Flame stabilizer structure with central rotational flow generator

Abstract

The invention relates to the technical field of engine afterburners, in particular to a flame stabilizer structure with a central rotational flow generator, which comprises a plurality of stabilizer monomers annularly and uniformly distributed in a combustion chamber, and each stabilizer monomer comprises a sand dune stabilizer, and a rotational flow generator and a radial stabilizer which are arranged on the sand dune stabilizer; the rotational flow generator is used for enabling oil-gas mixed gas in the sand dune stabilizer to form rotational flow and spraying the rotational flow into a backflow area of the sand dune stabilizer. The radial stabilizer extends towards the center of the combustion chamber and is used for spraying oil-gas mixed gas in the sand dune stabilizer towards the center of the combustion chamber, so that the oil-gas mixed gas is better distributed in the combustion chamber to be fully combusted, and the radial stabilizer is beneficial to organizational combustion in the central area of the combustion chamber.

Description

Technical Field

[0001] The invention relates to the technical field of engine afterburner combustion chambers, and in particular to a flame stabilizer structure with a central swirl generator. Background Art

[0002] When the engine is working, the air flow velocity entering the afterburner component is relatively high. When the afterburner chamber component is started, the afterburner fuel supply assembly supplies fuel into the air flow channel. After a certain degree of mixing of oil and gas, it can be ignited and organized for combustion. Since the air flow velocity is much greater than the speed of flame propagation, it is impossible to organize the combustion of high-speed airflow under this condition. The purpose of adding a stabilizer is to form a low-speed recirculation zone behind the stabilizer through blunt body flow, which can be used to meet the ignition and flame stabilization in high-speed airflow. However, under certain extreme working conditions, the recirculation zone at the trailing edge of the stabilizer increases with the increase of the high-altitude Reynolds number, resulting in a decrease in the vortex intensity in the recirculation zone and a reduction in the range of the recirculation zone. Under additional low temperature and low pressure conditions, the ignition performance, reliability and stable operation of the combustion chamber will be adversely affected. It is necessary to strengthen the oil and gas mixing in the recirculation zone of the stabilizer and increase the range of the low-speed recirculation zone to improve the ignition and flame stabilization working conditions. To this end, a patent application with publication number CN1417521A discloses a bluff body and tornado combined swirl burner. After the oil-gas mixture enters the inner cavity of the sand dune bluff body, it enters the vortex zone through the premixed gas hole and is rotated and ejected through the cyclone tube. The burner has a high combustion speed, high combustion efficiency, and a wide oil-poor and oil-rich flameout boundary.

[0003] However, the above-mentioned prior art CN1417521A does not solve the problem of how to introduce the oil-gas mixture into the center of the combustion chamber so that the oil-gas mixture is better distributed in the combustion chamber for full combustion. Summary of the invention

[0004] The main purpose of the present invention is to propose a flame stabilizer structure with a central swirl generator, which can introduce the oil-gas mixture into the center of the combustion chamber so that the oil-gas mixture is better distributed in the combustion chamber for full combustion.

[0005] To achieve the above-mentioned purpose, the present invention proposes a flame stabilizer structure with a central swirl generator, including a plurality of stabilizer units evenly distributed in a ring shape in a combustion chamber, each stabilizer unit including a dune stabilizer, and a swirl generator and a radial stabilizer arranged on the dune stabilizer; the swirl generator is used to form a swirl of the oil-gas mixture in the dune stabilizer and spray it into the recirculation zone of the dune stabilizer; the radial stabilizer extends toward the center of the combustion chamber, and is used to spray the oil-gas mixture in the dune stabilizer toward the center of the combustion chamber.

[0006] Preferably, an air intake nozzle is provided on the dune stabilizer, and the air intake nozzle is used to introduce the oil-gas mixture into the dune stabilizer.

[0007] Preferably, the air inlet nozzle is parallel to the central axis of the combustion chamber, and the air inlet nozzle faces the front end of the combustion chamber; the angle between the radial stabilizer and the air inlet nozzle is β, and β is an obtuse angle.

[0008] Preferably, the included angle β between the radial stabilizer and the air inlet nozzle satisfies: 100°≤β≤105°.

[0009] Preferably, the radial stabilizer is a hollow tubular structure, and the radial stabilizer is connected to the inner cavity of the dune stabilizer.

[0010] Preferably, the radial stabilizer has two length specifications, including a first specification and a second specification, the length of the first specification is greater than the length of the second specification; stabilizer monomers with radial stabilizers of the first specification and stabilizer monomers with radial stabilizers of the second specification are alternately arranged in the circumferential direction.

[0011] Preferably, the length of the radial stabilizer of the first specification is L, and the length of the radial stabilizer of the second specification is B, satisfying: L / 2≤B≤2L / 3.

[0012] Preferably, the radius of the circle enclosed by the dune stabilizers on each stabilizer unit is R, and the length of the radial stabilizer of the first specification is L, and the two satisfy: R / 2≤L≤2R / 3.

[0013] Preferably, the number of the stabilizer units is n, n is an even number, and n≥12.

[0014] Preferably, the stabilizer unit is manufactured by 3D additive manufacturing.

[0015] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0016] (1) In the present invention, a radial stabilizer is provided on the dune stabilizer, and the radial stabilizer extends toward the center of the combustion chamber, so that the oil-gas mixture can be sprayed toward the center of the combustion chamber, so that the oil-gas mixture is better distributed in the combustion chamber for full combustion, that is, the radial stabilizer is provided to facilitate the organization of combustion in the central area of ​​the combustion chamber.

[0017] (2) In the present invention, a swirl generator is provided on the dune stabilizer, and the swirl produced by the oil-gas mixer is sent into the recirculation zone of the dune stabilizer through the swirl generator to form a low-speed oil-gas mixture that can be stably burned, and burn to form a stable duty flame for the connection of the afterburner. At the same time, the number of airflow swirls and the range of the low-speed recirculation zone are increased, the oil-gas mixing and combustion conditions in the stabilizer are improved, the stabilizer tail vortex shedding is suppressed, and the flame stability is enhanced.

[0018] (3) In the present invention, the radial stabilizer has two length specifications, including a first specification and a second specification, and the length of the first specification is greater than the length of the second specification; the stabilizer monomers with the first specification radial stabilizer and the stabilizer monomers with the second specification radial stabilizer are arranged alternately in the circumferential direction, and through this structure, the oil-gas mixture in each sand dune stabilizer can be well introduced into the combustion chamber, and the oil-gas mixture can be further better distributed in the combustion chamber for full combustion. At the same time, the use of radial stabilizers with alternating long and short layouts can effectively reduce the flow resistance in the central area of ​​the combustion chamber, and is conducive to organizing combustion in the central area of ​​the combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 An axonometric view of the flame stabilizer structure provided by the present invention;

[0021] Figure 2 A front view of the flame stabilizer structure provided by the present invention;

[0022] Figure 3 It is an axonometric view of the stabilizer unit in the present invention;

[0023] Figure 4 It is a front view of the stabilizer unit of the present invention;

[0024] Figure 5 It is a left side view of the stabilizer unit in the present invention;

[0025] Figure 6 for Figure 5 A-direction view;

[0026] Figure 7 This is a working principle diagram of the stabilizer monomer in the present invention.

[0027] Explanation of the accompanying drawings: 100, stabilizer unit; 3, radial stabilizer; 4, dune stabilizer; 5, air intake nozzle; 6, swirl generator. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] Combination Figures 1 to 7 As shown, a specific embodiment of a flame stabilizer structure with a central swirl generator provided by the present invention is provided. The flame stabilizer structure includes a plurality of stabilizer units 100 evenly distributed in a ring shape in the combustion chamber, each stabilizer unit 100 includes a dune stabilizer 4, and a swirl generator 6 and a radial stabilizer 3 arranged on the dune stabilizer 4; the swirl generator 6 is used to form a swirl of the oil-gas mixture in the dune stabilizer 4 and spray it into the recirculation zone of the dune stabilizer 4; the radial stabilizer 3 extends toward the center of the combustion chamber, and is used to spray the oil-gas mixture in the dune stabilizer 4 toward the center of the combustion chamber.

[0031] Since the combustion chamber is a conventional existing structure, it is not shown in the drawings and will not be described in detail here.

[0032] By adopting the above structure, the radial stabilizer 3 can be used to spray the oil-gas mixture in the dune stabilizer 4 toward the center of the combustion chamber, so that the oil-gas mixture is better distributed in the combustion chamber for full combustion.

[0033] Combination Figure 3 , Figure 5 As shown, an air intake nozzle 5 is provided on the dune stabilizer 4, and the air intake nozzle 5 is used to introduce the oil-gas mixture into the dune stabilizer 4. Furthermore, the air intake nozzle 5 is parallel to the central axis of the combustion chamber, and the air intake nozzle 5 faces the front end of the combustion chamber; the angle between the radial stabilizer 3 and the air intake nozzle 5 is β, and β is an obtuse angle. Specifically, the angle β between the radial stabilizer 3 and the air intake nozzle 5 satisfies: 100°≤β≤105°. By adopting the above structure, the radial stabilizer 3 is tilted toward the rear of the combustion chamber, so the radial stabilizer 3 can tilt and spray the oil-gas mixture.

[0034] The dune stabilizer 4 and the swirl generator 6 are conventional existing technologies and will not be described in detail here.

[0035] In this embodiment, the radial stabilizer 3 is a hollow tubular structure, and the radial stabilizer 3 is connected to the inner cavity of the dune stabilizer 4 .

[0036] Combination Figure 3 As shown, the radial stabilizer 3 has two length specifications, including a first specification and a second specification, and the length of the first specification is greater than the length of the second specification; the stabilizer monomers 100 with the first specification radial stabilizer and the stabilizer monomers 100 with the second specification radial stabilizer are arranged alternately in the annular direction. Furthermore, the length of the first specification radial stabilizer is L, and the length of the second specification radial stabilizer is B, which satisfies: L / 2≤B≤2L / 3. The radius of the circle surrounded by the dune stabilizer 4 on each stabilizer monomer 100 is R, and the length of the first specification radial stabilizer is L, and the two satisfy: R / 2≤L≤2R / 3.

[0037] In this embodiment, the number of the stabilizer monomers 100 is n. If n is an odd number, it cannot be ensured that the stabilizer monomers 100 with the first specification radial stabilizer and the stabilizer monomers 100 with the second specification radial stabilizer are alternately arranged in the circumferential direction, so n is required to be an even number. In this embodiment, n is an even number and satisfies n≥12.

[0038] In the implementation of the pump, the stabilizer unit 100 is manufactured by 3D additive manufacturing.

[0039] Combination Figure 7 As shown, the working principle of the flame stabilizer structure provided in this embodiment is as follows:

[0040] The front air intake nozzle 5 introduces the oncoming flow of the oil-gas mixture into the dune stabilizer 4, and the oil-gas mixture is sprayed out in two ways. One path of the oil-gas mixture passes through the cyclone generator 6 and is sprayed into the reflux area of ​​the dune stabilizer 4; the other path of the oil-gas mixture passes through the radial stabilizer 3 and is sprayed toward the center of the combustion chamber.

[0041] The oil-gas mixture is strengthened by the swirl generator 6 to strengthen the vortex intensity of the airflow, and under the extrusion of the vortex secondary flow, a recirculation zone is formed to be axially sprayed into the dune stabilizer 4, forming a low-speed oil-gas mixture that can be stably burned, and burning to form a stable duty flame for the connection of the afterburner. At the same time, the recirculation zone is aggregated with the mainstream recirculation gas formed by the curved surface of the dune stabilizer 4 to form a recirculation zone with a larger range of mass and energy exchange rates, which strengthens the overall oil-gas mixing degree in the recirculation zone and helps to reduce the frequency of vortex shedding at the trailing edge of the stabilizer. The number of airflow swirls can be increased by arranging the swirl generator 6 in the center of the dune stabilizer 4. The swirl airflow ejected by the swirl generator 6 widens the range of the recirculation zone of the dune stabilizer 4, and improves the oil-gas mixing and combustion conditions in the stabilizer. The mainstream reflow gas turbulence formed by the curved surface of the dune stabilizer 4 forms a low-speed reflow zone after the dune stabilizer 4, which interacts with the swirl generated by the swirler generator 6, thereby inhibiting the vortex shedding at the trailing edge of the stabilizer, increasing the swirl stability, and enhancing the flame stabilization capability.

[0042] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A flame stabilizer structure with a central swirl generator, comprising a plurality of stabilizer units (100) uniformly distributed in an annular shape in a combustion chamber, characterized in that: Each stabilizer unit (100) comprises a dune stabilizer (4), and a swirl generator (6) and a radial stabilizer (3) arranged on the dune stabilizer (4); The swirl generator (6) is used to form a swirl of the oil-gas mixture in the dune stabilizer (4) and spray it into the recirculation zone of the dune stabilizer (4); the radial stabilizer (3) extends toward the center of the combustion chamber and is used to spray the oil-gas mixture in the dune stabilizer (4) toward the center of the combustion chamber.

2. A flame stabilizer structure with a central swirl generator as claimed in claim 1, characterized in that: An air intake nozzle (5) is arranged on the sand dune stabilizer (4), and the air intake nozzle (5) is used to introduce an oil-gas mixture into the sand dune stabilizer (4).

3. A flame stabilizer structure with a central swirl generator as claimed in claim 2, characterized in that: The air inlet nozzle (5) is parallel to the central axis of the combustion chamber, and the air inlet nozzle (5) faces the front end of the combustion chamber; the angle between the radial stabilizer (3) and the air inlet nozzle (5) is β, and β is an obtuse angle.

4. A flame stabilizer structure with a central swirl generator as claimed in claim 3, characterized in that: The included angle β between the radial stabilizer (3) and the air inlet nozzle (5) satisfies: 100°≤β≤105°.

5. The flame stabilizer structure with a central swirl generator according to claim 1, characterized in that: The radial stabilizer (3) is a hollow tubular structure, and the radial stabilizer (3) is in communication with the inner cavity of the sand dune stabilizer (4).

6. A flame stabilizer structure with a central swirl generator as claimed in claim 1, characterized in that: The radial stabilizer (3) has two length specifications, including a first specification and a second specification, and the length of the first specification is greater than the length of the second specification; The stabilizer monomers (100) having a radial stabilizer of a first specification and the stabilizer monomers (100) having a radial stabilizer of a second specification are arranged alternately in the annular direction.

7. A flame stabilizer structure with a central swirl generator as claimed in claim 6, characterized in that: The length of the radial stabilizer of the first specification is L, and the length of the radial stabilizer of the second specification is B, which satisfies: L / 2≤B≤2L / 3.

8. A flame stabilizer structure with a central swirl generator as claimed in claim 7, characterized in that: The radius of the circle enclosed by the dune stabilizers (4) on each stabilizer monomer (100) is R, and the length of the first specification radial stabilizer is L, and the two satisfy: R / 2≤L≤2R / 3.

9. A flame stabilizer structure with a central swirl generator as claimed in claim 6, characterized in that: The number of the stabilizer monomers (100) is n, n is an even number, and n≥12.

10. The flame stabilizer structure with a central swirl generator according to claim 1, characterized in that: The stabilizer unit (100) is manufactured by 3D additive manufacturing.

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