Gas thermodynamic analysis method, system, equipment and medium for hydrogen energy automobile power device

Abstract

The invention relates to a gas thermodynamic analysis method, system and equipment for a hydrogen energy automobile power device and a medium. The method comprises the following steps: S1, describing behaviors of high-pressure hydrogen gas in the hydrogen energy automobile power device by adopting an R-K real gas state equation; s2, dividing a system into a fixed-volume opening system, a variable-volume opening system and a variable-volume closed system according to whether a thermodynamic system to which high-pressure gas in the hydrogen energy automobile power device belongs exchanges substances and energy with the outside or not and whether the volume is fixed or not; s3, thermodynamic models of the three systems under the adiabatic condition and the convective heat transfer condition are calculated respectively; and S4, obtaining the temperature distribution rule of the high-pressure gas in the hydrogen energy automobile power device through the thermodynamic model under the adiabatic condition and the convective heat transfer condition, and completing the thermodynamic analysis of the high-pressure gas in the hydrogen energy automobile power device. Compared with the prior art, the thermodynamic analysis precision of the high-pressure gas in the hydrogen energy automobile power device is improved, and the application range is expanded.

Description

Technical Field

[0001] The present invention relates to the field of new energy electric vehicle power devices, and in particular to a gas thermodynamic analysis method, system, equipment and medium for hydrogen energy vehicle power devices. Background Art

[0002] Hydrogen is a bridge between renewable energy and traditional fossil energy. Through hydrogen energy and fuel cells, the vision of clean energy utilization in the future can be realized. Developing "hydrogen energy and fuel cell technology innovation" has become an inevitable requirement for the energy technology revolution. Since hydrogen in hydrogen energy vehicle power units often exists in high pressure form, the temperature change of high pressure hydrogen will directly affect the cruising range of hydrogen energy vehicles and the operating efficiency of hydrogen refueling stations. In order to ensure the safety and efficiency of hydrogen energy vehicle operation, it is of great significance to analyze the temperature distribution law of high pressure gas in hydrogen energy vehicle power units and study the thermodynamic mechanism of high pressure gas in hydrogen energy vehicle power units.

[0003] There is a big gap between the state of high-pressure gas described by the ideal gas state equation and the actual situation. In 1910, Van der Waals won the Nobel Prize for the Van der Waals equation that describes the real gas state. In 1948, Redlich and Kwong made corrections based on the Van der Waals equation and obtained the RK real gas state equation with high accuracy in describing pressure and temperature. Since then, many scholars have also made corrections to the real gas state equation, but the RK real gas state equation has been more widely used because it retains the simple form of the volumetric cubic equation. Some scholars have applied the real gas state equation to the thermodynamic analysis of high-pressure gas systems. Based on the Abel-Noble form of the gas state equation, WS Inters et al. analyzed the temperature change law of high-pressure gas during the leakage process for the high-pressure helium storage system by combining theory and experiment. (Winters WS, Evans GH, Rice SF, et al. An experimental and theoretical study of heat and mass transfer during the venting of gas from pressure vessels [J]. International journal of heat and mass transfer, 2012, 55 (1-3): 8-18.) Daniele Melideo et al. chose to use the RK real gas state equation to describe the high-pressure compressibility effect of gas, and used the CFD method to analyze the temperature rise of the high-pressure gas system during the fast filling process. (Melideo D, Baraldi D, Galassi MC, et al. CFD model performance benchmark of fast filling simulations of hydrogen tanks with pre-cooling [J]. International journal of hydrogen energy, 2014, 39 (9): 4389-4395.) Considering the convective heat transfer process of the high-pressure gas system, R. Grief et al. integrated the empirical formula for heat calculation and obtained a mathematical model of the heat transfer process during gas compression in a piston pneumatic system.(Greif R, Namba T, Nikanham M. Heat transfer during piston compression including side wall and convection effects [J]. International Journal of Heat and Mass Transfer, 1979, 22 (6): 901-907.) Bourgeois T et al. proposed that the heat transfer between the gas and the wall in the high-pressure container will significantly affect the change of the internal temperature of the gas. They constructed a thermodynamic heat transfer model of an open high-pressure container through the real gas state equation, and developed a set of OD models based on soft sensors for real-time monitoring of the temperature of high-pressure gas. Bourgeois T, Ammouri F, Weber M, et al. Evaluating the temperature inside a tank during a filling with highly-pressurized gas [J]. international journal of hydrogen energy, 2015, 40 (35): 11748-11755.).

[0004] However, the existing thermodynamic analysis of high-pressure gas in hydrogen-powered vehicle power plants has not yet established a complete thermodynamic theoretical analysis model through the RK real gas state equation with high accuracy and simple form, especially for different thermodynamic systems to which the high-pressure gas in the hydrogen-powered vehicle power plant belongs. The thermodynamic model under adiabatic and convective heat transfer conditions has not been established according to different working conditions to analyze the temperature distribution law of the high-pressure gas in the hydrogen-powered vehicle power plant. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide an accurate and reliable gas thermodynamic analysis method, system, equipment and medium for hydrogen automobile power plant.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to a first aspect of the present invention, there is provided a gas thermodynamic analysis method for a hydrogen automobile power plant, the method comprising the following steps:

[0008] S1. Use the RK real gas state equation to describe the behavior of high-pressure hydrogen gas in the hydrogen vehicle power unit;

[0009] S2. According to whether the thermodynamic system to which the high-pressure gas in the hydrogen-powered vehicle power device belongs has material and energy exchange with the outside world and whether the volume is fixed, the thermodynamic system to which the high-pressure gas in the hydrogen-powered vehicle power device belongs is divided into a fixed volume open system, a variable volume open system and a variable volume closed system;

[0010] S3, respectively calculating the thermodynamic models of a fixed volume open system, a variable volume open system and a variable volume closed system under adiabatic conditions and the thermodynamic models of a fixed volume open system, a variable volume open system and a variable volume closed system under convective heat transfer conditions;

[0011] S4. Through the thermodynamic model under the adiabatic condition and convective heat transfer condition calculated in S3, the temperature distribution law of the high-pressure gas in the hydrogen-powered vehicle power unit is obtained, and the thermodynamic analysis of the high-pressure gas in the hydrogen-powered vehicle power unit is completed.

[0012] Preferably, the thermodynamic model of the fixed volume opening system under adiabatic conditions is described as:

[0013]

[0014] Among them, T fixed is the gas temperature in the fixed volume open system; m fixed is the gas mass in the fixed volume opening system; c Vfixed is the constant volume specific heat capacity of the gas in the fixed volume opening system; c V∞ is the constant volume specific heat capacity of the gas source; T ∞ is the gas temperature of the gas source; m ∞ is the gas mass of the gas source; R is the gas constant; V is the fixed volume of the system; M is the molar mass of the gas; a and b are the RK constants of the gas.

[0015] Preferably, the thermodynamic model of the variable volume opening system under adiabatic conditions is described as:

[0016]

[0017] Among them, T variable is the gas temperature in the variable volume opening system; t is the time variable; m variable is the gas mass in the variable volume opening system; c Vvariable V is the constant volume specific heat capacity of the gas in the variable volume opening system; variable is the volume of gas in the variable volume opening system; c V∞ is the constant volume specific heat capacity of the gas source; T ∞ is the gas temperature of the gas source; M is the gas molar mass; R is the gas constant; a and b are the RK constants of the gas; ρ ∞ is the gas density of the gas source.

[0018] Preferably, the thermodynamic model of the variable volume closed system under adiabatic conditions is described as:

[0019]

[0020] Among them, T closed is the gas temperature in the variable volume closed system; t is the time variable; m closed is the gas mass in the variable volume closed system; c Vclosed V is the constant volume specific heat capacity of the gas in the variable volume closed system; closed is the volume of gas in a variable volume closed system; R is the gas constant; V is the fixed volume of the system; M is the molar mass of the gas; a and b are the RK constants of the gas.

[0021] Preferably, the thermodynamic model of the fixed volume opening system under convection heat transfer conditions is described as:

[0022]

[0023] Among them, A fixed_in is the inner wall surface area of ​​the fixed volume opening system; t is the time variable; α fixed_in is the heat exchange coefficient between the inner wall of the fixed volume opening system and the high pressure gas; T fixed_w is the wall temperature of the fixed volume opening system; c V∞ is the constant volume specific heat capacity of the gas source; T ∞ is the gas temperature of the gas source; m ∞ is the gas mass of the gas source; R is the gas constant; V is the fixed volume of the system; M is the molar mass of the gas; a and b are the RK constants of the gas.

[0024] Preferably, the thermodynamic model of the variable volume opening system under convection heat transfer conditions is described as:

[0025]

[0026] Among them, A variable_in is the inner wall surface area of ​​the variable volume opening system; t is the time variable; α variable_in is the heat exchange coefficient between the inner wall of the variable volume opening system and the high pressure gas; T variable_w is the wall temperature of the variable volume opening system; c V∞ is the constant volume specific heat capacity of the gas source; T ∞ is the gas temperature of the gas source; m ∞ is the gas mass of the gas source; R is the gas constant; V is the fixed volume of the system; M is the molar mass of the gas; a and b are the RK constants of the gas.

[0027] Preferably, the thermodynamic model of the variable volume closed system under convection heat transfer conditions is described as:

[0028]

[0029] Among them, A closed_in is the inner wall surface area of ​​the variable volume closed system; t is the time variable; α closed_in is the heat exchange coefficient between the inner wall of the variable volume closed system and the high pressure gas; T closed_w is the wall temperature of the variable volume closed system; R is the gas constant; V is the fixed volume of the system; M is the molar mass of the gas; a and b are the RK constants of the gas.

[0030] According to a second aspect of the present invention, there is provided a system using the gas thermodynamic analysis method for a hydrogen automobile power plant, the system comprising:

[0031] A preprocessing module for describing the behavior of high-pressure hydrogen gas in a hydrogen vehicle power unit using the RK real gas state equation;

[0032] A judgment module is used to classify the thermodynamic system to which the high-pressure gas in the hydrogen-powered vehicle power device belongs into a fixed-volume open system, a variable-volume open system, and a variable-volume closed system according to whether the thermodynamic system to which the high-pressure gas in the hydrogen-powered vehicle power device belongs has material and energy exchange with the outside world and whether the volume is fixed;

[0033] Thermodynamic model building module, which calculates the thermodynamic models of fixed volume open system, variable volume open system and variable volume closed system under adiabatic conditions and the thermodynamic models of fixed volume open system, variable volume open system and variable volume closed system under convective heat transfer conditions;

[0034] The comprehensive thermodynamics module is used to obtain the temperature distribution law of high-pressure gas in the hydrogen-powered vehicle power unit through thermodynamic models under adiabatic conditions and convective heat transfer conditions, and complete the thermodynamic analysis of high-pressure gas in the hydrogen-powered vehicle power unit.

[0035] According to a second aspect of the present invention, there is provided an electronic device, comprising a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the program, any one of the methods described above is implemented.

[0036] According to a third aspect of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, wherein when the program is executed by a processor, any one of the methods described above is implemented.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] (1) The present invention takes into account that the hydrogen in the hydrogen-powered vehicle power device often exists in a high-pressure form, the distance between high-pressure gas molecules is small, and the gravitational and repulsive forces are obvious. The RK real gas state equation is used to describe the behavior of the high-pressure hydrogen gas in the hydrogen-powered vehicle power device. Compared with the process analyzed using the ideal gas state equation, it is more accurate and reliable.

[0039] (2) The present invention takes into account the different thermodynamic systems to which the high-pressure gas in the hydrogen-powered automobile power unit belongs, and analyzes three different operating conditions: a fixed volume opening system, a variable volume opening system, and a variable volume closed system. This can cover most of the high-pressure gas systems in the hydrogen-powered automobile power unit to meet the needs of different structural devices.

[0040] (3) The present invention comprehensively considers the different materials used in different power units of hydrogen-powered vehicles, provides a thermodynamic model under adiabatic conditions for materials with good thermal insulation properties, and further provides a thermodynamic model under convective heat transfer conditions for materials with good thermal conductivity, which helps engineers select appropriate materials and design strategies to meet the needs of specific applications.

[0041] (4) The present invention provides a gas thermodynamic analysis method for a hydrogen-powered automobile power unit, which can effectively predict the distribution law of the gas temperature in the unit and the convective heat transfer process of the gas, and provides a theoretical basis and technical support for improving the energy utilization efficiency of the hydrogen-powered automobile power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a flow chart of a gas thermodynamic analysis method for a hydrogen automobile power plant in a specific embodiment;

[0043] Figure 2 It is a schematic diagram of a model of a fixed volume opening system under adiabatic conditions in a specific embodiment;

[0044] Figure 3 It is a schematic diagram of a model of a variable volume opening system under adiabatic conditions in a specific embodiment;

[0045] Figure 4 It is a schematic diagram of a model of a variable volume closed system under adiabatic conditions in a specific embodiment;

[0046] Figure 5 It is a schematic diagram of a model of a fixed volume opening system under convection heat transfer conditions in a specific embodiment;

[0047] Figure 6 It is a schematic diagram of a model of a variable volume opening system under convection heat transfer conditions in a specific embodiment;

[0048] Figure 7 It is a schematic diagram of a model of a variable volume closed system under convective heat transfer conditions in a specific embodiment;

[0049] Figure 8 The temperature distribution law of the fixed volume opening system, the variable volume opening system and the variable volume closed system under the convection heat transfer condition in the specific embodiment. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0051] Example

[0052] like Figure 1 As shown, the present invention provides a gas thermodynamic analysis method for a hydrogen automobile power device, comprising the following steps:

[0053] S1. Use the RK real gas state equation to describe the behavior of high-pressure hydrogen gas in the hydrogen vehicle power unit;

[0054] S2. According to whether the thermodynamic system to which the high-pressure gas in the hydrogen-powered vehicle power device belongs has material and energy exchange with the outside world and whether the volume is fixed, the thermodynamic system to which the high-pressure gas in the hydrogen-powered vehicle power device belongs is divided into a fixed volume open system, a variable volume open system and a variable volume closed system;

[0055] S3, respectively calculating the thermodynamic models of a fixed volume open system, a variable volume open system and a variable volume closed system under adiabatic conditions and the thermodynamic models of a fixed volume open system, a variable volume open system and a variable volume closed system under convective heat transfer conditions;

[0056] S4. Through the thermodynamic model under the adiabatic condition and convective heat transfer condition calculated in S3, the temperature distribution law of the high-pressure gas in the hydrogen-powered vehicle power unit is obtained, and the thermodynamic analysis of the high-pressure gas in the hydrogen-powered vehicle power unit is completed.

[0057] It is understandable that the present invention does not limit the structure of the high pressure gas system in the hydrogen automobile power device, and the present application can be used to analyze the required high pressure gas system. In this embodiment, 10 MPa or more is defined as high pressure gas.

[0058] For the sake of convenience, in this embodiment, Figure 2 , Figure 3 , Figure 4 The solutions of the present invention are described with reference to a fixed volume opening system, a variable volume opening system and a variable volume closed system.

[0059] A hydrogen car power unit refers to a system that uses hydrogen as fuel to generate electricity through a chemical reaction in a fuel cell, thereby driving the car.

[0060] In hydrogen-powered vehicle power units, hydrogen often exists in a high-pressure form, and the distance between high-pressure gas molecules is small, so the attraction and repulsion are obvious. The RK real gas state equation can more accurately describe the behavior of high-pressure hydrogen gas in hydrogen-powered vehicle power units.

[0061] As a thermodynamic research object, the high-pressure hydrogen in the hydrogen-powered vehicle power unit belongs to a high-pressure gas system. According to the different material and energy exchanges between the system and the outside world, the system is divided into an isolated system, a closed system, and an open system. Since the isolated system is relatively rare in the hydrogen-powered vehicle power unit, it is ignored. The high-pressure gas system in the hydrogen-powered vehicle power unit studied includes an open system and a closed system.

[0062] An open system refers to a system that can exchange energy and matter with the outside world; a closed system refers to a system that can only exchange energy with the outside world, and does not allow or has no matter exchange.

[0063] The opening system in the hydrogen vehicle power unit is divided into a fixed volume opening system and a variable volume opening system according to whether the volume is fixed. The closed system in the hydrogen vehicle power unit often exists in the form of variable volume.

[0064] Therefore, the three operating conditions of the high-pressure gas system in the hydrogen vehicle power unit include: fixed volume opening system, variable volume opening system and variable volume closed system.

[0065] When the thermal insulation performance of the boundary material of the high-pressure gas system in the hydrogen-powered vehicle power unit is good, the internal gas hardly exchanges heat with the outside world. Figure 2 As shown, the thermodynamic model of a fixed volume opening system under adiabatic conditions can be described as:

[0066]

[0067] Among them, T fixed is the gas temperature in the fixed volume open system; m fixed is the gas mass in the fixed volume opening system; c Vfixed is the constant volume specific heat capacity of the gas in the fixed volume opening system; c V∞ is the constant volume specific heat capacity of the gas source; T ∞ is the gas temperature of the gas source; m ∞ is the gas mass of the gas source; R is the gas constant; V is the fixed volume of the system; M is the molar mass of the gas; a and b are the RK constants of the gas.

[0068] like Figure 3As shown, the thermodynamic model of the variable volume opening system under adiabatic conditions can be described as:

[0069]

[0070] Among them, T variable is the gas temperature in the variable volume opening system; m variable is the gas mass in the variable volume opening system; c Vvariable V is the constant volume specific heat capacity of the gas in the variable volume opening system; variable is the volume of gas in the variable volume opening system; ρ ∞ is the gas density of the gas source.

[0071] like Figure 4 As shown, the thermodynamic model of a variable volume closed system under adiabatic conditions can be described as:

[0072]

[0073] Among them, T closed is the gas temperature in the variable volume closed system; m closed is the gas mass in the variable volume closed system; c Vclosed V is the constant volume specific heat capacity of the gas in the variable volume closed system; closed is the volume of gas in a variable volume closed system.

[0074] The boundary material of the high-pressure gas system in the hydrogen-powered vehicle power unit has good thermal conductivity, and the internal gas will have a significant heat exchange effect with the outside world, such as Figure 5 As shown in the figure, the thermodynamic model of the fixed volume opening system under convective heat transfer conditions can be described as:

[0075]

[0076] Among them, A fixed_in is the inner wall surface area of ​​the fixed volume opening system; α fixed_in is the heat exchange coefficient between the inner wall of the fixed volume opening system and the high pressure gas; T fixed_w is the wall temperature of the fixed volume opening system.

[0077] like Figure 6 As shown in the figure, the thermodynamic model of the variable volume opening system under convective heat transfer conditions can be described as:

[0078]

[0079] Among them, A variable_in is the inner wall surface area of ​​the variable volume opening system; α variable_in is the heat exchange coefficient between the inner wall of the variable volume opening system and the high pressure gas; T variable_wis the wall temperature of the variable volume opening system.

[0080] like Figure 7 As shown in the figure, the thermodynamic model of a variable volume closed system under convective heat transfer conditions can be described as:

[0081]

[0082] Among them, A closed_in is the inner wall surface area of ​​the variable volume closed system; α closed_in is the heat exchange coefficient between the inner wall of the variable volume closed system and the high pressure gas; T closed_w is the wall temperature of the variable volume closed system.

[0083] like Figure 2-Figure 7 The thermodynamic models of the three working conditions under adiabatic conditions and convective heat transfer conditions can obtain the temperature distribution law of the high-pressure gas in the hydrogen-powered vehicle power unit and complete the thermodynamic analysis of the high-pressure gas in the hydrogen-powered vehicle power unit.

[0084] In the actual hydrogen refueling process of hydrogen energy vehicles, the high-pressure hydrogen storage system needs to face the problems of hydrogen fast charging temperature rise, supply stability, and precise control of temperature and pressure. Especially under extreme pressure conditions, factors such as gas heat transfer and flow characteristics will change significantly. Studying the thermodynamic behavior of the 70MPa on-board high-pressure hydrogen storage system during the charging process and carrying out temperature calculations of high-pressure gases in hydrogen energy vehicle power units can accurately predict the temperature variation law of the hydrogen storage system and ensure the safety of the vehicle's hydrogen refueling process. According to the above thermodynamic model, a high-pressure gas thermodynamic analysis MATLAB / Simulink platform is built, and the simulation step size, solver, simulation accuracy, etc. are set for calculation. The temperature distribution law of high-pressure gas in the 70MPa hydrogen energy vehicle power unit, such as Figure 8 shown. Figure 8The temperature distribution law of fixed volume opening system (on-board high-pressure hydrogen storage bottle), variable volume opening system (high-pressure cylinder rodless cavity) and variable volume closed system (high-pressure cylinder rod cavity) under convective heat transfer conditions. According to the established thermodynamic model, based on the RK real gas state equation, the temperature distribution law of three working conditions under adiabatic and convective heat transfer conditions is analyzed, the factors affecting the temperature of high-pressure gas in the hydrogen-powered vehicle power device are explored, and a thermodynamic analysis method for high-pressure gas in the hydrogen-powered vehicle power device is formed. In existing engineering applications, due to the limitations of cost, time and computing resources, the fine model of heat transfer thermodynamics is usually ignored, and simplified empirical formulas or linear approximations are used to describe the thermodynamic behavior of gas under high pressure environments. Although this simplification reduces the computational complexity and cost, it may bring large errors in extreme application scenarios such as high-pressure hydrogen, resulting in reduced system safety and efficiency. The present invention takes into account the high-pressure existence form of hydrogen in the hydrogen-powered vehicle power device, and selects the RK real gas state equation to describe the behavior of high-pressure hydrogen gas in the hydrogen-powered vehicle power device, which has higher analysis accuracy. At the same time, the thermodynamic processes of three different working conditions, namely fixed volume opening system, variable volume opening system and variable volume closed system, under adiabatic and convective heat transfer conditions are analyzed to meet the needs of devices with different structures. It can effectively predict the distribution law of gas temperature in the device and the convective heat transfer process of the gas, and provide a theoretical basis and technical support for improving the energy utilization efficiency of hydrogen vehicle power systems.

[0085] The electronic device of the present invention includes a central processing unit (CPU), which can perform various appropriate actions and processes according to computer program instructions stored in a read-only memory (ROM) or loaded from a storage unit into a random access memory (RAM). In the RAM, various programs and data required for device operation can also be stored. The CPU, ROM and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0086] Multiple components in the device are connected to the I / O interface, including: input units, such as keyboards, mice, etc.; output units, such as various types of displays, speakers, etc.; storage units, such as disks, optical disks, etc.; and communication units, such as network cards, modems, wireless communication transceivers, etc. The communication unit allows the device to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunication networks.

[0087] The processing unit performs the various methods and processes described above, such as methods S1 to S4. For example, in some embodiments, methods S1 to S4 may be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit. In some embodiments, part or all of the computer program may be loaded and / or installed on the device via a ROM and / or a communication unit. When the computer program is loaded into the RAM and executed by the CPU, one or more steps of methods S1 to S4 described above may be performed. Alternatively, in other embodiments, the CPU may be configured to execute methods S1 to S4 in any other appropriate manner (e.g., by means of firmware).

[0088] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chip systems (SOCs), load programmable logic devices (CPLDs), and the like.

[0089] The program code for implementing the method of the present invention can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general-purpose computer, a special-purpose computer or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code can be executed entirely on the machine, partially on the machine, partially on the machine as a stand-alone software package and partially on a remote machine, or entirely on a remote machine or server.

[0090] In the context of the present invention, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0091] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A gas thermodynamic analysis method for a hydrogen automobile power plant, characterized in that: The method comprises the following steps: S1. Use the RK real gas state equation to describe the behavior of high-pressure hydrogen gas in the hydrogen vehicle power unit; S2. According to whether the thermodynamic system to which the high-pressure gas in the hydrogen-powered vehicle power device belongs has material and energy exchange with the outside world and whether the volume is fixed, the thermodynamic system to which the high-pressure gas in the hydrogen-powered vehicle power device belongs is divided into a fixed volume open system, a variable volume open system and a variable volume closed system; S3, respectively calculating the thermodynamic models of a fixed volume open system, a variable volume open system and a variable volume closed system under adiabatic conditions and the thermodynamic models of a fixed volume open system, a variable volume open system and a variable volume closed system under convective heat transfer conditions; S4. Through the thermodynamic model under the adiabatic condition and convective heat transfer condition calculated in S3, the temperature distribution law of the high-pressure gas in the hydrogen-powered vehicle power unit is obtained, and the thermodynamic analysis of the high-pressure gas in the hydrogen-powered vehicle power unit is completed.

2. The gas thermodynamic analysis method for a hydrogen automobile power plant according to claim 1, characterized in that: The thermodynamic model of the fixed volume opening system under adiabatic conditions is described as: Among them, T fixed is the gas temperature in the fixed volume open system; m fixed is the gas mass in the fixed volume opening system; c Vfixed is the constant volume specific heat capacity of the gas in the fixed volume opening system; c V∞ is the constant volume specific heat capacity of the gas source; T ∞ is the gas temperature of the gas source; m ∞ is the gas mass of the gas source; R is the gas constant; V is the fixed volume of the system; M is the molar mass of the gas; a and b are the RK constants of the gas.

3. The gas thermodynamic analysis method for a hydrogen automobile power plant according to claim 1, characterized in that: The thermodynamic model of the variable volume opening system under adiabatic conditions is described as: Among them, T variable is the gas temperature in the variable volume opening system; t is the time variable; m variable is the gas mass in the variable volume opening system; c Vvariable V is the constant volume specific heat capacity of the gas in the variable volume opening system; variable is the volume of gas in the variable volume opening system; c V∞ is the constant volume specific heat capacity of the gas source; T ∞ is the gas temperature of the gas source; M is the gas molar mass; R is the gas constant; a and b are the RK constants of the gas; ρ ∞ is the gas density of the gas source.

4. The gas thermodynamic analysis method for a hydrogen automobile power plant according to claim 1, characterized in that: The thermodynamic model of the variable volume closed system under adiabatic conditions is described as: Among them, T closed is the gas temperature in the variable volume closed system; t is the time variable; m closed is the gas mass in the variable volume closed system; c Vclosed V is the constant volume specific heat capacity of the gas in the variable volume closed system; closed is the volume of gas in a variable volume closed system; R is the gas constant; V is the fixed volume of the system; M is the molar mass of the gas; a and b are the RK constants of the gas.

5. The gas thermodynamic analysis method for a hydrogen automobile power plant according to claim 1, characterized in that: The thermodynamic model of the fixed volume opening system under convective heat transfer conditions is described as: Among them, A fixed_in is the inner wall surface area of ​​the fixed volume opening system; t is the time variable; α fixed_in is the heat exchange coefficient between the inner wall of the fixed volume opening system and the high pressure gas; T fixed_w is the wall temperature of the fixed volume opening system; c V∞ is the constant volume specific heat capacity of the gas source; T ∞ is the gas temperature of the gas source; m ∞ is the gas mass of the gas source; R is the gas constant; V is the fixed volume of the system; M is the molar mass of the gas; a and b are the RK constants of the gas.

6. The gas thermodynamic analysis method for a hydrogen automobile power plant according to claim 1, characterized in that: The thermodynamic model of the variable volume opening system under convection heat transfer conditions is described as: Among them, A variable_in is the inner wall surface area of ​​the variable volume opening system; t is the time variable; α variable_in is the heat exchange coefficient between the inner wall of the variable volume opening system and the high pressure gas; T variable_w is the wall temperature of the variable volume opening system; c V∞ is the constant volume specific heat capacity of the gas source; T ∞ is the gas temperature of the gas source; m ∞ is the gas mass of the gas source; R is the gas constant; V is the fixed volume of the system; M is the molar mass of the gas; a and b are the RK constants of the gas.

7. The gas thermodynamic analysis method for a hydrogen automobile power plant according to claim 1, characterized in that: The thermodynamic model of the variable volume closed system under convective heat transfer conditions is described as: Among them, A closed_in is the inner wall surface area of ​​the variable volume closed system; t is the time variable; α closed_in is the heat exchange coefficient between the inner wall of the variable volume closed system and the high pressure gas; T closed_w is the wall temperature of the variable volume closed system; R is the gas constant; V is the fixed volume of the system; M is the molar mass of the gas; a and b are the RK constants of the gas.

8. A system using the gas thermodynamic analysis method for a hydrogen automobile power plant according to claim 1, characterized in that: The system includes: A preprocessing module for describing the behavior of high-pressure hydrogen gas in a hydrogen vehicle power unit using the RK real gas state equation; A judgment module is used to classify the thermodynamic system to which the high-pressure gas in the hydrogen-powered vehicle power device belongs into a fixed-volume open system, a variable-volume open system, and a variable-volume closed system according to whether the thermodynamic system to which the high-pressure gas in the hydrogen-powered vehicle power device belongs has material and energy exchange with the outside world and whether the volume is fixed; Thermodynamic model building module, which calculates the thermodynamic models of fixed volume open system, variable volume open system and variable volume closed system under adiabatic conditions and the thermodynamic models of fixed volume open system, variable volume open system and variable volume closed system under convective heat transfer conditions; The comprehensive thermodynamics module is used to obtain the temperature distribution law of high-pressure gas in the hydrogen-powered vehicle power unit through thermodynamic models under adiabatic conditions and convective heat transfer conditions, and complete the thermodynamic analysis of high-pressure gas in the hydrogen-powered vehicle power unit.

9. An electronic device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the processor executes the program, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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