CN112446150B - Three-dimensional visualization method and system for temperature field of double-water internal cooling synchronous camera - Google Patents
Three-dimensional visualization method and system for temperature field of double-water internal cooling synchronous camera Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 144
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 142
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 238000007794 visualization technique Methods 0.000 title claims abstract description 17
- 239000000498 cooling water Substances 0.000 claims abstract description 66
- 238000004364 calculation method Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 48
- 238000012546 transfer Methods 0.000 claims description 37
- 239000010949 copper Substances 0.000 claims description 32
- 229910052802 copper Inorganic materials 0.000 claims description 32
- 230000005284 excitation Effects 0.000 claims description 29
- 230000020169 heat generation Effects 0.000 claims description 29
- 238000004088 simulation Methods 0.000 claims description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 17
- 230000001419 dependent effect Effects 0.000 claims description 14
- 230000000007 visual effect Effects 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 6
- 230000009977 dual effect Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 238000012800 visualization Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000007620 mathematical function Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 238000013508 migration Methods 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract description 2
- 239000012212 insulator Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
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Abstract
The application discloses a three-dimensional visualization method and a system for a temperature field of a double-water internal cooling synchronous camera, which comprise a three-dimensional simplified model of the double-water internal cooling synchronous camera, calculation of the temperature field of the simplified three-dimensional simplified model of the double-water internal cooling synchronous camera, a function application model of a heat source, a function model of heat dissipation coefficients under different cooling water flow rates and the like. The method simplifies the body model of the double-water internal cooling synchronous camera; the application has the advantage of superior migration of App; the function application model of the heat source ensures that the heat source application is simpler, and only the exciting current and the cooling water flow rate of the double-water internal cooling synchronous regulator are input; the function of the heat dissipation coefficient at different cooling water flow rates makes it possible to calculate the temperature field at different cooling water flow rates. The application can realize the simplified calculation of the temperature field of the double-water internal cooling synchronous camera, and the model interface is more concise and clear, so that non-professional personnel can also finish the calculation setting of the temperature field of the double-water internal cooling synchronous camera.
Description
Technical Field
The invention belongs to the technical field of simulation of temperature fields of synchronous cameras, and relates to a three-dimensional visualization method and system of a temperature field of a double-water internal cooling synchronous camera.
Background
In order to enhance reactive compensation and reactive balance in a power system, inhibit system overvoltage and improve electric energy quality and power supply reliability, the synchronous phase regulator has the technical advantages of strong short-time overload capacity, small influence of bus voltage on reactive output and capability of providing a certain moment of inertia support for an alternating current system, and is widely used in an extra-high voltage direct current transmission system.
The double-water internal cooling synchronous phase-regulating machine can generate energy loss in the running process, wherein the energy loss comprises the loss of a stator coil and a rotor coil, the loss of a stator iron core and a rotor iron core, the friction loss between an air gap and a rotor, the excitation loss, the mechanical loss and the like. These losses ultimately translate into heat that increases the temperature of the dual water internal cooling synchronous tuner. Therefore, the double-water internal cooling synchronous regulating camera is often provided with a cooling system to control the temperature rise of each part within an allowable range, otherwise, the double-water internal cooling synchronous regulating camera works at an excessively high temperature for a long time to cause insulation aging, the service life is reduced, and the coil is burnt out when serious, so that serious accidents are caused.
The three-dimensional virtual visualization technology is flexible, changeable, visual and effective, the camera is used as important equipment of a transformer substation, the three-dimensional visual technology is applied to the internal state reproduction of the camera, the simulation of the whole fault process of the double-water internal cooling synchronous camera is of great significance, and the three-dimensional virtual visualization technology plays an important role in operation, maintenance and overhaul.
Disclosure of Invention
In order to solve the defects in the prior art, the application provides a three-dimensional visualization method and a three-dimensional visualization system for a temperature field of a double-water internal cooling synchronous camera.
In order to achieve the above object, the present invention adopts the following technical scheme:
A three-dimensional visualization method for a temperature field of a double-water internal cooling synchronous camera is characterized by comprising the following steps of:
the method comprises the following steps:
Step 1: establishing a three-dimensional model of a double-water internal cooling synchronous camera;
step 2: performing grid division on the three-dimensional model of the double-water internal cooling synchronous camera;
step 3: determining material properties in a three-dimensional model of the double-water internal cooling synchronous camera;
step 4: calculating exciting current and armature current of the synchronous phase-change machine under different working conditions to fit a V-shaped curve of the double-water internal cooling synchronous phase-change machine, wherein the independent variable is the exciting current and the dependent variable is the armature current;
step 5: calculating the heat generation rate of the double-water internal cooling synchronous camera, and taking the heat generation rate as the heat power load required by temperature field simulation;
Step 6: calculating the heat convection coefficients of the inner surface and the outer surface of the stator and the outer surface of the rotor and cooling wind, and calculating the heat convection coefficients of the hollow wires in the stator coil and the rotor coil and cooling water to serve as temperature field simulation boundary conditions;
Step 7: simulating a temperature field of the double-water internal cooling synchronous camera according to the heat generation rate obtained in the step 5 and the convection heat exchange coefficient obtained in the step 6;
Step 8: establishing a functional relation of the flow rate of cooling water and the convective heat transfer coefficient between the hollow wire and the cooling water, wherein the independent variable is the flow rate of the cooling water and the dependent variable is the convective heat transfer coefficient between the hollow wire and the cooling water;
Step 9: on the basis of the completed simulation of the temperature field of the double-water internal cooling synchronous camera, calculating the temperature field of the double-water internal cooling synchronous camera;
step 10: and carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous camera.
The invention further comprises the following preferable schemes:
Preferably, in step 1, when the three-dimensional model of the double-water internal cooling synchronous camera is built, the solid copper wire, the inter-turn insulation and the hollow copper wire are simplified into an integral heat conductor.
Preferably, in step 2, the three-dimensional model of the dual-water internal cooling synchronous camera is subjected to grid division by adopting the maximum grid density.
Preferably, the material properties of step 3 include electrical conductivity, thermal conductivity and specific heat capacity of the material.
Preferably, in step 4, according to the two-dimensional model of the double-water internal cooling synchronous phase-adjusting device, in Maxwell software, an external circuit is adopted to calculate exciting current and armature current of the synchronous phase-adjusting device under different working conditions so as to fit a V-shaped curve of the double-water internal cooling synchronous phase-adjusting device, wherein the independent variable is the exciting current and the dependent variable is the armature current.
Preferably, in step 5, the heat generation rate q is calculated as:
q＝P/V；
Wherein q, P and V are respectively the heat generation rate, the power loss and the volume of the entity unit;
the power loss P comprises copper loss and iron loss;
Wherein, the iron loss is a known constant 498kW;
Copper loss is divided into excitation copper loss P f generated by excitation current through a copper wire and armature copper loss P Cu generated by armature current through a copper wire;
the calculation formula of P f of excitation copper loss is as follows:
Wherein P fN is excitation copper loss under a rated working condition, I Fn is rated excitation current, and I f is variable excitation current;
the calculation formula of the armature copper loss P Cu is as follows:
Wherein P CuN is armature copper loss under rated working condition, and I N is rated armature current.
Preferably, in step 6, the inner surface and the outer surface of the stator and the outer surface of the rotor are set as radiating surfaces;
The convection heat exchange coefficients of the inner surface of the stator, the outer surface of the rotor and the cooling wind are
The convective heat transfer coefficient of the outer surface of the stator and the cooling wind is as follows:
The convective heat transfer coefficient of the hollow wire and the cooling water is as follows:
Wherein v e is the peripheral speed of the rotor, v i takes an empirical value of 5m/s;
N uf is the Knoop coefficient of the fluid, N uf＝0.023Re0.8Pr0.4, pr is the Plantl number, re is the Reynolds number, V, ρ, μ are cooling water flow rate, cooling water density, dynamic viscosity, respectively;
Lambda f is the thermal conductivity of the fluid and d is the diameter of the cooling water pipe.
Preferably, in step 9, on the basis of the completed simulation of the temperature field of the double-water internal-cooling synchronous camera, the V-shaped curve of the double-water internal-cooling synchronous camera obtained by fitting in step 4 and the function between the cooling water flow rate and the convective heat transfer coefficient between the hollow wire and the cooling water established in step 8 are used as built-in functions, and the self-defined variables of armature copper loss P Cu, excitation copper loss P f, armature current I Cu and excitation current I f are used for calculating the temperature field of the double-water internal-cooling synchronous camera by inputting different excitation currents and cooling water flow rates.
Preferably, in step 10, an App developer module using COMSOL software performs three-dimensional visual display of the temperature field on the double-water internal cooling synchronous camera with completed temperature field calculation, step 9 defined variables and step 8 mathematical functions.
The invention also discloses a three-dimensional visualization system of the temperature field of the double-water internal cooling synchronous camera, which comprises:
The modeling module is used for establishing a three-dimensional model of the double-water internal cooling synchronous camera;
the gateway dividing module is used for carrying out grid division on the three-dimensional model of the double-water internal cooling synchronous camera;
the material attribute setting module is used for determining material attributes in the three-dimensional model of the double-water internal cooling synchronous camera;
the first calculation module is used for calculating exciting current and armature current of the synchronous phase-change machine under different working conditions so as to fit a V-shaped curve of the double-water internal cooling synchronous phase-change machine, wherein the independent variable is the exciting current and the dependent variable is the armature current;
the second calculation module is used for calculating the heat generation rate of the double-water internal cooling synchronous camera and taking the heat generation rate as the thermal power load required by temperature field simulation;
the third calculation module is used for calculating the heat convection coefficients of the inner surface and the outer surface of the stator and the outer surface of the rotor and cooling wind, and calculating the heat convection coefficients of the hollow wires in the stator coil and the rotor coil and cooling water, and the heat convection coefficients are used as temperature field simulation boundary conditions;
the simulation module is used for simulating the temperature field of the double-water internal cooling synchronous camera according to the heat generation rate and the convection heat transfer coefficient;
The functional relation establishing module is used for establishing a functional relation of the flow rate of the cooling water and the convective heat transfer coefficient between the hollow wire and the cooling water, wherein the independent variable is the flow rate of the cooling water and the dependent variable is the convective heat transfer coefficient between the hollow wire and the cooling water;
The temperature field calculation module is used for calculating the temperature field of the double-water internal cooling synchronous camera on the basis of the completed double-water internal cooling synchronous camera temperature field simulation;
And the three-dimensional visual display module is used for carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous camera.
The application has the beneficial effects that:
1. the calculation speed can be improved under the condition that the temperature distribution of the double-water internal cooling synchronous camera can be reflected by simplifying the double-water internal cooling synchronous camera model.
2. The relation between exciting currents and armature currents of the double-water internal cooling synchronous speed regulator under different operation conditions is considered, a two-dimensional simulation model is used for calculating a V-shaped curve of the double-water internal cooling synchronous speed regulator, the V-shaped curve is fitted to a functional relation between the exciting currents and the armature currents, the V-shaped curve is used for calculating the heat generation rate of the double-water internal cooling synchronous speed regulator under different operation conditions, and an operator can automatically calculate the corresponding armature currents only by inputting the exciting currents and is used for calculating corresponding armature losses and exciting losses.
3. Under the condition that the temperature field of the double-water internal cooling synchronous camera is obtained through simulation, the exciting current and the cooling water flow rate are used as independent variables, the temperature field of the double-water internal cooling synchronous camera under the input is calculated according to the input of personnel, and the development of three-dimensional visual software of the double-water internal cooling synchronous camera is completed by adopting an App developer of COMSOL soft armor. Namely, the function application model of the heat source ensures that the heat source application is more concise, and only the exciting current and the cooling water flow rate of the double-water internal cooling synchronous regulator are input; the function model of the heat dissipation coefficient at different cooling water flow rates enables temperature field calculation at different cooling water flow rates.
Drawings
FIG. 1 is a flow chart of a three-dimensional visualization method of a temperature field of a double-water internal cooling synchronous camera;
FIG. 2 is a simplified three-dimensional model of a dual water cooled synchronous camera according to the present invention;
FIG. 3 is a partially simplified three-dimensional model of a dual water-cooled synchronous camera according to the present invention;
Fig. 4 is an interface diagram of a three-dimensional visualization of the temperature field of a dual water-cooled synchronous camera according to the present invention, shown as stator portions.
Detailed Description
The application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
As shown in FIG. 1, the three-dimensional visualization method for the temperature field of the double-water internal cooling synchronous camera comprises the following steps:
Step 1: and establishing a three-dimensional model of the double-water internal cooling synchronous camera according to the actual physical structure and the heat transfer theory of the double-water internal cooling synchronous camera.
The invention establishes a simplified three-dimensional model of the double-water internal cooling synchronous camera, and carries out equivalent treatment on cooling water in the form of convective heat transfer coefficient.
When a three-dimensional model of the double-water internal cooling synchronous camera is established, a part of heat conductor is simplified into an integral heat conductor, and a simplified simulation model is obtained;
The simplified heat conductor comprises a stator, a rotor, a solid copper wire, a main insulator, an inter-turn insulator, a hollow copper wire and cooling water;
The solid copper wire, the inter-turn insulation and the hollow copper wire are simplified into an integral heat conductor.
As shown in fig. 2, when a three-dimensional model of the double-water internal cooling synchronous regulator is built, a simplified processing mode is adopted, wherein 1 is a designated sub-iron core, and 2 is a rotor iron core;
as shown in fig. 2, (1) is a stator and rotor insulating portion and a wire, (2) is a simplified stator and rotor insulating portion and a wire, 3 means a simplified stator and rotor insulating portion, and 4 means a simplified wire;
Step 2: and (3) carrying out grid division on the three-dimensional model of the double-water internal cooling synchronous camera by adopting low density, namely selecting the largest grid density division when carrying out grid division in software, so that the grid number is reduced as much as possible, and the calculation speed is ensured.
Step 3: and determining the material properties of each part in the three-dimensional model of the double-water internal cooling synchronous tuner, wherein the material properties comprise the electrical conductivity, the thermal conductivity coefficient and the specific heat capacity of the material.
And on the premise of determining the material properties of the double-water internal cooling synchronous camera system, setting the material properties in the built double-water internal cooling synchronous camera three-dimensional model.
Step 4: according to a two-dimensional model of the double-water internal cooling synchronous phase-change machine, in Maxwell software, adopting an external circuit mode to calculate exciting current and armature current of the synchronous phase-change machine under different working conditions so as to fit a V-shaped curve of the double-water internal cooling synchronous phase-change machine, wherein an independent variable is the exciting current and a dependent variable is the armature current;
step 5: and calculating the heat generation rate of the double-water internal cooling synchronous camera, and taking the heat generation rate as the thermal power load required by temperature field simulation.
When the double-water internal cooling synchronous speed regulator operates, copper loss is generated by the exciting wire and the armature wire due to current flowing, namely copper loss P Cu is generated by the exciting current through the copper wire and the armature current through the copper wire, iron loss P Fe is generated by the rotor and the stator, and then the heat generation rate of the double-water internal cooling synchronous speed regulator can be obtained.
The heat generation rate is defined as heat loss of unit volume, the heat loss is loaded on a corresponding entity unit of a temperature field in a heat generation rate mode, and a heat generation rate q calculation formula is as follows:
q＝P/V；
Wherein q, P and V are respectively the heat generation rate, the power loss and the volume of the entity unit;
the power loss P is copper loss and iron loss respectively;
Wherein, the iron loss is a known constant 498kW;
Copper loss is divided into excitation copper loss P f generated by excitation current through a copper wire and armature copper loss P Cu generated by armature current through a copper wire;
the calculation formula of P f of excitation copper loss is as follows:
Wherein P fN is excitation copper consumption 796kW under a rated working condition, I Fn is rated excitation current 1835A, and I f is variable excitation current;
the calculation formula of the armature copper loss P Cu is as follows: ；
Wherein P CuN is the armature copper loss 491kW under the rated working condition, and I N is the rated armature current 8660A.
Step 6: the accurate calculation of the convection heat transfer coefficient of the double-water internal cooling synchronous speed regulator and the surrounding environment is a key for simulating the temperature field of the double-water internal cooling synchronous speed regulator, when the double-water internal cooling synchronous speed regulator is operated, the rotor rotates to drive the end fan to rotate, so that the convection heat transfer with cooling air exists on the inner surface of the stator and the outer surface of the rotor, the convection heat transfer with cooling water exists on hollow wires in the stator coil and the rotor coil, the wind speed of the cooling air and the flow velocity of the cooling water are determined according to the theory of heat transfer, the convection heat transfer coefficients of the inner surface of the stator, the outer surface of the stator and the outer surface of the rotor and the cooling air are calculated, and the convection heat transfer coefficient of the hollow wires in the stator coil and the rotor coil and the cooling water is calculated and is used as a boundary condition for simulating the temperature field.
The convective heat transfer coefficient of the inner surface of the stator is approximately equal to the convective heat transfer coefficient of the outer surface of the rotor.
The inner surface and the outer surface of the stator and the outer surface of the rotor are arranged as radiating surfaces,
The convection heat exchange coefficients of the inner surface of the stator, the outer surface of the rotor and the cooling wind are
The convective heat transfer coefficient of the outer surface of the stator and the cooling wind is as follows:
v e is the rotor peripheral speed and v i takes an empirical value of 5m/s.
The convective heat transfer coefficient of the hollow wire and the cooling water is as follows:
wherein the N uf＝0.023Re0.8Pr0.4 is a total number of the components, N uf is the Knoossel coefficient of the fluid, lambda f is the heat conductivity coefficient of the fluid, d is the diameter of the cooling water pipeline, pr is the Plantt number, re is the Reynolds number, and v, ρ and μ are the cooling water flow rate, the cooling water density and the dynamic viscosity respectively; .
Step 7: according to the heat generation rate and the convection heat transfer coefficient, excitation, namely the thermal power load required by simulation, is set in COMSOL software: the heat generation rate and boundary conditions, namely convection heat transfer coefficients, simulate to obtain the temperature field of the double-water internal cooling synchronous camera;
Step 8: according to a theory of heat transfer, a functional relation of the flow rate of cooling water and the convective heat transfer coefficient between the hollow wire and the cooling water is established, wherein the independent variable is the flow rate of the cooling water and the dependent variable is the convective heat transfer coefficient between the hollow wire and the cooling water;
Step 9: on the basis of the completed simulation of the temperature field of the double-water internal cooling synchronous camera, calculating the temperature field of the double-water internal cooling synchronous camera;
On the basis of the completed simulation of the temperature field of the double-water internal-cooling synchronous camera, the COMSOL software is utilized to fit the V-shaped curve of the double-water internal-cooling synchronous camera obtained in the step 4 and the function between the cooling water flow rate and the convective heat transfer coefficient between the hollow wire and the cooling water established in the step 8, and the function is used as a built-in function to customize the variables: the armature copper loss P Cu, the excitation copper loss P f, the armature current I Cu and the excitation current I f are as shown in fig. 4, and the temperature field of the double-water internal cooling synchronous camera can be calculated by inputting different excitation currents and cooling water flow rates.
Step 10: and an App developer module of the COMSOL software is utilized to perform three-dimensional visual display of the temperature field on the double-water internal cooling synchronous camera which is completed by the temperature field calculation, the definition variable and the mathematical function.
The invention discloses a temperature field three-dimensional visualization system of a double-water internal cooling synchronous camera, which comprises the following components:
The modeling module is used for establishing a three-dimensional model of the double-water internal cooling synchronous camera;
the gateway dividing module is used for carrying out grid division on the three-dimensional model of the double-water internal cooling synchronous camera;
the material attribute setting module is used for determining material attributes in the three-dimensional model of the double-water internal cooling synchronous camera;
the first calculation module is used for calculating exciting current and armature current of the synchronous phase-change machine under different working conditions so as to fit a V-shaped curve of the double-water internal cooling synchronous phase-change machine, wherein the independent variable is the exciting current and the dependent variable is the armature current;
the second calculation module is used for calculating the heat generation rate of the double-water internal cooling synchronous camera and taking the heat generation rate as the thermal power load required by temperature field simulation;
the third calculation module is used for calculating the heat convection coefficients of the inner surface and the outer surface of the stator and the outer surface of the rotor and cooling wind, and calculating the heat convection coefficients of the hollow wires in the stator coil and the rotor coil and cooling water, and the heat convection coefficients are used as temperature field simulation boundary conditions;
the simulation module is used for simulating the temperature field of the double-water internal cooling synchronous camera according to the heat generation rate and the convection heat transfer coefficient;
The functional relation establishing module is used for establishing a functional relation of the flow rate of the cooling water and the convective heat transfer coefficient between the hollow wire and the cooling water, wherein the independent variable is the flow rate of the cooling water and the dependent variable is the convective heat transfer coefficient between the hollow wire and the cooling water;
The temperature field calculation module is used for calculating the temperature field of the double-water internal cooling synchronous camera on the basis of the completed double-water internal cooling synchronous camera temperature field simulation;
And the three-dimensional visual display module is used for carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous camera.
The invention simplifies the body model of the double-water internal cooling synchronous camera, and has superior migration of App; the function application model of the heat source ensures that the heat source application is simpler, and only the exciting current and the cooling water flow rate of the double-water internal cooling synchronous regulator are input; the function of the heat dissipation coefficient at different cooling water flow rates makes it possible to calculate the temperature field at different cooling water flow rates. The invention can realize the simplified calculation of the temperature field of the double-water internal cooling synchronous camera, and the model interface is more concise and clear, so that non-professional personnel can also finish the calculation setting of the temperature field of the double-water internal cooling synchronous camera.
While the applicant has described and illustrated the embodiments of the present invention in detail with reference to the drawings, it should be understood by those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not to limit the scope of the present invention, but any improvements or modifications based on the spirit of the present invention should fall within the scope of the present invention.
Claims (9)
1. A three-dimensional visualization method for a temperature field of a double-water internal cooling synchronous camera is characterized by comprising the following steps of:
the method comprises the following steps:
Step 1: establishing a three-dimensional model of a double-water internal cooling synchronous camera;
step 2: performing grid division on the three-dimensional model of the double-water internal cooling synchronous camera;
step 3: determining material properties in a three-dimensional model of the double-water internal cooling synchronous camera;
step 4: calculating exciting current and armature current of the synchronous phase-change machine under different working conditions to fit a V-shaped curve of the double-water internal cooling synchronous phase-change machine, wherein the independent variable is the exciting current and the dependent variable is the armature current;
step 5: calculating the heat generation rate of the double-water internal cooling synchronous camera, and taking the heat generation rate as the heat power load required by temperature field simulation;
Step 6: calculating the heat convection coefficients of the inner surface and the outer surface of the stator and the outer surface of the rotor and cooling wind, and calculating the heat convection coefficients of the hollow wires in the stator coil and the rotor coil and cooling water to serve as temperature field simulation boundary conditions;
Step 7: simulating a temperature field of the double-water internal cooling synchronous camera according to the heat generation rate obtained in the step 5 and the convection heat exchange coefficient obtained in the step 6;
Step 8: establishing a functional relation of the flow rate of cooling water and the convective heat transfer coefficient between the hollow wire and the cooling water, wherein the independent variable is the flow rate of the cooling water and the dependent variable is the convective heat transfer coefficient between the hollow wire and the cooling water;
Step 9: on the basis of the completed simulation of the temperature field of the double-water internal cooling synchronous camera, calculating the temperature field of the double-water internal cooling synchronous camera;
In the step 9, on the basis of the completed double-water internal cooling synchronous camera temperature field simulation, the V-shaped curve of the double-water internal cooling synchronous camera obtained by fitting in the step 4 and the function between the cooling water flow rate and the convective heat transfer coefficient between the hollow wire and the cooling water established in the step 8 are used as built-in functions, and the self-defined variables of armature copper consumption P Cu, excitation copper consumption P f, armature current I Cu and excitation current I f are used for calculating the double-water internal cooling synchronous camera temperature field by inputting different excitation currents and cooling water flow rates;
step 10: and carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous camera.
2. The three-dimensional visualization method for the temperature field of the double-water internal cooling synchronous camera according to claim 1, which is characterized by comprising the following steps:
In the step 1, when a three-dimensional model of the double-water internal cooling synchronous camera is established, a solid copper wire, an inter-turn insulation and a hollow copper wire are simplified into an integral heat conductor.
3. The three-dimensional visualization method for the temperature field of the double-water internal cooling synchronous camera according to claim 1, which is characterized by comprising the following steps:
in the step 2, the three-dimensional model of the double-water internal cooling synchronous camera is subjected to grid division by adopting the maximum grid density.
4. The three-dimensional visualization method for the temperature field of the double-water internal cooling synchronous camera according to claim 1, which is characterized by comprising the following steps:
the material properties described in step 3 include electrical conductivity, thermal conductivity and specific heat capacity of the material.
5. The three-dimensional visualization method for the temperature field of the double-water internal cooling synchronous camera according to claim 1, which is characterized by comprising the following steps:
In step 4, according to a two-dimensional model of the double-water internal cooling synchronous phase-adjusting device, in Maxwell software, an external circuit mode is adopted, and exciting current and armature current of the synchronous phase-adjusting device under different working conditions are calculated to fit a V-shaped curve of the double-water internal cooling synchronous phase-adjusting device, wherein an independent variable is the exciting current, and a dependent variable is the armature current.
6. The three-dimensional visualization method for the temperature field of the double-water internal cooling synchronous camera according to claim 1, which is characterized by comprising the following steps:
in step 5, the heat generation rate q is calculated as:
q＝P/V；
Wherein q, P and V are respectively the heat generation rate, the power loss and the volume of the entity unit;
the power loss P comprises copper loss and iron loss;
Wherein, the iron loss is a known constant 498kW;
Copper loss is divided into excitation copper loss P f generated by excitation current through a copper wire and armature copper loss P Cu generated by armature current through a copper wire;
the calculation formula of P f of excitation copper loss is as follows:
Wherein P fN is excitation copper loss under a rated working condition, I Fn is rated excitation current, and I f is variable excitation current;
the calculation formula of the armature copper loss P Cu is as follows:
Wherein P CuN is armature copper loss under rated working condition, and I N is rated armature current.
7. The three-dimensional visualization method for the temperature field of the double-water internal cooling synchronous camera according to claim 1, which is characterized by comprising the following steps:
In the step 6, the inner surface and the outer surface of the stator and the outer surface of the rotor are set as radiating surfaces;
The convection heat exchange coefficients of the inner surface of the stator, the outer surface of the rotor and the cooling wind are
The convective heat transfer coefficient of the outer surface of the stator and the cooling wind is as follows:
The convective heat transfer coefficient of the hollow wire and the cooling water is as follows:
Wherein v e is the peripheral speed of the rotor, v i takes an empirical value of 5m/s;
N uf is the Knoop coefficient of the fluid, N uf＝0.023Re0.8Pr0.4, pr is the Plantl number, re is the Reynolds number, V, ρ, μ are cooling water flow rate, cooling water density, dynamic viscosity, respectively;
Lambda f is the thermal conductivity of the fluid and d is the diameter of the cooling water pipe.
8. The three-dimensional visualization method for the temperature field of the double-water internal cooling synchronous camera according to claim 1, which is characterized by comprising the following steps:
In step 10, an App developer module of COMSOL software is used for carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous camera with the temperature field calculation, the definition variable of step 9 and the mathematical function of step 8.
9. The dual water internal cooling synchronous camera temperature field three-dimensional visualization system of the dual water internal cooling synchronous camera temperature field three-dimensional visualization method according to any one of claims 1-8, wherein:
The system comprises:
The modeling module is used for establishing a three-dimensional model of the double-water internal cooling synchronous camera;
the gateway dividing module is used for carrying out grid division on the three-dimensional model of the double-water internal cooling synchronous camera;
the material attribute setting module is used for determining material attributes in the three-dimensional model of the double-water internal cooling synchronous camera;
the first calculation module is used for calculating exciting current and armature current of the synchronous phase-change machine under different working conditions so as to fit a V-shaped curve of the double-water internal cooling synchronous phase-change machine, wherein the independent variable is the exciting current and the dependent variable is the armature current;
the second calculation module is used for calculating the heat generation rate of the double-water internal cooling synchronous camera and taking the heat generation rate as the thermal power load required by temperature field simulation;
the third calculation module is used for calculating the heat convection coefficients of the inner surface and the outer surface of the stator and the outer surface of the rotor and cooling wind, and calculating the heat convection coefficients of the hollow wires in the stator coil and the rotor coil and cooling water, and the heat convection coefficients are used as temperature field simulation boundary conditions;
the simulation module is used for simulating the temperature field of the double-water internal cooling synchronous camera according to the heat generation rate and the convection heat transfer coefficient;
The functional relation establishing module is used for establishing a functional relation of the flow rate of the cooling water and the convective heat transfer coefficient between the hollow wire and the cooling water, wherein the independent variable is the flow rate of the cooling water and the dependent variable is the convective heat transfer coefficient between the hollow wire and the cooling water;
The temperature field calculation module is used for calculating the temperature field of the double-water internal cooling synchronous camera on the basis of the completed double-water internal cooling synchronous camera temperature field simulation;
And the three-dimensional visual display module is used for carrying out three-dimensional visual display on the temperature field of the double-water internal cooling synchronous camera.
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