result is obtained. If the geometric problem check result is that there is a geometric problem, the geometric problem is repaired from the winding end three-dimensional model to obtain a repaired three-dimensional model. The repair method can use repair software for automatic repair, manual repair, or a repair method combining repair software and manual repair.

[0083] The terminal uses a preset boundary domain model to perform Boolean extraction on the repaired three-dimensional model, which is beneficial to improving the accuracy of the model and ensuring the effective extraction of the fluid area.

[0084] If the result of the geometric problem check is that there is no geometric problem, the preset boundary domain model is directly used to perform Boolean extraction on the three-dimensional model of the winding end.

[0085] In this embodiment, the three-dimensional model of the winding end is checked for geometric problems. If any geometric problems exist, the geometric problems are repaired, and then a preset boundary domain model is used to perform Boolean extraction on the repaired three-dimensional model, which is beneficial to improving the accuracy of the model and ensuring the effective extraction of the fluid area.

[0086] In an exemplary embodiment, a preset boundary domain model is used to perform Boolean extraction on the three-dimensional model of the winding end, including: symmetrically processing the asymmetric part of the three-dimensional model of the winding end along the axis of the three-dimensional model of the winding end to obtain a simplified three-dimensional model; and using the preset boundary domain model to perform Boolean extraction on the simplified three-dimensional model.

[0087] Among them, since the winding end is a geometrically axially symmetrical structure, the axis of the three-dimensional model of the winding end corresponds to the symmetry axis of the winding end. Therefore, the embodiment of the present application proposes to simplify the three-dimensional model of the winding end by mirroring along the axis. Figure 6 The figure shows a schematic diagram of symmetric processing in an embodiment. The two ends of the flat wire winding can be regarded as symmetrical structures. The two ends of the flat wire winding include a first end and a second end. The second end can be obtained by symmetric processing of the first end. Figure 7 The figure shows a schematic diagram of symmetric processing in another embodiment, wherein one end of the flat wire winding can be regarded as a symmetrical structure alone, the first end of the flat wire winding includes a first part and a second part, and the second part of the first end can be obtained by symmetric processing of the first part of the first end.

[0088] As can be seen above, after two symmetric processes of the first part of the winding end, a simplified three-dimensional model can be obtained. Spray simulation is performed based on the simplified three-dimensional model, which may involve removing or ignoring small features that have little effect on fluid flow, such as small threads, sharp angles, etc. The terminal can check whether the simplified three-dimensional model is consistent with the original three-dimensional model of the winding end in key fluid dynamics characteristics to ensure that the simplified three-dimensional model can accurately reflect the key features of the actual flow, such as velocity gradient, pressure distribution, etc. It will be verified that the simplified three-dimensional model is suitable for CFD simulation formats, such as STEP (Standard for the Exchange of Product ModelData, product model data exchange standard) or IGES (Industrial Graphics Exchange Specification, an international standard data exchange format), which can be used to create meshes and set simulation parameters.

[0089] In this embodiment, the asymmetric part of the three-dimensional model of the winding end is symmetrically processed along the axis to simplify the three-dimensional model of the winding end. The simplified three-dimensional model is consistent with the original three-dimensional model of the winding end in key fluid dynamics characteristics. In addition, by identifying the symmetric characteristics of the fluid domain, the simulation model is reasonably simplified to reduce the calculation complexity, thereby reducing the simulation time and cost, which is conducive to improving the simulation efficiency. On the basis of ensuring accuracy, the spray simulation results are quickly provided to provide effective data support for optimizing the flat wire winding spray design scheme.

[0090] In an exemplary embodiment, a simulation model that matches the simulation requirements is used to perform spray simulation on a discretized three-dimensional model to obtain a spray simulation result, including: determining a numerical calculation algorithm according to the simulation requirements; obtaining a distribution of convective heat transfer coefficient using a numerical calculation algorithm according to the discretized three-dimensional model and initial spray data; the initial spray data includes at least one of an initial inlet velocity, an initial outlet pressure, and an initial wall temperature; and determining a spray simulation result based on the distribution of convective heat transfer coefficient.

[0091] The numerical calculation algorithm is the simulation model. In some embodiments, the terminal pre-stores a mapping relationship between the simulation requirements and the numerical calculation algorithm, and by querying the mapping relationship, the numerical calculation algorithm corresponding to the simulation requirement can be determined.

[0092] The initial spray data refers to the parameters preset by the simulation system, which are used to enter the numerical calculation algorithm to calculate the convective heat transfer coefficient of each position point in the discretized three-dimensional model. The distribution of the convective heat transfer coefficient is the distribution of the convective heat transfer coefficient of each position point. Figure 8 FIG. 1 is a schematic diagram showing the effect of spray simulation in one embodiment. Fig. 9 Shown is a partially enlarged schematic diagram of a three-dimensional model of a winding end in one embodiment.

[0093] The distribution of the convective heat transfer coefficient can reflect the distribution and cooling effect of the spray fluid at the end of the flat wire winding. Therefore, the terminal can directly use the distribution of the convective heat transfer coefficient as the spray simulation result. It can also further optimize the spray effect based on the distribution of the convective heat transfer coefficient to obtain the final spray simulation result.

[0094] In this embodiment, the distribution of the convective heat transfer coefficient is determined by adopting the numerical calculation algorithm and initial spray data corresponding to the simulation requirements, so as to obtain the spray simulation result. In this way, by simulating the flow rate, direction, and vortex in the actual spray cooling process, it is beneficial to obtain key parameters such as the cooling oil distribution, which is beneficial to evaluate the design performance of the spray strategy and the winding structure.

[0095] In an exemplary embodiment, a spray simulation result is determined based on the distribution of convective heat transfer coefficient, including: during the spray simulation process, adjusting the inlet angle of the discretized three-dimensional model, and calculating the distribution of convective heat transfer coefficient at each inlet angle; determining the spray simulation result based on the distribution of convective heat transfer coefficient at multiple inlet angles; the spray simulation result is used to determine the spray angle.

[0096] Among them, by adjusting the inlet angle of the discretized three-dimensional model, it is equivalent to simulating the spray angle in the actual spraying process. The terminal calculates the distribution of the convective heat transfer coefficient at each inlet angle, and determines the target inlet angle with the best cooling effect based on multiple convective heat transfer coefficient distributions. The terminal uses the direction indicated by the target inlet angle as the spray angle, which is conducive to achieving the best cooling effect in actual spraying. Fig.10 The figure shows a schematic diagram of the distribution of convective heat transfer coefficients at different spray angles in one embodiment.

[0097] The terminal can directly use the distribution of convective heat transfer coefficients at multiple inlet angles as the spray simulation result, and can also use the target inlet angle or spray angle as the spray simulation result.

[0098] In this embodiment, by adjusting the inlet angle of the discretized three-dimensional model and repeatedly adjusting the distribution of the convective heat transfer coefficients obtained by each calculation, the target inlet angle with the best cooling effect can be determined. This is conducive to determining the spray angle with the best cooling effect, which is conducive to guiding the actual spray strategy.

[0099] In an exemplary embodiment, a spray simulation result is determined based on a convective heat transfer coefficient distribution, including: during the spray simulation process, the spray data is adjusted, and the convective heat transfer coefficient distribution corresponding to each adjusted spray data is calculated; the spray data includes at least one of an inlet velocity, an outlet pressure, and a wall temperature; the spray simulation result is determined based on the convective heat transfer coefficient distribution corresponding to a plurality of adjusted spray data; the spray simulation result is used to determine the target spray data.

[0100] Among them, the spray data includes at least one of the inlet velocity, outlet pressure and wall temperature. During the spray simulation process, any one or more of the spray data can be adjusted, and the convective heat transfer coefficient distribution corresponding to the adjusted spray data can be calculated. Among them, the adjustment of the inlet velocity is equivalent to the adjustment of the fluid flow rate of the simulated spray, so that the convective heat transfer coefficient distribution corresponding to the different adjusted inlet velocities can characterize the convective heat transfer coefficient distribution under different fluid flow rates. The terminal can determine the target inlet velocity with the best cooling effect based on the convective heat transfer coefficient distribution corresponding to each of the multiple adjusted inlet velocities, and the corresponding target fluid flow rate can be determined by the target inlet velocity. Fig.11Shown is a schematic diagram of the distribution of convective heat transfer coefficients at different fluid flow rates in one embodiment.

[0101] The terminal can directly use the distribution of convective heat transfer coefficients corresponding to the multiple adjusted inlet velocities as the spray simulation result, and can also use the target inlet velocity or the target fluid flow rate as the spray simulation result.

[0102] Among them, the adjustment of the wall temperature is equivalent to simulating the surface temperature change of the flat wire winding in the actual spraying. The terminal determines the target wall temperature with the best cooling effect from the distribution of convection heat transfer coefficients corresponding to multiple adjusted wall temperatures. Fig.12 Shown is a schematic diagram of the distribution of convective heat transfer coefficients at different wall temperatures in one embodiment.

[0103] The terminal can directly use the distribution of convective heat transfer coefficients corresponding to multiple adjusted wall temperatures as the spray simulation result, and can also use the target wall temperature as the spray simulation result.

[0104] In this embodiment, by adjusting a single or multiple spray data, the distribution of convective heat transfer coefficient corresponding to each adjustment is obtained. By adjusting the spray data, it is helpful to determine the spray data with the best cooling effect, which is helpful to guide the actual spray strategy.

[0105] In order to explain in detail the simulation method and effect of the winding end spraying of the electric drive system in this solution, the following is a most detailed embodiment:

[0106] This paper takes the spray simulation scenario of the flat wire winding end of the electric drive system of new energy vehicles as an example. Fig.13 The figure shows a schematic diagram of the overall process of a method for simulating the spraying of winding ends of an electric drive system in one embodiment. The method for simulating the spraying of winding ends of an electric drive system mainly includes:

[0107] 1. 3D model import: Use CAD software or other modeling tools to import the 3D model of the winding end into the CFD simulation system to ensure the accuracy of the model and provide a basis for subsequent simulation processes.

[0108] 2. Geometric model error check: Before simulation calculation, the three-dimensional model of the winding end is checked for geometric problems, and potential problems such as redundant faces, repeated faces, hollow bodies, overlapping entities, etc. are repaired to ensure model integrity and free of geometric errors.

[0109] 3. Preparation of fluid calculation domain: After importing the model, use the preset boundary domain model to perform Boolean extraction on the three-dimensional model of the winding end to complete the model extraction of the fluid area. Fig.14 The figure is a schematic diagram of the flow of fluid calculation domain preparation in one embodiment.

[0110] 4. Meshing: Discretize the extracted 3D model to generate a discretized 3D model to ensure detailed restoration of fluid flow and spraying phenomena. You can use professional meshing commercial software to mesh and divide the finite element or finite volume mesh.

[0111] (1) Importing the extracted three-dimensional model: This step is to import the extracted three-dimensional model into the finite element meshing software to prepare for finite element meshing; (2) Model volume meshing: This step is to perform volume meshing on the extracted three-dimensional model. When performing volume meshing, it is necessary to ensure that the volume mesh of all parts of the part has at least two boundary layers (a single-layer volume mesh will report an error in three-dimensional thermal simulation); (3) Defining the volume mesh size: This step is to define the mesh size of the extracted three-dimensional model. Since it is necessary to retain a good surface curvature of the winding end, the minimum mesh size for the winding end is generally selected as 0.05~0.1mm, and the basic mesh size is 1mm, which is convenient for detailed and high-precision restoration of the end flow field simulation; (4) Exporting the mesh file: This step is to export the volume mesh of the defined face group in a volume mesh format that can be recognized by the flow field simulation as a mesh model file for the flow field simulation.

[0112] 5. Algorithm matching: According to the simulation requirements, select the appropriate numerical calculation algorithm to ensure that the CFD simulation process is accurate and stable, and suitable for the spray simulation of the electric drive flat wire winding. Generally, the vof-unsteady multiphase flow simulation model is used for calculation.

[0113] 6. Boundary conditions and initialization parameter settings: Set reasonable boundary conditions, including inlet velocity, outlet pressure, wall temperature and other parameters to ensure simulation of real conditions. According to the initial model, set the initial inlet velocity, initial outlet pressure, initial wall temperature and other variables for the simulation.

[0114] 7. CFD spray simulation: Use CFD software to simulate the fluid flow process of the spray system. Use finite element method and turbulence model to simulate and study the distribution and cooling effect of the spray fluid at the winding end.

[0115] 8. Simulation convergence and iteration cycle estimation: During the calculation, monitor the iteration convergence and adjust the iteration cycle to ensure that the calculation results are accurate and stable.

[0116] 9. Simulation result output: Summarize the main data of CFD simulation process, including temperature, velocity and pressure distribution, etc. Export the results into graphics and data reports for analysis and design improvement.

[0117] In addition, the present application embodiment proposes a fluid domain simplification method, such as Fig.15 FIG. 4 is a flow chart of a fluid domain simplification method in one embodiment.

[0118] 1. Import the 3D model of the motor, especially the geometry of the end windings.

[0119] 2. A simplified model of the fluid boundary is constructed, and the mirror simplification method is adopted to reduce the complexity of the model through symmetry, thereby simplifying the calculation process.

[0120] 3. Use the mirror simplification method to construct a simplified three-dimensional model.

[0121] 4. After the simplified three-dimensional model is constructed, the model matching arrangement is carried out to ensure that the simplified three-dimensional model matches the actual winding geometry and position to ensure the accuracy of the model.

[0122] The above-mentioned electric drive system winding end spray simulation method uses a preset boundary domain model to perform Boolean extraction on the winding end three-dimensional model imported into the simulation system. The extracted three-dimensional model is the three-dimensional model corresponding to the fluid area of ​​the flat wire winding end, which realizes the separate simulation of the fluid area of ​​the flat wire winding end, which is conducive to accurately simulating the thermal management function of the fluid area; the extracted three-dimensional model is discretized, and then the discrete three-dimensional model is sprayed using a simulation model that matches the simulation requirements, so that the accurate spray simulation effect of the flat wire winding end can be obtained in a short time. In addition, independent simulation of the fluid area of ​​the flat wire winding end helps to accurately simulate the thermal management performance of the area. Through independent simulation analysis, the temperature distribution and fluid circulation efficiency of the end winding can be located in a short time, and efficient heat dissipation design can be achieved, thereby improving the power density of the flat wire motor and the stability and uniformity of the cooling performance; the geometric features of the end fluid domain are modeled in detail, so that the CFD simulation can accurately reflect the actual fluid flow process. This can not only simulate the key parameters such as flow rate, direction, eddy current and cooling oil distribution in the actual spray cooling process, but also effectively evaluate the design performance of the spray strategy and winding structure; by identifying the symmetric features of the fluid domain, the simulation model can be reasonably simplified to reduce the computational complexity, thereby reducing the simulation time and cost. On the basis of ensuring accuracy, the simulation results can be quickly provided to provide effective data support for optimizing the flat wire winding spray design scheme; the symmetric feature simplification method can achieve high-precision and fast output of simulation results, based on which the end winding spray cooling strategy can be optimized and improved according to the simulation results; for example, end spray cooling can make the temperature distribution more uniform by optimizing the spray direction of the cooling oil and the winding structure, eliminating the internal heat island of the winding and improving the heat dissipation efficiency.

[0123] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0124] Based on the same inventive concept, the embodiment of the present application also provides an electric drive system winding end spray simulation device for implementing the electric drive system winding end spray simulation method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations of one or more electric drive system winding end spray simulation device embodiments provided below can refer to the limitations of the electric drive system winding end spray simulation method above, and will not be repeated here.

[0125] In an exemplary embodiment, Fig.16 As shown, a simulation device 100 for spraying the winding end of an electric drive system is provided, comprising: an extraction module 120, a discretization module 140 and a simulation module 160, wherein:

[0126] An extraction module 120, used for importing the three-dimensional model of the winding end into the simulation system, and performing Boolean extraction on the three-dimensional model of the winding end using a preset boundary domain model;

[0127] A discretization module 140 is used to discretize the extracted three-dimensional model to obtain a discretized three-dimensional model;

[0128] The simulation module 160 is used to perform spray simulation on the discretized three-dimensional model using a simulation model that matches the simulation requirements to obtain a spray simulation result.

[0129] The above-mentioned electric drive system winding end spray simulation device uses a preset boundary domain model to perform Boolean extraction on the three-dimensional model of the winding end imported into the simulation system. The extracted three-dimensional model is the three-dimensional model corresponding to the fluid area of ​​the flat wire winding end, which realizes the separate simulation of the fluid area of ​​the flat wire winding end, which is conducive to accurately simulating the thermal management function of the fluid area; the extracted three-dimensional model is discretized, and then a simulation model matching the simulation requirements is used to perform spray simulation on the discretized three-dimensional model, so that an accurate spray simulation effect of the flat wire winding end can be obtained in a relatively short time.

[0130] In one embodiment, a preset boundary domain model is used to perform Boolean extraction on the three-dimensional model of the winding end, and the extraction module 120 is also used to: check the three-dimensional model of the winding end for geometric problems; if there are geometric problems, repair the geometric problems to obtain a repaired three-dimensional model; and use the preset boundary domain model to perform Boolean extraction on the repaired three-dimensional model.

[0131] In one embodiment, a preset boundary domain model is used to perform Boolean extraction on the three-dimensional model of the winding end, and the extraction module 120 is also used to: symmetrically process the asymmetric part of the three-dimensional model of the winding end along the axis of the three-dimensional model of the winding end to obtain a simplified three-dimensional model; and use the preset boundary domain model to perform Boolean extraction on the simplified three-dimensional model.

[0132] In one embodiment, a simulation model that matches the simulation requirements is used to perform spray simulation on the discretized three-dimensional model to obtain a spray simulation result. The simulation module 160 is also used to: determine a numerical calculation algorithm according to the simulation requirements; use a numerical calculation algorithm to obtain the distribution of convective heat transfer coefficient according to the discretized three-dimensional model and initial spray data; the initial spray data includes at least one of an initial inlet velocity, an initial outlet pressure, and an initial wall temperature; and determine the spray simulation result based on the distribution of convective heat transfer coefficient.

[0133] In one embodiment, the spray simulation result is determined based on the distribution of the convective heat transfer coefficient. The simulation module 160 is also used to: during the spray simulation process, adjust the inlet angle of the discretized three-dimensional model, and calculate the distribution of the convective heat transfer coefficient at each inlet angle; determine the spray simulation result based on the distribution of the convective heat transfer coefficient at multiple inlet angles; the spray simulation result is used to determine the spray angle.

[0134] In one embodiment, the spray simulation result is determined based on the distribution of the convective heat transfer coefficient, and the simulation module 160 is also used to: adjust the spray data during the spray simulation process, and calculate the distribution of the convective heat transfer coefficient corresponding to each adjusted spray data; the spray data includes at least one of the inlet velocity, the outlet pressure and the wall temperature; determine the spray simulation result based on the distribution of the convective heat transfer coefficient corresponding to multiple adjusted spray data; the spray simulation result is used to determine the target spray data.

[0135] Each module in the above-mentioned electric drive system winding end spray simulation device can be fully or partially implemented by software, hardware and their combination. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of the above modules.

[0136] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Fig.17 As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, near field communication (NFC) or other technologies. When the computer program is executed by the processor, a method for simulating the spraying of the winding end of an electric drive system is realized. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0137] Those skilled in the art will understand that Fig.17 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0138] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0139] The three-dimensional model of the winding end is imported into the simulation system, and the preset boundary domain model is used to perform Boolean extraction on the three-dimensional model of the winding end; the extracted three-dimensional model is discretized to obtain a discretized three-dimensional model; a simulation model matching the simulation requirements is used to perform spray simulation on the discretized three-dimensional model to obtain a spray simulation result.

[0140] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0141] The three-dimensional model of the winding end is checked for geometric problems; if there are geometric problems, the geometric problems are repaired to obtain a repaired three-dimensional model; and a preset boundary domain model is used to perform Boolean extraction on the repaired three-dimensional model.

[0142] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0143] Along the axis of the three-dimensional model of the winding end, the asymmetric part of the three-dimensional model of the winding end is symmetrically processed to obtain a simplified three-dimensional model; and a preset boundary domain model is used to perform Boolean extraction on the simplified three-dimensional model.

[0144] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0145] Determine the numerical calculation algorithm according to the simulation requirements; use the numerical calculation algorithm to obtain the distribution of convective heat transfer coefficient based on the discretized three-dimensional model and the initial spray data; the initial spray data includes at least one of the initial inlet velocity, the initial outlet pressure and the initial wall temperature; determine the spray simulation result based on the distribution of the convective heat transfer coefficient.

[0146] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0147] During the spray simulation process, the inlet angle of the discretized three-dimensional model is adjusted, and the distribution of the convective heat transfer coefficient at each inlet angle is calculated; the spray simulation results are determined based on the distribution of the convective heat transfer coefficient at multiple inlet angles; the spray simulation results are used to determine the spray angle.

[0148] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0149] During the spray simulation process, the spray data is adjusted, and the distribution of the convective heat transfer coefficient corresponding to each adjusted spray data is calculated; the spray data includes at least one of the inlet velocity, the outlet pressure and the wall temperature; the spray simulation result is determined based on the distribution of the convective heat transfer coefficient corresponding to the multiple adjusted spray data; the spray simulation result is used to determine the target spray data.

[0150] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0151] The three-dimensional model of the winding end is imported into the simulation system, and the preset boundary domain model is used to perform Boolean extraction on the three-dimensional model of the winding end; the extracted three-dimensional model is discretized to obtain a discretized three-dimensional model; a simulation model matching the simulation requirements is used to perform spray simulation on the discretized three-dimensional model to obtain a spray simulation result.

[0152] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0153] The three-dimensional model of the winding end is checked for geometric problems; if there are geometric problems, the geometric problems are repaired to obtain a repaired three-dimensional model; and a preset boundary domain model is used to perform Boolean extraction on the repaired three-dimensional model.

[0154] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0155] Along the axis of the three-dimensional model of the winding end, the asymmetric part of the three-dimensional model of the winding end is symmetrically processed to obtain a simplified three-dimensional model; and a preset boundary domain model is used to perform Boolean extraction on the simplified three-dimensional model.

[0156] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0157] Determine the numerical calculation algorithm according to the simulation requirements; use the numerical calculation algorithm to obtain the distribution of convective heat transfer coefficient based on the discretized three-dimensional model and the initial spray data; the initial spray data includes at least one of the initial inlet velocity, the initial outlet pressure and the initial wall temperature; determine the spray simulation result based on the distribution of the convective heat transfer coefficient.

[0158] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0159] During the spray simulation process, the inlet angle of the discretized three-dimensional model is adjusted, and the distribution of the convective heat transfer coefficient at each inlet angle is calculated; the spray simulation results are determined based on the distribution of the convective heat transfer coefficient at multiple inlet angles; the spray simulation results are used to determine the spray angle.

[0160] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0161] During the spray simulation process, the spray data is adjusted, and the distribution of the convective heat transfer coefficient corresponding to each adjusted spray data is calculated; the spray data includes at least one of the inlet velocity, the outlet pressure and the wall temperature; the spray simulation result is determined based on the distribution of the convective heat transfer coefficient corresponding to the multiple adjusted spray data; the spray simulation result is used to determine the target spray data.

[0162] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0163] The three-dimensional model of the winding end is imported into the simulation system, and the preset boundary domain model is used to perform Boolean extraction on the three-dimensional model of the winding end; the extracted three-dimensional model is discretized to obtain a discretized three-dimensional model; a simulation model matching the simulation requirements is used to perform spray simulation on the discretized three-dimensional model to obtain a spray simulation result.

[0164] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0165] The three-dimensional model of the winding end is checked for geometric problems; if there are geometric problems, the geometric problems are repaired to obtain a repaired three-dimensional model; and a preset boundary domain model is used to perform Boolean extraction on the repaired three-dimensional model.

[0166] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0167] Along the axis of the three-dimensional model of the winding end, the asymmetric part of the three-dimensional model of the winding end is symmetrically processed to obtain a simplified three-dimensional model; and a preset boundary domain model is used to perform Boolean extraction on the simplified three-dimensional model.

[0168] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0169] Determine the numerical calculation algorithm according to the simulation requirements; use the numerical calculation algorithm to obtain the distribution of convective heat transfer coefficient based on the discretized three-dimensional model and the initial spray data; the initial spray data includes at least one of the initial inlet velocity, the initial outlet pressure and the initial wall temperature; determine the spray simulation result based on the distribution of the convective heat transfer coefficient.

[0170] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0171] During the spray simulation process, the inlet angle of the discretized three-dimensional model is adjusted, and the distribution of the convective heat transfer coefficient at each inlet angle is calculated; the spray simulation results are determined based on the distribution of the convective heat transfer coefficient at multiple inlet angles; the spray simulation results are used to determine the spray angle.

[0172] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0173] During the spray simulation process, the spray data is adjusted, and the distribution of the convective heat transfer coefficient corresponding to each adjusted spray data is calculated; the spray data includes at least one of the inlet velocity, the outlet pressure and the wall temperature; the spray simulation result is determined based on the distribution of the convective heat transfer coefficient corresponding to the multiple adjusted spray data; the spray simulation result is used to determine the target spray data.

[0174] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0175] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0176] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0177] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for simulating the spraying of winding ends of an electric drive system, characterized in that: The method comprises: Importing the three-dimensional model of the winding end into the simulation system, and performing Boolean extraction on the three-dimensional model of the winding end using a preset boundary domain model; Discretizing the extracted three-dimensional model to obtain a discretized three-dimensional model; A simulation model matching the simulation requirements is used to perform spray simulation on the discretized three-dimensional model to obtain a spray simulation result.

2. The method according to claim 1, characterized in that The method of using a preset boundary domain model to perform Boolean extraction on the three-dimensional model of the winding end includes: Checking the three-dimensional model of the winding end for geometric problems; If there is a geometric problem, repair the geometric problem to obtain a repaired three-dimensional model; A preset boundary domain model is used to perform Boolean extraction on the repaired three-dimensional model.

3. The method according to claim 1, characterized in that The method of using a preset boundary domain model to perform Boolean extraction on the three-dimensional model of the winding end includes: Along the axis of the three-dimensional model of the winding end, symmetric processing is performed on the asymmetric part of the three-dimensional model of the winding end to obtain a simplified three-dimensional model; A preset boundary domain model is used to perform Boolean extraction on the simplified three-dimensional model.

4. The method according to claim 1, characterized in that: The method of using a simulation model matching the simulation requirements to perform spray simulation on the discretized three-dimensional model to obtain a spray simulation result includes: Determine the numerical calculation algorithm according to simulation requirements; According to the discretized three-dimensional model and the initial spray data, the distribution of the convective heat transfer coefficient is obtained by using the numerical calculation algorithm; the initial spray data includes at least one of the initial inlet velocity, the initial outlet pressure and the initial wall temperature; Based on the convective heat transfer coefficient distribution, the spray simulation result is determined.

5. The method according to claim 4, characterized in that The step of determining the spray simulation result based on the convective heat transfer coefficient distribution includes: During the spray simulation process, the inlet angle of the discretized three-dimensional model is adjusted, and the distribution of the convective heat transfer coefficient at each inlet angle is calculated; The spray simulation result is determined based on the distribution of convective heat transfer coefficients at multiple inlet angles; the spray simulation result is used to determine the spray angle.

6. The method according to claim 4, characterized in that The step of determining the spray simulation result based on the convective heat transfer coefficient distribution includes: During the spray simulation process, the spray data is adjusted, and the distribution of the convective heat transfer coefficient corresponding to each adjusted spray data is calculated; the spray data includes at least one of the inlet velocity, the outlet pressure and the wall temperature; The spray simulation result is determined based on the distribution of convective heat transfer coefficients corresponding to the multiple adjusted spray data; the spray simulation result is used to determine the target spray data.

7. A winding end spray simulation device for an electric drive system, characterized in that: The device comprises: An extraction module, used for importing the three-dimensional model of the winding end into the simulation system, and performing Boolean extraction on the three-dimensional model of the winding end using a preset boundary domain model; A discretization module is used to discretize the extracted three-dimensional model to obtain a discretized three-dimensional model; The simulation module is used to perform spray simulation on the discretized three-dimensional model using a simulation model that matches the simulation requirements to obtain a spray simulation result.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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