CN114117675B - Numerical simulation method and system for temperature and humidity field of operating mechanism - Google Patents
Numerical simulation method and system for temperature and humidity field of operating mechanism Download PDFInfo
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Abstract
The invention discloses a temperature and humidity field numerical simulation method and a temperature and humidity field numerical simulation system for an operating mechanism. The simulation method can obtain the running condition in the box body of the typical operating mechanism quickly and provide visual display, and provides verification for the rationality of the design of the operating mechanism. Based on the simulation method, further numerical simulation is performed by changing the size and the power of the heater, so that the influence rule of the size and the power of the heater on the running condition in the operating mechanism box body is obtained, and technical reference is provided for the selection and the design of the parameters of the heater of the operating mechanism.
Description
Technical Field
The invention relates to the field of thermal simulation of an operating mechanism of high-voltage electrical control equipment, in particular to a temperature and humidity field numerical simulation method and a temperature and humidity field numerical simulation system of the operating mechanism.
Background
The operating mechanism is widely applied to electric control equipment such as a high-voltage circuit breaker, a high-voltage load switch, a high-voltage isolating switch and the like, and the reliability of the operating mechanism is directly related to the safe and stable operation of a power grid.
Ambient temperature is one of the key factors affecting the reliability of the operating mechanism. When the ambient temperature is extremely low, the output characteristics of the operating mechanism can be greatly changed, so that the opening and closing time, speed and the like of the high-voltage circuit breaker, the switch and the like are affected. The region of China is wide, the climate difference is huge, the winter environment temperature in the northern severe cold region can be reduced to below-40 ℃, the influence of the temperature on an operating mechanism is more remarkable, and the higher requirements on the safe and stable operation of a power grid are provided.
At present, design researches on an operating mechanism are mainly focused on voltage characteristics, switching-on and switching-off characteristics, switching-off current, reliability analysis and the like, and researches on temperature simulation of the operating mechanism are relatively few, and a simulation method combining temperature and humidity of the operating mechanism is quite fresh, and particularly a rapid and accurate simulation method aiming at temperature and humidity of the operating mechanism needs to be further developed. Therefore, establishing a rapid and reliable numerical simulation method for simulating the air temperature distribution and the humidity distribution in a typical operating mechanism box body is a key in the design of the operating mechanism. In addition, the optimal parameters of the heater of the typical operating mechanism are efficiently and accurately determined through numerical simulation, and the method has important significance in improving the running stability of the electric control equipment and even the power grid.
Disclosure of Invention
The invention aims to overcome the defects of the existing method and provides a temperature and humidity field numerical simulation method and system for an operating mechanism. The invention improves the design efficiency and accuracy of the heater of the operating mechanism, and has important significance for improving the running stability of the electric control equipment and even the power grid.
In order to achieve the above object, the present invention provides the following technical solutions.
A temperature and humidity field numerical simulation method of an operating mechanism comprises the following steps:
s1: simplifying a geometric model of the operating mechanism according to the structural characteristics of a typical operating mechanism, establishing a simplified geometric model comprising air, ambient air and solid parts in a box body of the operating mechanism, naming key structural parameters, and recording macro files of automatic parametric modeling;
s2: performing unstructured grid division on the fluid domain outside the operating mechanism box body, the fluid domain in the operating mechanism box body and the solid domain on the simplified geometric model to obtain a grid model, and recording macro files of automatic grid division;
s3: performing numerical simulation calculation on the grid model, establishing corresponding external fluid domains, internal fluid domains and solid domains, setting interfaces of all calculation domains as coupling surfaces, setting corresponding boundary conditions of all calculation domains, correcting the air and steam material properties calculated by numerical simulation according to physical property parameters of real wet air, solving and setting, generating a simulation definition file, and deriving an automatic preprocessing command stream file;
s4: based on the simulation definition file, carrying out numerical simulation on a temperature field and a humidity field in the operating mechanism box body;
s5: performing simulation result processing, self-defining a relative humidity calculation formula, solving the minimum temperature and the maximum humidity in the box body of the operating mechanism and the maximum temperature of the surface of the heater, and leading out a command stream file for automatic post-processing;
s6: and (3) sorting the recorded macro files and command stream files of automatic modeling, grid division, preprocessing and post-processing, writing the command line files of the automatic modeling, grid division, preprocessing and post-processing, and carrying out quick simulation of the temperature and humidity field in the operating mechanism box body.
As a further improvement of the invention, in the step S1, when simplifying the geometric model of the operating mechanism, the parts with smaller size than the mechanism are removed, and all the rounding angles are simplified into right angles;
and carrying out parametric modeling by adopting UG software, naming each key structure parameter of the operation structure in the expression option of the UG software tool menu, exporting an expression file in an exp format, and recording the first parametric modeling process into a macro file in an exp/vb format.
In the step S2, the whole area of each simplified geometric model is imported into a Workbench' S Meshing module for unstructured grid division, so as to further refine grids of curved surfaces and edge areas;
determining the minimum grid size according to 1/5 of the minimum structure size of each region in the operating mechanism box body, wherein the maximum grid size is 1/100 of the maximum size of each region, the grid growth ratio is 1.2, the boundary layer grid is added for the internal fluid grid, and the first layer grid is determined according to the y+ value; exporting the completed grid model into a grid model in the format of cgns; and recording the first grid division process, and generating and exporting an automatic grid division script file in an rpl format.
As a further improvement of the invention, in the step S3, the grid model is led into the CFX pretreatment module to establish a new wet air mixing material; the ideal air material in CFX is modified according to the physical parameters of the actual air, and the specific steps are as follows:
the aerodynamic viscosity calculation formula is:
the air heat conductivity calculation formula is:
air constant pressure specific heat capacity calculation formula:
c p ＝0.2348T+936.95
wherein: mu (mu) 0 Is the dynamic viscosity of the gas at 0 ℃, T 0 Lambda is the reference temperature 0 The thermal conductivity of the gas at 0℃and S the Sutherland constant.
As a further improvement of the present invention, the S3 specifically includes:
introducing a grid model of an inner fluid domain, a solid domain and an outer fluid domain into the CFX pretreatment module, establishing corresponding inner fluid domain, solid domain and outer fluid domain, wherein the inner fluid domain and the outer fluid domain select newly-built wet air and give corresponding air/steam components;
establishing an interface between the inner fluid domain and the solid domain and an interface between the solid domain and the outer fluid domain, wherein the two interfaces are fluid-solid interfaces, and the interfaces are arranged to have continuous temperature and heat flux;
establishing a flow-to-flow interface between the inner and outer fluid domains, the interface being configured to have the same temperature and flow rate; setting four sides and top surfaces of the outer fluid zone as open conditions, given ambient temperature, pressure and humidity; setting a subdomain in a solid domain of the heater and giving the heat flux density of the fluid;
initializing the temperature, pressure and humidity of the inner and outer fluid domains; setting a solving step number and a convergence criterion; and generating a simulation definition file and finally exporting an automation preprocessing command stream file in the ccl format.
As a further improvement of the present invention, the S4 specifically includes:
opening a simulation definition file, and carrying out numerical simulation of a temperature field and a humidity field in the operating mechanism box body in the CFX solving module; and setting parallel operation solution, and designating the existing calculation result as an initial iteration file.
As a further improvement of the present invention, the S5 specifically includes:
simulation result processing is carried out in the CFX post-processing module, a calculation formula of absolute humidity SH and relative humidity RH is customized, and absolute humidity SH=0.0025e 0.0817T Relative humidity rh=100×m s /SH，m s For steam quality in numerical result filesA quantitative fraction; and solving the lowest temperature, the maximum humidity and the highest temperature of the surface of the heater in the box body of the operating mechanism through the self-contained function of the CFX post-processing module, and deriving a command stream file of the automatic post-processing in cst format.
An operating mechanism temperature and humidity field numerical simulation system, comprising:
the model simplifying module is used for simplifying the geometric model of the operating mechanism according to the structural characteristics of a typical operating mechanism, establishing a simplified geometric model containing air, ambient air and solid parts in a box body of the operating mechanism, naming each key structural parameter, and recording a macro file of automatic parametric modeling;
the grid division module is used for carrying out unstructured grid division on the fluid domain outside the operating mechanism box body, the fluid domain in the operating mechanism box body and the solid domain on the simplified geometric model to obtain a grid model, and recording a macro file of automatic grid division;
the numerical simulation module is used for carrying out numerical simulation calculation on the grid model, establishing corresponding external fluid domains, internal fluid domains and solid domains, setting interfaces of all calculation domains as coupling surfaces, setting corresponding boundary conditions of all calculation domains, correcting the air and steam material properties of the numerical simulation calculation according to the physical property parameters of the real wet air, carrying out solving and setting, generating a simulation definition file, and deriving an instruction stream file for automatic pretreatment; based on the simulation definition file, carrying out numerical simulation on a temperature field and a humidity field in the operating mechanism box body; performing simulation result processing, self-defining a relative humidity calculation formula, solving the minimum temperature and the maximum humidity in the box body of the operating mechanism and the maximum temperature of the surface of the heater, and leading out a command stream file for automatic post-processing;
and the rapid simulation module is used for sorting recorded macro files and command stream files of automatic modeling, grid division, preprocessing and post-processing, writing command line files of the automatic modeling, grid division, preprocessing and post-processing, and performing rapid simulation on a temperature and humidity field in the operating mechanism box body.
An electronic device comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the steps of the temperature and humidity field numerical simulation method of the operating mechanism when executing the computer program.
A computer readable storage medium storing a computer program which when executed by a processor implements the steps of the operating mechanism thermal field numerical simulation method.
Compared with the prior art, the invention has the following beneficial effects:
the method establishes a quick and reliable numerical simulation method for simulating the temperature distribution and the humidity distribution of the air in the box body of the typical operating mechanism, and the rationality of the design of the heating system of the operating mechanism can be rapidly verified through numerical simulation; the model of the typical operating mechanism is reasonably simplified, so that the accuracy of numerical simulation can be ensured, and the efficiency of geometric modeling and numerical simulation can be improved; the external fluid domain, the solid domain and the internal fluid domain of the operating mechanism box body are subjected to grid division simultaneously, so that the complete matching of grids at all interfaces is ensured, and the accuracy of a numerical simulation result is further ensured; the air and steam material properties in CFX software are corrected according to the physical parameters of the real wet air, so that the accuracy of the numerical simulation result is further ensured; the automatic modeling, automatic grid division and numerical simulation of the heater of the typical operating mechanism are realized, and the efficiency of the thermal humidity simulation of the typical operating mechanism is greatly improved. The numerical simulation method can efficiently and accurately determine the optimal parameters of the heater of the typical operating mechanism, and has important significance for improving the operation stability of the electrical control equipment and even the power grid.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. In the drawings:
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a diagram of an original model and a simplified geometric model of a certain CT20-IV spring mechanism;
FIG. 3 shows the flow field in the case of a certain CT20-IV spring mechanism operator;
FIG. 4 is a grid independence verification of a certain CT20-IV spring mechanism;
FIG. 5 is a grid model of a certain CT20-IV spring mechanism;
FIG. 6 shows the temperature field within a housing of a CT20-IV spring mechanism operating mechanism;
FIG. 7 shows the humidity field within a certain CT20-IV spring mechanism operator housing;
FIG. 8 is an experimental verification model;
FIG. 9 is a graph showing experimental verification results;
FIG. 10 is a schematic diagram of a temperature and humidity field numerical simulation system of an operating mechanism according to a preferred embodiment of the present invention;
fig. 11 is a schematic structural view of an electronic device according to a preferred embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The invention discloses a temperature and humidity field numerical simulation method of an operating mechanism, which is characterized in that a gas-heat-humidity multi-field coupling simulation model of the typical operating mechanism is established in CFX according to working condition characteristics and structural characteristics of the typical operating mechanism, and the model comprises an external fluid domain, an internal fluid domain and a solid domain of a box body of the operating mechanism. According to the actual operation condition of the operating mechanism, the temperature field and humidity field distribution in the box body of the typical operating mechanism under different environment temperatures and humidity conditions are obtained through simulation, and the lowest temperature and the maximum humidity in the box body and the highest temperature of the surface of the heater are obtained through post-treatment. The method specifically comprises the following steps:
s1: simplifying a geometric model of the operating mechanism according to the structural characteristics of a typical operating mechanism, establishing a simplified geometric model comprising air, ambient air and solid parts in a box body of the operating mechanism, naming key structural parameters, and recording macro files of automatic parametric modeling;
s2: performing unstructured grid division on the fluid domain outside the operating mechanism box body, the fluid domain in the operating mechanism box body and the solid domain on the simplified geometric model to obtain a grid model, and recording macro files of automatic grid division;
s3: performing numerical simulation calculation on the grid model, establishing corresponding external fluid domains, internal fluid domains and solid domains, setting interfaces of all calculation domains as coupling surfaces, setting corresponding boundary conditions of all calculation domains, correcting the air and steam material properties calculated by numerical simulation according to physical property parameters of real wet air, solving and setting, generating a simulation definition file, and deriving an automatic preprocessing command stream file;
s4: based on the simulation definition file, carrying out numerical simulation on a temperature field and a humidity field in the operating mechanism box body;
s5: performing simulation result processing, self-defining a relative humidity calculation formula, solving the minimum temperature and the maximum humidity in the box body of the operating mechanism and the maximum temperature of the surface of the heater, and leading out a command stream file for automatic post-processing;
s6: and (3) sorting the recorded macro files and command stream files of automatic modeling, grid division, preprocessing and post-processing, writing the command line files of the automatic modeling, grid division, preprocessing and post-processing, and carrying out quick simulation of the temperature and humidity field in the operating mechanism box body.
The simulation method can obtain the running condition in the box body of the typical operating mechanism quickly and provide visual display, and provides verification for the rationality of the design of the operating mechanism. Based on the simulation method, further numerical simulation is performed by changing the size and the power of the heater, so that the influence rule of the size and the power of the heater on the running condition in the operating mechanism box body is obtained, and technical reference is provided for the selection and the design of the parameters of the heater of the operating mechanism. The invention improves the design efficiency and accuracy of the heater of the operating mechanism, and has important significance for improving the running stability of the electric control equipment and even the power grid.
The present invention will be described in detail with reference to specific embodiments and drawings.
As shown in fig. 1, the temperature and humidity field numerical simulation method of the operating mechanism of the invention comprises the following steps:
s1: according to the structural characteristics of a typical operating mechanism, UG software is adopted to simplify a geometric model, a simplified geometric model comprising air, ambient air and solid parts in a box body of the operating mechanism is established, key structural parameters are named, and macro files of automatic parametric modeling are recorded.
The method comprises the following specific steps:
a certain CT20-IV type spring mechanism is taken as a research object, the model is reasonably simplified, and parameterized modeling is carried out. FIG. 2 is a schematic diagram of a CT20-IV spring mechanism, which mainly comprises spring mechanism, heater, and operating mechanism box, the length, width and height dimensions of the operating mechanism box are 784×790×1225, and the unit is mm. The simplified part mainly comprises: removing small parts such as hinges, locks, supports, bolts and nuts, small round holes and parts with small volume; simplifying all the rounding corners into right angles; simplifying the two operation mechanism boxes into operation mechanism boxes with smooth wall surfaces; simplifying the heater and the two array structures into a cuboid; the ventilation opening is correspondingly simplified; the temperature field and the humidity field obtained by simplifying the calculation of the geometric model are still more accurate. Carrying out parametric modeling by adopting UG software, wherein the established model comprises an external environment fluid domain, a solid domain and an internal fluid domain of the operating mechanism; naming each key structural parameter of the operation structure such as the position and the size parameter of the heater in the expression options of the UG software tool menu, deriving an expression file in the format of x.exp, and recording the first parameterization modeling process into a macro file in the format of x.vb.
S2: and (3) integrally importing each region of the simplified geometric model into a Meshing module of ANSYS Workbench to perform unstructured grid division, and simultaneously starting Curve and Proimity methods in an advanced size control option to refine grids of curved surfaces and edge regions. Determining the minimum grid size according to 1/5 of the minimum structure size of each region in the operating mechanism box body, wherein the maximum grid size is 1/100 of the maximum size of each region, the grid growth ratio is 1.2, boundary layer grids are additionally arranged for the internal fluid grids, the number of layers is 15, and the first layer of grids are determined according to the y+ value; the mesh model after division is shown in fig. 3; exporting the completed grid model into a grid model in a cgns format so as to be imported into a CFX preprocessing module for use; and recording the first grid division process, and generating and exporting an automatic grid division script file in an rpl format.
In order to ensure the reliability and economy of the numerical method, the grid independence verification of a certain CT20-IV type spring mechanism is carried out. The numerical calculation of 6 sets of grids is carried out, and the total grid number is 180 ten thousand, 260 ten thousand, 380 ten thousand, 500 ten thousand, 660 ten thousand and 810 ten thousand respectively. Fig. 4 shows the minimum temperature and maximum humidity in the mechanism operator housing as a function of total grid number. It can be seen that the lowest temperature in the mechanism operating mechanism box body gradually decreases along with the increase of the total grid number, the maximum humidity gradually increases along with the increase of the total grid number, and the difference between the lowest temperature and the maximum humidity when the total grid number is 500 ten thousand and 660 ten thousand is very small, the difference is within 3%, which indicates that the requirement of grid independence is met.
S3: first, the CFX pretreatment module is opened, a new wet air mixing material is established, the material is formed by combining an ideal air material carried by CFX and steam of a steam3 model in an IAPWS-IF97 database in a variable component mode, and the mixing mode is ideal mixing. In order to improve the calculation accuracy, the ideal air material in the CFX is modified according to the physical parameters of the actual air, and the method specifically comprises the following steps:
the aerodynamic viscosity calculation formula is:
the air heat conductivity calculation formula is:
air constant pressure specific heat capacity calculation formula:
c p ＝0.2348T+936.95 (3)
wherein: mu (mu) 0 The dynamic viscosity of the gas at 0 ℃ is 1.7894 multiplied by 10 -5 Pa·s，T 0 Is a reference temperature, the value is 273.11K, lambda 0 The thermal conductivity of the gas at 0℃was 0.0261W/(mK), and S was Sutherland constant, which was 110.56.
Then, simultaneously introducing a grid model of an inner fluid domain, a solid domain and an outer fluid domain into the CFX pretreatment module, and establishing corresponding inner fluid domain, solid domain and outer fluid domain, wherein the inner fluid domain and the outer fluid domain respectively select newly-built wet air and give corresponding air/steam components; setting a solving type, a discrete format, a heat transfer solving model, a flow solving model, a turbulence model and the like; establishing an interface between the inner fluid domain and the solid domain and an interface between the solid domain and the outer fluid domain, wherein the two interfaces are fluid-solid interfaces, and the interfaces are arranged to have continuous temperature and heat flux; establishing a flow-to-flow interface between the inner and outer fluid domains, the interface being configured to have the same temperature and flow rate; setting four sides and top surfaces of the outer fluid zone as open conditions, given ambient temperature, pressure and humidity; setting a subdomain in a solid domain of the heater and giving the heat flux density of the fluid; initializing the temperature, pressure and humidity of the inner and outer fluid domains; setting the solving steps and convergence criteria.
Finally, generating a simulation definition file and exporting an automation preprocessing command stream file in the ccl format.
S4: and opening a simulation definition file, and carrying out numerical simulation of a temperature field and a humidity field in the operating mechanism box body in the CFX solving module. Because the grid number of the numerical model of the operating mechanism is large, parallel operation solution is required to be set, the required CPU core number is larger than 8, the memory is larger than 16GB, and the existing calculation result is designated as an initial iteration file so as to accelerate the solving speed of CFX.
S5: simulation result processing is carried out in the CFX post-processing module, a calculation formula of absolute humidity SH and relative humidity RH is customized, and absolute humidity SH=0.0025e 0.0817T Relative humidity rh=100×m s /SH，m s Is the steam mass fraction in the numerical result file. Taking a certain CT20-IV spring mechanism as an example, the thermal humidity simulation of the operating mechanism can be rapidly completed according to the steps of the simulation method; the simulation result of the flow field in the operating mechanism box body is shown in fig. 5, the simulation result of the temperature field is shown in fig. 6, and the simulation result of the humidity field is shown in fig. 7. And solving the lowest temperature, the maximum humidity and the highest temperature of the surface of the heater in the box body of the operating mechanism through the self-contained function of the CFX post-processing module, and deriving a command stream file of the automatic post-processing in cst format.
S6: and writing the derived macro file and command stream file of automatic modeling, grid division, preprocessing and post-processing into a CMD command line file in a bart format, changing variable values in input parameter files of each step and running corresponding CMD files, so as to realize the rapid simulation of a temperature and humidity field in an operating mechanism box body.
The simulation method verifies that:
in order to verify the correctness of the simulation method, the experiment of Sevilgen et al is simulated and calculated, and the experimental results are compared. The experimental model of Sevilgen et al is shown in fig. 8. The model dimensions are length x width x height = 4 x 3m 3 The method comprises the steps of carrying out a first treatment on the surface of the Glazing length x height = 1.8 x 1.3m 2 Thickness is 0.005m; double panel heat sink dimensions are long x high = 1.5 x 0.6m 2 Thickness is 0.1m; the inlet and outlet dimensions were both long x high = 1 x 0.15m 2 The method comprises the steps of carrying out a first treatment on the surface of the The height of the seated human body is calculated as 1.3 m. At the center line of the z= -2m section, 8 monitoring points are sequentially set up upwards with the head of the human body as a starting point, and the distance from the head is sequentially as follows: 0.025m,0.05m,0.1m,0.2m,0.3m,0.4m,0.6m,0.8m; the corresponding coordinates are in turn: (2,1.325, -2), (2,1.35, -2), (2,1.4, -2), (2,1.5, -2), (2,1.6, -2), (2,1.7, -2), (2,1.9, -2), (2,2.1, -2).
In the CFX setting, a turbulence model adopts an RNG k-epsilon model, steam and air are selected as components in a component transportation model, and boundary conditions are set: the speed inlet is 0.15m/s, and the mass fraction of the water vapor in the components is 0.0095 according to the specific humidity of 9.5 g/kg; the pressure outlet is in an atmospheric pressure environment, and the water vapor content of the components is set to be 0; the inlet and outlet turbulences were set to 10%; the surface of the radiator is set to be at a fixed temperature of 60 ℃; the surface of the human body is set to be at a fixed temperature of 33 ℃, and the mass fraction of the water vapor in the components is set to be 0.01 according to the specific humidity of 10 g/kg; the glass outer window is provided with convection boundary conditions, and performs convection heat exchange with an external environment at 0 ℃ with a convection heat exchange coefficient of 25W/(m) 2 K) The method comprises the steps of carrying out a first treatment on the surface of the The other surfaces are provided as heat-insulating walls, the surfaces for which the water vapor content is mentioned are all set at a default setting of 0 flux. The calculation adopts SIMPLE algorithm, the pressure, speed, energy and steam transmission equation adopts second order windward format, and the iterative calculation of all equations is converged to 10 -5 。
The comparison of the calculation results of the simulation method of the present invention with the experimental results of Sevilgen et al is shown in fig. 9. It can be seen that the temperature and humidity calculated by the method are similar to the temperature and humidity data measured by experiments, and the maximum error is 4.4% and 8.5% respectively. Therefore, the temperature and humidity field numerical simulation method for the operating mechanism has higher reliability and accuracy, can be used for simulation calculation of the heat and humidity of the operating mechanism, and provides technical support and verification for the heat design of the heating system of the operating mechanism. The method has important significance for improving the operation mechanism of the electrical control equipment and even the running stability of the power grid.
As shown in fig. 10, another objective of the present invention is to provide a temperature and humidity field numerical simulation system of an operating mechanism, which includes:
the model simplifying module is used for simplifying the geometric model of the operating mechanism according to the structural characteristics of a typical operating mechanism, establishing a simplified geometric model containing air, ambient air and solid parts in a box body of the operating mechanism, naming each key structural parameter, and recording a macro file of automatic parametric modeling;
the grid division module is used for carrying out unstructured grid division on the fluid domain outside the operating mechanism box body, the fluid domain in the operating mechanism box body and the solid domain on the simplified geometric model to obtain a grid model, and recording a macro file of automatic grid division;
the numerical simulation module is used for carrying out numerical simulation calculation on the grid model, establishing corresponding external fluid domains, internal fluid domains and solid domains, setting interfaces of all calculation domains as coupling surfaces, setting corresponding boundary conditions of all calculation domains, correcting the air and steam material properties of the numerical simulation calculation according to the physical property parameters of the real wet air, carrying out solving and setting, generating a simulation definition file, and deriving an instruction stream file for automatic pretreatment; based on the simulation definition file, carrying out numerical simulation on a temperature field and a humidity field in the operating mechanism box body; performing simulation result processing, self-defining a relative humidity calculation formula, solving the minimum temperature and the maximum humidity in the box body of the operating mechanism and the maximum temperature of the surface of the heater, and leading out a command stream file for automatic post-processing;
and the rapid simulation module is used for sorting recorded macro files and command stream files of automatic modeling, grid division, preprocessing and post-processing, writing command line files of the automatic modeling, grid division, preprocessing and post-processing, and performing rapid simulation on a temperature and humidity field in the operating mechanism box body.
As shown in fig. 11, a third object of the present invention is to provide an electronic device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein the processor implements the steps of the temperature and humidity field numerical simulation method of the operating mechanism when executing the computer program.
The temperature and humidity field numerical simulation method of the operating mechanism comprises the following steps:
s1: simplifying a geometric model of the operating mechanism according to the structural characteristics of a typical operating mechanism, establishing a simplified geometric model comprising air, ambient air and solid parts in a box body of the operating mechanism, naming key structural parameters, and recording macro files of automatic parametric modeling;
s2: performing unstructured grid division on the fluid domain outside the operating mechanism box body, the fluid domain in the operating mechanism box body and the solid domain on the simplified geometric model to obtain a grid model, and recording macro files of automatic grid division;
s3: performing numerical simulation calculation on the grid model, establishing corresponding external fluid domains, internal fluid domains and solid domains, setting interfaces of all calculation domains as coupling surfaces, setting corresponding boundary conditions of all calculation domains, correcting the air and steam material properties calculated by numerical simulation according to physical property parameters of real wet air, solving and setting, generating a simulation definition file, and deriving an automatic preprocessing command stream file;
s4: based on the simulation definition file, carrying out numerical simulation on a temperature field and a humidity field in the operating mechanism box body;
s5: performing simulation result processing, self-defining a relative humidity calculation formula, solving the minimum temperature and the maximum humidity in the box body of the operating mechanism and the maximum temperature of the surface of the heater, and leading out a command stream file for automatic post-processing;
s6: and (3) sorting the recorded macro files and command stream files of automatic modeling, grid division, preprocessing and post-processing, writing the command line files of the automatic modeling, grid division, preprocessing and post-processing, and carrying out quick simulation of the temperature and humidity field in the operating mechanism box body.
A fourth object of the present invention is to provide a computer readable storage medium storing a computer program, which when executed by a processor, implements the steps of the operating mechanism thermal field numerical simulation method.
The temperature and humidity field numerical simulation method of the operating mechanism comprises the following steps:
s1: simplifying a geometric model of the operating mechanism according to the structural characteristics of a typical operating mechanism, establishing a simplified geometric model comprising air, ambient air and solid parts in a box body of the operating mechanism, naming key structural parameters, and recording macro files of automatic parametric modeling;
s2: performing unstructured grid division on the fluid domain outside the operating mechanism box body, the fluid domain in the operating mechanism box body and the solid domain on the simplified geometric model to obtain a grid model, and recording macro files of automatic grid division;
s3: performing numerical simulation calculation on the grid model, establishing corresponding external fluid domains, internal fluid domains and solid domains, setting interfaces of all calculation domains as coupling surfaces, setting corresponding boundary conditions of all calculation domains, correcting the air and steam material properties calculated by numerical simulation according to physical property parameters of real wet air, solving and setting, generating a simulation definition file, and deriving an automatic preprocessing command stream file;
s4: based on the simulation definition file, carrying out numerical simulation on a temperature field and a humidity field in the operating mechanism box body;
s5: performing simulation result processing, self-defining a relative humidity calculation formula, solving the minimum temperature and the maximum humidity in the box body of the operating mechanism and the maximum temperature of the surface of the heater, and leading out a command stream file for automatic post-processing;
s6: and (3) sorting the recorded macro files and command stream files of automatic modeling, grid division, preprocessing and post-processing, writing the command line files of the automatic modeling, grid division, preprocessing and post-processing, and carrying out quick simulation of the temperature and humidity field in the operating mechanism box body.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (9)
1. The temperature and humidity field numerical simulation method for the operating mechanism is characterized by comprising the following steps of:
s1: simplifying a geometric model of the operating mechanism according to the structural characteristics of a typical operating mechanism, establishing a simplified geometric model comprising air, ambient air and solid parts in a box body of the operating mechanism, naming key structural parameters, and recording macro files of automatic parametric modeling;
s2: performing unstructured grid division on the fluid domain outside the operating mechanism box body, the fluid domain in the operating mechanism box body and the solid domain on the simplified geometric model to obtain a grid model, and recording macro files of automatic grid division;
s3: performing numerical simulation calculation on the grid model, establishing corresponding external fluid domains, internal fluid domains and solid domains, setting interfaces of all calculation domains as coupling surfaces, setting corresponding boundary conditions of all calculation domains, correcting the air and steam material properties calculated by numerical simulation according to physical property parameters of real wet air, solving and setting, generating a simulation definition file, and deriving an automatic preprocessing command stream file;
the step S3 specifically comprises the following steps:
introducing a grid model of an inner fluid domain, a solid domain and an outer fluid domain into the CFX pretreatment module, establishing corresponding inner fluid domain, solid domain and outer fluid domain, wherein the inner fluid domain and the outer fluid domain select newly-built wet air and give corresponding air/steam components;
establishing an interface between the inner fluid domain and the solid domain and an interface between the solid domain and the outer fluid domain, wherein the two interfaces are fluid-solid interfaces, and the interfaces are arranged to have continuous temperature and heat flux;
establishing a flow-to-flow interface between the inner and outer fluid domains, the interface being configured to have the same temperature and flow rate; setting four sides and top surfaces of the outer fluid zone as open conditions, given ambient temperature, pressure and humidity; setting a subdomain in a solid domain of the heater and giving the heat flux density of the fluid;
initializing the temperature, pressure and humidity of the inner and outer fluid domains; setting a solving step number and a convergence criterion; generating a simulation definition file and finally exporting an automatic preprocessing command stream file in a ccl format;
s4: based on the simulation definition file, carrying out numerical simulation on a temperature field and a humidity field in the operating mechanism box body;
s5: performing simulation result processing, self-defining a relative humidity calculation formula, solving the minimum temperature and the maximum humidity in the box body of the operating mechanism and the maximum temperature of the surface of the heater, and leading out a command stream file for automatic post-processing;
s6: and (3) sorting the recorded macro files and command stream files of automatic modeling, grid division, preprocessing and post-processing, writing the command line files of the automatic modeling, grid division, preprocessing and post-processing, and carrying out quick simulation of the temperature and humidity field in the operating mechanism box body.
2. The method for simulating the temperature and humidity field numerical value of an operating mechanism according to claim 1, wherein in the step S1, when the geometric model of the operating mechanism is simplified, parts with smaller sizes than the geometric model of the operating mechanism are removed, and all rounded corners are simplified to be right angles;
and carrying out parametric modeling by adopting UG software, naming each key structure parameter of the operation structure in the expression option of the UG software tool menu, exporting an expression file in an exp format, and recording the first parametric modeling process into a macro file in an exp/vb format.
3. The method for simulating the temperature and humidity field numerical value of the operating mechanism according to claim 1, wherein in the step S2, the whole of each region of the simplified geometric model is guided into a Workbench' S Meshing module for unstructured grid division, and grids of curved surfaces and edge regions are further refined;
determining the minimum grid size according to 1/5 of the minimum structure size of each region in the operating mechanism box body, wherein the maximum grid size is 1/100 of the maximum size of each region, the grid growth ratio is 1.2, the boundary layer grid is added for the internal fluid grid, and the first layer grid is determined according to the y+ value; exporting the completed grid model into a grid model in the format of cgns; and recording the first grid division process, and generating and exporting an automatic grid division script file in an rpl format.
4. The method for simulating the temperature and humidity field numerical value of the operating mechanism according to claim 1, wherein in the step S3, a grid model is led into a CFX preprocessing module, and a new wet air mixed material is established; the ideal air material in CFX is modified according to the physical parameters of the actual air, and the specific steps are as follows:
the aerodynamic viscosity calculation formula is:
the air heat conductivity calculation formula is:
air constant pressure specific heat capacity calculation formula:
c p ＝0.2348T+936.95
wherein: mu (mu) 0 Is the dynamic viscosity of the gas at 0 ℃, T 0 Lambda is the reference temperature 0 The thermal conductivity of the gas at 0℃and S the Sutherland constant.
5. The method for simulating the temperature and humidity field numerical value of the operating mechanism according to claim 1, wherein the step S4 specifically includes:
opening a simulation definition file, and carrying out numerical simulation of a temperature field and a humidity field in the operating mechanism box body in the CFX solving module; and setting parallel operation solution, and designating the existing calculation result as an initial iteration file.
6. The method for simulating the temperature and humidity field numerical value of the operating mechanism according to claim 1, wherein the step S5 specifically includes:
simulation result processing is carried out in the CFX post-processing module, a calculation formula of absolute humidity SH and relative humidity RH is customized, and absolute humidity SH=0.0025e 0.0817T Relative humidity rh=100×m s /SH，m s Steam mass fraction in the numerical result file; and solving the lowest temperature, the maximum humidity and the highest temperature of the surface of the heater in the box body of the operating mechanism through the self-contained function of the CFX post-processing module, and deriving a command stream file of the automatic post-processing in cst format.
7. The temperature and humidity field numerical simulation system of the operating mechanism based on the temperature and humidity field numerical simulation method of the operating mechanism as claimed in claim 1 is characterized by comprising the following steps:
the model simplifying module is used for simplifying the geometric model of the operating mechanism according to the structural characteristics of a typical operating mechanism, establishing a simplified geometric model containing air, ambient air and solid parts in a box body of the operating mechanism, naming each key structural parameter, and recording a macro file of automatic parametric modeling;
the grid division module is used for carrying out unstructured grid division on the fluid domain outside the operating mechanism box body, the fluid domain in the operating mechanism box body and the solid domain on the simplified geometric model to obtain a grid model, and recording a macro file of automatic grid division;
the numerical simulation module is used for carrying out numerical simulation calculation on the grid model, establishing corresponding external fluid domains, internal fluid domains and solid domains, setting interfaces of all calculation domains as coupling surfaces, setting corresponding boundary conditions of all calculation domains, correcting the air and steam material properties of the numerical simulation calculation according to the physical property parameters of the real wet air, carrying out solving and setting, generating a simulation definition file, and deriving an instruction stream file for automatic pretreatment; based on the simulation definition file, carrying out numerical simulation on a temperature field and a humidity field in the operating mechanism box body; performing simulation result processing, self-defining a relative humidity calculation formula, solving the minimum temperature and the maximum humidity in the box body of the operating mechanism and the maximum temperature of the surface of the heater, and leading out a command stream file for automatic post-processing;
and the rapid simulation module is used for sorting recorded macro files and command stream files of automatic modeling, grid division, preprocessing and post-processing, writing command line files of the automatic modeling, grid division, preprocessing and post-processing, and performing rapid simulation on a temperature and humidity field in the operating mechanism box body.
8. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the operating mechanism thermal field numerical simulation method of any one of claims 1-6 when the computer program is executed.
9. A computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the operating mechanism thermal field numerical simulation method of any one of claims 1-6.
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