Variable topology fuel oil and lubricating oil self-matching thermal management system of aero-engine

Abstract

The invention discloses an aero-engine variable topology fuel and lubricating oil self-matching thermal management system which comprises a lubricating oil tank, a lubricating oil pump, a fuel and lubricating oil heat exchanger, an air and lubricating oil heat exchanger, a bearing cavity, an oil supply system, a main combustion chamber and an oil return adjusting valve. The fuel lubricating oil heat exchanger, the air lubricating oil heat exchanger, a first stepless adjustable valve, a second stepless adjustable valve, a third stepless adjustable valve, a fourth stepless adjustable valve, a fifth stepless adjustable valve, a sixth stepless adjustable valve, a seventh stepless adjustable valve and an eighth stepless adjustable valve form a lubricating oil variable topology flow path, and the whole body is connected in a shape like a Chinese character'ri '. The fuel lubricating oil heat exchanger, the air lubricating oil heat exchanger, the first stepless adjustable valve, the second stepless adjustable valve, the third stepless adjustable valve, the fourth stepless adjustable valve, the fifth stepless adjustable valve, the sixth stepless adjustable valve, the seventh stepless adjustable valve and the eighth stepless adjustable valve. According to the set regulation and control strategy, in combination with working condition transformation, the fuel oil heat sink and the duct air heat sink are efficiently utilized to take away the thermal load of the system, the heat dissipation requirement of a bearing cavity in a fuel and lubricating oil system is met, different working conditions are recognized, a corresponding optimal thermal management system topological structure is automatically matched in combination with the regulation and control strategy, and the system reliability is improved. The topological structure of the thermal management system of the fuel and lubricating oil system is variable.

Description

Technical Field

[0001] The invention belongs to the field of thermal management of aircraft engines, in particular to a variable fuel and lubricating oil self-matching thermal management system for aircraft engines. Background Art

[0002] As the overall performance of aircraft continues to increase, the flight speed of aircraft is further increased to high Mach numbers. However, at high Mach numbers, the aircraft will face extremely severe aerodynamic heating, which will cause higher thermal loads on the aircraft surface and system components. In addition, the improvement in performance has led to an increase in the number and power of onboard equipment, resulting in a continuous increase in the temperature of the aircraft's internal environment. In this case, the fuel and lubricating oil thermal management system in the aircraft engine thermal management system plays a key role in managing the heat load transfer between the internal systems of the aircraft engine.

[0003] Fuel is the main cooling source of the aircraft engine lubricating oil system. With the improvement of aircraft engine performance, the heat dissipation load borne by fuel is also increasing. Maintaining the fuel temperature at a suitable high temperature can effectively improve the combustion efficiency of the combustion chamber, but too high a fuel temperature will not only reduce the control accuracy and reliability of the engine fuel control system, shorten the service life of the fuel accessories, but also cause the hot return oil flow of the fuel system to be too large, making the fuel tank temperature too high. And too high a fuel temperature can easily lead to fuel coking.

[0004] As aircraft maneuverability improves, the engine will face more flight conditions within the full flight envelope, which also places higher demands on the fuel and lubricant thermal management system. The fixed fuel and lubricant thermal management system topology cannot simultaneously meet the heat exchange requirements under a variety of different operating conditions, or cannot simultaneously achieve efficient use of heat sinks under a variety of operating conditions.

[0005] To this end, a variable topology fuel and lubricant self-matching thermal management system for aircraft engines is needed. When faced with a variety of complex operating conditions, it can self-match the optimal thermal management system topology structure to achieve reasonable distribution of heat sinks within the system under the entire flight envelope of the aircraft, so as to achieve efficient use of heat sinks and reduce the hot return oil flow as much as possible. Summary of the invention

[0006] The purpose of the present invention is to provide an aircraft engine variable topology fuel and lubricating oil self-matching thermal management system, which can automatically match the aircraft engine fuel and lubricating oil system with the optimal topology structure according to changes in operating conditions, realize the function of optimizing heat sink distribution under various operating conditions, and meet the restrictions on fuel and lubricating oil temperatures in the fuel and lubricating oil system.

[0007] The purpose of the present invention is achieved through the following technical solutions: A variable topology fuel and lubricating oil thermal management system for an aeroengine, characterized in that it includes: a lubricating oil tank, a lubricating oil pump, a fuel and lubricating oil heat exchanger, an air and lubricating oil heat exchanger, a bearing chamber, a fuel supply system, a main combustion chamber, a return oil regulating valve, a first stepless adjustable valve, a second stepless adjustable valve, a third stepless adjustable valve, a fourth stepless adjustable valve, a fifth stepless adjustable valve, a sixth stepless adjustable valve, a seventh stepless adjustable valve and an eighth stepless adjustable valve; the lubricating oil tank is connected to the lubricating oil pump, the lubricating oil pump is connected to the air and lubricating oil heat exchanger through the first stepless adjustable valve and connected to the fuel and lubricating oil heat exchanger through the second stepless adjustable valve; the bearing chamber is connected to the fuel and lubricating oil heat exchanger through the seventh stepless adjustable valve and connected to the air and lubricating oil heat exchanger through the eighth stepless adjustable valve; the bearing chamber is connected to the lubricating oil tank; the fuel and lubricating oil heat exchanger is connected to the fuel supply system, the main combustion chamber and the return oil regulating valve; the third stepless adjustable valve and the fifth stepless adjustable valve are connected in series between the second stepless adjustable valve and the eighth stepless adjustable valve; the sixth stepless adjustable valve is connected between the fifth stepless adjustable valve and the seventh stepless adjustable valve; the fourth stepless adjustable valve is connected between the first stepless adjustable valve and the third stepless adjustable valve.

[0008] The fuel and lubricating oil heat exchanger, the air and lubricating oil heat exchanger, and the first stepless adjustable valve, the second stepless adjustable valve, the third stepless adjustable valve, the fourth stepless adjustable valve, the fifth stepless adjustable valve, the sixth stepless adjustable valve, the seventh stepless adjustable valve and the eighth stepless adjustable valve form a variable topology flow path for lubricating oil, which is integrally connected in a "day" shape.

[0009] In the variable topology flow path for lubricating oil, the first stepless adjustable valve, the second stepless adjustable valve, the third stepless adjustable valve and the fourth stepless adjustable valve are grouped as one set, and the fifth stepless adjustable valve, the sixth stepless adjustable valve, the seventh stepless adjustable valve and the eighth stepless adjustable valve are grouped as another set, and are connected in sequence by using four three-ways; the three-way between the fifth stepless adjustable valve and the sixth stepless adjustable valve and the three-way between the third stepless adjustable valve and the fourth stepless adjustable valve are connected by a pipeline to achieve communication between the two valve sets; the three-ways between the fifth stepless adjustable valve and the eighth stepless adjustable valve and between the sixth stepless adjustable valve and the seventh stepless adjustable valve are respectively connected to one side of the air and lubricating oil heat exchanger and the fuel and lubricating oil heat exchanger, and the three-ways between the first stepless adjustable valve and the fourth stepless adjustable valve and between the second stepless adjustable valve and the third stepless adjustable valve are respectively connected to the other side of the air and lubricating oil heat exchanger and the fuel and lubricating oil heat exchanger.

[0010] When the second, fourth, sixth and eighth steplessly adjustable valves in the variable topology flow path are closed and the other steplessly adjustable valves are opened, the air-lubricating oil heat exchanger and the fuel-lubricating oil heat exchanger are in a series topology structure and first pass through the air-lubricating oil heat exchanger and then pass through the fuel-lubricating oil heat exchanger; when the first, third, fifth and seventh steplessly adjustable valves are closed and the other steplessly adjustable valves are opened, the air-lubricating oil heat exchanger and the fuel-lubricating oil heat exchanger are in a series topology structure. topological structure and first passes through the fuel-lubricating oil heat exchanger and then passes through the air-lubricating oil heat exchanger; when the third steplessly adjustable valve, the fourth steplessly adjustable valve, the fifth steplessly adjustable valve and the sixth steplessly adjustable valve are closed and the other steplessly adjustable valves are opened, the air-lubricating oil heat exchanger and the fuel-lubricating oil heat exchanger are in a parallel topological structure; when only the first steplessly adjustable valve and the eighth steplessly adjustable valve are opened, the air-lubricating oil heat exchanger is used alone; when only the second steplessly adjustable valve and the seventh steplessly adjustable valve are opened, the fuel-lubricating oil heat exchanger is used alone.

[0011] After the fuel oil heat exchanger and lubricating oil are heated, the fuel oil is divided into two paths, one path is returned through the oil return regulating valve, and the other path enters the main combustion chamber for combustion.

[0012] The air-lubricating oil heat exchanger uses bypass air as a heat sink to cool the lubricating oil, while the fuel-lubricating oil heat exchanger uses fuel as a heat sink to cool the lubricating oil.

[0013] The oil return regulating valve adjusts the hot oil return flow rate according to the maximum fuel temperature. When the maximum temperature exceeds the limit temperature, the oil return regulating valve will increase the hot oil return flow rate to stabilize the maximum temperature at the limit value.

[0014] The present invention monitors the key node parameters of each flow path in real time and feeds them back to the actuator. The device executes commands according to the corresponding control strategy based on the identified working conditions. Ultimately, while meeting the heat dissipation requirements of the bearing cavity and the maximum temperature limit requirements of the fuel, the fuel system fuel inlet temperature threshold and the combustion chamber fuel inlet temperature are increased, and the hot return oil flow and hot return oil temperature are reduced.

[0015] After the lubricating oil passes through the fuel-lubricating oil heat exchanger, the air-lubricating oil heat exchanger and eight steplessly adjustable valves to form a lubricating oil variable topology flow path, the lubricating oil temperature is relatively low at this time, and it enters the bearing cavity to absorb heat, and finally returns to the lubricating oil tank to complete the entire cycle.

[0016] After the fuel oil heat exchanger and lubricating oil are heated, the fuel oil is divided into two paths, one path is returned through the oil return regulating valve, and the other path enters the main combustion chamber for combustion.

[0017] The fuel and lubricating oil system of the present invention is mainly composed of a main fuel oil circuit, a hot return oil circuit, a lubricating oil circulation oil circuit, and a lubricating oil variable topology oil circuit. The thermal load in the system is the heat generated by the bearing cavity. The system adjusts the topology of the thermal management system in real time according to the set control strategy and combined with the working condition change, so as to achieve efficient use of the fuel heat sink and the duct air heat sink to remove the system heat load. The system identifies different working conditions by detecting parameters such as the working fluid temperature, flow rate, and fuel pump speed, and sends command signals to each actuator to control the actuation of each actuator, thereby changing the topology of the thermal management system. The present invention meets the heat dissipation requirements of the bearing cavity in the fuel and lubricating oil system. At the same time, the system identifies different working conditions by monitoring key nodes and cooperating with multiple actuators, and automatically matches the corresponding optimal thermal management system topology in combination with the control strategy, so as to achieve the variable topology of the thermal management system of the fuel and lubricating oil system.

[0018] The present invention has the following gain effects: The present invention avoids the relatively fixed thermal management strategy of the fuel and lubricating oil system adopted by traditional aircraft engines, and innovatively designs a variable topology flow path for the lubricating oil. Under different working conditions, the topology structure of the thermal management system is changed by changing the state of the regulating valve group to improve the overall architecture's utilization efficiency of the heat sink, thereby improving the fuel temperature and reducing the return oil flow. While avoiding excessive fuel temperature in the fuel system, the hot return oil flow and temperature are controlled to a minimum, extending the service life of each accessory in the aircraft engine's fuel and lubricating oil system. The design of a variable topology fuel and lubricating oil self-matching thermal management system for aircraft engines can provide a basis for the thermal management of aircraft systems and the variable topology design of environmental control systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the structural block diagram of the variable topology fuel and oil self-matching thermal management system for aircraft engines.

[0020] Figure 2 Figures 1 and 2 are flow path state diagrams under various topological structures of the variable topology thermal management system, wherein a is a schematic diagram of the air-lubricating oil heat exchanger and the fuel-lubricating oil heat exchanger in a series topological structure and first passing through the air-lubricating oil heat exchanger and then through the fuel-lubricating oil heat exchanger, b is a schematic diagram of the air-lubricating oil heat exchanger and the fuel-lubricating oil heat exchanger in a series topological structure and first passing through the fuel-lubricating oil heat exchanger and then through the air-lubricating oil heat exchanger, c is a schematic diagram of the air-lubricating oil heat exchanger and the fuel-lubricating oil heat exchanger in a parallel topological structure, d is a schematic diagram of using an air-lubricating oil heat exchanger alone, and e is a schematic diagram of using a fuel-lubricating oil heat exchanger alone.

[0021] Markings in the figure: 1 - lubricating oil tank, 2 - lubricating oil pump, 3 - first stepless adjustable valve, 4 - second stepless adjustable valve, 5 - third stepless adjustable valve, 6 - fourth stepless adjustable valve, 7 - air-lubricating oil heat exchanger, 8 - fifth stepless adjustable valve, 9 - sixth stepless adjustable valve, 10 - seventh stepless adjustable valve, 11 - eighth stepless adjustable valve, 12 - bearing chamber, 13 - oil supply system, 14 - fuel-lubricating oil heat exchanger, 15 - main combustion chamber, 16 - return oil regulating valve. Detailed implementation manners

[0022] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings.

[0023] As Figure 1 shown, an aviation engine fuel-lubricating oil system that can automatically match the topology of the thermal management system according to the working conditions, achieving the optimal topology under various working conditions to optimize the utilization efficiency of the system for the heat sink.

[0024] An aviation engine variable-topology fuel-lubricating oil thermal management system includes: lubricating oil tank 1, lubricating oil pump 2, fuel-lubricating oil heat exchanger 14, air-lubricating oil heat exchanger 7, bearing chamber 12, oil supply system 13, main combustion chamber 15, return oil regulating valve 16, first stepless adjustable valve 3, second stepless adjustable valve 4, third stepless adjustable valve 5, fourth stepless adjustable valve 6, fifth stepless adjustable valve 8, sixth stepless adjustable valve 9, seventh stepless adjustable valve 10, and eighth stepless adjustable valve 11; the lubricating oil tank 1 is connected to the lubricating oil pump 2, and the lubricating oil pump 2 is connected to the air-lubricating oil heat exchanger 7 through the first stepless adjustable valve 3 and to the fuel-lubricating oil heat exchanger 14 through the second stepless adjustable valve 4; the bearing chamber 12 is connected to the fuel-lubricating oil heat exchanger 14 through the seventh stepless adjustable valve 10 and to the air-lubricating oil heat exchanger 7 through the eighth stepless adjustable valve 11; the bearing chamber 12 is connected to the lubricating oil tank 1; the fuel-lubricating oil heat exchanger 14 is connected to the oil supply system 13, the main combustion chamber 15, and the return oil regulating valve 16; the third stepless adjustable valve 5 and the fifth stepless adjustable valve 8 are connected in series between the second stepless adjustable valve 4 and the eighth stepless adjustable valve 11; the sixth stepless adjustable valve 9 is connected between the fifth stepless adjustable valve 8 and the seventh stepless adjustable valve 10; the fourth stepless adjustable valve 6 is connected between the first stepless adjustable valve 3 and the third stepless adjustable valve 5.

[0025] The fuel-lubricating oil heat exchanger 14, the air-lubricating oil heat exchanger 7, and the first stepless adjustable valve 3, the second stepless adjustable valve 4, the third stepless adjustable valve 5, the fourth stepless adjustable valve 6, the fifth stepless adjustable valve 8, the sixth stepless adjustable valve 9, the seventh stepless adjustable valve 10, and the eighth stepless adjustable valve 11 form a variable-topology flow path for the lubricating oil, which is integrally connected in a "day" shape.

[0026] In the variable topology flow path of the lubricating oil, the first steplessly adjustable valve 3, the second steplessly adjustable valve 4, the third steplessly adjustable valve 5, and the fourth steplessly adjustable valve 6 form a group of four regulating valves, and the fifth steplessly adjustable valve 8, the sixth steplessly adjustable valve 9, the seventh steplessly adjustable valve 10, and the eighth steplessly adjustable valve 11 form another group of four regulating valves, which are connected in sequence by four three-way connections; the fifth steplessly adjustable valve 8 and the sixth steplessly adjustable valve 9 are connected to the third steplessly adjustable valve 5 and the fourth steplessly adjustable valve 6. The three-way connection of the two valve groups is realized through a pipeline; the three-way connection between the fifth steplessly adjustable valve 8 and the eighth steplessly adjustable valve 11 and the sixth steplessly adjustable valve 9 and the seventh steplessly adjustable valve 10 is respectively connected to one side of the air-lubricating oil heat exchanger 7 and the fuel-lubricating oil heat exchanger 14, and the three-way connection between the first steplessly adjustable valve 3 and the fourth steplessly adjustable valve 6 and the second steplessly adjustable valve 4 and the third steplessly adjustable valve 5 is respectively connected to the other side of the air-lubricating oil heat exchanger 7 and the fuel-lubricating oil heat exchanger 14.

[0027] A variable topology fuel and lubricating oil self-matching thermal management system for an aircraft engine is mainly composed of a main fuel oil circuit, a hot oil return oil circuit, a lubricating oil circulation oil circuit, and a lubricating oil variable topology flow circuit.

[0028] Among them, in the lubricating oil circulation circuit, the lubricating oil starts from the lubricating oil tank 1, passes through the lubricating oil pump 2, and enters the lubricating oil variable topology flow path composed of the air-lubricating oil heat exchanger 7, the fuel-lubricating oil heat exchanger 14 and eight steplessly adjustable valves. In the variable topology lubricating oil flow path, the topology structure will identify the working condition and transform the topology structure according to the pre-set variable topology scheme. The topology structure transformation method is that when the second steplessly adjustable valve 4, the fourth steplessly adjustable valve 6, the sixth steplessly adjustable valve 9, and the eighth steplessly adjustable valve 11 in the variable topology flow path are closed, and the remaining adjustable valves are opened, the air-lubricating oil heat exchanger 7 and the fuel-lubricating oil heat exchanger 14 are in a series topology structure and first pass through the air-lubricating oil heat exchanger 7 and then pass through the fuel-lubricating oil heat exchanger 14, such as Figure 2 a; when the first steplessly adjustable valve 3, the third steplessly adjustable valve 5, the fifth steplessly adjustable valve 8, and the seventh steplessly adjustable valve 10 are closed, and the remaining steplessly adjustable valves are opened, the air-lubricating oil heat exchanger 7 and the fuel-lubricating oil heat exchanger 14 are in a series topological structure and first pass through the fuel-lubricating oil heat exchanger 14 and then pass through the air-lubricating oil heat exchanger 7, as shown in FIG. Figure 2 b; when the third steplessly adjustable valve 5, the fourth steplessly adjustable valve 6, the fifth steplessly adjustable valve 8, and the sixth steplessly adjustable valve 9 are closed, and the remaining steplessly adjustable valves are opened, the air-lubricating oil heat exchanger 7 and the fuel-lubricating oil heat exchanger 14 are in a parallel topological structure, as shown in FIG. Figure 2 c; when only the first steplessly adjustable valve 3 and the eighth steplessly adjustable valve 11 are opened, the air-lubricating oil heat exchanger 7 is used alone, such as Figure 2 When only the second steplessly adjustable valve 4 and the seventh steplessly adjustable valve 10 are opened, the fuel oil heat exchanger 14 is used alone, such as Figure 2e; through the above method, the topology structure is switched according to the working condition changes under the entire flight envelope, so that the thermal management system is always in the optimal topology structure to achieve efficient use of the heat sink; Finally, after the lubricating oil is cooled by the front variable topology flow path, the lubricating oil temperature reaches the lowest, enters the bearing cavity 8 to absorb heat, and finally returns to the lubricating oil tank 1 to complete a whole cycle; The fuel in the fuel system is divided into two paths after heat exchange with the lubricating oil in the fuel-lubricating oil heat exchanger 14, one path is returned through the oil return regulating valve 16, and the other path enters the main combustion chamber 15 for combustion.

[0029] In the hot return oil circuit, the return oil regulating valve 16 adjusts the hot return oil flow rate according to the maximum fuel temperature in the fuel system. When the maximum temperature in the fuel system exceeds the limit temperature, the return oil regulating valve will increase the hot return oil flow rate to stabilize the maximum temperature at the limit value.

[0030] The present invention innovatively designs a variable topology flow path for lubricating oil. Under different working conditions, the topology structure of the thermal management system is changed by changing the state of the regulating valve group to improve the overall architecture's utilization efficiency of the heat sink, thereby improving the fuel temperature and reducing the return oil flow. While avoiding excessive fuel temperature in the fuel system, the hot return oil flow and temperature are controlled to a minimum, extending the service life of various accessories in the aircraft engine fuel and lubricating oil system. It can provide a basis for the variable topology design of the thermal management and environmental control systems of aircraft systems.

[0031] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A variable topology fuel and lubricating oil thermal management system for an aircraft engine, characterized in that: Including: An oil sump (1), an oil pump (2), a fuel-oil heat exchanger (14), an air-oil heat exchanger (7), a bearing chamber (12), an oil supply system (13), a main combustion chamber (15), a return oil regulating valve (16), a first continuously adjustable valve (3), a second continuously adjustable valve (4), a third continuously adjustable valve (5), a fourth continuously adjustable valve (6), a fifth continuously adjustable valve (8), a sixth continuously adjustable valve (9), a seventh continuously adjustable valve (10), and an eighth continuously adjustable valve (11); the oil sump (1) is connected to the oil pump (2), the oil pump (2) is connected to the air-oil heat exchanger (7) through the first continuously adjustable valve (3) and is connected to the fuel-oil heat exchanger (14) through the second continuously adjustable valve (4); the bearing chamber (12) is connected to the fuel-oil heat exchanger (14) through the seventh continuously adjustable valve (10) and is connected to the air-oil heat exchanger (7) through the eighth continuously adjustable valve (11); the bearing chamber (12) is connected to the oil sump (1); the fuel-oil heat exchanger (14) is connected to the oil supply system (13), the main combustion chamber (15), and the return oil regulating valve (16); the third continuously adjustable valve (5) and the fifth continuously adjustable valve (8) are connected in series between the second continuously adjustable valve (4) and the eighth continuously adjustable valve (11); the sixth continuously adjustable valve (9) is connected between the fifth continuously adjustable valve (8) and the seventh continuously adjustable valve (10); the fourth continuously adjustable valve (6) is connected between the first continuously adjustable valve (3) and the third continuously adjustable valve (5).

2. The aircraft engine variable topology fuel and lubricating oil thermal management system according to claim 1, characterized in that: The fuel-oil heat exchanger (14), the air-oil heat exchanger (7), and the first continuously adjustable valve (3), the second continuously adjustable valve (4), the third continuously adjustable valve (5), the fourth continuously adjustable valve (6), the fifth continuously adjustable valve (8), the sixth continuously adjustable valve (9), the seventh continuously adjustable valve (10), and the eighth continuously adjustable valve (11) form a variable topological oil flow path, which is integrally connected in a "day" shape.

3. The aircraft engine variable topology fuel and lubricating oil thermal management system according to claim 2, characterized in that: In the lubricating oil variable topology flow path, the four regulating valves, namely the first steplessly adjustable valve (3), the second steplessly adjustable valve (4), the third steplessly adjustable valve (5), and the fourth steplessly adjustable valve (6), form a group, and the four regulating valves, namely the fifth steplessly adjustable valve (8), the sixth steplessly adjustable valve (9), the seventh steplessly adjustable valve (10), and the eighth steplessly adjustable valve (11), form another group, which are connected in sequence by four three-way connections; the fifth steplessly adjustable valve (8) and the sixth steplessly adjustable valve (9) are connected to the third steplessly adjustable valve (5) and the fourth steplessly adjustable valve (6). The three-way connection of the valve groups is connected by a pipeline to realize the interconnection between the two valve groups; the three-way connection between the fifth steplessly adjustable valve (8) and the eighth steplessly adjustable valve (11) and the sixth steplessly adjustable valve (9) and the seventh steplessly adjustable valve (10) is respectively connected to one side of the air-lubricating oil heat exchanger (7) and the fuel-lubricating oil heat exchanger (14); the three-way connection between the first steplessly adjustable valve (3) and the fourth steplessly adjustable valve (6) and the second steplessly adjustable valve (4) and the third steplessly adjustable valve (5) is respectively connected to the other side of the air-lubricating oil heat exchanger (7) and the fuel-lubricating oil heat exchanger (14).

4. The aircraft engine variable topology fuel and lubricating oil thermal management system according to claim 3, characterized in that: When the second steplessly adjustable valve (4), the fourth steplessly adjustable valve (6), the sixth steplessly adjustable valve (9), and the eighth steplessly adjustable valve (11) in the variable topology flow path are closed, and the remaining steplessly adjustable valves are opened, the air-lubricating oil heat exchanger (7) and the fuel-lubricating oil heat exchanger (14) are in a series topology structure and first pass through the air-lubricating oil heat exchanger (7) and then pass through the fuel-lubricating oil heat exchanger (14); when the first steplessly adjustable valve (3), the third steplessly adjustable valve (5), the fifth steplessly adjustable valve (8), and the seventh steplessly adjustable valve (10) are closed, and the remaining steplessly adjustable valves are opened, the air-lubricating oil heat exchanger (7) and the fuel-lubricating oil heat exchanger (14) are in a series topology structure. The topological structure first passes through the fuel oil heat exchanger (14) and then passes through the air-lubricating oil heat exchanger (7); when the third steplessly adjustable valve (5), the fourth steplessly adjustable valve (6), the fifth steplessly adjustable valve (8), and the sixth steplessly adjustable valve (9) are closed, and the remaining steplessly adjustable valves are opened, the air-lubricating oil heat exchanger (7) and the fuel oil heat exchanger (14) are in a parallel topological structure; when only the first steplessly adjustable valve (3) and the eighth steplessly adjustable valve (11) are opened, the air-lubricating oil heat exchanger (7) is used alone; when only the second steplessly adjustable valve (4) and the seventh steplessly adjustable valve (10) are opened, the fuel oil heat exchanger (14) is used alone.

5. The aircraft engine variable topology fuel and lubricating oil thermal management system according to claim 1, characterized in that: After the fuel oil heat exchanger (14) exchanges heat with the lubricating oil, the fuel oil is divided into two paths, one path is returned through the oil return regulating valve (16), and the other path enters the main combustion chamber (15) for combustion.

6. The aircraft engine variable topology fuel and lubricating oil thermal management system according to claim 1, characterized in that: The air-lubricating oil heat exchanger (7) uses bypass air as a heat sink to cool the lubricating oil, and the fuel-lubricating oil heat exchanger (14) uses fuel oil as a heat sink to cool the lubricating oil.

7. The aircraft engine variable topology fuel and lubricating oil thermal management system according to claim 1, characterized in that: The oil return regulating valve (16) adjusts the hot oil return flow rate according to the maximum fuel temperature. When the maximum temperature exceeds the limit temperature, the oil return regulating valve (16) increases the hot oil return flow rate to stabilize the maximum temperature at the limit value.

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