A low flow resistance fuel deaerator for aeroengine combustion chamber testing
By designing a low-flow-resistance fuel degassing device, air bubbles in the fuel system are removed using guide vanes and float structures, solving the problems of unstable combustion and equipment damage, improving test efficiency and data reliability, and reducing test costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- AECC SHENYANG ENGINE RES INST
- Filing Date
- 2026-03-16
- Publication Date
- 2026-06-12
AI Technical Summary
In aero-engine combustion chamber tests, air bubbles in the fuel system can lead to unstable combustion, poor nozzle atomization, and affect test results and equipment damage. Existing technologies are unable to effectively remove air bubbles, resulting in low test efficiency and increased costs.
A low-flow-resistance fuel degassing device is designed, comprising a cylinder, a guide plate, an oil separator cone, and a float. An annular channel is formed by the guide plate, and air bubbles are discharged using the float and a venting rod. The device has a simple structure, does not increase fuel flow resistance, and is suitable for high-temperature and low-temperature fuels.
It effectively removes air bubbles from the fuel system, improves the reliability of test data, reduces test costs, shortens the development cycle, requires no special maintenance, and is adaptable to various operating conditions.
Smart Images
Figure CN122192769A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of aero-engine testing technology, and specifically relates to a low-flow-resistance fuel degassing device for aero-engine combustion chamber testing. Background Technology
[0002] In aero-engine combustor testing, the fuel system is responsible for ensuring the fuel requirements of the test specimen. When air is present in the fuel system, it will affect the atomization effect of the nozzle, causing airlock, and will also affect the performance of the fuel pump, causing damage to the pump body and connecting parts. This will affect the stability of combustion, making it impossible for the combustor to work stably under test conditions, affecting the test results, and bringing adverse factors to the combustor design.
[0003] For example, when fuel is supplied directly from an oil depot, air bubbles may be present in the fuel. If there is a leak in the pipeline, a large number of air bubbles will be present in the fuel. Alternatively, when fuel is supplied using a storage tank, the return oil entering the storage tank will generate a large amount of oil foam, which will also cause air to mix into the fuel and create air bubbles.
[0004] Therefore, the main drawbacks of existing technical solutions are:
[0005] 1) If there are a lot of air bubbles in the fuel system, it will cause unstable combustion in the combustion chamber and surge of the fuel pump, which will affect the test results, resulting in poor repeatability of test data, affecting the design of the combustion chamber, and may even damage the test piece, fuel pump and fuel pump connection device, interrupt the test, increase test costs and reduce test efficiency.
[0006] 2) During the test, it is necessary to manually remove air bubbles in the oil storage tank and increase the fuel flow rate for circulation to remove air bubbles in the pipeline, which reduces the test efficiency.
[0007] Therefore, a degassing device or equipment is needed to eliminate or reduce air bubbles in the fuel system during aero-engine combustion chamber testing, in order to improve testing efficiency. Summary of the Invention
[0008] The purpose of this application is to provide a low-flow-resistance fuel degassing device for testing aircraft engine combustors, in order to solve or mitigate at least one of the problems in the prior art.
[0009] The technical solution of this application is: a low-flow-resistance fuel degassing device for aircraft engine combustion chamber testing, comprising:
[0010] The cylinder has an upper cover plate and a lower cover plate connected to its upper and lower ends, respectively. The upper cover plate is provided with an oil inlet and an exhaust device, and the lower cover plate is provided with an oil outlet.
[0011] A baffle plate is disposed inside the cylinder to form an annular channel for fuel flow inside the cylinder.
[0012] An oil separator cone is disposed inside the cylinder and located at the bottom of the guide plate. The oil separator cone divides the interior of the cylinder into upper and lower parts. The upper part is used to form an annular channel for fuel flow, and the lower part is used to form a fuel storage tank. The edge of the oil separator cone has multiple circumferentially distributed notches. Fuel flowing into the annular channel at the edge of the oil separator cone flows into the fuel storage tank through the notches.
[0013] The float is located inside the innermost guide plate, and a venting rod extending in the height direction is provided at the center of the float. The upper and lower ends of the venting rod are at least partially inserted into the fuel tank and the venting device, respectively. When the fuel level reaches the position of the float, the float moves under the guidance of the venting rod and blocks the venting device.
[0014] In at least one embodiment of this application, the exhaust device and the oil outlet are arranged along the axis of the cylinder.
[0015] In at least one embodiment of this application, the guide vanes include at least two, thereby forming at least two annular channels inside the cylinder.
[0016] In at least one embodiment of this application, a guide slope is provided between two adjacent guide plates or between the guide plate and the cylinder body to guide the fuel injected into the cylinder body through the oil inlet.
[0017] In at least one embodiment of this application, the guide slope forms a predetermined angle with the cross-sectional diameter of the cylinder, the predetermined angle being 15° to 30°.
[0018] In at least one embodiment of this application, the distance between the guide slope and the oil outlet is 5mm to 10mm.
[0019] In at least one embodiment of this application, the height of the middle part of the oil separator cone is higher than the height of its edge.
[0020] In at least one embodiment of this application, the vent rod is a hollow structure, which can exhaust the air in the oil storage tank below the oil separator cone to the exhaust device.
[0021] In at least one embodiment of this application, the exhaust device is provided with a sounding chamber structure. When the vent rod exhausts air from the oil tank to the exhaust device, the sounding chamber structure of the exhaust device produces a sound.
[0022] The degassing device of this application does not increase the resistance to fuel flow throughout the entire process, has no impact on the fuel system, and can effectively remove air from the fuel system. It has a simple and compact structure, requires no special maintenance or upkeep, and has strong environmental adaptability. It can be applied to any type of high-temperature or low-temperature fuel, improve the reliability of test data, save test costs, and shorten the development cycle. Attached Figure Description
[0023] 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.
[0024] Figure 1 This is a schematic diagram of the low flow resistance fuel degassing device for testing aero-engine combustion chambers according to this application.
[0025] Figure 2 This is a cross-sectional view of the low flow resistance fuel degassing device for testing aero-engine combustion chambers according to this application.
[0026] Figure 3 This is a schematic diagram of the exhaust device structure of this application. Detailed Implementation
[0027] 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.
[0028] This application provides a low-flow-resistance fuel degassing device for aero-engine combustion chamber testing. By setting a reasonable air exhaust structure, it can effectively remove air bubbles in the fuel system, reduce factors affecting test success, adapt to all test conditions, reduce test costs, and improve test efficiency.
[0029] like Figures 1 to 3 As shown, the low flow resistance fuel degassing device for aero-engine combustion chamber testing of this application includes: a cylinder 1, an upper cover plate 2, a lower cover plate 3, a guide plate 4, an oil separator cone 5, and a float 6.
[0030] The cylinder 1 constitutes the shell structure of the degassing device, and it can be rectangular or circular, etc. In this embodiment of the application, the cylinder 1 is circular in shape.
[0031] The upper cover plate 2 and the lower cover plate 3 are fixedly connected to the upper and lower openings of the cylinder 1 by bolts, thereby forming a closed receiving space inside the cylinder 1. The upper cover plate 2 is provided with an oil inlet 21 and an exhaust device 22, and the lower cover plate 3 is provided with an oil outlet 31. In some embodiments of this application, the exhaust device 22 and the oil outlet 31 are arranged along the axis of the cylinder 1, while the oil inlet 21 is arranged around the exhaust device 22.
[0032] A guide vane 4 is disposed inside the cylinder 1, forming an annular channel for fuel flow within the cylinder 1. In a preferred embodiment of this application, at least two guide vanes 4 are included, thereby forming at least two annular channels inside the cylinder 1. A guide ramp 44 is provided between adjacent guide vanes or between the guide vane and the cylinder 1 to guide the fuel injected into the cylinder 1 through the fuel inlet 21. The following embodiments of this application illustrate this. Figure 2 Taking the three guide plates shown as an example, the guide plate 4 includes an inner guide plate 41, a middle guide plate 42, and an outer guide plate 43. The inner guide plate 41, the middle guide plate 42, and the outer guide plate 43 are arranged outward in sequence with the axis of the cylinder 1 as the center, thereby forming a first annular channel between the inner guide plate 41 and the middle guide plate 42, a second annular channel between the middle guide plate 42 and the outer guide plate 43, and a third annular channel between the outer guide plate 43 and the cylinder 1. At the same time, there are guide slopes 44 between the inner guide plate 41 and the middle guide plate 42, between the middle guide plate 42 and the outer guide plate 43, and between the outer guide plate 43 and the cylinder 1. The circumferential positions and / or angles of the multiple guide slopes 44 are the same.
[0033] In a preferred embodiment of this application, the guide slope 44 forms a predetermined angle with the cross-sectional diameter of the cylinder 1, which is configured to be 15°~30°, thereby efficiently forming a thin oil layer on the guide slope 4. Furthermore, the distance between the guide slope 44 and the oil outlet 21 is configured to be 5mm~10mm.
[0034] The oil separator cone 5 is located inside the cylinder 1 and at the bottom of the guide plate 4. The oil separator cone 5 divides the interior of the cylinder 1 into upper and lower parts. The upper part forms an annular channel for fuel flow, and the lower part forms a fuel storage tank. The guide plates 4 are all semi-circular structures, and their height increases sequentially from the inside out. The oil separator cone 5 is fixedly connected to the cylinder 1 and the guide plates 4, for example, by welding. The edge of the oil separator cone 5 has multiple circumferentially distributed notches 51, with the height of the center being higher than the height of the edge. Thus, fuel in the third annular channel formed by the outer guide plate 43 and the cylinder 1 can flow through the notches 51 to the fuel storage tank at the bottom of the oil separator cone 5.
[0035] The float 6 is located inside the innermost guide plate 4 (i.e., inner guide plate 41). A venting rod 61 extending vertically is located at the center of the float 6. The upper and lower ends of the venting rod 61 are at least partially inserted into the fuel tank below the oil separator cone 5 and the venting device 22, respectively. When the fuel level reaches the position of the float 6, the float 6 can move under the guidance of the venting rod 61. The venting rod 61 is a hollow structure and is fixed to the float 6 by welding. Air or air bubbles in the fuel at the bottom of the oil separator cone 5 are discharged along the venting rod 61.
[0036] The working process of the fuel degassing device in this application is as follows:
[0037] 1) After the fuel enters through the fuel inlet 21, it is discharged from the fuel injector on the fuel inlet 21. The fuel is sprayed at a preset angle onto the guide slope 44 between the inner guide plate 41 and the middle guide plate 42 for interception, thereby forming a thin oil layer on the guide slope 44.
[0038] 2) After that, the fuel flows along the first annular channel, the second annular channel and the third annular channel formed by the inner guide plate 41, the middle guide plate 42 and the outer guide plate 43, and finally flows onto the oil separator cone 5. It then flows along the cylinder wall through the notch 51 on the oil separator cone 5 to the lower cavity of the oil separator cone 5.
[0039] 3) As the amount of fuel in the lower part of the cylinder 1 increases, air is discharged to the exhaust device 22 through the vent rod 61 in the center of the float 6. The exhaust device 22 is designed with a sounding chamber structure. When the air in the cylinder 1 is discharged through the vent rod 61, the exhaust device 22 will sound continuously. As the amount of fuel in the cylinder 1 continues to increase, when the fuel level reaches above the notch 51 of the oil separator cone 5, the float 6 will rise under the buoyancy of the fuel. When the vent rod 61 on the float 6 rises to the fixed position at the lower end of the exhaust device 22, the exhaust port of the exhaust device 22 is blocked, and the sounding stops. At this time, the fuel supply of the fuel degassing device stops, and the fuel in the fuel degassing device is relatively pure. At this time, the fuel can be discharged from the fuel outlet 31, thereby effectively removing air bubbles from the fuel system.
[0040] The degassing device of this application does not increase the resistance to fuel flow throughout the entire process, has no impact on the fuel system, and can effectively remove air from the fuel system. It has a simple and compact structure, requires no special maintenance or upkeep, and has strong environmental adaptability. It can be applied to any type of high-temperature or low-temperature fuel, improve the reliability of test data, save test costs, and shorten the development cycle.
[0041] 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 low-flow-resistance fuel degassing device for testing aero-engine combustion chambers, characterized in that, include: The cylinder (1) has an upper cover plate (2) and a lower cover plate (3) connected to its upper and lower ends respectively. The upper cover plate (2) is provided with an oil inlet (21) and an exhaust device (22), and the lower cover plate (3) is provided with an oil outlet (31). A guide plate (4) is disposed inside the cylinder (1) to form an annular channel for fuel flow inside the cylinder (1); An oil separator cone (5) is set inside the cylinder (1) and located at the bottom of the guide plate (4). The oil separator cone (5) divides the interior of the cylinder (1) into upper and lower parts. The upper part is used to form an annular channel for fuel flow, and the lower part is used to form a fuel storage tank. The edge of the oil separator cone (5) is provided with multiple circumferentially distributed notches (51). Fuel flowing into the annular channel at the edge of the oil separator cone (5) flows into the fuel storage tank through the notches (51). The float (6) is located inside the innermost guide plate (4), and the center of the float (6) is provided with a venting rod (61) extending in the height direction. The upper and lower ends of the venting rod (61) are at least partially inserted into the oil tank and the exhaust device (22). When the fuel level reaches the position of the float (6), the float (6) moves under the guidance of the venting rod (61) and blocks the exhaust device (22).
2. The low-flow-resistance fuel degassing device for aero-engine combustion chamber testing as described in claim 1, characterized in that, The exhaust device (22) and the oil outlet (31) are arranged along the axis of the cylinder (1).
3. The low-flow-resistance fuel degassing device for aero-engine combustion chamber testing as described in claim 1, characterized in that, The guide plate (4) includes at least two, thereby forming at least two annular channels inside the cylinder (1).
4. The low-flow-resistance fuel degassing device for aero-engine combustion chamber testing as described in claim 3, characterized in that, A guide slope (44) is provided between two adjacent guide plates or between the guide plate and the cylinder (1) to guide the fuel injected into the cylinder (1) through the oil inlet (21).
5. The low-flow-resistance fuel degassing device for aero-engine combustion chamber testing as described in claim 4, characterized in that, The guide slope (44) forms a predetermined angle with the cross-sectional diameter of the cylinder (1), and the predetermined angle is 15°~30°.
6. The low-flow-resistance fuel degassing device for aero-engine combustion chamber testing as described in claim 4 or 5, characterized in that, The distance between the guide slope (44) and the oil outlet (21) is 5mm~10mm.
7. The low-flow-resistance fuel degassing device for aero-engine combustion chamber testing as described in claim 1, characterized in that, The height of the middle part of the oil separator cone (5) is higher than the height of the edge.
8. The low-flow-resistance fuel degassing device for aero-engine combustion chamber testing as described in claim 1, characterized in that, The vent rod (61) has a hollow structure, which can exhaust the air in the oil storage tank on the lower side of the oil separator cone (5) to the exhaust device (22).
9. The low-flow-resistance fuel degassing device for aero-engine combustion chamber testing as described in claim 8, characterized in that, The exhaust device (22) has a sound chamber structure inside. When the vent rod (61) exhausts the air in the oil tank to the exhaust device (22), the sound chamber structure of the exhaust device (22) produces a sound.