A fan-shaped duty stabilizer and its oil supply method

Abstract

The present application belongs to the field of aircraft engine design, and particularly relates to a fan-shaped duty stabilizer and a fuel supply method thereof, comprising an afterburner casing; a plurality of radial stabilizers circumferentially mounted on the inner wall of the afterburner casing, wherein the root of the radial stabilizer is mounted on the inner wall surface of the afterburner casing, and the tip of the radial stabilizer points to the center line of the afterburner casing; wherein each radial stabilizer has a cavity, wherein a main spray rod and an auxiliary spray rod are respectively mounted in the cavity, and the main spray rod and the auxiliary spray rod spray oil through nozzles on the side walls of the radial stabilizer; the main spray rod is connected to a main pipe for fuel supply; the auxiliary spray rod comprises a first group of auxiliary spray rods and a second auxiliary spray rod, wherein the first group of auxiliary spray rods is connected to a first auxiliary pipe for fuel supply, and the second auxiliary spray rod is connected to a second auxiliary pipe for fuel supply; the present application adjusts a plurality of fuel supply modes according to different fuel needs, so that the fuel supply proportion of the stabilizer in the entire flight envelope is within a very wide range.

Description

Technical Field

[0001] The present application belongs to the field of aircraft engine design, and in particular relates to a fan-shaped duty stabilizer and a fuel supply method thereof. Background Art

[0002] The afterburner of an aircraft engine is located at the rear of the rear casing of the low-pressure turbine. Its inlet airflow velocity is relatively high. At high altitudes and low speeds, the inlet airflow pressure is relatively low. It can be seen that the combustion conditions in the afterburner are relatively harsh. Therefore, the technology of organizing combustion is the most core technology in the design of afterburner. In order to ensure that the afterburner can burn stably, a duty stabilizer will be set up in most cases, and a special oil supply line will be designed for the duty stabilizer to ensure that the duty stabilizer can still stabilize the flame under harsh combustion conditions and has the ability to re-ignite fuel in other positions. Therefore, the duty stabilizer is the core of the entire stabilizer system. Normally, the duty stabilizer of the afterburner is a complete circular ring (its schematic diagram is shown in the figure). Figure 2 As shown), other stabilizers are reasonably arranged near the ring-shaped duty stabilizer.

[0003] With the development of aircraft engine technology, the inlet temperature of the afterburner is gradually increasing. Although this is beneficial to the organization of combustion, it also requires the air cooling design of the internal components of the afterburner (such as stabilizers and fuel supply pipelines, etc.), which requires the establishment of a special air cooling structure to cool the internal components. In order to reduce the design difficulty of the cooling system, it is considered that the fuel main pipe can be placed outside the afterburner casing, but in this case it is difficult to continue to use the traditional afterburner's annular duty stabilizer; such as Figure 3 As shown in the figure, this type of duty stabilizer is basically no longer applicable to afterburner combustion chambers with high inlet temperatures and afterburner fuel supply manifolds placed outside the casing. If a traditional annular duty stabilizer is designed in such afterburner combustion chambers, the problem of limited assembly space and difficult cooling system design will be encountered. The flame coverage area of ​​the traditional annular duty stabilizer is as follows: Figure 4 shown. Summary of the invention

[0004] In order to solve the above problems, the present application provides a fan-shaped duty stabilizer, comprising:

[0005] afterburner casing;

[0006] A plurality of radial stabilizers are circumferentially mounted on the inner wall of the afterburner casing, wherein the root of the radial stabilizer is mounted on the inner wall of the afterburner casing, and the tip of the radial stabilizer points to the center line of the afterburner casing;

[0007] Each radial stabilizer has a cavity, and a main spray bar and a secondary spray bar are respectively installed in the cavity, and the main spray bar and the secondary spray bar spray oil through nozzles on the side wall of the radial stabilizer;

[0008] The main spray bar is connected to a main pipe for oil supply;

[0009] The auxiliary spray rods include a first group of auxiliary spray rods and a second auxiliary spray rod, the first group of auxiliary spray rods are connected to a first auxiliary pipe for oil supply, and the second auxiliary spray rods are connected to a second auxiliary pipe for oil supply; the first group of auxiliary spray rods include auxiliary spray rods of radial stabilizers in a fan-shaped area with a preset angular position and a preset circumferential angle.

[0010] Preferably, the preset circular angle is less than 180 degrees.

[0011] Preferably, an annular flame transmission groove is connected between adjacent radial stabilizers, and the flame transmission groove has a through groove, and the through groove is connected to the cavity.

[0012] Preferably, the main pipe, the second auxiliary pipe and the first auxiliary pipe are placed on the outer wall surface of the afterburner casing, the root of the main nozzle rod passes through the afterburner casing to be connected to the main pipe, the root of the first group of auxiliary nozzle rods passes through the afterburner casing to be connected to the first auxiliary pipe, and the root of the second auxiliary nozzle rod passes through the afterburner casing to be connected to the second auxiliary pipe.

[0013] Preferably, the afterburner casing has a through hole connected to the cavity, and the trailing edge of the radial stabilizer has an exhaust hole connected to the cavity, the through hole introduces the external gas on the outside of the afterburner casing into the cavity, and the external gas is discharged from the exhaust hole.

[0014] A method for supplying oil to a sector-shaped duty stabilizer, the method being used for supplying oil to the sector-shaped duty stabilizer.

[0015] During the ignition stage, the first auxiliary pipe supplies oil to the first group of auxiliary spray rods, igniting the fuel in the fan-shaped area; the flame spreads from the fan-shaped area to both sides along the circumferential direction;

[0016] When the total fuel volume is less than the preset value, the first auxiliary pipe supplies fuel to the first group of auxiliary spray bars, and the second auxiliary pipe supplies fuel to the second group of auxiliary spray bars;

[0017] When the total fuel volume is greater than the preset value, the first auxiliary pipe supplies fuel to the first group of auxiliary spray bars, the second auxiliary pipe supplies fuel to the second group of auxiliary spray bars, and the main pipe supplies fuel to the main spray bar;

[0018] When the oil supply is cut off, the first auxiliary pipe is the last to be cut off.

[0019] Advantages of this application include:

[0020] 1. The present application first designs a radial stabilizer, and selects a preset angle area at a preset angular position of the radial stabilizer as a fan-shaped duty stabilizer. The fan-shaped duty stabilizer first sprays oil before ignition and last sprays oil after flameout. The amount of duty oil spray can be changed by changing the size of the selected fan-shaped area;

[0021] 2. The present application sets up two types of fuel injection pipes and three types of fuel circuits. According to different fuel needs, various fuel supply methods are adjusted, so that the fuel supply ratio of the stabilizer in the entire flight envelope is within a very wide range.

[0022] 3. The present application is provided with an annular flame transfer groove, which forms an annular reflow zone to facilitate uniform combustion in the afterburner;

[0023] 4. The radial stabilizer has a cavity, which introduces the outer gas and discharges it through the exhaust hole. On the one hand, it can cool the injection rod through the outer gas, and on the other hand, it can mix the fuel at the trailing edge of the radial stabilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the connection between the radial stabilizer and the afterburner casing of the present application;

[0025] Figure 2 It is a schematic diagram of a sector duty stabilizer;

[0026] Figure 3 It is a schematic diagram of a sector duty stabilizer;

[0027] Figure 4 It is a schematic diagram of a traditional ring duty stabilizer;

[0028] Figure 5 This is a schematic diagram of the flame coverage area of ​​a traditional annular duty stabilizer. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the implementation of this application will be described in more detail in combination with the drawings in the implementation of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and cannot be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in combination with the drawings.

[0030] like Figure 1-Figure 3 As shown,

[0031] The present application provides a sector-shaped duty stabilizer, comprising:

[0032] Afterburner casing 1;

[0033] A plurality of radial stabilizers 2 are circumferentially mounted on the inner wall of the afterburner casing 1, wherein the root of the radial stabilizer 2 is mounted on the inner wall of the afterburner casing 1, and the tip of the radial stabilizer 2 points to the center line of the afterburner casing 1;

[0034] Each radial stabilizer 2 has a cavity, and a main spray bar and a secondary spray bar are respectively installed in the cavity, and the main spray bar and the secondary spray bar spray oil through nozzles on the side wall of the radial stabilizer 2;

[0035] The main spray bar is connected to a main pipe for oil supply;

[0036] The auxiliary spray rods include a first group of auxiliary spray rods and a second auxiliary spray rod, the first group of auxiliary spray rods are connected to a first auxiliary pipe for oil supply, and the second auxiliary spray rods are connected to a second auxiliary pipe for oil supply; the first group of auxiliary spray rods include auxiliary spray rods of the radial stabilizer 2 in a fan-shaped area at a preset angular position and a preset circumferential angle, and the fan-shaped area is first supplied with oil during the ignition stage, and then the fuel in the area is ignited, and the flame propagates circumferentially from the angular direction to both sides.

[0037] Preferably, the preset circular angle is less than 180 degrees; the fan-shaped area is a fan-shaped duty stabilizer, the size of the preset circular angle determines the size of the fan-shaped area, the size of the fan-shaped area determines how many auxiliary spray bars the fan-shaped area includes, that is, the number of the first group of auxiliary spray bars, and also determines the amount of fuel injection when on duty.

[0038] Preferably, an annular flame transfer groove 3 is connected between adjacent radial stabilizers 2, and the flame transfer groove 3 has a through groove, which is connected to the cavity, and the trailing edge of the annular flame transfer groove 3 can form an annular recirculation zone, which is conducive to oil and gas mixing and combustion.

[0039] Preferably, the main pipe, the second auxiliary pipe and the first auxiliary pipe are placed on the outer wall of the afterburner casing 1, the root of the main spray rod passes through the afterburner casing 1 to be connected to the main pipe, the root of the first group of auxiliary spray rods passes through the afterburner casing 1 to be connected to the first auxiliary pipe, and the root of the second auxiliary spray rod passes through the afterburner casing 1 to be connected to the second auxiliary pipe; that is to say, the oil supply pipeline of the fan-shaped duty stabilizer is placed outside the afterburner casing, and the spray rod is arranged inside the stabilizer, which can avoid designing a special cooling device for the oil supply pipeline, and at the same time avoid the problems of increased structural weight and reduced structural reliability caused by the cooling system; at the same time, the oil supply main pipe and auxiliary pipes in the fan-shaped duty area can be put together to form a whole ring, that is, three oil supply pipelines are arranged in a whole ring space. For the entire afterburner, when the number of oil supply main pipes is the same, the installation space of a circle of ring pipes can be saved, which is beneficial to both engine weight reduction and the arrangement of external pipelines.

[0040] Preferably, the afterburner casing 1 has a through hole connected to the cavity, and the trailing edge of the radial stabilizer 2 has an exhaust hole connected to the cavity, the through hole introduces the outer gas of the afterburner casing 1 into the cavity, and the outer gas is discharged from the exhaust hole.

[0041] A method for supplying oil to a sector-shaped duty stabilizer, the method being used for supplying oil to the sector-shaped duty stabilizer.

[0042] During the ignition stage, the first auxiliary pipe supplies oil to the first group of auxiliary spray rods, igniting the fuel in the fan-shaped area; the flame spreads from the fan-shaped area to both sides along the circumferential direction;

[0043] When the total fuel volume is less than the preset value, the first auxiliary pipe supplies fuel to the first group of auxiliary spray bars, and the second auxiliary pipe supplies fuel to the second group of auxiliary spray bars;

[0044] When the total fuel volume is greater than the preset value, the first auxiliary pipe supplies fuel to the first group of auxiliary spray bars, the second auxiliary pipe supplies fuel to the second group of auxiliary spray bars, and the main pipe supplies fuel to the main spray bar;

[0045] When the oil supply is cut off, the first auxiliary pipe is the last to be cut off;

[0046] The specific ignition oil quantity of the present application can be controlled by the oil supply law, so that the oil supply ratio of the duty stabilizer in the entire flight envelope is within a very wide range, which is conducive to ignition with different ignition oil-gas ratios in the envelope to improve the ignition reliability in the entire envelope. The traditional annular duty stabilizer only supplies oil in a single oil circuit, so the adjustment range of the ignition oil quantity in the entire envelope is very limited, which will make the ignition reliability of the high-altitude low speed state point relatively low.

[0047] The flame coverage area of ​​the sector watch stabilizer is as follows Figure 3 As shown, it is a fan-shaped area. The flame coverage area of ​​the traditional annular watch stabilizer is as follows Figure 5As shown in the figure, it can be seen that the coverage area of ​​the fan-shaped duty stabilizer flame is significantly larger than that of the circular duty stabilizer flame, which is about 1.3 times the coverage area of ​​the circular duty flame. In addition, the flame in the fan-shaped area is relatively more concentrated, and the ability of the flames between adjacent stabilizers to support each other during the ignition process is also stronger. It can be seen that the flame stabilization ability of the fan-shaped duty stabilizer is better than that of the traditional circular duty stabilizer.

[0048] Advantages of this application include:

[0049] 1. The present application first designs a radial stabilizer, and selects a preset angle area at a preset angular position of the radial stabilizer as a fan-shaped duty stabilizer. The fan-shaped duty stabilizer first sprays oil before ignition and last sprays oil after flameout. The amount of duty oil spray can be changed by changing the size of the selected fan-shaped area;

[0050] 2. The present application sets up two types of fuel injection pipes and three types of fuel circuits. According to different fuel needs, various fuel supply methods are adjusted, so that the fuel supply ratio of the stabilizer in the entire flight envelope is within a very wide range.

[0051] 3. The present application is provided with an annular flame transfer groove, which forms an annular reflow zone to facilitate uniform combustion in the afterburner;

[0052] 4. The radial stabilizer has a cavity, which introduces the outer gas and discharges it through the exhaust hole. On the one hand, it can cool the injection rod through the outer gas, and on the other hand, it can mix the fuel at the trailing edge of the radial stabilizer.

[0053] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A fan-shaped duty stabilizer, It is characterized in that include: Afterburner casing (1); A plurality of radial stabilizers (2) circumferentially mounted on the inner wall of the afterburner casing (1); Each radial stabilizer (2) has a cavity, a main spray bar and a secondary spray bar are respectively installed in the cavity, and the main spray bar and the secondary spray bar spray oil through nozzles on the side wall of the radial stabilizer (2); The main spray bar is connected to a main pipe for oil supply; The auxiliary spray rods include a first group of auxiliary spray rods and a second auxiliary spray rod, the first group of auxiliary spray rods are connected to a first auxiliary pipe for oil supply, and the second auxiliary spray rods are connected to a second auxiliary pipe for oil supply; the first group of auxiliary spray rods include auxiliary spray rods of a radial stabilizer (2) in a fan-shaped area at a preset angular position and a preset circumferential angle, and the angle of the preset circumferential angle is less than 180 degrees.

2. The sector-shaped duty stabilizer as claimed in claim 1, It is characterized in that An annular flame transmission groove (3) is connected between adjacent radial stabilizers (2), and the flame transmission groove (3) has a through groove, and the through groove is connected to the cavity.

3. The fan-shaped duty stabilizer as claimed in claim 1, It is characterized in that The main pipe, the second auxiliary pipe and the first auxiliary pipe are placed on the outer wall surface of the afterburner casing (1); the root of the main spray rod passes through the afterburner casing (1) to be connected to the main pipe; the root of the first group of auxiliary spray rods passes through the afterburner casing (1) to be connected to the first auxiliary pipe; the root of the second auxiliary spray rod passes through the afterburner casing (1) to be connected to the second auxiliary pipe.

4. The sector-shaped duty stabilizer according to claim 1, It is characterized in that The afterburner casing (1) has a through hole connected to the cavity, and the trailing edge of the radial stabilizer (2) has an exhaust hole connected to the cavity. The through hole introduces the outer gas of the afterburner casing (1) into the cavity, and the outer gas is discharged from the exhaust hole.

5. A method for supplying oil to a sector-shaped duty stabilizer, the method being used for supplying oil to the sector-shaped duty stabilizer according to any one of claims 1 to 4, It is characterized in that During the ignition phase, the first auxiliary pipe supplies fuel to the first group of auxiliary spray rods, igniting the fuel in the fan-shaped area; The flame spreads circumferentially from the fan-shaped area to both sides; When the total fuel volume is less than the preset value, the first auxiliary pipe supplies fuel to the first group of auxiliary spray bars, and the second auxiliary pipe supplies fuel to the second group of auxiliary spray bars; When the total fuel volume is greater than the preset value, the first auxiliary pipe supplies fuel to the first group of auxiliary spray bars, the second auxiliary pipe supplies fuel to the second group of auxiliary spray bars, and the main pipe supplies fuel to the main spray bar; When the oil supply is cut off, the first auxiliary pipe is the last to be cut off.

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