Coupling calculation method, device and equipment for liquid fuel atomization combustion and medium

Abstract

The invention discloses a coupling calculation method, device and equipment for liquid fuel atomization combustion and a medium, which are applied to the field of liquid fuel atomization combustion, and the coupling calculation method for liquid fuel atomization combustion comprises the following steps: according to the boundary area mean value of two sides of an unstructured grid unit and the area of the unstructured grid unit, calculating the area of the unstructured grid unit; performing equivalent processing on the length of the unstructured grid unit to obtain the equivalent length of the unstructured grid unit; determining a gas phase volume fraction and a component mass fraction during atomization combustion of the liquid fuel through a gas-liquid two-phase flow equation set; according to the gas phase volume fraction and the equivalent length, the liquid evaporation rate in the liquid fuel atomization combustion process is determined; and determining the combustion rate in the atomization combustion process of the liquid fuel according to the mass fractions of the components. According to the method, the liquid fuel atomization combustion process can be accurately solved.

Description

Technical Field

[0001] The invention relates to the field of atomization combustion of liquid fuel, and in particular to a coupling calculation method, device, equipment and medium for atomization combustion of liquid fuel. Background Art

[0002] The atomization combustion of liquid fuel is a common form of combustion in liquid power devices such as rockets, airplanes, and automobiles, including many complex physical sub-processes such as fuel flow, fragmentation, atomization, evaporation, mixing, and combustion. Since these sub-processes are widely distributed in time and space and are coupled to each other, how to comprehensively and accurately solve this coupled process has become a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0003] The purpose of the present invention is to provide a coupled calculation method, device, equipment and medium for liquid fuel atomization combustion, so as to accurately solve the liquid fuel atomization combustion process.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention first provides a coupled calculation method for liquid fuel atomization combustion, comprising:

[0006] According to the average value of the boundary areas on both sides of the unstructured grid unit and the area of ​​the unstructured grid unit, the length of the unstructured grid unit is equivalently processed to obtain the equivalent length of the unstructured grid unit;

[0007] The gas phase volume fraction and component mass fraction during atomization combustion of liquid fuel are determined by the gas-liquid two-phase flow equations.

[0008] The liquid evaporation rate during the atomization combustion of the liquid fuel is determined according to the gas phase volume fraction and the equivalent length; and the combustion rate during the atomization combustion of the liquid fuel is determined according to the component mass fraction.

[0009] In an optional implementation manner of the present application, performing equivalent processing on the length of the unstructured grid unit according to the average of the boundary areas on both sides of the unstructured grid unit and the area of ​​the unstructured grid unit to obtain the equivalent length of the unstructured grid unit includes:

[0010] Determine a grid coefficient of the ith unstructured grid unit according to an average of boundary areas on both sides of the ith unstructured grid unit and the area of ​​the ith unstructured grid unit;

[0011] The equivalent length of the i-th unstructured grid unit is determined according to the grid coefficient, the area of ​​the i-th unstructured grid unit and the average value of the boundary areas on both sides of the i-th unstructured grid unit.

[0012] In an optional implementation of the present application, the equivalent length of the unstructured grid unit is determined by the following formula:

[0013]

[0014]

[0015]

[0016] Among them, δ′ (i，x) is the equivalent length of the i-th unstructured grid unit in the x direction; is the mean boundary area on both sides of the i-th unstructured grid unit in the x direction; s is the grid coefficient; δ′ (i，x) is the equivalent length of the i-th unstructured grid cell in the x direction; ρ is the density of the unstructured grid cell; V is the volume of the unstructured grid cell; n represents the dimension of the unstructured grid cell.

[0017] In an optional embodiment of the present application, the gas phase volume fraction and the component mass fraction are determined by the following formula group:

[0018]

[0019] Among them, Y j is the mass fraction of the jth component in the gas phase; α g is the gas phase volume fraction; ρ is the density of the unstructured grid unit; μ is the velocity; is the divergence symbol; a and b are parameters determined by the critical pressure and critical temperature; R is the gas constant; T is the temperature; P is the pressure; V0 is the volume of the unstructured grid unit; t represents time.

[0020] In an optional embodiment of the present application, determining the liquid evaporation rate during the atomization combustion of the liquid fuel according to the gas phase volume fraction and the equivalent length of the unstructured grid unit includes:

[0021] The liquid evaporation rate during the atomization combustion of the liquid pigment is determined according to the equivalent length of the non-structured grid unit, the temperature between adjacent non-structured grid units and the gas phase volume fraction.

[0022] In an optional embodiment of the present application, the liquid evaporation rate is determined by the following formula:

[0023]

[0024] Among them, h' i Indicates the liquid evaporation rate; λ' eff,(i±1,int) is the equivalent thermal conductivity; T i±1is the i±1th unstructured grid unit; T s is the saturation temperature of the unstructured grid unit; α (g,i+1) and α (g,i-1) represents the gas volume fraction of the i±1th unstructured grid unit; δ' i,x) is the equivalent length of the i-th unstructured grid element in the x direction.

[0025] Compared with the prior art, the coupled calculation method for liquid fuel atomization combustion provided by the present invention reduces the requirements for the grid in the calculation of the atomization process triggered by the vof by performing equivalent processing on the length of the unstructured grid, which is conducive to the construction of the continuous liquid phase evaporation source term on the unstructured grid, so that the unstructured grid unit can be applied in engineering calculations, and at the same time, the gas phase volume fraction and component mass fraction during the atomization combustion of the liquid fuel determined by the gas-liquid two-phase flow equation group are combined to further determine the liquid evaporation rate and the combustion rate, thereby realizing the coupled calculation of the atomization combustion of the liquid fuel.

[0026] The present invention also provides a coupled calculation device for liquid fuel atomization combustion, comprising:

[0027] An equivalent unit, performing equivalent processing on the length of the unstructured grid unit according to the average of the boundary areas on both sides of the unstructured grid unit and the area of ​​the unstructured grid unit, to obtain an equivalent length of the unstructured grid unit;

[0028] Determine the unit, and determine the gas phase volume fraction and component mass fraction during atomization combustion of liquid fuel through the gas-liquid two-phase flow equations;

[0029] The calculation unit determines the liquid evaporation rate during the liquid fuel atomization combustion process according to the gas phase volume fraction and the equivalent length; and determines the combustion rate during the liquid fuel atomization combustion process according to the component mass fraction.

[0030] Compared with the prior art, the beneficial effects of the coupled calculation device for liquid fuel atomization combustion provided by the present invention are the same as the beneficial effects of the coupled calculation method for liquid fuel atomization combustion described in the above technical solution, which will not be elaborated here.

[0031] The present invention also provides an electronic device, comprising:

[0032] processor;

[0033] a memory for storing instructions executable by the processor;

[0034] The processor is used to execute the above-mentioned coupled calculation method for liquid fuel atomization combustion by running the instructions in the memory.

[0035] Compared with the prior art, the beneficial effects of the electronic device provided by the present invention are the same as the beneficial effects of the coupled calculation method for liquid fuel atomization combustion described in the above technical solution, and will not be described in detail here.

[0036] The present invention also provides a computer storage medium, in which instructions are stored. When the instructions are executed, the coupled calculation method for atomization combustion of liquid fuel is implemented.

[0037] Compared with the prior art, the beneficial effects of the computer storage medium provided by the present invention are the same as the beneficial effects of the coupled calculation method for liquid fuel atomization combustion described in the above technical solution, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0039] Figure 1 A flow chart of a coupled calculation method for liquid fuel atomization combustion provided in an embodiment of the present application;

[0040] Figure 2 A structural diagram of a coupled computing device for liquid fuel atomization combustion provided in an embodiment of the present application;

[0041] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to clearly describe the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, words such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and effects. For example, the first threshold and the second threshold are only used to distinguish different thresholds, and their order is not limited. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit them to be different.

[0043] It should be noted that, in the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0044] In the present invention, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b and c, where a, b, c can be single or multiple.

[0045] The atomization combustion of liquid fuel is a common form of combustion in liquid power devices such as rockets, airplanes, and automobiles, including many complex physical sub-processes such as fuel flow, fragmentation, atomization, evaporation, mixing, and combustion. Since these sub-processes are widely distributed in time and space and are coupled to each other, how to comprehensively and accurately solve this coupled process has become a technical problem that technicians in this field need to solve urgently.

[0046] Most of the existing atomization combustion calculations are decoupled, that is, the liquid fuel breakup atomization process and the droplet evaporation combustion process are calculated separately. The atomization calculation usually uses methods such as vof or level set to directly solve the entire process of the liquid jet from the liquid column to the droplet, thereby providing the liquid mist inlet conditions for the combustion calculation. The combustion calculation uses the liquid mist inlet conditions to calculate the droplet from evaporation to the fuel vapor mixed combustion process, and the dpm method is usually used to capture the droplet movement. There are two main reasons for this consideration: one is physical, the jet breakup atomization distance is short, and the evaporation of the jet liquid column is relatively small, and the connection between atomization and combustion is relatively weak; the second is economic, the decoupling process can simplify the calculation, the atomization calculation does not need to consider evaporation, and the droplets in the combustion calculation are considered as point particles, which greatly reduces the calculation cost.

[0047] However, both of these considerations are worth discussing. First of all, ignoring the physical coupling between atomization and combustion itself has many unreasonable aspects. The atomization and combustion in the following scenarios are physically highly coupled: 1. The drastic changes in chamber pressure before and after ignition during engine startup will greatly affect the atomization effect; 2. The atomization effect is closely related to combustion instability, and combustion instability may in turn affect the atomization effect.

[0048] However, there are many unreasonable aspects in the simplifications made in the calculations for the sake of economy: 1. The point particle model assumes that the droplet size is very small and does not occupy volume. This assumption is unreasonable for the case of poor atomization effect; 2. The evaporation of the liquid film attached to the wall is of great importance to the wall cooling, which is difficult to handle with the point particle model.

[0049] Existing technology can also couple the calculation of atomized combustion by using the vof+dpm+combustion method, that is, combining the two coupled calculations. However, this method also has some problems: 1. The selection of the liquid phase volume of the point particle depends on Jiangyan and has a great impact on the calculation structure; 2. The point particle assumption itself has limitations, and the accuracy of flow calculations in dense droplet areas needs to be improved; 3. The evaporation source terms all come from point particles, and the rationality of ignoring continuous liquid phase evaporation needs to be discussed. In short, this method is relatively burdensome to implement, requires more empirical models, and its accuracy and engineering practicality need to be studied.

[0050] In addition, the existing technology can also be directly calculated by adopting the vof+combustion method, that is, the point particle assumption is removed, and the liquid fuel from liquid jet to liquid film, liquid filament, droplet, droplet evaporation and combustion all adopt a continuous fluid model. The advantage of this treatment is that some empirical means in the vof+dpm process are eliminated, and the calculation is directly triggered from the basic principles of multiphase reaction flow, which can comprehensively and accurately reflect the liquid mist combustion process.

[0051] But this will also bring many problems: 1. Calculating the atomization process directly from the vof has high requirements on the grid; 2. Accurate, independent of experience, continuous liquid phase evaporation source terms are difficult to construct on unstructured grids, while unstructured grids are widely used in engineering calculations; 3. Detailed combustion mechanism calculations are also very expensive.

[0052] Based on the above technical status, the present application provides a coupled calculation method, device, equipment and medium for liquid fuel atomization combustion, which are described in detail one by one in the following embodiments.

[0053] The present application embodiment first provides a coupled calculation method for liquid fuel atomization combustion, please refer to Figure 1 , Figure 1 A coupled calculation method for liquid fuel atomization combustion provided in an embodiment of the present application.

[0054] like Figure 1 As shown, the coupled calculation method for liquid fuel atomization combustion includes the following S101 to S103:

[0055] S101, performing equivalent processing on the length of the unstructured grid unit according to the average value of the boundary areas on both sides of the unstructured grid unit and the area of ​​the unstructured grid unit to obtain the equivalent length of the unstructured grid unit.

[0056] In order to adapt to complex flow structures in engineering, it is often necessary to use unstructured grids for calculations, which requires the phase change model to be applicable to unstructured grids. In addition, in order to reduce the amount of computational grids, it is necessary to combine adaptive grid strategies, which requires that a phase change model with high accuracy can be constructed under any complex grid. Since the side length of unstructured grids is difficult to define, it is difficult to construct source terms using the difference method on the Cartesian grid, so the characteristic length method is used for approximate processing.

[0057] Specifically, the above S101 includes:

[0058] The grid coefficient of the non-structured grid unit is determined according to the average value of the boundary areas on both sides of the non-structured grid unit and the grid unit area; the equivalent length of the non-structured grid unit is determined according to the grid coefficient, the grid unit area and the average value of the boundary areas on both sides of the non-structured grid unit.

[0059] The equivalent length of the unstructured grid unit can be expressed by the following formulas (1) to (3):

[0060]

[0061]

[0062]

[0063] Among them, δ' i,x) is the equivalent length of the i-th unstructured grid unit in the x direction; is the average boundary area on both sides of the i-th unstructured grid unit in the x direction; s is the grid coefficient; δ' i,x) is the equivalent length of the i-th unstructured grid cell in the x direction; ρ is the density of the unstructured grid cell; V is the volume of the unstructured grid cell; n represents the dimension of the unstructured grid cell.

[0064] Grid factor is the mean boundary area on both sides of the y direction of the i-th unstructured grid unit; is the average boundary area on both sides of the i-th unstructured grid unit in the z direction.

[0065] S102, determining the gas phase volume fraction and component mass fraction during atomization combustion of the liquid fuel through a gas-liquid two-phase flow equation group.

[0066] The gas-liquid two-phase flow equations use the phase volume fraction α to represent the volume fraction occupied by the gas phase or liquid phase in an unstructured grid unit. Therefore, according to the mass conservation law, the mass conservation equation of each phase can be expressed by the following formula (4):

[0067]

[0068] Where ρ is the density of the unstructured grid unit; α is the phase volume fraction; t is the time; μ is the velocity; is the divergence symbol.

[0069] When considering phase change, it is necessary to add the phase change mass source term to the right side of the above formula (4): The gas phase composition equation can be further written as:

[0070]

[0071] Among them, Y j is the mass fraction of the jth component in the gas phase; α g is the gas phase volume fraction.

[0072] Furthermore, if gas phase reaction is considered, it is necessary to add the phase change mass source term to the right side of the above formula (4): It is also assumed that the gas and liquid phases share a velocity field and temperature field.

[0073] The gas adopts the real gas (van der Waals gas) state equation, as shown in the following formula (6):

[0074]

[0075] Among them, a and b are parameters determined by critical pressure and critical temperature; R is the gas constant; T is the temperature; P is the pressure; V0 is the volume of the unstructured grid unit.

[0076] Furthermore, the gas phase volume fraction α during atomization combustion of liquid fuel can be obtained by the equation group composed of the above formulas (5) and (6): g and component mass fraction Y j .

[0077] S103, determining the liquid evaporation rate during the atomization combustion of the liquid fuel according to the gas phase volume fraction and the equivalent length, and determining the combustion rate during the atomization combustion of the liquid fuel according to the component mass fraction.

[0078] Wherein, determining the liquid evaporation rate during the atomization combustion of the liquid fuel according to the gas phase volume fraction and the equivalent length of the unstructured grid unit includes:

[0079] The liquid evaporation rate during the atomization combustion of the liquid pigment is determined according to the equivalent length of the non-structured grid unit, the temperature between adjacent non-structured grid units and the gas phase volume fraction.

[0080] In practical applications, it is assumed that the phase interface is saturated, and the partial pressure of the liquid phase vapor at the phase interface is the saturation pressure at that location, and the corresponding temperature is the saturation temperature. If there is a supercooled gas (gas below the saturation temperature) in an unstructured grid unit, and there is a pure liquid in the adjacent unstructured grid unit, condensation occurs at the unstructured grid unit; if there is a superheated liquid (liquid above the saturation temperature) in an unstructured grid unit, and there is a pure gas in the adjacent unstructured grid unit, evaporation occurs at the unstructured grid unit.

[0081] Specifically, the liquid evaporation rate can be expressed by the following formula (7):

[0082]

[0083] in, Indicates the liquid evaporation rate; λ' eff,(i±1,int) is the equivalent thermal conductivity; T i±1 is the i±1th unstructured grid unit; T s is the saturation temperature of the unstructured grid unit; α (g,i+1) and α (g,i-1) represents the gas volume fraction of the i±1th unstructured grid unit; δ' i,x) is the equivalent length of the i-th unstructured grid element in the x direction.

[0084] After the evaporation rate is calculated by the above method, the combustion rate during the atomization combustion of the liquid fuel can be further determined in combination with the mass fraction of the components. Specifically, a simplified mechanism can be used to calculate the combustion rate by the Arrhenius equation. Calculating the combustion rate by the Arrhenius equation is a conventional technical means for those skilled in the art and will not be described in detail here.

[0085] It can be understood that the coupled calculation method of the liquid fuel atomization combustion provided above solves the evaporation rate and combustion rate of a time step. In the actual application process, it is necessary to calculate the evaporation rate and combustion rate of each time step in the entire simulation experiment, and then determine the dynamic process of the liquid fuel atomization combustion over a long period of time.

[0086] In summary, the coupled calculation method for liquid fuel atomization combustion provided in the embodiment of the present application reduces the requirements for the grid in the calculation of the atomization process triggered by the vof by equivalently processing the length of the unstructured grid, which is conducive to the construction of continuous liquid phase evaporation source items on the unstructured grid, so that the unstructured grid unit can be applied in engineering calculations. At the same time, the gas phase volume fraction and component mass fraction during the atomization combustion of the liquid fuel determined by the gas-liquid two-phase flow equation group are combined to determine the liquid evaporation rate and the combustion rate, thereby realizing the coupled calculation of the atomization combustion of the liquid fuel.

[0087] The present application also provides a coupled computing device for liquid fuel atomization combustion, please refer to Figure 2 , Figure 2 A structural diagram of a coupled computing device for liquid fuel atomization combustion provided in an embodiment of the present application.

[0088] like Figure 2 As shown, the coupled calculation device for liquid fuel atomization combustion comprises:

[0089] An equivalent unit 201 performs equivalent processing on the length of the unstructured grid unit according to the average value of the boundary areas on both sides of the unstructured grid unit and the area of ​​the unstructured grid unit to obtain an equivalent length of the unstructured grid unit;

[0090] The determination unit 202 determines the gas phase volume fraction and component mass fraction during atomization combustion of the liquid fuel through a gas-liquid two-phase flow equation group;

[0091] The calculation unit 203 determines the liquid evaporation rate during the liquid fuel atomization combustion process according to the gas phase volume fraction and the equivalent length; and determines the combustion rate during the liquid fuel atomization combustion process according to the component mass fraction.

[0092] In an optional implementation manner of the present application, performing equivalent processing on the length of the unstructured grid unit according to the average of the boundary areas on both sides of the unstructured grid unit and the area of ​​the unstructured grid unit to obtain the equivalent length of the unstructured grid unit includes:

[0093] Determine a grid coefficient of the ith unstructured grid unit according to an average of boundary areas on both sides of the ith unstructured grid unit and the area of ​​the ith unstructured grid unit;

[0094] The equivalent length of the i-th unstructured grid unit is determined according to the grid coefficient, the area of ​​the i-th unstructured grid unit and the average value of the boundary areas on both sides of the i-th unstructured grid unit.

[0095] In an optional implementation of the present application, the equivalent length of the unstructured grid unit is determined by the following formula:

[0096]

[0097]

[0098]

[0099] Among them, δ' (i,x) is the equivalent length of the i-th unstructured grid unit in the x direction; is the average boundary area on both sides of the i-th unstructured grid unit in the x direction; s is the grid coefficient; δ' (i,x) is the equivalent length of the i-th unstructured grid cell in the x direction; ρ is the density of the unstructured grid cell; V is the volume of the unstructured grid cell; n represents the dimension of the unstructured grid cell.

[0100] In an optional embodiment of the present application, the gas phase volume fraction and the component mass fraction are determined by the following formula group:

[0101]

[0102] Among them, Y j is the mass fraction of the jth component in the gas phase; α g is the gas phase volume fraction; ρ is the density of the unstructured grid unit; μ is the velocity; is the divergence symbol; a and b are parameters determined by the critical pressure and critical temperature; R is the gas constant; T is the temperature; P is the pressure; V0 is the volume of the unstructured grid unit; t represents time.

[0103] In an optional embodiment of the present application, determining the liquid evaporation rate during the atomization combustion of the liquid fuel according to the gas phase volume fraction and the equivalent length of the unstructured grid unit includes:

[0104] The liquid evaporation rate during the atomization combustion of the liquid pigment is determined according to the equivalent length of the non-structured grid unit, the temperature between adjacent non-structured grid units and the gas phase volume fraction.

[0105] In an optional embodiment of the present application, the liquid evaporation rate is determined by the following formula:

[0106]

[0107] Among them, h' i Indicates the liquid evaporation rate; λ' eff,(i±1,int) is the equivalent thermal conductivity; T i±1 is the i±1th unstructured grid unit; T s is the saturation temperature of the unstructured grid unit; α (g,i+1) and α (g,i-1) represents the gas volume fraction of the i±1th unstructured grid unit; δ' (i,x) is the equivalent length of the i-th unstructured grid element in the x direction.

[0108] The above-mentioned device embodiment provided in this embodiment belongs to the same application concept as the method embodiment of this application, and can execute the coupled calculation method for atomization combustion of liquid fuel provided in any of the above-mentioned embodiments of this application, and has the corresponding functional modules and beneficial effects for executing the coupled calculation method for atomization combustion of liquid fuel. For the technical details not fully described in this embodiment, please refer to the specific processing content of the coupled calculation method for atomization combustion of liquid fuel provided in the above-mentioned embodiments of this application, which will not be repeated here.

[0109] It should be understood that the units in the above devices can be implemented in the form of a processor calling software. For example, the device includes a processor, the processor is connected to a memory, and instructions are stored in the memory. The processor calls the instructions stored in the memory to implement any of the above methods or realize the functions of each unit of the device, wherein the processor can be a general-purpose processor, such as a CPU or a microprocessor, etc., and the memory can be a memory in the device or a memory outside the device. Alternatively, the units in the device can be implemented in the form of hardware circuits, and the functions of some or all units can be realized by designing the hardware circuits. The hardware circuit can be understood as one or more processors; for example, in one implementation, the hardware circuit is an ASIC, and the functions of some or all of the above units are realized by designing the logical relationship of the components in the circuit; for another example, in another implementation, the hardware circuit can be implemented by PLD, taking FPGA as an example, which can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by the configuration file, so as to realize the functions of some or all of the above units. All units of the above devices can be implemented in the form of a processor calling software, or in the form of hardware circuits, or in part by a processor calling software, and the remaining part is implemented in the form of hardware circuits.

[0110] In an embodiment of the present application, a processor is a circuit with the ability to process signals. In one implementation, the processor may be a circuit with the ability to read and run instructions, such as a CPU, a microprocessor, a GPU, or a DSP; in another implementation, the processor may implement certain functions through the logical relationship of a hardware circuit, and the logical relationship of the hardware circuit is fixed or reconfigurable, such as a hardware circuit implemented by an ASIC or PLD, such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document to implement the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as an NPU, TPU, DPU, etc.

[0111] It can be seen that each unit in the above device can be one or more processors (or processing circuits) configured to implement the above method, such as: CPU, GPU, NPU, TPU, DPU, microprocessor, DSP, ASIC, FPGA, or a combination of at least two of these processor forms.

[0112] In addition, all or part of the units in the above device can be integrated together, or can be implemented independently. In one implementation, these units are integrated together and implemented in the form of a SOC. The SOC may include at least one processor for implementing any of the above methods or implementing the functions of each unit of the device. The type of the at least one processor may be different, for example, including a CPU and an FPGA, a CPU and an artificial intelligence processor, a CPU and a GPU, etc.

[0113] The present application also provides an electronic device, such as Figure 3 As shown, Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0114] like Figure 3 As shown, the electronic device comprises:

[0115] Processor 210;

[0116] A memory 200 for storing instructions executable by the processor 210;

[0117] The processor 210 is used to execute the coupled calculation method for liquid fuel atomization combustion disclosed in any of the above embodiments by running the instructions in the memory 200.

[0118] The processor 210, the memory 200, the communication interface 220, the input device 230 and the output device 240 are connected to each other via a bus.

[0119] A bus may include a pathway that transfers information between components of a computer system.

[0120] The processor 210 may be a general-purpose processor, such as a general-purpose central processing unit (CPU), a microprocessor, etc., or an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the scheme of the present invention. It may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0121] The processor 210 may include a main processor, and may also include a baseband chip, a modem, and the like.

[0122] The memory 200 stores a program for executing the technical solution of the present invention, and may also store an operating system and other key services. Specifically, the program may include a program code, and the program code includes a computer operation instruction. More specifically, the memory 200 may include a read-only memory (ROM), other types of static storage devices that can store static information and instructions, a random access memory (RAM), other types of dynamic storage devices that can store information and instructions, a disk storage, a flash, and the like.

[0123] The input device 230 may include a device for receiving data and information input by a user, such as a keyboard, a mouse, a camera, a scanner, a touch screen, etc.

[0124] Output device 240 may include devices that allow information to be output to a user, such as a display screen, printer, speaker, etc.

[0125] The communication interface 220 may include any device such as a transceiver to communicate with other devices or communication networks, such as Ethernet, a radio access network (RAN), a wireless local area network (WLAN), etc.

[0126] The processor 210 executes the program stored in the memory 200 and calls other devices, and can be used to implement each step of the coupled calculation method for liquid fuel atomization combustion provided in any of the above embodiments of the present application.

[0127] In addition to the above-mentioned methods and devices, embodiments of the present application may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps in the coupled calculation method for liquid fuel atomization combustion of various embodiments of the present application.

[0128] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0129] In addition, the embodiments of the present application may also be a storage medium on which a computer program is stored, and the computer program is executed by a processor to execute the steps in the coupled calculation method for liquid fuel atomization combustion of various embodiments of the present application.

[0130] For the aforementioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the order of the actions described, because according to the present application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0131] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0132] The steps in the methods of each embodiment of the present application can be adjusted in order, combined and deleted according to actual needs, and the technical features recorded in each embodiment can be replaced or combined.

[0133] The modules and sub-modules in the devices and terminals in the various embodiments of the present application can be combined, divided and deleted according to actual needs.

[0134] In the several embodiments provided in the present application, it should be understood that the disclosed terminals, devices and methods can be implemented in other ways. For example, the terminal embodiments described above are only schematic, for example, the division of modules or submodules is only a logical function division, and there may be other division methods in actual implementation, for example, multiple submodules or modules can be combined or integrated into another module, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0135] The modules or submodules described as separate components may or may not be physically separated, and the components of the modules or submodules may or may not be physical modules or submodules, that is, they may be located in one place, or they may be distributed on multiple network modules or submodules. Some or all of the modules or submodules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0136] In addition, each functional module or submodule in each embodiment of the present application may be integrated into one processing module, or each module or submodule may exist physically separately, or two or more modules or submodules may be integrated into one module. The above-mentioned integrated modules or submodules may be implemented in the form of hardware or in the form of software functional modules or submodules.

[0137] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0138] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly by hardware, software units executed by a processor, or a combination of the two. The software units may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0139] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0140] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coupled calculation method for liquid fuel atomization combustion, characterized in that: include: According to the average value of the boundary areas on both sides of the unstructured grid unit and the area of ​​the unstructured grid unit, the length of the unstructured grid unit is equivalently processed to obtain the equivalent length of the unstructured grid unit; The gas phase volume fraction and component mass fraction during atomization combustion of liquid fuel are determined by the gas-liquid two-phase flow equations. The liquid evaporation rate during the atomization combustion of the liquid fuel is determined according to the gas phase volume fraction and the equivalent length; and the combustion rate during the atomization combustion of the liquid fuel is determined according to the component mass fraction.

2. The method according to claim 1, characterized in that The step of performing equivalent processing on the length of the non-structured grid unit according to the average value of the boundary areas on both sides of the non-structured grid unit and the area of ​​the non-structured grid unit to obtain the equivalent length of the non-structured grid unit includes: Determine a grid coefficient of the ith unstructured grid unit according to an average of boundary areas on both sides of the ith unstructured grid unit and the area of ​​the ith unstructured grid unit; The equivalent length of the i-th unstructured grid unit is determined according to the grid coefficient, the area of ​​the i-th unstructured grid unit and the average value of the boundary areas on both sides of the i-th unstructured grid unit.

3. The method according to claim 1 or 2, characterized in that: The equivalent length of the unstructured grid unit is determined by the following formula: Among them, δ' i,x) is the equivalent length of the i-th unstructured grid unit in the x direction; is the average boundary area on both sides of the i-th unstructured grid unit in the x direction; s is the grid coefficient; δ' i,x) is the equivalent length of the i-th unstructured grid cell in the x direction; ρ is the density of the unstructured grid cell; V is the volume of the unstructured grid cell; n represents the dimension of the unstructured grid cell.

4. The method according to claim 1, characterized in that The gas phase volume fraction and the component mass fraction are determined by the following formula group: Among them, Y j is the mass fraction of the jth component in the gas phase; α g is the gas phase volume fraction; ρ is the density of the unstructured grid unit; μ is the velocity; is the divergence symbol; a and b are parameters determined by the critical pressure and critical temperature; R is the gas constant; T is the temperature; P is the pressure; V0 is the volume of the unstructured grid unit; t represents time.

5. The method according to claim 1, characterized in that The method of determining the liquid evaporation rate during the atomization combustion of the liquid fuel according to the gas phase volume fraction and the equivalent length of the unstructured grid unit comprises: The liquid evaporation rate during the atomization combustion of the liquid pigment is determined according to the equivalent length of the non-structured grid unit, the temperature between adjacent non-structured grid units and the gas phase volume fraction.

6. The method according to claim 1 or 5, characterized in that: The liquid evaporation rate is determined by the following formula: in, Indicates the liquid evaporation rate; λ' eff,(i±1,int) is the equivalent thermal conductivity; T i±1 is the i±1th unstructured grid unit; T s is the saturation temperature of the unstructured grid unit; α (g,i+1) and α (g,i-1) represents the gas volume fraction of the i±1th unstructured grid unit; δ' i,x) is the equivalent length of the i-th unstructured grid element in the x direction.

7. A coupled calculation device for liquid fuel atomization combustion, characterized in that: include: An equivalent unit, performing equivalent processing on the length of the unstructured grid unit according to the average of the boundary areas on both sides of the unstructured grid unit and the area of ​​the unstructured grid unit, to obtain an equivalent length of the unstructured grid unit; Determine the unit, and determine the gas phase volume fraction and component mass fraction during atomization combustion of liquid fuel through the gas-liquid two-phase flow equations; The calculation unit determines the liquid evaporation rate during the liquid fuel atomization combustion process according to the gas phase volume fraction and the equivalent length; and determines the combustion rate during the liquid fuel atomization combustion process according to the component mass fraction.

8. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is used to execute the coupled calculation method for liquid fuel atomization combustion as described in any one of claims 1 to 6 by running the instructions in the memory.

9. A computer storage medium, characterized in that The computer storage medium stores instructions, and when the instructions are executed, the coupled calculation method for liquid fuel atomization combustion according to any one of claims 1 to 6 is implemented.

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