Low-pressure high-temperature cold air preparation system adopting fuel oil cracking heat sink

Abstract

The invention belongs to the field of hypersonic aircraft airborne systems, and particularly relates to a low-pressure high-temperature cold air preparation system adopting a fuel oil cracking heat sink, which comprises an oil supply system for providing a first path of fuel oil and a second path of fuel oil; the turbine cooling system comprises a cold air generating turbine, a cold air generating compressor, a plate heat exchanger and a cold air generating vortex tube; the cold air generating turbine drives the cold air generating compressor to rotate, the cold air generating compressor compresses air in the air inlet channel into high-pressure air, the high-pressure air enters the plate heat exchanger, and the first path of fuel oil is cracked and absorbs heat after passing through the plate heat exchanger to form a first path of cracked fuel oil; high-pressure gas of the plate heat exchanger forms high-pressure cooling gas through first-path fuel oil cracking heat absorption; the engine combustion chamber is used for combusting the second path of fuel oil and the first path of cracked fuel oil to provide power for the aircraft; and the cold air generating vortex tube is used for providing cooling air for the airborne electronic equipment cabin through the high-pressure cooling air.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of hypersonic vehicle on-board system, and particularly relates to a low-pressure high-temperature cold gas production system adopting a fuel cracking heat sink. BACKGROUND

[0002] Vehicle thermal management controls the transmission of thermal energy of the whole machine to ensure the flight safety of the hypersonic vehicle. With the development of aviation technology, the parameters of the vehicle are continuously improved, and the heat dissipation demand of the high-integrated on-board electronic equipment is continuously rising. The vehicle in hypersonic flight is in a low-pressure high-temperature environment, and it is difficult to directly introduce external cold gas into the equipment cabin for cooling, which poses a challenge to the development of the cooling device. SUMMARY

[0003] In order to solve the above problems, the application provides a low-pressure high-temperature cold gas production system adopting a fuel cracking heat sink, comprising:

[0004] An oil supply system provides first fuel and second fuel;

[0005] A turbine cooling system, comprising: a cold gas production turbine, a cold gas production compressor, a plate heat exchanger and a cold gas production vortex tube; the cold gas production turbine drives the cold gas production compressor to rotate, the cold gas production compressor compresses the gas in the air inlet into high-pressure gas, the high-pressure gas enters the plate heat exchanger, the first fuel is cracked and absorbs heat after passing through the plate heat exchanger, forming first cracked fuel; the high-pressure gas of the plate heat exchanger is cracked and absorbs heat by the first fuel to form high-pressure cooling gas;

[0006] An engine combustion chamber burns the second fuel and the first cracked fuel to provide power for the aircraft;

[0007] A cold gas production vortex tube provides cooling gas for the on-board electronic equipment cabin through the high-pressure cooling gas.

[0008] Preferably, the temperature of the plate heat exchanger is controlled between 300 and 500 degrees Celsius.

[0009] Preferably, a catalyst for fuel cracking is arranged in the pipeline through which the first fuel passes in the plate heat exchanger.

[0010] Preferably, the catalyst comprises a platinum-based catalyst.

[0011] Preferably, a temperature sensor is arranged on the plate heat exchanger, a flow valve is arranged at the first fuel inlet of the plate heat exchanger, and the controller adjusts the opening degree of the flow valve according to the feedback temperature of the temperature sensor, so that the temperature of the plate heat exchanger is controlled between 300 and 500 degrees Celsius.

[0012] Preferably, the catalyst position is provided with a honeycomb structure.

[0013] Preferably, the total amount of the first and second fuels is determined by the throttle lever, and the amount of the first fuel is determined by the temperature of the plate heat exchanger.

[0014] Preferably, the second fuel is connected to the main nozzle of the engine combustion chamber, and the first fuel is connected to the side wall nozzle of the engine combustion chamber.

[0015] Preferably, the second fuel and the first fuel are mixed into one before entering the engine combustion chamber.

[0016] The advantages of the present application include:

[0017] 1. Since the temperature in the compressor of the cold gas production device rises greatly, the hydrocarbon fuel is cracked at high temperature, and the cracking can absorb a large amount of heat, thereby providing an additional heat sink cooling effect better than a physical heat sink.

[0018] 2. The heat absorbed by fuel cracking is converted into chemical energy, which can be regarded as a chemical regenerative process, which improves the overall energy grade of the fuel, and this part of the fuel helps efficient combustion and performance improvement when used for engine fuel supply.

[0019] 3. The fuel is stored in the fuel tank, and during actual fuel supply, it is delivered to the fuel supply tank by the valve under the action of gravity. The fuel supply tank is provided with an electric control valve and a cooling oil pump. A part of the fuel is used as a heat sink and flows into the plate heat exchanger along the pipeline to cool the high-temperature gas. The remaining fuel flows into the engine through the bypass valve. The fuel output flow can be controlled, and the cooling oil amount can be adjusted in real time according to the cold gas production demand and the engine operating state, so as to effectively control the fuel cracking temperature within the carbon deposition temperature. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a preferred embodiment of the present application, which is a low-pressure high-temperature cold gas production system using fuel cracking heat sink. DETAILED DESCRIPTION

[0021] In order to make the technical solutions of the present application and their advantages clearer, the technical solutions of the present application will be further described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only part of the embodiments of the present application, and are only used to explain the present application, but not to limit the present application. It should be noted that, for the sake of description, only parts related to the present application are shown in the drawings, and other related parts can be referred to the usual design. In the case of no conflict, the embodiments in the present application and the technical features in the embodiments can be combined to obtain new embodiments.

[0022] As Figure 1As shown, the application discloses a low-pressure high-temperature cold gas production system using fuel cracking heat sink and a working method thereof, which organically combines aircraft thermal management technology to realize efficient cold gas production of an airborne electronic equipment cabin. The application uses fuel as a heat sink, and in particular, adopts a fuel cracking mode, is suitable for high flight Mach number, and can effectively reduce the high-pressure gas temperature at the outlet of the cold gas production compressor. Meanwhile, the application can also adjust the cooling fuel flow in real time according to the cooling demand of the airborne electronic equipment cabin and the working state of the aircraft, and control the fuel temperature at the inlet of the engine combustion chamber within the carbon deposition temperature.

[0023] As shown, Figure 1 As shown, a cold gas production method under a low-pressure high-temperature cold gas environment based on a fuel cracking heat sink, including an oil storage tank 1, an oil supply tank 3, both of which are connected through an oil storage tank electric control valve 2, fuel flows from the oil storage tank to the oil supply tank under the action of gravity. The outlet of the oil supply tank includes a cooling oil electric control valve 4, a cooling oil pump 6 and a fuel oil electric control valve 5, an oil supply pump 7, the cooling oil electric control valve 4 is connected with the cooling oil pump 6, and then leads to the cold side inlet of the plate heat exchanger 11, the fuel oil electric control valve 5 is connected with the oil supply pump 7, and directly leads to the engine combustion chamber 8. The cold gas production turbine 9 drives the cold gas production compressor 10 to rotate, and the high-pressure gas at the outlet of the cold gas production compressor 10 enters the plate heat exchanger 11, and exchanges heat with the cooling fuel flowing to the plate heat exchanger 11 through the cooling oil electric control valve 4 and the cooling oil pump 6, and the temperature is greatly reduced. The cooled high-pressure gas flows out from the outlet of the plate heat exchanger 11, enters the cold gas production vortex tube 12, and exchanges heat in the vortex tube. The gas is divided into cold and hot two beams, and the cold side gas enters the airborne electronic equipment cabin 13 along the pipeline as a cooling gas to provide the required refrigeration capacity of the airborne equipment. When the cooling demand of the airborne electronic equipment cabin or the working state of the aircraft changes, the cooling oil electric control valve 4 and the fuel oil electric control valve 5 can be adjusted in real time to control the cooling oil flow for high-temperature gas cooling and the fuel oil flow for engine combustion chamber combustion, so as to ensure smooth operation of the airborne equipment of the aircraft and normal flight power system of the aircraft.

[0024] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A low-pressure, high-temperature cold gas production system employing a fuel pyrolysis heat sink, characterized in that, include: The fuel supply system provides fuel through both the first and second fuel lines. The turbine cooling system includes: a cold gas generating turbine (9), a cold gas generating compressor (10), a plate heat exchanger (11), and a cold gas generating vortex tube (12); the cold gas generating turbine (9) drives the cold gas generating compressor (10) to rotate, the cold gas generating compressor (10) compresses the gas in the intake port into high-pressure gas, the high-pressure gas enters the plate heat exchanger (11), the first-path fuel oil is cracked and absorbs heat after passing through the plate heat exchanger (11) to form the first-path cracked fuel oil; the high-pressure gas in the plate heat exchanger (11) is cracked and absorbs heat through the first-path fuel oil to form high-pressure cooling gas; The engine combustion chamber (8) burns the second fuel and the first cracked fuel to provide power to the aircraft; The cold gas generating vortex tube (12) provides cooling gas to the airborne electronic equipment bay (13) through the high-pressure cooling gas.

2. The low-pressure, high-temperature cold gas production system using a fuel pyrolysis heat sink as described in claim 1, characterized in that, include: The temperature of the plate heat exchanger (11) is controlled between 300 degrees Celsius and 500 degrees Celsius.

3. The low-pressure, high-temperature cold gas production system using a fuel pyrolysis heat sink as described in claim 2, characterized in that, The first fuel oil pipeline in the plate heat exchanger (11) is equipped with a fuel oil cracking catalyst.

4. The low-pressure, high-temperature cold gas production system using a fuel pyrolysis heat sink as described in claim 3, characterized in that, The catalyst includes a platinum-based catalyst.

5. The low-pressure, high-temperature cold gas production system using a fuel pyrolysis heat sink as described in claim 3, characterized in that, A temperature sensor is installed on the plate heat exchanger (11), and a flow valve is installed at the first fuel inlet of the plate heat exchanger (11). The controller adjusts the opening of the flow valve based on the feedback temperature from the temperature sensor so that the temperature of the plate heat exchanger (11) is controlled between 300 degrees Celsius and 500 degrees Celsius.

6. The low-pressure, high-temperature cold gas production system using a fuel pyrolysis heat sink as described in claim 3, characterized in that, The catalyst location is provided with a honeycomb structure.

7. The low-pressure, high-temperature cold gas production system using a fuel pyrolysis heat sink as described in claim 3, characterized in that, The total amount of fuel in the first and second fuel lines is determined by the throttle lever, and the amount of fuel in the first fuel line is determined by the temperature of the plate heat exchanger (11).

8. The low-pressure, high-temperature cold gas production system using a fuel pyrolysis heat sink as described in claim 7, characterized in that, The second fuel line is connected to the main nozzle of the engine combustion chamber, and the first cracked fuel line is connected to the nozzle on the side wall of the engine combustion chamber.

9. The low-pressure, high-temperature cold gas production system using a fuel pyrolysis heat sink as described in claim 7, characterized in that, The second fuel and the first cracked fuel are mixed together in front of the engine combustion chamber (8).

Images