Support plate stabilizer with pneumatic jet flow regulation and control function and afterburner

Abstract

The invention relates to the technical field of afterburners of aero-engines, in particular to a support plate stabilizer with a pneumatic jet flow regulation and control function and an afterburner. The supporting plate stabilizer comprises a supporting plate body and a boss integrally formed on the top of the supporting plate body. A first gas collecting cavity, a second gas collecting cavity and an on-duty oil supply cavity are sequentially arranged in the supporting plate body at intervals from front to back. An on-duty oil injection rod is inserted into the on-duty oil supply cavity; the boss is provided with a first air inlet hole, a second air inlet hole and a third air inlet hole which are respectively used for introducing external culvert air into the first air collecting cavity, the second air collecting cavity and the on-duty oil supply cavity; a first jet flow seam, a second jet flow seam and a third jet flow seam are sequentially formed in the left side face and the right side face of the supporting plate body from front to back. The first jet flow seam is communicated with the first gas collecting cavity, and the second jet flow seam is communicated with the second gas collecting cavity; and the third jet flow seam is communicated with the on-duty oil supply cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of afterburner combustion chambers for aircraft engines, and in particular to a support plate stabilizer and an afterburner combustion chamber with a pneumatic jet control function. Background Art

[0002] As afterburner components develop towards a wide speed range, low flow resistance, light weight and high performance, short-distance, low-resistance afterburner combustion organization technology with close oil and gas coupling has gradually been widely adopted.

[0003] In the prior art, there are many related patent applications regarding afterburner chambers.

[0004] For example, the patent application with publication number CN109340820A discloses an integrated afterburner with a support plate and a cooling structure. Support plates are arranged on both sides of the rectifier support plate flame stabilizer. There are double rows of inclined oil spray holes at the rear of the support plate. The oil spray holes spray the fuel onto the support plate wall for crushing and secondary atomization, thereby improving the combustion efficiency and combustion stability of the afterburner.

[0005] Another example is the patent application with publication number CN118391707A, which discloses an afterburner ignition device and afterburner. By introducing the external cold air into the ignition device, it not only effectively ensures the cooling effect of the ignition device and improves the oxygen content, but also improves the structural reliability and the stability of the on-duty flame. At the same time, the flow field in the on-duty flame stabilizer reduces the influence of the mainstream flow field, so that the mainstream gas flow is not affected too much. By guiding the flame from the flame acceleration cone into the mainstream of the afterburner, the ignition energy is effectively increased and the flame penetration depth is increased.

[0006] For another example, a patent application with publication number CN114738795 discloses a support plate stabilizer and an integrated afterburner with a mixing function. Two symmetrical open cavities are provided in the middle of the support plate stabilizer. The open cavities have a mixing function and can replace the mixer in the traditional afterburner, simplifying the structure of the afterburner. Since the outer duct airflow flows into the inner duct through the holes on the front wall of the open duct and mixes with the inner duct airflow, the mixing distance of the inner and outer duct airflows is shortened, and the mixing effect of the inner and outer duct airflows is enhanced, which is beneficial to the mixing of the rear fuel and the mixed air and improves the uniformity of fuel distribution.

[0007] However, due to the high air velocity at the inlet of the afterburner, the short retention time of the injected fuel, and the close distance between the fuel supply point and the stabilizer, it is difficult to organize combustion under actual working conditions. The above-mentioned prior art does not solve this problem. Summary of the invention

[0008] The main purpose of the present invention is to propose a support plate stabilizer and afterburner with aerodynamic jet control function, aiming to solve the above technical problems.

[0009] To achieve the above-mentioned purpose, on the one hand, the present invention proposes a support plate stabilizer with a pneumatic jet control function, comprising a support plate body and a boss integrally formed on the top of the support plate body; a first air collecting chamber, a second air collecting chamber and a duty oil supply chamber are sequentially arranged from front to back inside the support plate body; a duty oil spray rod is inserted in the duty oil supply chamber; a first air inlet hole, a second air inlet hole and a third air inlet hole are arranged on the boss, which are respectively used to introduce external air into the first air collecting chamber, the second air collecting chamber and the duty oil supply chamber; a first jet slit, a second jet slit and a third jet slit are sequentially opened on the left and right side surfaces of the support plate body from front to back; the first jet slit is connected to the first air collecting chamber, the second jet slit is connected to the second air collecting chamber; the third jet slit is connected to the duty oil supply chamber.

[0010] Preferably, the third jet slit is a long strip-shaped slit, and the third jet slit is arranged along the length direction of the support plate body; the number of the first jet slits is multiple, and the multiple first jet slits are evenly spaced along the length direction of the support plate body; the number of the second jet slits is multiple, and the multiple second jet slits are evenly spaced along the length direction of the support plate body; in the long direction of the support plate body, the first jet slits and the second jet slits are alternately distributed.

[0011] Preferably, a trapezoidal groove is provided at the rear end of the support plate body, and the trapezoidal groove is arranged along the long direction of the support plate body.

[0012] Preferably, the included angle of the inclined surfaces on both sides of the trapezoidal groove is ω, ω=80°~90°.

[0013] Preferably, the inlet of the first air inlet hole is opened on the arc surface at the front end of the boss; the number of the second air inlet holes is two, and the two second air inlet holes are arranged in a V shape, and the inlets of the two second air inlet holes are respectively opened on the left and right curved surfaces of the boss; the number of the third air inlet holes is two, and the two third air inlet holes are arranged in a V shape, and the inlets of the two third air inlet holes are respectively opened on the left and right curved surfaces of the boss; the second air inlet hole and the third air inlet hole are both inclined toward the front end of the boss.

[0014] Preferably, the angle between the two second air inlet holes is α, and the angle between the two third air inlet holes is β; α and β are both 70° to 75°.

[0015] Preferably, the first jet slit and the second jet slit are both inclined toward the rear of the support plate body; and the third jet slit is perpendicular to the left-right symmetric plane A of the support plate stabilizer.

[0016] Preferably, the angle between the first jet slits on the left and right sides of the support plate body is γ, and γ=135°~145°.

[0017] Preferably, the angle between the second jet slits on the left and right sides of the support plate body is δ, δ=135°~145°.

[0018] On the other hand, the present invention also provides an afterburner, comprising a combustion chamber casing, a mixer and a center cone coaxially arranged in sequence from the outside to the inside; the mixer and the center cone are connected by a plurality of support plate stabilizers distributed in a spoke shape; the support plate stabilizer adopts the above-mentioned support plate stabilizer, and the boss extends into the outer duct formed between the combustion chamber casing and the mixer.

[0019] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0020] (1) The first gas collecting chamber, the second gas collecting chamber and the duty oil supply chamber are arranged in sequence from front to back in the support plate body of the support plate stabilizer. The gas in the first gas collecting chamber is ejected through the first jet slit to form a transverse jet I; the gas in the second gas collecting chamber is ejected through the second jet slit to form a transverse jet II; the oil-gas mixture in the duty oil supply chamber is ejected from the third jet slit. Since the first jet slit is located in front of the second jet slit, the transverse jet I is located in front of the transverse jet II. Therefore, in order to avoid mutual interference between the mainstream and the transverse jet II, the transverse jet I is introduced before the transverse jet II to form an aerodynamic barrier, which can lift the mainstream of the near-wall turbulence around the wall to a certain height and then flow backward, reducing the impact on the interaction flow between the downstream transverse jet II and the duty oil-gas mixture, so that the transverse jet II and the downstream duty oil-gas mixture are further mixed to improve the atomization quality, which is beneficial to organize combustion.

[0021] (2) In the support plate stabilizer provided by the present invention, when in use, two transverse air jets can be formed successively, so that two aerodynamic barriers are formed on the wall surface of the support plate stabilizer, thereby reducing the wall surface temperature and enabling it to work reliably at a higher incoming flow temperature.

[0022] (3) In the support plate stabilizer provided by the present invention, a reflux zone can be formed by arranging a trapezoidal groove at the rear end of the support plate body, which is conducive to the gradual polymerization of the on-duty oil and gas mixture to generate a stable combustion flame in the reflux zone at the rear edge of the support plate body, thereby forming a stable flame.

[0023] (4) The support plate stabilizer provided by the present invention fully utilizes the mechanism of the momentum difference between the jet and the injected fuel to enhance the aerodynamic atomization of the fuel, thereby improving the atomization quality of the supplied fuel and assisting in forming an oil-gas mixture equivalence ratio that is more conducive to combustion, thereby achieving stable combustion within a wider range of operating parameters.

[0024] (5) The support plate stabilizer provided by the present invention integrates multiple functions such as air cooling, on-duty oil supply, and flame stabilization, thereby meeting the use requirements of high-load, low-flow resistance afterburner combustion chambers. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 A schematic diagram of the structure of the afterburner provided by the present invention;

[0027] Figure 2 An axonometric view of the support plate stabilizer provided by the present invention;

[0028] Figure 3 A main cross-sectional view of the support plate stabilizer provided by the present invention;

[0029] Figure 4 for Figure 3 Middle AA section view;

[0030] Figure 5 for Figure 3 Middle BB section view;

[0031] Figure 6 This is a working principle diagram of the support plate stabilizer provided by the present invention.

[0032] Explanation of the accompanying figures: 1. Combustion chamber casing; 2. Mixer; 3. On-duty fuel injection rod; 4. Support plate stabilizer; 4a. Boss; 4b. Trapezoidal groove; 4c. Support plate body; 5. Center cone; 6. First air collecting cavity; 6a. First air inlet hole; 6b. First jet slit; 7. Second air collecting cavity; 7a. Second air inlet hole; 7b. Second jet slit; 8. On-duty fuel supply cavity; 8a. Third air inlet hole; 8b. Third jet slit. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] Combination Figures 2 to 5 As shown, on the one hand, this embodiment provides a support plate stabilizer with a pneumatic jet control function. First, for ease of description, the end of the support plate stabilizer where the flow-facing surface is located is defined as the front end.

[0037] The support plate stabilizer includes a support plate body 4c and a boss 4a integrally formed on the top of the support plate body 4c; a first air collecting chamber 6, a second air collecting chamber 7 and a duty oil supply chamber 8 are arranged in sequence from front to back inside the support plate body 4c; a duty oil injection rod 3 is inserted in the duty oil supply chamber 8; a first air inlet hole 6a, a second air inlet hole 7a and a third air inlet hole 8a are arranged on the boss 4a, which are respectively used to introduce external air into the first air collecting chamber 6, the second air collecting chamber 7 and the duty oil supply chamber 8; a first jet slit 6b, a second jet slit 7b and a third jet slit 8b are opened in sequence from front to back on the left and right side surfaces of the support plate body 4c; the first jet slit 6b is connected to the first air collecting chamber 6, the second jet slit 7b is connected to the second air collecting chamber 7; the third jet slit 8b is connected to the duty oil supply chamber 8.

[0038] In this embodiment, the entire support plate stabilizer is a bilaterally symmetrical structure. Figure 4 and Figure 5 As shown, the symmetry plane is plane A in the figure. The center lines of the first air collecting cavity 6, the second air collecting cavity 7, and the duty oil supply cavity 8 are all located on the symmetry plane A.

[0039] Combination Figure 2 and Figure 3 As shown, the first air collecting chamber 6, the second air collecting chamber 7 and the on-duty oil supply chamber 8 are all air flow channels extending along the length direction of the support plate body 4c; the third jet slit 8b is a long strip-shaped slit, and the third jet slit 8b is arranged along the length direction of the support plate body 4c; the number of the first jet slits 6b is multiple, and the multiple first jet slits 6b are evenly spaced along the length direction of the support plate body 4c; the number of the second jet slits 7b is multiple, and the multiple second jet slits 7b are evenly spaced along the length direction of the support plate body 4c; in the long direction of the support plate body 4c, the first jet slits 6b and the second jet slits 7b are alternately distributed.

[0040] Combination Figure 2 and Figure 5 As shown, a trapezoidal groove 4b is provided at the tail end of the support plate body 4c, and the trapezoidal groove 4b is arranged along the long direction of the support plate body 4c, and the opening of the trapezoidal groove 4b faces the tail end of the entire support plate stabilizer. Further, the angle between the inclined surfaces on both sides of the trapezoidal groove 4b is ω, ω = 80° to 90°.

[0041] Combination Figure 4 As shown, the inlet of the first air inlet 6a is opened on the arc surface at the front end of the boss 4a; the number of the second air inlet 7a is two, and the two second air inlet holes 7a are arranged in a V shape, and the inlets of the two second air inlet holes 7a are respectively opened on the left and right curved surfaces of the boss 4a; the number of the third air inlet 8a is two, and the two third air inlet holes 8a are arranged in a V shape, and the inlets of the two third air inlet holes 8a are respectively opened on the left and right curved surfaces of the boss 4a; the second air inlet 7a and the third air inlet 8a are both inclined toward the front end of the boss 4a. The two second air inlet holes 7a are arranged symmetrically about plane A, and the two third air inlet holes 8a are also arranged symmetrically about plane A. Specifically, the angle between the two second air inlet holes 7a is α, and the angle between the two third air inlet holes 8a is β; α and β are both 70° to 75°. By setting the second air inlet 7a and the third air inlet 8a in an inclined shape, it is convenient to introduce external air.

[0042] Combination Figure 5 As shown, the first jet slit 6b and the second jet slit 7b are both inclined toward the rear of the support plate body 4c; the third jet slit 8b is perpendicular to the left-right symmetry plane A of the support plate stabilizer. Further, the first jet slits 6b on the left and right sides of the support plate body 4c are symmetrically arranged about plane A, the second jet slits 7b on the left and right sides of the support plate body 4c are symmetrically arranged about plane A, and the third jet slits 8b on the left and right sides of the support plate body 4c are both symmetrically arranged about plane A. Further, the angle between the first jet slits 6b on the left and right sides of the support plate body 4c is γ, γ = 135° ~ 145°. The angle between the second jet slits 7b on the left and right sides of the support plate body 4c is δ, δ = 135° ~ 145°.

[0043] Combination Figure 1 As shown, as the second aspect of this embodiment, an afterburner is provided, comprising a combustion chamber casing 1, a mixer 2 and a center cone 5 coaxially arranged in sequence from the outside to the inside; the mixer 2 and the center cone 5 are connected by a plurality of support plate stabilizers 4 distributed in a spoke shape; the support plate stabilizer 4 adopts the above-mentioned support plate stabilizer.

[0044] An outer duct is formed between the combustion chamber casing 1 and the mixer 2, and an inner duct is formed between the mixer 2 and the center cone 5. One end of the support plate stabilizer 4 is connected to the mixer 2, and the other end is connected to the center cone 5. The boss 4a on the support plate stabilizer 4 extends into the outer duct formed between the combustion chamber casing 1 and the mixer 2, and the trapezoidal groove 4b at the rear end of the support plate body 4c extends from the inner surface of the mixer 2 to the outer surface of the center cone 5. The first air collecting cavity 6, the second air collecting cavity 7, and the duty oil supply cavity 8 in the support plate body 4c are all airflow channels extending from the mixer 2 to the center cone 5.

[0045] The central cone 5 is a typical component in the afterburner, and will not be described in detail here. The central cone 5 is used to decelerate and expand the inner airflow.

[0046] Combination Figures 4 to 6 As shown, the working principles of the support plate stabilizer and afterburner provided in this embodiment are as follows:

[0047] A first air collecting chamber 6, a second air collecting chamber 7 and a duty oil supply chamber 8 are arranged in sequence from front to back in the support plate body 4c of the support plate stabilizer 4. External air is introduced into the first air collecting chamber 6 by utilizing the first air inlet hole 6a, external air is introduced into the second air collecting chamber 7 by utilizing the second air inlet hole 7a, and external air is introduced into the duty oil supply chamber 8 by utilizing the third air inlet hole 8a.

[0048] The gas in the first gas collecting chamber 6 is ejected through the first jet slit 6b to form a transverse jet I; the gas in the second gas collecting chamber 7 is ejected through the second jet slit 7a to form a transverse jet II; the oil-gas mixture in the duty oil supply chamber 8 is ejected from the third jet slit. Since the first jet slit 6a is located in front of the second jet slit 7a, the transverse jet I is located in front of the transverse jet II. Therefore, in order to avoid the mutual interference between the mainstream and the transverse jet II, the transverse jet I is introduced before the transverse jet II to form an aerodynamic barrier, which can lift the mainstream of the near-wall turbulence around the wall to a certain height and then flow backward, reducing the impact on the interaction flow between the downstream transverse jet II and the duty oil-gas mixture, so that the transverse jet II and the downstream duty oil-gas mixture are further mixed to improve the atomization quality.

[0049] During operation, due to the simultaneous existence of transverse jets I and II, two aerodynamic barriers are formed on the wall of the support plate stabilizer 4, which reduces the wall temperature and enables it to work reliably at a higher incoming flow temperature.

[0050] A reflux zone can be formed by arranging a trapezoidal groove 4b at the rear end of the support plate body, which is conducive to the gradual aggregation of the on-duty oil-gas mixture and the generation of a stable combustion flame in the reflux zone at the rear edge of the support plate body 4c.

[0051] When the afterburner is turned on, the on-duty injection rod 3 supplies oil to the on-duty oil supply chamber 8, and draws external air into the on-duty oil supply chamber 8 through the third air inlet hole 8a, and forms an on-duty oil-gas mixture with the fuel mixer sprayed from the on-duty injection rod 3, and is sprayed into the mainstream from the third jet slot 8b, and mixed with the lateral jet II at its front end. The atomization effect of the on-duty fuel is enhanced through the difference in the two flow rates, and it plays a role in forming appropriate oil and gas after mixing with the on-duty fuel, and then enters the reflux area for stable combustion.

[0052] In the afterburner cold state, external air is introduced into the duty oil supply chamber 8 through the third air inlet hole 8a and ejected from the third jet slit 8b, forming an aerodynamic barrier on the wall surface, reducing the wall surface temperature so that it can work reliably at a higher incoming flow temperature.

[0053] Since the first jet slits 6b and the second jet slits 7b are alternately distributed in the long direction of the support plate body 4c, the transverse jets I and II formed by the first jet slits 6b and the second jet slits 7b are alternately distributed.

[0054] In the afterburner, since a trapezoidal groove 4b is provided at the rear end of the support plate body 4c, the distance between two adjacent support plate stabilizers 4 at the outer surface of the central cone 5 is relatively close, so the small-spacing recirculation zone can realize circumferential flame connection.

[0055] In this embodiment, the first jet slit 6b and the second jet slit 7b are both inclined toward the rear of the support plate body 4c, so that the ejected lateral jets I and II are directed toward the rear of the support plate body 4c.

[0056] 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 support plate stabilizer with pneumatic jet control function, characterized in that: It comprises a support plate body (4c) and a boss (4a) integrally formed on the top of the support plate body (4c); a first air collecting chamber (6), a second air collecting chamber (7) and a duty oil supply chamber (8) are sequentially arranged from front to back inside the support plate body (4c); and a duty oil spray rod (3) is inserted into the duty oil supply chamber (8); The boss (4a) is provided with a first air inlet hole (6a), a second air inlet hole (7a) and a third air inlet hole (8a), which are used to introduce external air into the first air collecting chamber (6), the second air collecting chamber (7) and the duty oil supply chamber (8) respectively; A first jet slit (6b), a second jet slit (7b), and a third jet slit (8b) are sequentially provided on the left and right side surfaces of the support plate body (4c) from front to back; the first jet slit (6b) is connected to the first air collecting chamber (6), the second jet slit (7b) is connected to the second air collecting chamber (7); and the third jet slit (8b) is connected to the duty oil supply chamber (8).

2. The support plate stabilizer according to claim 1, characterized in that: The third jet slit (8b) is a long strip-shaped slit, and the third jet slit (8b) is arranged along the length direction of the support plate body (4c); The number of the first jet slits (6b) is multiple, and the multiple first jet slits (6b) are evenly spaced along the length direction of the support plate body (4c); The number of the second jet slits (7b) is multiple, and the multiple second jet slits (7b) are evenly spaced along the length direction of the support plate body (4c); In the long direction of the support plate body (4c), the first jet slits (6b) and the second jet slits (7b) are distributed alternately.

3. The support plate stabilizer according to claim 1, characterized in that: A trapezoidal groove (4b) is provided at the rear end of the support plate body (4c), and the trapezoidal groove (4b) is arranged along the long direction of the support plate body (4c).

4. The support plate stabilizer according to claim 3, characterized in that: The included angle of the inclined surfaces on both sides of the trapezoidal groove (4b) is ω, ω=80°-90°.

5. The support plate stabilizer according to claim 1, characterized in that: The inlet of the first air inlet hole (6a) is opened on the arc surface at the front end of the boss (4a); The number of the second air inlet holes (7a) is two, and the two second air inlet holes (7a) are arranged in a V shape, and the inlets of the two second air inlet holes (7a) are respectively opened on the left and right curved surfaces of the boss (4a); The number of the third air inlet holes (8a) is two, and the two third air inlet holes (8a) are arranged in a V shape, and the inlets of the two third air inlet holes (8a) are respectively opened on the left and right curved surfaces of the boss (4a); The second air inlet hole (7a) and the third air inlet hole (8a) are both inclined toward the front end of the boss (4a).

6. The support plate stabilizer according to claim 1, characterized in that: The included angle between the two second air inlet holes (7a) is α, and the included angle between the two third air inlet holes (8a) is β; α and β are both 70° to 75°.

7. The support plate stabilizer according to claim 1, characterized in that: The first jet slit (6b) and the second jet slit (7b) are both inclined toward the rear of the support plate body (4c); and the third jet slit (8b) is perpendicular to the left-right symmetric plane A of the support plate stabilizer.

8. The support plate stabilizer according to claim 7, characterized in that: The included angle between the first jet slits (6b) on the left and right sides of the support plate body (4c) is γ, where γ=135° to 145°.

9. The support plate stabilizer according to claim 7, characterized in that: The included angle between the second jet slits (7b) on the left and right sides of the support plate body (4c) is δ, δ=135°-145°.

10. An afterburner, comprising a combustion chamber casing (1), a mixer (2) and a central cone (5) which are coaxially arranged in sequence from outside to inside; the mixer (2) and the central cone (5) are connected via a plurality of support plate stabilizers (4) distributed in a spoke shape; characterized in that: The support plate stabilizer (4) is a support plate stabilizer as claimed in any one of claims 1 to 9, and the boss (4a) extends into the outer duct formed between the combustion chamber casing (1) and the mixer (2).

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