A fuel supply device for a reheat combustor

Abstract

The application belongs to the field of turbojet afterburner, and particularly relates to an afterburner oil supply device. The oil supply device comprises: an oil supply main body, an oil flow channel is formed in the oil supply main body, the oil flow channel comprises two or more oil flow channel sections which are sequentially communicated, an inlet of one of the oil flow channel sections is communicated with an oil supply pipeline, a plurality of oil injection holes are formed in the oil supply main body, and the oil injection holes are communicated with corresponding oil flow channel sections; and oil supply assemblies which are one-to-one corresponding to the oil flow channel sections, each oil supply assembly is arranged in a corresponding oil flow channel section. The application can match the radial partition oil supply and combustion requirements of the afterburner, provide better oil-gas mixing and combustion effects of the afterburner, and has a more flexible structure design, so that more fine fuel injection control and more accurate oil-gas matching effects can be realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of aircraft engine afterburner, and particularly relates to an afterburner oil supply device. BACKGROUND

[0002] Aircraft engines are developing towards higher thrust-to-weight ratio and lower fuel consumption, and accordingly, afterburners need to provide higher combustion efficiency, lower total pressure loss and higher outlet temperature. For this purpose, engineering and technical personnel have adopted many measures to improve the combustion performance of afterburners. For example, in terms of structure: arranging multiple circumferential oil injection rings or multiple radial oil injection rods; in terms of oil supply strategy: adopting zoned and pressure-divided oil supply, taking into account the needs of different state points for fuel pressure and oil supply quantity, and ensuring the oil-gas matching needs of each region of the afterburner.

[0003] Multi-path oil supply, zoned and pressure-divided oil supply, and local swirl combustion and other measures ensure the needs of fuel and air mixing and combustion of existing type afterburners to varying degrees. However, the improvement of overall performance indicators not only improves the aerodynamic and thermal performance indicators of the afterburner, but also makes the combustion organization of the afterburner more difficult. For example, radial oil injection rods are difficult to ensure that nozzles at different positions can provide appropriate fuel spray penetration depth and reasonable oil supply quantity; a larger flight envelope makes it difficult to balance the contradiction between oil supply quantity and fuel pressure at different state points for zoned and pressure-divided oil supply. Therefore, it is urgent to design a new afterburner oil supply device to ensure oil-gas matching needs and provide higher combustion temperature.

[0004] Therefore, there is an urgent need for a technical solution to overcome or alleviate at least one of the aforementioned deficiencies of the prior art. SUMMARY

[0005] The purpose of the present application is to provide an afterburner oil supply device to solve at least one problem existing in the prior art.

[0006] The technical solution of the present application is:

[0007] An afterburner oil supply device, comprising:

[0008] An oil supply main body, an oil flow channel is formed in the oil supply main body, the oil flow channel comprises two or more oil flow channel segments that are sequentially connected, an inlet of one of the oil flow channel segments is in communication with an oil supply pipeline, a plurality of oil injection holes are formed in the oil supply main body, and the oil injection holes are in communication with corresponding oil flow channel segments;

[0009] An oil supply assembly, the oil supply assembly corresponds to the oil flow channel segments one by one, and each oil supply assembly is arranged in a corresponding oil flow channel segment;

[0010] The oil supply assembly comprises:

[0011] a spring positioning plate fixedly installed on the oil supply body of the corresponding fuel flow channel section;

[0012] a one-way valve provided at the inlet of the corresponding fuel flow channel section, the one-way valve being provided with a one-way valve spring connected with the spring positioning plate;

[0013] a flow limiting valve provided in the corresponding fuel flow channel section, the flow limiting valve being provided with a flow limiting valve spring connected with the spring positioning plate;

[0014] a flow limiting valve limiter fixedly installed on the oil supply body of the corresponding fuel flow channel section for limiting the flow limiting valve.

[0015] In at least one embodiment of the present application, the fuel flow channel section comprises:

[0016] an inlet section with a size smaller than that of the one-way valve;

[0017] a one-way valve containing section for containing the one-way valve;

[0018] a flow limiting valve containing section for containing the flow limiting valve, the flow limiting valve containing section having a size equal to that of the flow limiting valve;

[0019] a flow limiting valve limiting section for limiting the flow limiting valve, the flow limiting valve limiting section having a size greater than that of the flow limiting valve.

[0020] In at least one embodiment of the present application, the spring positioning plate is arranged at the connection between the one-way valve containing section and the flow limiting valve containing section.

[0021] In at least one embodiment of the present application, the fuel injection hole is arranged multiple times along two opposite sides of the oil supply body.

[0022] In at least one embodiment of the present application, a stabilizing trailing edge is arranged behind the fuel injection hole along the axial flow direction of the inner-duct airflow of the afterburner.

[0023] In at least one embodiment of the present application, the fuel flow channel comprises a first fuel flow channel section and a second fuel flow channel section, and the oil supply assembly comprises a first oil supply assembly and a second oil supply assembly, the first oil supply assembly being arranged in the first fuel flow channel section, and the second oil supply assembly being arranged in the second fuel flow channel section.

[0024] In at least one embodiment of the present application, the oil supply device has a first working state, a second working state and a third working state.

[0025] In the first working state:

[0026] The afterburner is not working, no fuel enters the fuel flow channel, the check valve is in the closed state under the action of the check valve spring, and the restrictor valve is retracted in the initial position under the action of the restrictor valve spring;

[0027] In the second working state:

[0028] The afterburner is working, fuel enters the first fuel flow channel section, the check valve in the first fuel flow channel section is pushed open under the action of fuel pressure, the check valve spring is compressed, fuel flows along the first fuel flow channel section to the restrictor valve, pushes the restrictor valve, and the restrictor valve spring is stretched;

[0029] In the third working state:

[0030] The afterburner is working, fuel enters the first fuel flow channel section, the check valve in the first fuel flow channel section is pushed open under the action of fuel pressure, the check valve spring is compressed, fuel flows along the first fuel flow channel section to the restrictor valve, pushes the restrictor valve, and the restrictor valve spring is stretched; fuel enters the second fuel flow channel section, the check valve in the second fuel flow channel section is pushed open under the action of fuel pressure, the check valve spring is compressed, fuel flows along the second fuel flow channel section to the restrictor valve, pushes the restrictor valve, and the restrictor valve spring is stretched.

[0031] The present application has at least the following technical effects:

[0032] The afterburner fuel supply device of the present application can match the radial partition fuel supply and combustion requirements of the afterburner, provide better afterburner oil-gas mixing and combustion effect, and has a more flexible structure design, which can realize more precise fuel injection control and more precise oil-gas matching effect. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a side view of the afterburner fuel supply device of an embodiment of the present application;

[0034] Figure 2 is a side view of the afterburner fuel supply device of an embodiment of the present application;

[0035] Figure 3 is a front view of the afterburner fuel supply device of an embodiment of the present application;

[0036] Figure 4 is a side view of the afterburner fuel supply device of an embodiment of the present application;

[0037] Figure 5 is a lateral sectional view of the fuel supply device of the afterburner in the second working state according to an embodiment of the present application;

[0038] Figure 6 is a lateral sectional view of the fuel supply device of the afterburner in the third working state according to an embodiment of the present application.

[0039] wherein:

[0040] 1 - fuel injection hole; 2 - stable trailing edge; 3 - one-way valve; 4 - one-way valve spring; 5 - flow limiting valve; 6 - flow limiting valve spring; 7 - flow limiting valve limiter; 8 - fuel flow channel. DETAILED DESCRIPTION

[0041] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are some of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0043] The drawings will be described below in conjunction with the Figures 1 to 6 The present application will be described in further detail.

[0044] The present application provides a fuel supply device of an afterburner, comprising: a fuel supply body and a fuel supply assembly.

[0045] Specifically, a fuel flow channel 8 is formed in the fuel supply body, the fuel flow channel 8 comprises two or more fuel flow channel segments which are sequentially communicated, an inlet of one of the fuel flow channel segments is communicated with a fuel supply pipeline, a plurality of fuel injection holes 1 are formed on the fuel supply body, and the fuel injection holes 1 are communicated with corresponding fuel flow channel segments.

[0046] The oil supply assembly is equal in number to the fuel flow channel segments, and the two are one-to-one corresponding, and each oil supply assembly is arranged in the corresponding fuel flow channel segment. The oil supply assembly includes a spring positioning plate, a one-way valve 3, a one-way valve spring 4, a flow limiting valve 5, a flow limiting valve spring 6, and a flow limiting valve limiter 7.

[0047] The spring positioning plate is fixedly installed on the oil supply body of the corresponding fuel flow channel segment, and is used to position one end of the one-way valve spring 4 and the flow limiting valve spring 6. The one-way valve 3 is arranged at the inlet of the corresponding fuel flow channel segment, one end of the one-way valve spring 4 is connected with the one-way valve 3, and the other end of the one-way valve spring 4 is connected with the spring positioning plate. The fuel flows in from the inlet of the fuel flow channel segment, and the one-way valve 3 moves towards the spring positioning plate under the action of the fuel pressure, and the inlet of the fuel flow channel segment is opened.

[0048] The flow limiting valve 5 is arranged in the corresponding fuel flow channel segment, one end of the flow limiting valve spring 6 is connected with the flow limiting valve 5, and the other end of the flow limiting valve spring 6 is connected with the spring positioning plate. The flow limiting valve limiter 7 is fixedly installed on the oil supply body of the corresponding fuel flow channel segment, and is used to limit the flow limiting valve 5. The fuel flows in the fuel flow channel segment, and the flow limiting valve 5 moves away from the spring positioning plate under the action of the fuel pressure, until it is limited by the flow limiting valve limiter 7.

[0049] The force augmentation combustion chamber oil supply device of the present application, each fuel flow channel segment in turn includes: an inlet section, a one-way valve containing section, a flow limiting valve containing section and a flow limiting valve limiting section along the fuel flow direction. Among them, the size of the inlet section is smaller than the size of the one-way valve 3, so that the one-way valve 3 can block the inlet of the fuel flow channel segment; the one-way valve containing section is used to contain the one-way valve 3, when the fuel pressure reaches the opening pressure threshold, under the action of the fuel pressure, the one-way valve 3 can move in the one-way valve containing section, the inlet of the fuel flow channel segment is opened; the flow limiting valve containing section is used to contain the flow limiting valve 5, and the size of the flow limiting valve containing section is equal to the size of the flow limiting valve 5, when the fuel pressure reaches the first flow limiting pressure threshold, under the action of the fuel pressure, the flow limiting valve 5 can move in the flow limiting valve containing section; the flow limiting valve limiting section is used to limit the flow limiting valve 5, and the size of the flow limiting valve limiting section is greater than the size of the flow limiting valve 5, when the fuel pressure reaches the second flow limiting pressure threshold, under the action of the fuel pressure, the flow limiting valve 5 can move in the flow limiting valve limiting section, until it is limited by the flow limiting valve limiter 7. The flow limiting valve limiting section of the fuel flow channel segment is connected with the inlet section of the next fuel flow channel segment, when the flow limiting valve 5 is located in the flow limiting valve limiting section, the fuel in the flow limiting valve limiting section of the fuel flow channel segment can enter the inlet section of the next fuel flow channel segment, the next fuel flow channel segment is also supplied in the above-mentioned manner. In the preferred embodiment of the present application, the spring positioning plate is arranged at the connection between the one-way valve containing section and the flow limiting valve containing section.

[0050] In the preferred embodiment of the present application, asFigure 1 As shown in the figure, the fuel injection holes 1 are arranged in multiple along the two opposite sides of the fuel supply body. The fuel supply device further comprises a stabilizing trailing edge 2 arranged behind the fuel injection holes 1 along the axial flow direction of the inner-duct gas flow in the afterburner.

[0051] The afterburner fuel supply device of the present application, the number of fuel supply assemblies and fuel flow channel segments can be designed according to the radial dimension of the afterburner.

[0052] In an embodiment of the present application, as shown in Figure 2 and Figure 3 As shown in the figure, two fuel supply assemblies and two fuel flow channel segments are arranged, the fuel flow channel 8 comprises a first fuel flow channel segment and a second fuel flow channel segment, the inlet section of the first fuel flow channel segment is in communication with the fuel supply pipeline, the flow limiting valve limiting section of the first fuel flow channel segment is in communication with the inlet section of the second fuel flow channel segment; the fuel supply assembly comprises a first fuel supply assembly and a second fuel supply assembly, the first fuel supply assembly is arranged in the first fuel flow channel segment, and the second fuel supply assembly is arranged in the second fuel flow channel segment.

[0053] In the embodiment, the fuel supply device has a first working state, a second working state and a third working state.

[0054] As shown in Figure 4 in the first working state:

[0055] The afterburner is not working, there is no fuel entering the fuel flow channel 8, the one-way valve 3 is in the closed state under the action of the one-way valve spring 4, and the flow limiting valve 5 is retracted to the initial position under the action of the flow limiting valve spring 6.

[0056] In the first working state, the fuel supply device can avoid the problems of fuel boiling, coking, in-pipe spontaneous combustion or entering the main flow of the afterburner and spontaneous combustion caused by the remaining residual fuel entering the fuel flow channel 8 and the fuel injection holes 1.

[0057] As shown in Figure 5 in the second working state:

[0058] The afterburner is working, fuel enters the first fuel flow channel segment, the one-way valve 3 in the first fuel flow channel segment is pushed away under the action of the fuel pressure, the one-way valve spring 4 is compressed, the fuel flows along the first fuel flow channel segment to the flow limiting valve 5, pushing the flow limiting valve 5 and making the flow limiting valve spring 6 be stretched.

[0059] In the second working state, the fuel injection holes 1 with fuel flow start to inject fuel into the main flow of the afterburner, and the fuel is ignited by the pilot flame after passing through the backflow area behind the stable trailing edge 2. The corresponding radial area of the afterburner starts to work. It can be understood that, due to the influence of the flow limiting valve 5, the fuel flow of the fuel injection hole 1 at the end of the first fuel flow channel section is small, the injection pressure is low, and the fuel penetration depth is short, which can avoid the problem of interference of the fuel injection of the fuel injection hole 1 at a lower radial height.

[0060] As shown in Figure 6 the third working state:

[0061] The afterburner works, fuel enters the first fuel flow channel section, the one-way valve 3 in the first fuel flow channel section is pushed open under the action of fuel pressure, the one-way valve spring 4 is compressed, the fuel flows along the first fuel flow channel section to the flow limiting valve 5, pushes the flow limiting valve 5 and makes the flow limiting valve spring 6 be stretched; fuel enters the second fuel flow channel section, the one-way valve 3 in the second fuel flow channel section is pushed open under the action of fuel pressure, the one-way valve spring 4 is compressed, the fuel flows along the second fuel flow channel section to the flow limiting valve 5, pushes the flow limiting valve 5 and makes the flow limiting valve spring 6 be stretched.

[0062] In the third working state, when the fuel supply and fuel pressure reach the peak value, the corresponding one-way valve 3 of each fuel flow channel section is completely opened, the one-way valve spring 4 is compressed to the minimum, the flow limiting valve spring 6 is stretched to the maximum, the flow limiting valve 5 reaches the flow limiting valve limiter 7 and is stably pressed at this position by the fuel pressure, and all the fuel injection holes 1 of the fuel supply device are put into work. Therefore, the fuel entering the afterburner is ignited by the pilot flame in the backflow area after passing through the stable trailing edge 2, and all the radial combustion areas of the afterburner are also put into work. Due to the throttling effect of the one-way valve 3 and the flow limiting valve 5 in each fuel flow channel section, the flow resistance loss of the fuel flowing in each fuel flow channel section gradually increases. Therefore, the fuel injection amount of the fuel injection hole 1 at a lower radial height is smaller, and the fuel penetration depth is smaller. This fuel supply mode is well matched with the characteristics of the small fuel diffusion space and the small total amount of oxygen in the area close to the center axis of the afterburner, which ensures that the afterburner obtains more fine oil-gas mixing effect and the fuel is fully combusted.

[0063] The afterburner fuel supply device of the present application is closely related to the fuel supply and fuel pressure in the working state, the fuel injection conditions change timely with the fuel pressure, the fuel injection holes 1 at different radial positions can obtain more reasonable fuel injection amount and fuel penetration depth, which ensures effective fuel atomization, realizes more fine fuel injection control and more accurate oil-gas matching effect. At the same time, the number of afterburner fuel manifolds can be effectively reduced, the spatial arrangement difficulty of the afterburner fuel manifold and the complexity of the afterburner fuel supply pipeline are reduced.

[0064] The oil supply device of the afterburner of the application, according to the numerical simulation and model stage test results of the afterburner, show that the oil supply device can shorten the ignition delay time of the afterburner by 17%, improve the combustion efficiency by 6%, increase the total temperature of the afterburner outlet at the ground state point by 158 K, and expand the lean and rich oil ignition boundaries of the left and right boundaries at high altitude by 9% and 5% respectively. It can be seen that the afterburner oil supply device with oil supply and flame stabilization functions effectively improves the combustion performance indicators of the afterburner.

[0065] 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 scope disclosed in 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 fuel supply device for a reheat combustor, characterized by comprising: The application relates to a fuel supply device for a liquid rocket engine. The fuel supply device comprises: a fuel supply body, which is internally provided with fuel flow channels (8), the fuel flow channels (8) comprising two or more fuel flow channel sections which are sequentially communicated, wherein the inlet of one of the fuel flow channel sections is communicated with a fuel supply pipeline, and a plurality of fuel injection holes (1) are formed in the fuel supply body and communicated with the corresponding fuel flow channel sections; a fuel supply assembly corresponding to the fuel flow channel sections, each fuel supply assembly being arranged in the corresponding fuel flow channel section; wherein the fuel supply assembly comprises: a spring positioning plate, which is fixedly installed on the fuel supply body of the corresponding fuel flow channel section; a one-way valve (3), which is arranged at the inlet of the corresponding fuel flow channel section, and is provided with a one-way valve spring (4) connected with the spring positioning plate; a flow limiting valve (5), which is arranged in the corresponding fuel flow channel section, and is provided with a flow limiting valve spring (6) connected with the spring positioning plate; 2. The oil supply device for a reheat combustor according to claim 1, wherein a flow limiting valve limiter (7), which is fixedly installed on the fuel supply body of the corresponding fuel flow channel section, and is used for limiting the flow limiting valve (5). The fuel flow channel section comprises: an inlet section, which is smaller than the one-way valve (3); a one-way valve accommodating section, which is used for accommodating the one-way valve (3); a flow limiting valve accommodating section, which is used for accommodating the flow limiting valve (5) and has the same size as the flow limiting valve (5); 3. The oil supply arrangement for a reheat combustor as set forth in claim 2, characterized by a flow limiting valve limiting section, which is used for limiting the flow limiting valve (5) and has a size larger than that of the flow limiting valve (5).

4. The oil supply arrangement for a reheat combustor as set forth in claim 1, characterized by The spring positioning plate is arranged at the connection between the one-way valve accommodating section and the flow limiting valve accommodating section.

5. The oil supply arrangement for a thrust chamber as claimed in claim 4, characterized in that The fuel injection holes (1) are arranged on two opposite sides of the fuel supply body.

6. The oil supply arrangement for a reheat combustor as set forth in claim 1, characterized by A stabilizing trailing edge (2) is arranged behind the fuel injection holes (1) along the axial flow direction of the reheat combustion chamber.

7. The oil supply arrangement for a reheat combustor as set forth in claim 6, characterized by The fuel flow channels (8) comprise a first fuel flow channel section and a second fuel flow channel section, the fuel supply assembly comprises a first fuel supply assembly and a second fuel supply assembly, the first fuel supply assembly is arranged in the first fuel flow channel section, and the second fuel supply assembly is arranged in the second fuel flow channel section. The fuel supply device has a first working state, a second working state and a third working state. In the first working state: the reheat combustion chamber is not working, no fuel enters the fuel flow channels (8), the one-way valve (3) is in a closed state under the action of the one-way valve spring (4), and the flow limiting valve (5) is contracted to an initial position under the action of the flow limiting valve spring (6); in the second working state: The first fuel flow channel section is entered by fuel, the one-way valve (3) in the first fuel flow channel section is pushed open under the action of fuel pressure, the one-way valve spring (4) is compressed, fuel flows along the first fuel flow channel section to the flow limiting valve (5), the flow limiting valve (5) is pushed and the flow limiting valve spring (6) is stretched; In the third working state: The first fuel flow channel section is entered by fuel, the one-way valve (3) in the first fuel flow channel section is pushed open under the action of fuel pressure, the one-way valve spring (4) is compressed, fuel flows along the first fuel flow channel section to the flow limiting valve (5), the flow limiting valve (5) is pushed and the flow limiting valve spring (6) is stretched; the second fuel flow channel section is entered by fuel, the one-way valve (3) in the second fuel flow channel section is pushed open under the action of fuel pressure, the one-way valve spring (4) is compressed, fuel flows along the second fuel flow channel section to the flow limiting valve (5), the flow limiting valve (5) is pushed and the flow limiting valve spring (6) is stretched.

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