A fuel thermal management simulation method

Abstract

The application belongs to the field of aero-engine thermal management, and is a fuel thermal management simulation method. A preliminary system flow path diagram is established through the physical logical relationship connection between components, and then the interaction relationship between the components based on the heat and mass transfer process is developed. The complete system flow path diagram is established according to the interaction relationship between the components. The component modeling is carried out according to the characteristics between different components. After the modeling is completed, simulation analysis is carried out, and the simulation system is continuously corrected through the difference analysis with the test data until the set simulation data threshold requirement is reached. From the aspects of problem positioning, system schematic diagram confirmation, component interaction relationship establishment, component characteristic establishment and simulation implementation, a standardized simulation analysis process is established. The component performance and the heat and mass transfer between the components are considered. Through the simulation analysis method based on the component characteristics, high-precision simulation is realized, and the system is simple and the process is standardized.

Description

Technical Field

[0001] This application belongs to the field of aero-engine thermal management, and specifically relates to a fuel thermal management simulation method. Background Technology

[0002] Aero-engine thermal management is one of the key technological features of advanced aero-engines. It utilizes cryogenic air and fuel as primary heat sinks, and through the design of energy and heat transfer, exchange, and utilization processes, it meets the thermal management requirements of the aircraft for the engine and its components / subsystems. Integrated fuel and lubricating oil thermal management is an important aspect of engine thermal management, aiming to cool the engine lubricating oil within a certain inlet fuel temperature limit.

[0003] Fuel thermal management system analysis is a crucial aspect of aircraft and engine thermal management design research. Compared to research on aircraft fuel system thermal management, current research on engine fuel thermal management is relatively limited. This is primarily because the principles and structures of engine fuel system components are extremely complex. Pump-type accessories, while fulfilling their primary function of pressurization, are constrained by control signals and internal fuel return; regulating accessories require precise fuel distribution and metering through differential pressure valves and regulating valves. The complex flow and heat transfer characteristics within and between these components make system analysis extremely difficult.

[0004] Given the severe demands and complexities of fuel thermal management, simulation analysis of fuel thermal management is of paramount importance.

[0005] Currently, most existing simulation analysis methods utilize one-dimensional simulation software such as AMESim, which builds engine fuel thermal management simulation models through the software's built-in thermal library module. The component models mostly adopt software-built-in models or simplified proxy models, which makes the simulation analysis of thermal management systems suffer from drawbacks such as non-standard processes, unsystematic considerations, and large error results.

[0006] Therefore, how to conduct comprehensive and accurate simulation of fuel thermal management systems is a problem that needs to be solved. Summary of the Invention

[0007] The purpose of this application is to provide a fuel thermal management simulation method to solve the problems of complex, difficult to analyze, and large error in engine fuel thermal management.

[0008] The technical solution of this application is: a fuel thermal management simulation method, comprising:

[0009] Obtain the boundary of the fuel thermal management system, determine the heat and mass transfer between the fuel thermal management system and the external environment, determine the working fluid and system components of the fuel thermal management system, and establish a preliminary system flow diagram based on the physical and logical relationships between the components.

[0010] Based on the system flow diagram of the fuel thermal management system, conduct research on the interaction relationships between components in the heat transfer and mass transfer processes, and establish a complete system flow diagram based on the interaction relationships between each component;

[0011] Based on the complete system flow diagram, distinguish between working and non-working components; establish flow-pressure difference and flow-efficiency characteristics for working components; establish flow-pressure characteristics for non-working components; and perform component modeling.

[0012] The boundary of the fuel thermal management system is input into the simulation system. Component modeling is performed for simulation analysis to obtain fuel temperature simulation results. A simulation data threshold is set, and existing corresponding test data is obtained and compared with the fuel temperature simulation results. It is determined whether the difference between the fuel temperature simulation results and the corresponding existing test data exceeds the simulation data threshold. If not, the simulation is complete; otherwise, the interaction relationship analysis is performed again, and iterative simulation calculations are conducted until the difference between the fuel temperature simulation results and the corresponding existing test data is within the simulation data threshold range.

[0013] Preferably, the system components include a fuel booster pump, a main fuel pump, a afterburner fuel pump, an injector fuel pump, a main fuel metering device, a main combustion oil cooler, an afterburner fuel metering device, an afterburner oil cooler, and an afterburner distributor; the fuel booster pump, main fuel pump, main fuel metering device, and main combustion oil cooler form a fuel flow path, inputting fuel into the main combustion chamber; the fuel booster pump, afterburner fuel pump, afterburner fuel metering device, afterburner oil cooler, and afterburner distributor form a second fuel flow path, inputting fuel into the afterburner combustion chamber; the fuel booster pump and the injector fuel pump form a third fuel flow path, inputting fuel into each actuation control device; the main combustion oil cooler and the afterburner oil cooler form a lubricating oil flow path.

[0014] Preferably, the interaction relationship includes functional oil return, control flow path and control signal, wherein the functional oil return includes a first oil return flow path between each actuation control device and the fuel tank, a second oil return flow path between the afterburner distributor and the fuel tank, a third oil return flow path between the afterburner fuel pump and the fuel tank, a fourth oil return flow path between the afterburner fuel metering device and the fuel tank, and a fifth oil return flow path between the main fuel metering device and the fuel tank.

[0015] Preferably, the specific method for modeling and simulating the component is as follows: a first fuel temperature correction is set for the first return oil flow path, a second fuel temperature correction is set for the second return oil flow path, a third fuel temperature correction is set for the third return oil flow path, a fourth fuel temperature correction is set for the fourth return oil flow path, and a fifth fuel temperature correction is set for the fifth return oil flow path. When the fuel booster pump is simulated, the aircraft fuel is superimposed with the first to fifth fuel temperature corrections to obtain the input fuel temperature of the fuel booster pump. Then, the fuel temperature is fed into one fuel circuit, the second fuel circuit, and the third fuel circuit respectively, and superimposed into one lubricating oil circuit for iterative simulation calculation.

[0016] The fuel thermal management simulation method of this application first establishes a preliminary system flow diagram by connecting the physical and logical relationships between various components. Then, it develops a complete system flow diagram based on the interaction relationships between components during heat and mass transfer processes. Next, it models the components according to their characteristics. After modeling, it performs simulation analysis and continuously corrects the simulation system by performing difference analysis with test data until the set simulation data threshold requirements are met. A standardized simulation analysis process is established from aspects such as problem identification, system schematic confirmation, establishment of interaction relationships between components, establishment of component characteristics, and simulation implementation. The system considers the performance of components and the influence of heat and mass transfer between components, achieving high-precision simulation through a simulation analysis method based on component characteristics. Simultaneously, the system is simple and the process is standardized. Attached Figure Description

[0017] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0018] Figure 1 This is a schematic diagram of the overall process of this application;

[0019] Figure 2 A flowchart is established for the preliminary system flow of this application;

[0020] Figure 3 This is a preliminary system flow diagram of the fuel oil thermal management system of this application;

[0021] Figure 4 This is a schematic diagram of the complete system flow path of the fuel oil thermal management system of this application;

[0022] Figure 5 A flowchart is established to illustrate the functional component characteristics of this application;

[0023] Figure 6 This is a schematic diagram of the flow resistance characteristics of the fuel metering and regulating device of this application;

[0024] Figure 7 This is a schematic diagram of the flow-pressure differential characteristics of the fuel booster pump in this application;

[0025] Figure 8 This is a schematic diagram of the flow-efficiency characteristics of the fuel booster pump in this application;

[0026] Figure 9 This is a schematic diagram comparing the test results and simulation calculation results of this application. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] A simulation method for fuel thermal management, such as Figure 1 As shown, it includes the following steps:

[0029] Step S100: Obtain the boundary of the fuel thermal management system, combined with... Figure 2 The heat and mass transfer between the fuel thermal management system and the external environment are determined and considered as boundary conditions for the simulation. The working fluid and system components of the fuel thermal management system are determined. The working fluid includes fuel and lubricating oil. Other working fluids are considered based on whether they affect the flow parameters of the fuel (including temperature, pressure, flow rate, etc.). The system components are analyzed by identifying those components in the flow path that have a significant impact on fuel flow and heat transfer, in order to simplify the system flow path. A preliminary system flow path diagram is established based on the physical and logical relationships between the components.

[0030] Combination Figure 3 The system components include a fuel booster pump, a main fuel pump, a afterburner fuel pump, an injector fuel pump, a main fuel metering device, a main combustion oil cooler, an afterburner fuel metering device, an afterburner fuel oil cooler, and an afterburner distributor. The fuel booster pump, main fuel pump, main fuel metering device, and main combustion oil cooler form a fuel flow path, which is input into the main combustion chamber. The fuel booster pump, afterburner fuel pump, afterburner fuel metering device, afterburner fuel oil cooler, and afterburner distributor form a second fuel flow path, which is input into the afterburner combustion chamber. The fuel booster pump and the injector fuel pump form a third fuel flow path, which is input into each actuation control device. The main combustion oil cooler and the afterburner fuel oil cooler form a lubricating oil flow path.

[0031] Step S200: Based on the system flow diagram of the fuel thermal management system, conduct research on the interaction relationships between components in the heat transfer and mass transfer process, and establish a complete system flow diagram based on the interaction relationships between each component.

[0032] Interactions include functional oil return, control oil circuits, and control signals. The interactions between components not only significantly impact simulation results but also affect the time effects of transient state simulations.

[0033] Preferably, such as Figure 4 As shown, Figure 4 Is Figure 3 Based on this, a more refined and defined flow diagram of the fuel thermal management system was established. Functional fuel return includes the first fuel return flow path between each actuation control device and the fuel tank, the second fuel return flow path between the afterburner distributor and the fuel tank, the third fuel return flow path between the afterburner fuel pump and the fuel tank, the fourth fuel return flow path between the afterburner fuel metering device and the fuel tank, and the fifth fuel return flow path between the main fuel metering device and the fuel tank.

[0034] Step S300, combined Figure 5 Based on the complete system flow diagram, distinguish between working components and non-working components. Establish flow-pressure difference and flow-efficiency characteristics for working components, and flow-pressure characteristics for non-working components. Perform component modeling, and consider the influence of control signals and return oil mixing in step 2 on component characteristics during modeling.

[0035] In simulation analysis, parameters are obtained for a specified characteristic to generate a characteristic curve. Example: Figure 6 It is the fuel thermal management flow path of a certain engine ( Figure 4 The flow resistance characteristics of the main fuel metering and regulating device are those of a non-working component. Figure 7 and Figure 8 It is the fuel thermal management flow path ( Figure 4 The flow-pressure differential and flow-efficiency characteristics of the fuel booster pump, which is a working component in the engine.

[0036] Step S400: Input the boundary of the fuel thermal management system into the simulation system, model the components, perform simulation analysis, and obtain the fuel temperature simulation results; set the simulation data threshold, obtain the existing corresponding test data, and compare it with the fuel temperature simulation results to determine whether the difference between the fuel temperature simulation results and the corresponding existing test data exceeds the simulation data threshold. If not, the simulation is complete; otherwise, the interaction relationship analysis is repeated, and iterative simulation calculations are performed until the difference between the fuel temperature simulation results and the corresponding existing test data is within the simulation data threshold range. Through iterative design, the fuel thermal management system can be continuously corrected and improved, considering both the completeness of influencing factors and the accuracy of the component models.

[0037] Preferably, the specific method for modeling and simulating the component is as follows: a first fuel temperature correction is set for the first return oil flow path, a second fuel temperature correction is set for the second return oil flow path, a third fuel temperature correction is set for the third return oil flow path, a fourth fuel temperature correction is set for the fourth return oil flow path, and a fifth fuel temperature correction is set for the fifth return oil flow path. When the fuel booster pump is simulated, the aircraft fuel is superimposed with the first to fifth fuel temperature corrections to obtain the input fuel temperature of the fuel booster pump. Then, the fuel temperature is fed into one fuel circuit, the second fuel circuit, and the third fuel circuit respectively, and superimposed into one lubricating oil circuit for iterative simulation calculation.

[0038] For the control oil circuit and control signals, the corresponding correction values ​​are set in the same way, thereby simplifying the system and simulating the fuel thermal management system more effectively.

[0039] Example: For Figure 4 For a certain engine's fuel thermal management, complete the modeling according to step 3. Figure 9 The simulation results and test data for fuel temperature at key locations are compared. The results show that the fuel temperature difference at key locations is within 4℃, indicating good simulation accuracy. The simulation results are shown in Table 1.

[0040] Table 1. Simulation and experimental results under typical conditions

[0041]

[0042] This application first establishes a preliminary system flow diagram by connecting the physical and logical relationships between various components. Then, it develops a complete system flow diagram based on the interaction relationships between components during heat and mass transfer processes. Next, it models the components according to their characteristics. After modeling, simulation analysis is performed, and the simulation system is continuously corrected by performing difference analysis with test data until the set simulation data threshold requirements are met. A standardized simulation analysis process is established from aspects such as problem identification, system schematic confirmation, establishment of interaction relationships between components, establishment of component characteristics, and simulation implementation. The system considers component performance and the influence of heat and mass transfer between components, achieving high-precision simulation through a simulation analysis method based on component characteristics. Simultaneously, the system is simple and the process is standardized.

[0043] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0044] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0045] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fuel thermal management simulation method, characterized in that, include: Obtain the boundary of the fuel thermal management system, determine the heat and mass transfer between the fuel thermal management system and the external environment, determine the working fluid and system components of the fuel thermal management system, and establish a preliminary system flow diagram based on the physical and logical relationships between the components. Based on the system flow diagram of the fuel thermal management system, conduct research on the interaction relationships between components in the heat transfer and mass transfer processes, and establish a complete system flow diagram based on the interaction relationships between each component; Based on the complete system flow diagram, distinguish between working components and non-working components, establish flow-pressure difference and flow-efficiency characteristics for working components, and establish flow-pressure characteristics for non-working components; Perform component modeling; The boundary of the fuel thermal management system is input into the simulation system, the components are modeled and simulated to obtain the fuel temperature simulation results; Set a simulation data threshold, obtain existing corresponding test vehicle data, compare and analyze it with the fuel temperature simulation results, and determine whether the difference between the fuel temperature simulation results and the corresponding existing test vehicle data exceeds the simulation data threshold. If not, the simulation is complete; otherwise, the interaction relationship analysis is performed again, and iterative simulation calculations are performed until the difference between the fuel temperature simulation results and the corresponding existing test vehicle data is within the range of the simulation data threshold.

2. The fuel thermal management simulation method as described in claim 1, characterized in that: The system components include a fuel booster pump, a main fuel pump, a afterburner fuel pump, a nozzle fuel pump, a main fuel metering device, a main combustion oil cooler, an afterburner fuel metering device, an afterburner fuel oil cooler, and an afterburner distributor; the fuel booster pump, main fuel pump, main fuel metering device, and main combustion oil cooler form one fuel flow path, which is input into the main combustion chamber; the fuel booster pump, afterburner fuel pump, afterburner fuel metering device, afterburner fuel oil cooler, and afterburner distributor form a second fuel flow path, which is input into the afterburner combustion chamber; The fuel booster pump and the fuel injection pump form a third fuel flow path, which is input into each actuation control device; the main combustion lubricating oil cooler and the afterburner lubricating oil cooler form a lubricating oil flow path.

3. The fuel thermal management simulation method as described in claim 2, characterized in that: The interaction relationship includes functional oil return, control flow path and control signal. The functional oil return includes the first oil return flow path between each actuation control device and the fuel tank, the second oil return flow path between the afterburner distributor and the fuel tank, the third oil return flow path between the afterburner fuel pump and the fuel tank, the fourth oil return flow path between the afterburner fuel metering device and the fuel tank, and the fifth oil return flow path between the main fuel metering device and the fuel tank.

4. The fuel thermal management simulation method as described in claim 3, characterized in that, The specific method for modeling and simulating the components is as follows: a first fuel temperature correction is set for the first return oil flow path, a second fuel temperature correction is set for the second return oil flow path, a third fuel temperature correction is set for the third return oil flow path, a fourth fuel temperature correction is set for the fourth return oil flow path, and a fifth fuel temperature correction is set for the fifth return oil flow path. When the fuel booster pump is simulated, the aircraft fuel is superimposed with the first to fifth fuel temperature corrections to obtain the input fuel temperature of the fuel booster pump. Then, the fuel temperature is fed into one fuel circuit, the second fuel circuit, and the third fuel circuit, respectively, and superimposed into one lubricating oil circuit for iterative simulation calculation.

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