A flame detection system for a turbofan afterburner

Abstract

The application belongs to the field of combustion chamber design, and particularly relates to a flame detection system for a turbofan engine afterburner, which comprises an ultraviolet light detector, an optical fiber cable and a controller. One end of the optical fiber cable is connected with the ultraviolet light detector, and the other end is connected with the controller. An optoelectronic conversion module is arranged in the controller. The optoelectronic conversion module can receive optical signals transmitted by the optical fiber cable, convert the optical signals into electrical signals and output the electrical signals. The controller is subjected to high-temperature resistant packaging treatment on the outside, and an oil cooling module capable of cooling the optoelectronic conversion module is arranged in the controller. The optoelectronic conversion module in the ultraviolet light detector is removed, and only an ultraviolet photocell is reserved and subjected to high-temperature resistant packaging treatment, so that the detector can directly withstand a high-temperature environment of 250 DEG C on the outer wall of the afterburner, and a complex heat insulation and cooling structure does not need to be additionally designed for the detector, and a core problem that electronic components in a traditional detector do not match the working environment temperature is completely solved.

Description

Technical Field

[0001] This application belongs to the field of combustion chamber design, and specifically relates to a flame detection system for an afterburner of an aero-engine. Background Technology

[0002] As a key component of the engine, the afterburner provides short-term thrust boost and widens the flight envelope of the fighter jet, playing a crucial role in mission execution and escape. Therefore, it is necessary to detect whether the afterburner flame is functioning properly. However, with the improvement of engine performance, the temperature of the afterburner is also increasing, which places higher demands on afterburner flame detection technology.

[0003] Currently, advanced ultraviolet light detection technology is used in the afterburners of aero engines. Ultraviolet light is detected by a phototube, and then a photoelectric conversion module converts the optical signal into an electrical signal, which is transmitted to the acquisition terminal via cable.

[0004] Existing afterburner ultraviolet (UV) detection technology consists of a UV flame detector, cables, and a controller. The UV flame detector comprises a UV phototube and a photoelectric conversion module, resulting in a relatively large detector size. Because the flame detector is installed on the outer wall of the afterburner, the ambient temperature is high (250℃), but the electronic components in the photoelectric conversion module can only withstand temperatures up to 150℃ for extended periods. Therefore, the flame detector requires heat insulation and other cooling methods, increasing design complexity and leading to characteristic drift during operation, which affects detection performance.

[0005] Therefore, how to more effectively detect afterburners is a problem that needs to be solved. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a flame detection system for the afterburner of an aero-engine, thereby resolving the problem that existing detection technologies are insufficient to meet the ambient temperature requirements of the afterburner.

[0007] The technical solution of this application is: a flame detection system for the afterburner of an aero-engine, comprising an ultraviolet light detector, an optical fiber cable, and a controller; one end of the optical fiber cable is connected to the ultraviolet light detector, and the other end is connected to the controller;

[0008] The controller is equipped with a photoelectric conversion module, which can receive optical signals transmitted by optical fiber cables, convert them into electrical signals, and output them. The controller is externally encapsulated for high temperature resistance, and the controller is internally equipped with an oil cooling module that can cool the photoelectric conversion module.

[0009] Preferably, the oil cooling module includes a cooling oil storage chamber, a forced circulation oil circuit, a heat exchange chamber, and an oil temperature control component;

[0010] The cooling oil storage chamber stores cooling lubricating oil, and the heat exchange chamber is connected to the cooling oil storage chamber through a forced circulation oil circuit. The oil temperature control component can control the temperature of the oil cooling module. The photoelectric conversion module is fixed on the heat-conducting substrate of the heat exchange chamber.

[0011] Preferably, the cooling oil storage chamber is located inside the controller housing and has a volume of 80-100mL. The outer wall of the cooling oil storage chamber is provided with a heat insulation coating, the bottom is provided with an inclined oil collection surface, the lowest point is an open oil port, and the top is provided with an oil filling port and a vent valve. The vent valve has a built-in microfiltration membrane.

[0012] Preferably, the forced circulation oil circuit includes a micro gear pump and an oil circuit pipeline. The micro gear pump is located on the oil pump pipeline, and the two ends of the oil circuit pipeline are connected to the heat exchange chamber and the cooling oil storage chamber, respectively. The connection parts of the oil circuit pipeline are connected by compression fittings.

[0013] Preferably, the thermally conductive substrate is made of oxygen-free copper and has a nickel-plated surface. One side of the thermally conductive substrate is tightly bonded to the heat dissipation surface of the photoelectric conversion module through thermally conductive silicone, and the other side is processed with a serpentine heat exchange channel with the inner wall of the channel being polished.

[0014] Preferably, the oil temperature control component includes a temperature sensor, an oil temperature bypass valve, and a heat dissipation auxiliary structure; the temperature sensor is a surface-mount platinum resistance temperature sensor, installed at the oil return port of the heat exchange chamber; the oil temperature bypass valve is installed on the bypass pipe of the main circulating oil circuit, and is a mechanical temperature control valve with an opening temperature set at 45°C. When the cooling oil temperature is below 45°C, the bypass valve closes, and the cooling oil circulates through the main heat exchange channel; when the oil temperature is above 45°C, the bypass valve gradually opens, and part of the cooling oil flows directly back to the oil storage chamber through the bypass pipe; the heat dissipation auxiliary structure is located on the outer wall of the cooling oil storage chamber, and includes multiple heat dissipation fins spaced apart, the fins being made of aluminum alloy, with a fin height of 10mm and a spacing of 5mm.

[0015] The flame detection system for the afterburner of an aircraft engine disclosed in this application has the following advantages:

[0016] By removing the photoelectric conversion module inside the ultraviolet detector and retaining only the ultraviolet phototube, which is then encapsulated in a high-temperature resistant manner, the detector can directly withstand the high-temperature environment of 250°C on the outer wall of the afterburner. This eliminates the need for additional complex heat insulation and cooling structures for the detector, completely solving the core problem of the mismatch between the temperature resistance of electronic components and the operating environment temperature in traditional detectors. This allows the detection equipment to stably adapt to the high-temperature operating scenarios after the engine performance is improved.

[0017] By using fiber optic cables to replace traditional electrical signal cables for transmitting optical signals, the attenuation problem during electrical signal transmission is completely solved, ensuring that the detection signal is lossless from acquisition to processing, and greatly improving the accuracy and stability of the flame state judgment in the afterburner. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this application.

[0019] 1. Ultraviolet light detector; 2. Fiber optic cable; 3. Controller; 4. Photoelectric conversion module; 5. Cooling oil storage chamber; 6. Forced circulation oil circuit; 7. Thermal conductive substrate; 8. Miniature gear pump. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0021] The first aspect of this application provides a flame detection system for the afterburner of an aircraft engine, such as... Figure 1 It includes an ultraviolet light detector 1, an optical fiber cable 2, and a controller 3; one end of the optical fiber cable 2 is connected to the ultraviolet light detector 1, and the other end is connected to the controller 3.

[0022] The controller 3 is equipped with a photoelectric conversion module 4, which can receive the optical signal transmitted by the optical fiber cable 2, convert it into an electrical signal and output it. The controller 3 is encapsulated on the outside with high temperature resistance, and the controller 3 is equipped with an oil cooling module that can cool the photoelectric conversion module 4.

[0023] The system adopts a split structure of ultraviolet detector 1 + fiber optic cable 2 + controller 3, eliminating the built-in photoelectric conversion module 4 of ultraviolet detector 1, which greatly reduces the size of the detector and makes it suitable for the narrow installation space of the afterburner of aero engines. At the same time, it improves the high temperature resistance of the detector and can directly adapt to the high temperature working environment of 250°C on the outer wall of the afterburner without the need for additional heat insulation and cooling structures, thus reducing the design and installation difficulty of the detection system.

[0024] By setting up an oil cooling module, the operating temperature of the photoelectric conversion module 4 can be stably controlled within the long-term temperature resistance of its electronic components to 150℃, avoiding characteristic drift of the components due to high temperature and ensuring the stability and detection accuracy of photoelectric conversion.

[0025] Preferably, the oil cooling module includes a cooling oil storage chamber 5, a forced circulation oil circuit 6, a heat exchange chamber, and an oil temperature control component.

[0026] The cooling oil storage chamber 5 stores cooling lubricating oil. The heat exchange chamber and the cooling oil storage chamber 5 are connected by a forced circulation oil circuit 6. The oil temperature control component can control the temperature of the oil cooling module. The photoelectric conversion module 4 is fixed on the heat-conducting substrate 7 of the heat exchange chamber.

[0027] The oil-cooling module adopts an integrated design of cooling oil storage chamber 5 + forced circulation oil circuit 6 + heat exchange chamber + oil temperature control component to realize closed-loop cooling of photoelectric conversion module 4. The cooling medium flows in a closed loop inside the module, which has high cooling efficiency and does not require an external oil source. It simplifies the external connection structure of controller 3 and adapts to the integration requirements of airborne equipment.

[0028] Preferably, the cooling oil storage chamber 5 is located inside the housing of the controller 3, with a volume of 80-100mL. The outer wall of the cooling oil storage chamber 5 is provided with a heat insulation coating, the bottom is provided with an inclined oil collection surface, the lowest point is an open oil port, and the top is provided with an oil filling port and a vent valve. The vent valve has a built-in microfiltration membrane.

[0029] The cooling oil storage chamber 5 is located inside the housing of the controller 3, realizing the integrated design of the oil cooling module and the controller 3 without occupying additional installation space, which meets the design principle of miniaturization of aviation equipment; the 80-100mL volume design meets the cooling circulation medium requirements while taking into account the volume control of the controller 3.

[0030] Preferably, the forced circulation oil circuit 6 includes a micro gear pump 8 and an oil circuit pipeline. The micro gear pump 8 is located on the oil pump pipeline. The two ends of the oil circuit pipeline are connected to the heat exchange chamber and the cooling oil storage chamber 5, respectively. The connection parts of the oil circuit pipeline are connected by compression fittings.

[0031] The forced circulation oil circuit 6 is equipped with a micro gear pump 8 to provide stable power for the circulation of cooling oil, ensuring that the cooling oil flows through the heat exchange chamber at a constant flow rate, ensuring the stability of heat exchange efficiency, and avoiding heat accumulation due to slow cooling oil flow or energy waste due to excessively fast flow.

[0032] Preferably, the thermally conductive substrate 7 is made of oxygen-free copper and has a nickel-plated surface. One side of the thermally conductive substrate 7 is tightly bonded to the heat dissipation surface of the photoelectric conversion module 4 through thermally conductive silicone, and the other side is processed with a serpentine heat exchange channel with the inner wall of the channel being polished.

[0033] Oxygen-free copper has a high thermal conductivity, which can quickly conduct the heat generated by the photoelectric conversion module 4 to the cooling oil, achieving efficient heat transfer; the surface nickel plating treatment can effectively prevent oxidation and corrosion of the oxygen-free copper substrate, improve the service life of the substrate, and ensure the long-term stability of heat conduction.

[0034] Preferably, the oil temperature control component includes a temperature sensor, an oil temperature bypass valve, and a heat dissipation auxiliary structure. The temperature sensor is a surface-mount platinum resistance temperature sensor, installed at the oil return port of the heat exchange chamber. The oil temperature bypass valve is installed on the bypass pipe of the main circulating oil circuit and is a mechanical temperature control valve with an opening temperature set at 45°C. When the cooling oil temperature is below 45°C, the bypass valve closes, and the cooling oil circulates through the main heat exchange channel. When the oil temperature is above 45°C, the bypass valve gradually opens, and some cooling oil flows directly back to the oil storage chamber through the bypass pipe. The heat dissipation auxiliary structure is located on the outer wall of the cooling oil storage chamber 5 and includes multiple heat dissipation fins spaced apart. The fins are made of aluminum alloy, with a fin height of 10mm and a spacing of 5mm.

[0035] A surface-mount platinum resistance temperature sensor is installed at the oil return port of the heat exchange chamber. It can detect the outlet temperature of the cooling oil after absorbing heat in real time and accurately, providing an accurate temperature signal for oil temperature control. This enables precise monitoring and feedback of the oil temperature, ensuring the timeliness and accuracy of control actions. Combined with heat dissipation fins, it achieves overall temperature balance within controller 3.

[0036] In summary, this application has the following advantages:

[0037] By removing the photoelectric conversion module inside the ultraviolet detector and retaining only the ultraviolet phototube, which is then encapsulated in a high-temperature resistant manner, the detector can directly withstand the high-temperature environment of 250°C on the outer wall of the afterburner. This eliminates the need for additional complex heat insulation and cooling structures for the detector, completely solving the core problem of the mismatch between the temperature resistance of electronic components and the operating environment temperature in traditional detectors. This allows the detection equipment to stably adapt to the high-temperature operating scenarios after the engine performance is improved.

[0038] By using fiber optic cables to replace traditional electrical signal cables for transmitting optical signals, the attenuation problem during electrical signal transmission is completely solved, ensuring that the detection signal is lossless from acquisition to processing, and greatly improving the accuracy and stability of the flame state judgment in the afterburner.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A flame detection system for an afterburner chamber of an aero-engine, characterized in that, It includes an ultraviolet light detector (1), an optical fiber cable (2), and a controller (3); one end of the optical fiber cable (2) is connected to the ultraviolet light detector (1), and the other end is connected to the controller (3); The controller (3) is equipped with a photoelectric conversion module (4), which can receive the optical signal transmitted by the optical fiber cable (2), convert it into an electrical signal and output it; the controller (3) is encapsulated on the outside with high temperature resistance, and the controller (3) is equipped with an oil cooling module that can cool the photoelectric conversion module (4).

2. The afterburner flame detection system for aero-engines as described in claim 1, characterized in that, The oil cooling module includes a cooling oil storage chamber (5), a forced circulation oil circuit (6), a heat exchange chamber, and an oil temperature control component; The cooling oil storage chamber (5) stores cooling lubricating oil. The heat exchange chamber and the cooling oil storage chamber (5) are connected by a forced circulation oil circuit (6). The oil temperature control component can control the temperature of the oil cooling module. The photoelectric conversion module (4) is fixed on the heat-conducting substrate (7) of the heat exchange chamber.

3. The afterburner flame detection system for aero-engines as described in claim 2, characterized in that, The cooling oil storage chamber (5) is located inside the housing of the controller (3) and has a volume of 80-100mL. The outer wall of the cooling oil storage chamber (5) is provided with a heat insulation coating, the bottom is provided with an inclined oil collection surface, the lowest point is an open oil port, the top is provided with an oil filling port and a vent valve, and the vent valve has a built-in microfiltration membrane.

4. The afterburner flame detection system for aero-engines as described in claim 2, characterized in that, The forced circulation oil circuit (6) includes a micro gear pump (8) and an oil circuit pipeline. The micro gear pump (8) is located on the oil pump pipeline. The two ends of the oil circuit pipeline are connected to the heat exchange chamber and the cooling oil storage chamber (5) respectively. The connection parts of the oil circuit pipeline are connected by compression fittings.

5. The afterburner flame detection system for aero-engines as described in claim 2, characterized in that, The thermally conductive substrate (7) is made of oxygen-free copper and has a nickel-plated surface. One side of the thermally conductive substrate (7) is tightly bonded to the heat dissipation surface of the photoelectric conversion module (4) through thermally conductive silicone, and the other side is processed with a serpentine heat exchange channel with the inner wall of the channel being polished.

6. The afterburner flame detection system for aero-engines as described in claim 2, characterized in that, The oil temperature control component includes a temperature sensor, an oil temperature bypass valve, and a heat dissipation auxiliary structure. The temperature sensor is a surface-mount platinum resistance temperature sensor, installed at the return port of the heat exchange chamber. The oil temperature bypass valve is installed on the bypass pipe of the main circulating oil circuit. It is a mechanical temperature control valve with an opening temperature set at 45°C. When the cooling oil temperature is below 45°C, the bypass valve closes, and the cooling oil circulates through the main heat exchange channel. When the oil temperature is above 45°C, the bypass valve gradually opens, and some cooling oil flows directly back to the oil storage chamber through the bypass pipe. The heat dissipation auxiliary structure is located on the outer wall of the cooling oil storage chamber (5) and includes multiple heat dissipation fins spaced apart. The fins are made of aluminum alloy, with a fin height of 10 mm and a spacing of 5 mm.

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