CN117521560B - Modeling method and device for supercritical carbon dioxide turbine model and computing equipment - Google Patents
Modeling method and device for supercritical carbon dioxide turbine model and computing equipment Download PDFInfo
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 79
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000012530 fluid Substances 0.000 claims abstract description 121
- 238000004134 energy conservation Methods 0.000 claims abstract description 29
- 230000008878 coupling Effects 0.000 claims abstract description 15
- 238000010168 coupling process Methods 0.000 claims abstract description 15
- 238000005859 coupling reaction Methods 0.000 claims abstract description 15
- 210000002445 nipple Anatomy 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 13
- 238000010276 construction Methods 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 6
- 239000012533 medium component Substances 0.000 claims description 3
- 238000004088 simulation Methods 0.000 abstract description 20
- 238000010248 power generation Methods 0.000 abstract description 18
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- 238000010586 diagram Methods 0.000 description 14
- 238000004364 calculation method Methods 0.000 description 8
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Abstract
The application discloses a modeling method, a modeling device and a computing device of a supercritical carbon dioxide turbine model, wherein the method comprises the following steps: determining the topology structure of a supercritical carbon dioxide turbine model; constructing an inlet connection pipe model based on a flow ratio-pressure ratio characteristic curve; the inlet connecting pipe model is used for obtaining an outlet pressure value of the control body model; constructing a control body model based on the flow ratio-efficiency characteristic curve, the energy conservation equation and the mass conservation equation; the control body model is used for obtaining the operation parameters of the control body model; constructing an outlet connection pipe model based on a momentum conservation equation; the outlet connecting pipe model is used for obtaining the outlet flow rate of the control body model; and coupling the control body model, the inlet connection pipe model, the outlet connection pipe model, the fluid interface and the mechanical interface based on the topological structure to obtain the supercritical carbon dioxide turbine model. The method and the device can meet the requirements of simulation analysis of the turbine module in the supercritical carbon dioxide Brayton cycle power generation system.
Description
Technical Field
The application relates to the technical field of modeling simulation, in particular to a modeling method, a device and computing equipment of a supercritical carbon dioxide turbine model.
Background
The supercritical carbon dioxide Brayton cycle power generation system is used as a novel power generation mode, and has the advantages of environment friendliness, compact system, high economical efficiency, high power generation efficiency and the like. The turbine is used as core equipment in the system, and the design mode directly influences the overall power generation efficiency of the system. At present, a model for dynamic simulation analysis of a turbine module in the system is lacking, so that the requirement for simulation analysis of the turbine module in the supercritical carbon dioxide Brayton cycle power generation system cannot be met.
The foregoing is merely provided to facilitate an understanding of the principles of the present application and is not admitted to be prior art.
Disclosure of Invention
The main purpose of the application is to provide a modeling method, a modeling device and a computing device for a supercritical carbon dioxide turbine model, and aims to solve the technical problem that the requirement for simulation analysis of a turbine module in a supercritical carbon dioxide Brayton cycle power generation system cannot be met at present.
To achieve the above object, the present application provides a modeling method of a supercritical carbon dioxide turbine model, the method comprising:
determining the topology of the supercritical carbon dioxide turbine model; the topological structure comprises a control body model, an inlet connection pipe model, an outlet connection pipe model, a fluid interface and a mechanical interface;
Constructing the inlet connection pipe model based on a flow ratio-pressure ratio characteristic curve; wherein the inlet tap model is configured to determine an outlet pressure value of the control body model based on a fluid input parameter and the flow ratio-to-pressure ratio characteristic; the fluid input parameters are obtained through the fluid interface;
constructing the control body model based on a flow ratio-efficiency characteristic curve, an energy conservation equation and a mass conservation equation; wherein the control body model is configured to determine an operating parameter of the control body model based on a mechanical input parameter, the fluid input parameter, the flow ratio-efficiency characteristic, the energy conservation equation, and the mass conservation equation; the mechanical input parameters are obtained through the mechanical interface;
constructing the outlet takeover model based on a momentum conservation equation; wherein the outlet takeover model is configured to determine an outlet flow rate of the control body model based on the fluid input parameter, the operating parameter, and the conservation of momentum equation;
and coupling the control body model, the inlet connection pipe model, the outlet connection pipe model, the fluid interface and the mechanical interface by the topological structure to obtain the supercritical carbon dioxide turbine model.
Optionally, the fluid input parameters include at least an inlet pressure value, an inlet temperature, an inlet flow, an inlet specific enthalpy, an inlet specific entropy, and inlet medium composition information.
Optionally, the mechanical input parameters include at least shaft rotational speed, shaft power, shaft torque, and shaft moment of inertia.
Optionally, the method further comprises:
dimensionless treatment is carried out on the inlet flow obtained by the fluid interface, and the flow ratio is determined;
and carrying out dimensionless treatment on the shaft rotating speed acquired by the mechanical interface, and determining a rotating speed ratio.
Optionally, the dimensionless determining the inlet flow acquired by the fluid interface, to determine a flow ratio, includes:
acquiring a preset rated flow;
determining a ratio between the inlet flow rate and the rated flow rate as a flow rate ratio;
and said dimensionless determination of said shaft rotational speed obtained by said mechanical interface, determining a rotational speed ratio, comprising:
acquiring a preset rated rotation speed;
a ratio between the shaft rotational speed and the rated rotational speed is determined as a rotational speed ratio.
Optionally, the process of determining the outlet pressure value of the control body model by the inlet nipple model based on the fluid input parameter and the flow ratio-pressure ratio characteristic curve includes the steps of:
Determining a turbine pressure ratio corresponding to the flow ratio based on the flow ratio-pressure ratio characteristic;
and calculating the fluid input parameter and the turbine pressure ratio, and determining an outlet pressure value of the control body model.
Optionally, the process for determining the operating parameters of the control body model based on the mechanical input parameters, the fluid input parameters, the flow ratio-efficiency characteristic curve, the energy conservation equation, and the mass conservation equation comprises the steps of:
determining turbine efficiency corresponding to the speed ratio based on the flow ratio-efficiency characteristic;
based on the inlet specific entropy and the outlet pressure value, calculating to obtain isentropic specific enthalpy;
calculating to obtain outlet specific enthalpy based on the inlet specific enthalpy, the isentropic specific enthalpy and the turbine efficiency;
calculating to obtain an outlet temperature based on the outlet specific enthalpy and the outlet pressure value;
calculating the turbine efficiency, the inlet specific enthalpy and the isentropic specific enthalpy based on the energy conservation equation and the mass conservation equation, and determining the specific energy of the control body model;
the turbine efficiency, the outlet temperature and the specific energy content are determined as operating parameters of the control body model.
In addition, in order to achieve the above object, the present application further provides a modeling apparatus for a supercritical carbon dioxide turbine model, the apparatus comprising:
the determining unit is used for determining the topological structure of the supercritical carbon dioxide turbine model; the topological structure comprises a control body model, an inlet connection pipe model, an outlet connection pipe model, a fluid interface and a mechanical interface;
a first construction unit for constructing the inlet nipple model based on a flow ratio-pressure ratio characteristic curve; wherein the inlet tap model is configured to determine an outlet pressure value of the control body model based on a fluid input parameter and the flow ratio-to-pressure ratio characteristic; the fluid input parameters are obtained through the fluid interface;
the second construction unit is used for constructing the control body model based on the flow ratio-efficiency characteristic curve, the energy conservation equation and the mass conservation equation; wherein the control body model is configured to determine an operating parameter of the control body model based on a mechanical input parameter, the fluid input parameter, the flow ratio-efficiency characteristic, the energy conservation equation, and the mass conservation equation; the mechanical input parameters are obtained through the mechanical interface;
A third construction unit for constructing the outlet takeover model based on a momentum conservation equation; wherein the outlet takeover model is configured to determine an outlet flow rate of the control body model based on the fluid input parameter, the operating parameter, and the conservation of momentum equation;
and the coupling unit is used for coupling the control body model, the inlet connection pipe model, the outlet connection pipe model, the fluid interface and the mechanical interface by the topological structure to obtain the supercritical carbon dioxide turbine model.
In addition, the present application also provides a computing device, including: at least one processor, memory, and input output unit; wherein the memory is for storing a computer program and the processor is for invoking the computer program stored in the memory to perform the method of any of the first aspects.
Furthermore, the application provides a computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method of any of the first aspects.
According to the modeling method, the modeling device and the computing equipment for the supercritical carbon dioxide turbine model, the control body model, the inlet connection pipe model and the outlet connection pipe model are constructed through obtaining the topological structure of the supercritical carbon dioxide turbine model, and the control body model, the inlet connection pipe model, the outlet connection pipe model, the fluid interface and the mechanical interface are coupled according to the obtained topological structure, so that the supercritical carbon dioxide turbine model is obtained; the obtained supercritical carbon dioxide turbine model can simulate a turbine module in the supercritical carbon dioxide Brayton cycle power generation system, obtain parameters of the turbine module in the simulation process, and can meet the requirements of simulation analysis of the turbine module in the supercritical carbon dioxide Brayton cycle power generation system.
Drawings
FIG. 1 is a schematic flow chart of a modeling method of a supercritical carbon dioxide turbine model according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a topology of a supercritical carbon dioxide turbine model according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a connection pipe model according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a control body model and an inlet nozzle model and an outlet nozzle model connection according to an embodiment of the present application;
FIG. 5 is a schematic diagram of components of a supercritical carbon dioxide turbine model according to one embodiment of the present application;
FIG. 6 is a schematic diagram of a turbine system simulation based on a supercritical carbon dioxide turbine model according to an embodiment of the present disclosure;
FIG. 7 is a schematic block diagram of a modeling apparatus for a supercritical carbon dioxide turbine model according to another embodiment of the present application.
FIG. 8 is a schematic structural diagram of a medium according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a computing device according to an embodiment of the present application.
Reference numerals illustrate: 90. a computing device; 901. a processing unit; 902. a system memory; 9021. RAM (random access memory); 9022. a cache memory; 9023. ROM (read only memory); 9024. a program module; 9025. program/utility of program modules; 903. a bus connecting the different system components; 904. an external device; 905. an I/O (input/output) interface; 906. a network adapter.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Those skilled in the art will appreciate that embodiments of the present application may be implemented as a system, apparatus, device, method, or computer program product. Thus, the present application may be embodied in the form of: complete hardware, complete software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
The existing supercritical carbon dioxide Brayton cycle power generation system is a novel power generation mode and has the advantages of environment friendliness, compact system, high economical efficiency, high power generation efficiency and the like. The turbine is used as core equipment in the system, and the design mode directly influences the overall power generation efficiency of the system. At present, a model for dynamic simulation analysis of a turbine module in the system is lacking, so that the requirement for simulation analysis of the turbine module in the supercritical carbon dioxide Brayton cycle power generation system cannot be met. To solve this problem, the main solutions of the embodiments of the present application are:
Determining the topology of the supercritical carbon dioxide turbine model; the topological structure comprises a control body model, an inlet connection pipe model, an outlet connection pipe model, a fluid interface and a mechanical interface;
constructing the inlet connection pipe model based on a flow ratio-pressure ratio characteristic curve; the inlet connection pipe model is used for obtaining an outlet pressure value of the control body model based on a fluid input parameter and the flow ratio-pressure ratio characteristic curve; the fluid input parameters are obtained through the fluid interface;
constructing the control body model based on a flow ratio-efficiency characteristic curve, an energy conservation equation and a mass conservation equation; the control body model is used for obtaining operation parameters of the control body model based on mechanical input parameters, the fluid input parameters, the flow ratio-efficiency characteristic curve, the energy conservation equation and the mass conservation equation; the mechanical input parameters are obtained through the mechanical interface;
constructing the outlet takeover model based on a momentum conservation equation; wherein the outlet nozzle model is configured to obtain an outlet flow rate of the control body model based on the fluid input parameter, the operating parameter, and the second conservation of momentum equation;
And coupling the control body model, the inlet connection pipe model, the outlet connection pipe model, the fluid interface and the mechanical interface based on the topological structure to obtain the supercritical carbon dioxide turbine model. According to the modeling method of the supercritical carbon dioxide turbine model, the control body model, the inlet connection pipe model and the outlet connection pipe model are constructed by acquiring the topological structure of the supercritical carbon dioxide turbine model, and the control body model, the inlet connection pipe model, the outlet connection pipe model, the fluid interface and the mechanical interface are coupled according to the acquired topological structure to obtain the supercritical carbon dioxide turbine model; the obtained supercritical carbon dioxide turbine model can simulate a turbine module in the supercritical carbon dioxide Brayton cycle power generation system, obtain parameters of the turbine module in the simulation process, and can meet the requirements of simulation analysis of the turbine module in the supercritical carbon dioxide Brayton cycle power generation system.
It should be noted that any number of elements in the figures are for illustration and not limitation, and that any naming is used for distinction only and not for limitation.
The principles and spirit of the present application are explained in detail below with reference to several representative embodiments thereof.
Referring to fig. 1, fig. 1 is a schematic flow chart of a modeling method of a supercritical carbon dioxide turbine model according to an embodiment of the present application. It should be noted that embodiments of the present application may be applied to any scenario where applicable. For example, embodiments of the present application may be applied to computing devices.
FIG. 1 shows a flow of a modeling method for a supercritical carbon dioxide turbine model according to an embodiment of the present application, including:
in step S101, the computing device determines a topology of the supercritical carbon dioxide turbine model.
In an embodiment of the present application, the topology may include a control body model, an inlet nozzle model, an outlet nozzle model, a fluid interface, and a mechanical interface. The topology structure of the obtained supercritical carbon dioxide turbine model can represent one or more models which need to be built in the supercritical carbon dioxide turbine model, and can also represent interfaces existing in the supercritical carbon dioxide turbine model and connection relations between the models and the interfaces.
Referring to fig. 2 together, fig. 2 is a schematic diagram of a topology structure of a supercritical carbon dioxide turbine model according to an embodiment of the present application, where the topology structure in the supercritical carbon dioxide turbine model may include, for example, a control body model, an inlet pipe-taking-over model, an outlet pipe-taking-over model, a mechanical interface, a first fluid interface, and a second fluid interface.
The connection relationship between the model and the interface may be: one end of the inlet connection pipe model can be connected with a first fluid interface, and the other end of the inlet connection pipe model can be connected with a control body model; the control body model can be connected with the mechanical interface and also can be connected with the outlet connecting pipe model; the other end of the outlet nipple mould may be connected to a second fluid interface.
It can be seen that the components contained in the supercritical carbon dioxide turbine model and the connection relationship between the components can be clearly obtained through the topology structure of the obtained supercritical carbon dioxide turbine model.
In this embodiment, the fluid interface may obtain a fluid input parameter, where the fluid input parameter may include at least an inlet pressure value, an inlet temperature, an inlet flow, an inlet specific enthalpy, an inlet specific entropy, and inlet medium component information. Furthermore, the fluid interface may also represent a connection relationship between modules or devices connected by the fluid interface.
The mechanical interface may obtain mechanical input parameters. The mechanical input parameters may include at least shaft rotational speed, shaft power, shaft torque, and shaft moment of inertia. The mechanical input parameter may be an obtained mechanical parameter of a generator coupled to the supercritical carbon dioxide turbine model.
The fluid input parameters and the mechanical input parameters can be preset parameters or parameters input in advance by a tester, namely the constructed turbine module can simulate based on the input fluid input parameters and mechanical input parameters, and further output result data obtained by simulation.
As an alternative embodiment, the present application may further perform the following steps:
dimensionless treatment is carried out on the inlet flow obtained by the fluid interface, and the flow ratio is determined;
and carrying out dimensionless treatment on the shaft rotating speed acquired by the mechanical interface, and determining a rotating speed ratio.
Optionally, the process of non-dimensionalizing the inlet flow obtained by the fluid interface and determining the flow ratio may include the following steps:
acquiring a preset rated flow;
determining a ratio between the inlet flow rate and the rated flow rate as a flow rate ratio;
and, the process of dimensionless determining the rotational speed ratio of the shaft obtained by the mechanical interface may include the steps of:
acquiring a preset rated rotation speed;
a ratio between the shaft rotational speed and the rated rotational speed is determined as a rotational speed ratio.
In the embodiment, the inlet flow and the shaft rotating speed can be dimensionless, so that the influence caused by the difference of the dimensions between the inlet flow and the shaft rotating speed is eliminated, and the flow ratio and the rotating speed ratio obtained by dimensionless are more normalized.
Step S102, the computing device builds the inlet take-over model based on the flow ratio-pressure ratio characteristic curve.
In embodiments of the present application, an inlet tap model may be used to determine an outlet pressure value of the control body model based on a fluid input parameter and the flow ratio-to-pressure ratio characteristic.
In the embodiment of the application, the flow ratio-pressure ratio characteristic curve may represent a correlation between the flow ratio and the pressure ratio; after the flow rate ratio is determined, the pressure ratio corresponding to the flow rate ratio can be determined through a flow rate ratio-pressure ratio characteristic curve; alternatively, after the pressure ratio is determined, the flow rate ratio corresponding to the flow rate ratio may be determined from a flow rate ratio-pressure ratio characteristic curve.
As an alternative embodiment, the process of determining the outlet pressure value of the control body model by the inlet nipple model based on the fluid input parameter and the flow ratio-pressure ratio characteristic curve may comprise the steps of:
determining a turbine pressure ratio corresponding to the flow ratio based on the flow ratio-pressure ratio characteristic;
and calculating the fluid input parameter and the turbine pressure ratio, and determining an outlet pressure value of the control body model.
According to the embodiment, the turbine pressure ratio corresponding to the flow ratio can be determined through the inlet connection pipe model by utilizing the flow ratio-pressure ratio characteristic curve, and then the obtained fluid input parameter and the turbine pressure ratio can be calculated to obtain the outlet pressure value of the control body model, so that the calculated outlet pressure value of the control body model is more accurate.
In the embodiment of the application, the outlet pressure value of the control body modelThe calculation formula of (2) can be:
wherein,for the inlet pressure value in the fluid input parameter, < +.>Is the turbine pressure ratio.
Step S103, the computing device builds the control body model based on the flow ratio-efficiency characteristic curve, the energy conservation equation and the mass conservation equation.
In this embodiment, the control body model may be configured to determine the operating parameters of the control body model based on the mechanical input parameters, the fluid input parameters, the flow ratio-efficiency characteristic, the conservation of energy equation, and the conservation of mass equation.
In the embodiment of the application, the flow ratio-efficiency characteristic curve may represent the correlation between the flow ratio and the efficiency; after the flow rate ratio is determined, the efficiency corresponding to the flow rate ratio can be determined through a flow rate ratio-efficiency characteristic curve; alternatively, after the efficiency is determined, the flow rate ratio corresponding to the flow rate ratio may be determined from the flow rate ratio-efficiency characteristic curve.
For example, the energy conservation equation and the mass conservation equation may be a gas-liquid energy conservation equation and a gas-liquid mass conservation equation. Alternatively, the energy conservation equation and the mass conservation equation may be equations in a two-fluid six equation.
As an alternative embodiment, the process of determining the operating parameters of the control body model based on the mechanical input parameters, the fluid input parameters, the flow ratio-efficiency characteristic curve, the energy conservation equation, and the mass conservation equation may comprise the steps of:
determining turbine efficiency corresponding to the speed ratio based on the flow ratio-efficiency characteristic;
based on the inlet specific entropy and the outlet pressure value, calculating to obtain isentropic specific enthalpy;
calculating to obtain outlet specific enthalpy based on the inlet specific enthalpy, the isentropic specific enthalpy and the turbine efficiency;
calculating to obtain an outlet temperature based on the outlet specific enthalpy and the outlet pressure value;
calculating the turbine efficiency, the inlet specific enthalpy and the isentropic specific enthalpy based on the energy conservation equation and the mass conservation equation, and determining the specific energy of the control body model;
the turbine efficiency, the outlet temperature and the specific energy content are determined as operating parameters of the control body model.
In the implementation of the embodiment, the turbine efficiency corresponding to the rotation speed ratio can be determined by the control body model through the flow ratio-efficiency characteristic curve, and then the operation parameters of a plurality of control body models can be obtained through calculation based on the turbine efficiency and a plurality of parameters obtained from the fluid input parameters, so that the obtained control body parameters are more diversified.
In the embodiment of the application, isentropic specific enthalpyThe calculation formula of (2) can be:
wherein,for inlet specific entropy in the fluid input parameters, < +.>To control the outlet pressure value of the body model.
Specific enthalpy of outletThe calculation formula of (2) can be:
wherein,for inlet specific enthalpy in the fluid input parameters, +.>For turbine efficiency>Is isentropic specific enthalpy.
In addition, the outlet temperatureThe calculation formula of (2) can be:
in the embodiment of the present application, the energy conservation equation is:
the mass conservation equation is:
wherein,krepresenting a gasgOr a liquidl；iRepresenting an interface;representing the volume percentage of the gas phase and the liquid phase; />Representing density; />Representing the area, controlling the ratio of volume to length of the body; t represents time; z represents a z-direction length, i.e., an axial length; p may represent pressure; />Representing the speed; />Indicating the exchange amount of the interface substance; />Representation of specific internal energy; />Representing pressure; />Indicating wall heat transfer; />Indicating that the interface is transferring heat; />Indicating the exchange amount of the interface substance; />Representing the wall material exchange amount;representing energy dissipation; />Representing wall friction; />Represents interfacial friction; />Indicating the effect of the external force field.
In step S104, the computing device builds the outlet nozzle model based on the momentum conservation equation.
In an embodiment of the present application, the outlet nozzle model is configured to determine an outlet flow rate of the control body model based on the fluid input parameter, the operation parameter, and the momentum conservation equation; the flow direction parameter and the wall friction parameter may not be included in the momentum conservation equation.
In the embodiment of the present application, the momentum conservation equation may be:
the pressure change and the energy change of the turbine are calculated according to the characteristic curve, and the outlet connection pipe model is used as a part of a component of the supercritical carbon dioxide turbine model, so that the energy and the pressure change do not need to be considered repeatedly, and therefore, the flow direction parameter and the wall friction parameter in the momentum conservation equation can be shielded.
Step S105, the computing device couples the control body model, the inlet pipe model, the outlet pipe model, the fluid interface and the mechanical interface with the topology structure, so as to obtain the supercritical carbon dioxide turbine model.
FIG. 3 is a schematic structural diagram of a connection pipe model according to an embodiment of the present disclosure; the take-over model can comprise N inlet take-over pipes and N outlet take-over pipes (N can be a positive integer), one end of each inlet take-over pipe can be provided with a fluid interface a, and fluid can enter the inlet take-over pipe through the fluid interface a; the other end of the inlet nipple may be connected to the outlet nipple, and the other end of the outlet nipple may be provided with a fluid interface b through which fluid may be discharged from the outlet nipple.
FIG. 4 is a schematic diagram of a control body model and an inlet nozzle model and an outlet nozzle model connection according to an embodiment of the present application; wherein, it can be seen that the control body model is provided with a mechanical interface, and the control body model is connected with the inlet take-over model and the outlet take-over model, and the fluid interface can be arranged on the inlet take-over model because the fluid enters the control body model through the inlet take-over model; furthermore, since the fluid can also be discharged through the outlet nipple mould, the fluid connection can also be provided on the outlet nipple mould.
FIG. 5 is a schematic diagram of components of a supercritical carbon dioxide turbine model according to one embodiment of the present application; wherein A can be a control body model, B can be an inlet take-over model, and C can be an outlet take-over model; x and y may both be fluidic interfaces and z may be mechanical interfaces.
FIG. 6 is a schematic diagram of a turbine system simulation based on a supercritical carbon dioxide turbine model according to an embodiment of the present disclosure; wherein A can be a control body model, B can be an inlet connection model, C can be an outlet connection model, D can be a generator, E and G can be pipeline model components, F can be a flow inlet component, and H can be a pressure outlet component; x and y may both be fluidic interfaces and z may be mechanical interfaces.
Specifically, referring to fig. 3, 4, 5 and 6, the flow inlet assembly F may input supercritical carbon dioxide into the pipe model assembly E, the pipe model assembly E is connected to the inlet pipe model B through the fluid interface x, and the supercritical carbon dioxide is input to the control body model a through the fluid interface x and the inlet pipe model B; the control body model A can convert the energy contained in the supercritical carbon dioxide into kinetic energy, and the generator D generates electricity through the mechanical interface z; and the pipeline model assembly G is connected with the outlet nipple model C through the fluid interface y such that supercritical carbon dioxide is input to the pipeline model assembly G through the fluid interface y and through the outlet nipple model C, which can input supercritical carbon dioxide into the pressure outlet assembly H.
In the embodiment of the present application, after step S105, the constructed supercritical carbon dioxide turbine model may be connected with the pipeline model and the boundary model, so as to construct a turbine simulation system, and realize turbine system simulation under different working conditions and parameters.
For example, the obtained supercritical carbon dioxide turbine model may be simulated, and parameters in the simulation process may be set as follows: rated flow rate 64.5 kg/s, rated rotation speed 8000rpm, simulation duration 150s and time step 0.01s. Simulation results can be seen in table 1:
TABLE 1 simulation results
By implementing the steps S101-S105, the requirements of simulation analysis of the turbine module in the supercritical carbon dioxide Brayton cycle power generation system can be met. In addition, the flow ratio and the rotation speed ratio obtained by dimensionless method can be normalized. In addition, the outlet pressure value of the control body model obtained through calculation can be more accurate. In addition, the control body parameters obtained by the method can be more diversified.
Having described the method of exemplary embodiments of the present application, next, a modeling apparatus for a supercritical carbon dioxide turbine model of exemplary embodiments of the present application will be described with reference to fig. 7, which may include: a determination unit 701, a first construction unit 702, a second construction unit 703, a third construction unit 704 and a coupling unit 705, wherein,
the determining unit 701 may be configured to determine a topology of the supercritical carbon dioxide turbine model; the topological structure comprises a control body model, an inlet connection pipe model, an outlet connection pipe model, a fluid interface and a mechanical interface;
the first construction unit 702 may be configured to construct the inlet nozzle model based on a flow ratio-pressure ratio characteristic curve; wherein the inlet tap model is configured to determine an outlet pressure value of the control body model based on a fluid input parameter and the flow ratio-to-pressure ratio characteristic; the fluid input parameters are obtained through the fluid interface;
The second construction unit 703 may be configured to construct the control volume model based on the flow ratio-efficiency characteristic curve, the energy conservation equation, and the mass conservation equation; wherein the control body model is configured to determine an operating parameter of the control body model based on a mechanical input parameter, the fluid input parameter, the flow ratio-efficiency characteristic, the energy conservation equation, and the mass conservation equation; the mechanical input parameters are obtained through the mechanical interface;
a third building unit 704 may be configured to build the outlet nozzle model based on a conservation of momentum equation; wherein the outlet takeover model is configured to determine an outlet flow rate of the control body model based on the fluid input parameter, the operating parameter, and the conservation of momentum equation;
the coupling unit 705 may be configured to couple the control body model, the inlet tap model, the outlet tap model, the fluid interface, and the mechanical interface with the topology to obtain the supercritical carbon dioxide turbine model.
In this embodiment, the fluid input parameters include at least an inlet pressure value, an inlet temperature, an inlet flow, an inlet specific enthalpy, an inlet specific entropy, and inlet medium composition information. The mechanical input parameters include at least shaft speed, shaft power, shaft torque, and shaft moment of inertia.
As an alternative embodiment, the determining unit 701 may be further configured to:
dimensionless treatment is carried out on the inlet flow obtained by the fluid interface, and the flow ratio is determined;
and carrying out dimensionless treatment on the shaft rotating speed acquired by the mechanical interface, and determining a rotating speed ratio.
Optionally, the determining unit 701 performs dimensionless on the inlet flow acquired by the fluid interface, and a manner of determining a flow ratio may specifically be:
acquiring a preset rated flow;
determining a ratio between the inlet flow rate and the rated flow rate as a flow rate ratio;
and, the determining unit 701 performs dimensionless on the shaft rotation speed acquired by the mechanical interface, and the manner of determining the rotation speed ratio may specifically be:
acquiring a preset rated rotation speed;
a ratio between the shaft rotational speed and the rated rotational speed is determined as a rotational speed ratio.
In the embodiment, the inlet flow and the shaft rotating speed can be dimensionless, so that the influence caused by the difference of the dimensions between the inlet flow and the shaft rotating speed is eliminated, and the flow ratio and the rotating speed ratio obtained by dimensionless are more normalized.
As an alternative embodiment, the process of determining the outlet pressure value of the control body model by the inlet nipple model based on the fluid input parameter and the flow ratio-pressure ratio characteristic curve may comprise the steps of:
Determining a turbine pressure ratio corresponding to the flow ratio based on the flow ratio-pressure ratio characteristic;
and calculating the fluid input parameter and the turbine pressure ratio, and determining an outlet pressure value of the control body model.
According to the embodiment, the turbine pressure ratio corresponding to the flow ratio can be determined through the inlet connection pipe model by utilizing the flow ratio-pressure ratio characteristic curve, and then the obtained fluid input parameter and the turbine pressure ratio can be calculated to obtain the outlet pressure value of the control body model, so that the calculated outlet pressure value of the control body model is more accurate.
As an alternative embodiment, the process for determining the operating parameters of the control body model based on the mechanical input parameters, the fluid input parameters, the flow ratio-efficiency characteristic, the conservation of energy equation, and the conservation of mass equation comprises the steps of:
determining turbine efficiency corresponding to the speed ratio based on the flow ratio-efficiency characteristic;
based on the inlet specific entropy and the outlet pressure value, calculating to obtain isentropic specific enthalpy;
calculating to obtain outlet specific enthalpy based on the inlet specific enthalpy, the isentropic specific enthalpy and the turbine efficiency;
Calculating to obtain an outlet temperature based on the outlet specific enthalpy and the outlet pressure value;
calculating the turbine efficiency, the inlet specific enthalpy and the isentropic specific enthalpy based on the energy conservation equation and the mass conservation equation, and determining the specific energy of the control body model;
the turbine efficiency, the outlet temperature and the specific energy content are determined as operating parameters of the control body model.
In the implementation of the embodiment, the turbine efficiency corresponding to the rotation speed ratio can be determined by the control body model through the flow ratio-efficiency characteristic curve, and then the operation parameters of a plurality of control body models can be obtained through calculation based on the turbine efficiency and a plurality of parameters obtained from the fluid input parameters, so that the obtained control body parameters are more diversified.
The embodiment of the application can meet the requirements of simulation analysis of the turbine module in the supercritical carbon dioxide Brayton cycle power generation system. In addition, the flow ratio and the rotation speed ratio obtained by dimensionless method can be normalized. In addition, the outlet pressure value of the control body model obtained through calculation can be more accurate. In addition, the control body parameters obtained by the method can be more diversified.
Having described the methods and apparatus of exemplary embodiments of the present application, reference is next made to FIG. 8 for a description of a computer readable storage medium of exemplary embodiments of the present application, and reference is made to FIG. 8 which shows a computer readable storage medium as an optical disk 80 having a computer program (i.e., a program product) stored thereon that, when executed by a processor, performs the steps described in the above method embodiments, for example, determining a topology of the supercritical carbon dioxide turbine model; the topological structure comprises a control body model, an inlet connection pipe model, an outlet connection pipe model, a fluid interface and a mechanical interface; constructing the inlet connection pipe model based on a flow ratio-pressure ratio characteristic curve; the inlet connection pipe model is used for obtaining an outlet pressure value of the control body model based on a fluid input parameter and the flow ratio-pressure ratio characteristic curve; the fluid input parameters are obtained through the fluid interface; constructing the control body model based on a flow ratio-efficiency characteristic curve, an energy conservation equation and a mass conservation equation; the control body model is used for obtaining operation parameters of the control body model based on mechanical input parameters, the fluid input parameters, the flow ratio-efficiency characteristic curve, the energy conservation equation and the mass conservation equation; the mechanical input parameters are obtained through the mechanical interface; constructing the outlet takeover model based on a momentum conservation equation; wherein the outlet nozzle model is used for obtaining the outlet flow rate of the control body model based on the fluid input parameter, the operation parameter and the momentum conservation equation; coupling the control body model, the inlet nozzle model, the outlet nozzle model, the fluid interface and the mechanical interface based on the topology structure to obtain the supercritical carbon dioxide turbine model; the specific implementation of each step is not repeated here.
It should be noted that examples of the computer readable storage medium may also include, but are not limited to, a phase change memory (PRAM), a Static Random Access Memory (SRAM), a Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a flash memory, or other optical or magnetic storage medium, which will not be described in detail herein.
Having described the methods, apparatus, and media of exemplary embodiments of the present application, next, a computing device for model processing of exemplary embodiments of the present application is described with reference to fig. 9.
Fig. 9 illustrates a block diagram of an exemplary computing device 90 suitable for use in implementing embodiments of the present application, the computing device 90 may be a computer system or a server. The computing device 90 shown in fig. 9 is merely an example and should not be taken as limiting the functionality and scope of use of embodiments of the present application.
As shown in fig. 9, components of computing device 90 may include, but are not limited to: one or more processors or processing units 901, a system memory 902, a bus 903 that connects the various system components (including the system memory 902 and the processing units 901).
Computing device 90 typically includes a variety of computer system readable media. Such media can be any available media that is accessible by computing device 90 and includes both volatile and nonvolatile media, removable and non-removable media.
The system memory 902 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 9021 and/or cache memory 9022. Computing device 90 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, ROM9023 may be used to read from or write to non-removable, nonvolatile magnetic media (not shown in FIG. 9, commonly referred to as a "hard disk drive"). Although not shown in fig. 9, a magnetic disk drive for reading from and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading from or writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media), may be provided. In these cases, each drive may be connected to a bus 903 that connects the different system components through one or more data media interfaces. The system memory 902 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of the embodiments of the present application.
A program/utility 9025 having a set (at least one) of program modules 9024 may be stored, for example, in system memory 902, and such program modules 9024 include, but are not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules 9024 generally perform the functions and/or methods in the embodiments described herein.
The computing device 90 may also communicate with one or more external devices 904 (e.g., keyboard, pointing device, display, etc.). Such communication may occur through an input/output (I/O) interface 905. Moreover, the computing device 90 may also communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN) and/or a public network, such as the Internet, through the network adapter 906. As shown in fig. 9, the network adapter 906 communicates with other modules of the computing device 90 (e.g., processing unit 901, etc.) over a bus 903 that connects different system components. It should be appreciated that although not shown in fig. 9, other hardware and/or software modules may be used in connection with computing device 90.
The processing unit 901 performs various functional applications and data processing by running a program stored in the system memory 902, for example, determining the topology of the supercritical carbon dioxide turbine model; the topological structure comprises a control body model, an inlet connection pipe model, an outlet connection pipe model, a fluid interface and a mechanical interface; constructing the inlet connection pipe model based on a flow ratio-pressure ratio characteristic curve; the inlet connection pipe model is used for obtaining an outlet pressure value of the control body model based on a fluid input parameter and the flow ratio-pressure ratio characteristic curve; the fluid input parameters are obtained through the fluid interface; constructing the control body model based on a flow ratio-efficiency characteristic curve, an energy conservation equation and a mass conservation equation; the control body model is used for obtaining operation parameters of the control body model based on mechanical input parameters, the fluid input parameters, the flow ratio-efficiency characteristic curve, the energy conservation equation and the mass conservation equation; the mechanical input parameters are obtained through the mechanical interface; constructing the outlet takeover model based on a momentum conservation equation; wherein the outlet nozzle model is used for obtaining the outlet flow rate of the control body model based on the fluid input parameter, the operation parameter and the momentum conservation equation; and coupling the control body model, the inlet connection pipe model, the outlet connection pipe model, the fluid interface and the mechanical interface based on the topological structure to obtain the supercritical carbon dioxide turbine model. The specific implementation of each step is not repeated here. It should be noted that while in the above detailed description, several units/modules or sub-units/sub-modules of a modeling apparatus of a supercritical carbon dioxide turbine model are mentioned, such a division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more units/modules described above may be embodied in one unit/module according to embodiments of the present application. Conversely, the features and functions of one unit/module described above may be further divided into ones that are embodied by a plurality of units/modules.
In the description of the present application, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the foregoing examples are merely specific embodiments of the present application, and are not intended to limit the scope of the present application, but the present application is not limited thereto, and those skilled in the art will appreciate that while the foregoing examples are described in detail, the present application is not limited thereto. Any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the technical scope of the disclosure of the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Furthermore, although the operations of the methods of the present application are depicted in the drawings in a particular order, this is not required to or suggested that these operations must be performed in this particular order or that all of the illustrated operations must be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform.
Claims (6)
1. A method of modeling a supercritical carbon dioxide turbine model, the method comprising:
determining the topology of the supercritical carbon dioxide turbine model; the topological structure comprises a control body model, an inlet connection pipe model, an outlet connection pipe model, a fluid interface and a mechanical interface;
constructing the inlet connection pipe model based on a flow ratio-pressure ratio characteristic curve; wherein the inlet tap model is configured to determine an outlet pressure value of the control body model based on a fluid input parameter and the flow ratio-to-pressure ratio characteristic; the fluid input parameters are obtained through the fluid interface; the fluid input parameters at least comprise inlet pressure value, inlet temperature, inlet flow, inlet specific enthalpy, inlet specific entropy and inlet medium component information;
constructing the control body model based on a flow ratio-efficiency characteristic curve, an energy conservation equation and a mass conservation equation; wherein the control body model is configured to determine an operating parameter of the control body model based on a mechanical input parameter, the fluid input parameter, the flow ratio-efficiency characteristic, the energy conservation equation, and the mass conservation equation; the mechanical input parameters are obtained through the mechanical interface; the mechanical input parameters at least comprise shaft rotation speed, shaft power, shaft torque and shaft rotational inertia;
The inlet flow obtained by the fluid interface is dimensionless, the flow ratio is determined, the shaft rotating speed obtained by the mechanical interface is dimensionless, and the rotating speed ratio is determined;
constructing the outlet takeover model based on a momentum conservation equation; wherein the outlet takeover model is configured to determine an outlet flow rate of the control body model based on the fluid input parameter, the operating parameter, and the conservation of momentum equation;
and coupling the control body model, the inlet connection pipe model, the outlet connection pipe model, the fluid interface and the mechanical interface by the topological structure to obtain the supercritical carbon dioxide turbine model.
2. The method of modeling a supercritical carbon dioxide turbine model according to claim 1, wherein said non-dimensionalizing said inlet flow obtained by said fluid interface to determine a flow ratio comprises:
acquiring a preset rated flow;
determining a ratio between the inlet flow rate and the rated flow rate as a flow rate ratio;
and said dimensionless determination of said shaft rotational speed obtained by said mechanical interface, determining a rotational speed ratio, comprising:
Acquiring a preset rated rotation speed;
a ratio between the shaft rotational speed and the rated rotational speed is determined as a rotational speed ratio.
3. The method of modeling a supercritical carbon dioxide turbine model according to claim 1 or 2, wherein the process of determining the outlet pressure value of the control body model based on the fluid input parameter and the flow ratio-to-pressure ratio characteristic curve by the inlet nozzle model comprises the steps of:
determining a turbine pressure ratio corresponding to the flow ratio based on the flow ratio-pressure ratio characteristic;
and calculating the fluid input parameter and the turbine pressure ratio, and determining an outlet pressure value of the control body model.
4. The method of modeling a supercritical carbon dioxide turbine model according to claim 1 or 2, wherein the process for determining the operating parameters of the control body model based on the mechanical input parameters, the fluid input parameters, the flow ratio-efficiency characteristic curve, the energy conservation equation, and the mass conservation equation comprises the steps of:
determining turbine efficiency corresponding to the speed ratio based on the flow ratio-efficiency characteristic;
based on the inlet specific entropy and the outlet pressure value, calculating to obtain isentropic specific enthalpy;
Calculating to obtain outlet specific enthalpy based on the inlet specific enthalpy, the isentropic specific enthalpy and the turbine efficiency;
calculating to obtain an outlet temperature based on the outlet specific enthalpy and the outlet pressure value;
calculating the turbine efficiency, the inlet specific enthalpy and the isentropic specific enthalpy based on the energy conservation equation and the mass conservation equation, and determining the specific energy of the control body model;
the turbine efficiency, the outlet temperature and the specific energy content are determined as operating parameters of the control body model.
5. A modeling apparatus for a supercritical carbon dioxide turbine model, the apparatus comprising:
the determining unit is used for determining the topological structure of the supercritical carbon dioxide turbine model; the topological structure comprises a control body model, an inlet connection pipe model, an outlet connection pipe model, a fluid interface and a mechanical interface;
a first construction unit for constructing the inlet nipple model based on a flow ratio-pressure ratio characteristic curve; wherein the inlet tap model is configured to determine an outlet pressure value of the control body model based on a fluid input parameter and the flow ratio-to-pressure ratio characteristic; the fluid input parameters are obtained through the fluid interface; the fluid input parameters at least comprise inlet pressure value, inlet temperature, inlet flow, inlet specific enthalpy, inlet specific entropy and inlet medium component information;
The second construction unit is used for constructing the control body model based on the flow ratio-efficiency characteristic curve, the energy conservation equation and the mass conservation equation; wherein the control body model is configured to determine an operating parameter of the control body model based on a mechanical input parameter, the fluid input parameter, the flow ratio-efficiency characteristic, the energy conservation equation, and the mass conservation equation; the mechanical input parameters are obtained through the mechanical interface; the mechanical input parameters at least comprise shaft rotation speed, shaft power, shaft torque and shaft rotational inertia;
a third construction unit for constructing the outlet takeover model based on a momentum conservation equation; wherein the outlet takeover model is configured to determine an outlet flow rate of the control body model based on the fluid input parameter, the operating parameter, and the conservation of momentum equation;
the coupling unit is used for coupling the control body model, the inlet connection pipe model, the outlet connection pipe model, the fluid interface and the mechanical interface by the topological structure to obtain the supercritical carbon dioxide turbine model;
the determining unit is further used for carrying out dimensionless on the inlet flow acquired by the fluid interface, determining a flow ratio, carrying out dimensionless on the shaft rotating speed acquired by the mechanical interface, and determining a rotating speed ratio.
6. A computing device, the computing device comprising:
at least one processor, memory, and input output unit;
wherein the memory is configured to store a computer program, and the processor is configured to invoke the computer program stored in the memory to perform the method of any of claims 1-4.
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