Fuel blending flame stabilizing structure, dual variable combustion chamber and engine

Abstract

This invention relates to the technical field of combustion devices, and particularly to a fuel blending flame stabilization structure, a dual-variable combustion chamber, and an engine. The fuel blending flame stabilization structure includes: a flame stabilization body, equipped with a pre-combustion channel and multiple fuel passages, one end of the pre-combustion channel having an inlet and the other end having an outlet; a swirler; multiple first nozzles; multiple second nozzles; and multiple third nozzles; wherein the second nozzles arranged in adjacent fuel passages intersect in direction, and the direction of the third nozzles is the same as the direction of the pre-combustion channel outlet. This invention achieves flame stabilization in the pre-combustion stage through the combination of the swirler and the first nozzles; the intersecting directions of the second nozzles arranged in adjacent fuel passages achieve flame stabilization; and the injection of fuel by the third nozzles towards the pre-combustion channel outlet of the flame stabilization body enables circumferential flame propagation, achieving a stable flame stabilization effect. It is applicable to the outer ring of a dual-variable combustion chamber, thereby achieving flame stabilization in the outer ring of the dual-variable combustion chamber.

Description

Technical Field

[0001] This invention relates to the technical field of combustion devices, and in particular to a fuel blending flame stabilization structure, a dual-variable combustion chamber, and an engine. Background Technology

[0002] The high-flow dual-cycle engine adopts a dual-cycle overall design. By switching between the core bypass duct and multiple bypass ducts, it achieves both turbofan and turbojet operating modes, taking into account the economy of low-speed subcruise, the economy and acceleration of medium-speed supersonic flight, and the demand for sustained high thrust at high speeds. Therefore, the use of a dual-combustion chamber combustion method plays a key role in the high-flow dual-cycle engine.

[0003] The dual-circuit combustor draws air through the outer bypass duct and other bypass ducts in turbofan mode, and through a single bypass duct in turbojet mode. The portion of the dual-circuit combustor corresponding to the airflow from the outer bypass duct is called the outer ring. In turbofan mode, the airflow into the outer bypass duct comes from clean air with a speed (40-80 m / s) and temperature (400-930 K) from the core fan. In turbojet mode, it comes from clean air with a moderate speed (on the order of 100 m / s) and temperature (850-1270 K) from the front and rear fans of the other bypass ducts. Therefore, the intake conditions of the outer ring are complex and variable.

[0004] The head reference velocity (intake velocity in the fuel injection area) of the outer ring of the dual-variable combustion chamber is much greater than that of the conventional main combustion chamber, but not as great as that of the afterburner. In addition, due to the complex and variable flow of the outer ring, the flow characteristics of the outer bypass duct and the other bypass ducts are very different. Moreover, the outer ring flow is low-temperature pure air, which makes fuel evaporation more difficult. Therefore, the flame stabilization methods of the conventional main combustion chamber or afterburner cannot be applied to the outer ring of the dual-variable combustion chamber, and the flame stabilization of the outer ring of the dual-variable combustion chamber cannot be achieved. Summary of the Invention

[0005] This invention provides a fuel blending flame stabilization structure to solve the problem in the prior art where the outer ring inflow is complex and variable, the inflow properties of the outer bypass duct and other bypass ducts are very different, and the outer ring inflow is low-temperature pure air, making fuel evaporation difficult. Therefore, conventional flame stabilization methods for the main combustion chamber or afterburner cannot be applied to the outer ring of the dual-variable combustion chamber, and the outer ring flame stabilization of the dual-variable combustion chamber cannot be achieved.

[0006] This invention provides a fuel blending flame stabilization structure for the outer ring of a dual-variable combustion chamber, comprising:

[0007] The flame stabilizer body is provided with a pre-combustion channel and multiple oil passages. One end of the pre-combustion channel has an inlet and the other end has an outlet. The multiple oil passages are arranged circumferentially around the pre-combustion channel at intervals.

[0008] A cyclone separator is located in the pre-combustion channel;

[0009] Multiple first nozzles are disposed on the flame stabilizing body, each first nozzle corresponds one-to-one with each oil passage, and the oil passage is connected to the pre-combustion passage through the first nozzle;

[0010] Multiple second nozzles are disposed on the flame stabilizer body. The second nozzles are used to contact and cooperate with air, and each oil passage is provided with a corresponding second nozzle. The second nozzles are connected to the oil passage.

[0011] Multiple third nozzles are disposed on the flame stabilizer body. The third nozzles are used to contact and cooperate with air, and at least a portion of the oil passage is arranged with corresponding third nozzles. The third nozzles are connected to the oil passage.

[0012] The second nozzles arranged in adjacent oil passages have intersecting orientations, and the orientation of the third nozzle is the same as the outlet orientation of the pre-combustion passage.

[0013] According to the present invention, a fuel blending flame stabilizing structure is provided, wherein the flame stabilizing body comprises:

[0014] The outer casing has two opposing ends arranged to form the pre-combustion channel, and a plurality of first nozzles are disposed on the outer casing;

[0015] Multiple support plates are spaced apart and circumferentially disposed on the outer wall of the housing, and each support plate has the oil passage.

[0016] The second nozzle is arranged on one side wall of each support plate in a direction perpendicular to the center line of the pre-combustion channel of the outer shell, and the third nozzle is arranged on the other side wall of at least some of the support plates in a direction perpendicular to the center line of the outer shell, with the second nozzle and the third nozzle intersecting each other.

[0017] According to a fuel blending and flame stabilization structure provided by the present invention, the position of each first nozzle is offset from the middle of the length direction of the housing, and each first nozzle is disposed close to the inlet of the pre-combustion channel.

[0018] According to a fuel blending flame stabilization structure provided by the present invention, the second nozzle protrudes from the outer side wall of the support plate.

[0019] According to a fuel blending flame stabilization structure provided by the present invention, each of the support plates has a second nozzle arranged on its opposite side walls.

[0020] According to a fuel blending flame stabilization structure provided by the present invention, the second nozzles on the opposite side walls of each of the support plates are staggered along the direction of the support plates.

[0021] According to the present invention, a fuel blending flame stabilizing structure is provided, wherein there are four support plates, the outer shell is provided with a first direction and a second direction, the support plates are respectively arranged along the opposite side walls of the outer shell in the first direction, and the support plates are respectively arranged along the opposite side walls of the outer shell in the second direction.

[0022] The third nozzle is arranged on the support plate corresponding to the two opposite side walls along the second direction of the outer shell.

[0023] According to the present invention, a fuel blending flame stabilization structure is provided, wherein the support plate and the outer shell are an integral structure.

[0024] The present invention also provides a dual-variable combustion chamber, including the above-mentioned fuel blending and flame stabilization structure.

[0025] The present invention also provides an engine including the above-described dual-variable combustion chamber.

[0026] The fuel mixing flame stabilization structure provided by this invention comprises three types of nozzles: a first nozzle, a second nozzle, and a third nozzle. The fuel passage is connected to the pre-combustion passage through the first nozzle, and the combination of the swirler and the first nozzle achieves flame stabilization in the pre-combustion stage. The intersecting orientations of the second nozzles arranged in adjacent fuel passages provide flame stabilization during fuel-air mixing combustion. The orientation of the third nozzle is aligned with the outlet orientation of the pre-combustion passage, spraying fuel towards the outlet direction of the pre-combustion passage of the flame stabilization body, thus achieving circumferential flame propagation. The combination of the second and third nozzles achieves a stable flame stabilization effect. The structure is simple and reasonable, applicable to the outer ring of a dual-variable combustion chamber, thereby achieving flame stabilization in the outer ring of the dual-variable combustion chamber. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a first-view structural schematic diagram of the fuel blending flame stabilization structure provided by the present invention;

[0029] Figure 2 yes Figure 1 Enlarged schematic diagram of the structure at point A;

[0030] Figure 3 This is a second-view structural schematic diagram of the fuel blending flame stabilization structure provided by the present invention;

[0031] Figure 4 This is a third-view structural schematic diagram of the fuel blending flame stabilization structure provided by the present invention;

[0032] Figure 5 yes Figure 4 A cross-sectional view along the AA direction;

[0033] Figure 6 yes Figure 4 A cross-sectional view along the BB direction.

[0034] Figure label:

[0035] 10. Flame stabilizer body; 11. Pre-combustion channel; 111. Inlet; 112. Outlet; 12. Oil passage; 13. Outer shell; 14. Support plate; 20. Swirl generator; 30. First nozzle; 40. Second nozzle; 50. Third nozzle. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0037] In the existing technology, conventional flame stabilization methods in the main combustion chamber have strong flame stabilization capabilities, but relatively low total pressure recovery; while conventional flame stabilization methods in the afterburner have higher total pressure recovery, but limited flame stabilization range and excessively long combustion distance. Therefore, conventional flame stabilization methods in the main combustion chamber or afterburner cannot be applied to the outer ring of the dual-variable combustion chamber and cannot achieve flame stabilization in the outer ring of the dual-variable combustion chamber.

[0038] The following is combined Figures 1-6 The present invention describes a fuel blending flame stabilization structure, a dual-variable combustion chamber, and an engine. The dual-variable combustion chamber includes the fuel blending flame stabilization structure, which can be understood as being applicable to the outer ring of the dual-variable combustion chamber. The engine includes the dual-variable combustion chamber. It should be noted that the engine type can be a high-flow dual-variable cycle engine.

[0039] Reference Figure 1 , Figure 2 , Figure 5 and Figure 6According to the present invention, a fuel blending flame stabilization structure is provided, comprising: a flame stabilizing body 10, having a pre-combustion channel 11 and a plurality of fuel passages 12, one end of the pre-combustion channel 11 having an inlet 111 and the other end having an outlet 112, the plurality of fuel passages 12 being arranged circumferentially around the pre-combustion channel 11 at intervals; a swirler 20 disposed in the pre-combustion channel 11; a plurality of first nozzles 30 disposed in the flame stabilizing body 10, each first nozzle 30 corresponding one-to-one with each fuel passage 12, and the fuel passage 12 being connected to the pre-combustion channel 11 through the first nozzle 30; and a plurality of second nozzles 40. A second nozzle 40 is disposed on the flame stabilizing body 10 and is used to contact and cooperate with air. Each oil passage 12 is provided with a corresponding second nozzle 40, and the second nozzle 40 is connected to the oil passage 12. A plurality of third nozzles 50 are disposed on the flame stabilizing body 10 and are used to contact and cooperate with air. At least some oil passages 12 are provided with corresponding third nozzles 50, and the third nozzles 50 are connected to the oil passage 12. The orientations of the second nozzles 40s arranged in adjacent oil passages 12 intersect, and the orientations of the third nozzles 50 and the outlet 112 of the pre-combustion passage 11 are arranged in the same direction.

[0040] The fuel mixing flame stabilization structure provided by this invention has three types of nozzles: a first nozzle 30, a second nozzle 40, and a third nozzle 50. The fuel passage 12 is connected to the pre-combustion passage 11 through the first nozzle 30, and the combination of the swirler 20 and the first nozzle 30 achieves flame stabilization in the pre-combustion stage. The intersecting orientations of the second nozzles 40 arranged in adjacent fuel passages 12 play a role in flame stabilization during fuel and air mixing combustion. The orientation of the third nozzle 50 is the same as that of the outlet 112 of the pre-combustion passage 11, and fuel is sprayed towards the outlet 112 of the pre-combustion passage 11 of the flame stabilization body 10, achieving circumferential flame propagation. The combination of the second and third nozzles 50 achieves the effect of stable flame stabilization. The structure is simple and reasonable, and can be applied to the outer ring of a dual-variable combustion chamber, thereby achieving flame stabilization in the outer ring of the dual-variable combustion chamber.

[0041] It should be noted that the inlet 111 of the pre-combustion channel 11 is for air flow, while the outlet 112 of the pre-combustion channel 11 is for combustion; the swirler 20 mentioned above can effectively mix fuel and air by generating a rotating flow, which can improve the mixing effect, increase the mixing intensity and turbulence intensity, thereby improving the efficiency and stability of the combustion reaction.

[0042] Understandably, referring to Figures 1 to 6In some embodiments of the present invention, the flame stabilizing body 10 includes: a shell 13, with its two opposite ends arranged to form a pre-combustion channel 11, and a plurality of first nozzles 30 disposed on the shell 13; a plurality of support plates 14, spaced apart and circumferentially disposed on the outer side wall of the shell 13, each support plate 14 having an oil passage 12; wherein, a second nozzle 40 is disposed on one side wall of each support plate 14 in a direction perpendicular to the center line of the pre-combustion channel 11 of the shell 13, and a third nozzle 50 is disposed on the other side wall of at least a portion of the support plates 14 in a direction perpendicular to the center line of the shell 13, the second nozzle 40 and the third nozzle 50 intersecting in orientation. Using the above structure, by combining the stabilizing body with the shell 13 and the plurality of support plates 14, the total pressure recovery is high, which not only improves the structural strength and stability of the fuel-blended flame stabilizing structure, but also further ensures the stable operation of the outer ring of the dual-variable combustion chamber, thereby achieving flame stabilization of the outer ring of the dual-variable combustion chamber.

[0043] Specifically, refer to Figure 1 , Figure 5 and Figure 6 In some embodiments of the present invention, the position of each first nozzle 30 is offset from the middle of the length direction of the outer casing 13, and each first nozzle 30 is located close to the inlet 111 of the pre-combustion channel 11. With the above structure, it can be understood that the distance between the first nozzle 30 and the outlet 112 of the pre-combustion channel 11 is greater than the distance between the first nozzle 30 and the inlet 111 of the pre-combustion channel 11. This stabilizes the flame at the outlet 112 of the pre-combustion channel 11, allowing the fuel to mix with air near the inlet 111 of the outer casing 13. This extends the travel and time of the fuel-air mixing sprayed by the first nozzle 30, which is beneficial for shortening the length of the dual-variable combustion chamber.

[0044] Specifically, in some embodiments of the present invention, the second nozzle 40 protrudes from the outer side wall of the support plate 14. This arrangement, with the second nozzle 40 being a protruding structure, facilitates greater penetration. Under the impact of the incoming airflow, a vortex is formed at the second nozzle 40, achieving atomization and evaporation, while simultaneously enhancing the uniformity of fuel-air mixing.

[0045] Understandably, referring to Figure 1 In this embodiment, the cross-sectional shape of the second nozzle 40 is trapezoidal, wherein one side wall of the second nozzle 40 relative to the air flow direction is inclined toward the outlet 112 of the pre-combustion channel 11 to facilitate better flame connection; of course, the shape of the second nozzle 40 is not limited here, and it can also be spherical or the like.

[0046] Specifically, refer to Figure 1 , Figure 3 and Figure 4In some embodiments of the present invention, a second nozzle 40 is arranged on each of the opposite side walls of each support plate 14. It can be understood that, through the above arrangement, the second nozzles 40 arranged on each of the opposite side walls of each support plate 14 face opposite directions, so as to improve the combustion effect on the opposite side walls of the support plate 14 and enhance the flame-coupling effect.

[0047] Specifically, in this embodiment, the second nozzles 40 on the opposite side walls of each support plate 14 are staggered along the direction of the support plate 14, which is beneficial to further improve the combustion effect of the opposite side walls of the support plate 14 and enhance the flame-coupling effect.

[0048] It should be noted that each of the above-mentioned support plates 14 has four second nozzles 40 arranged on its opposite side walls, and the second nozzles 40 on different sides of each support plate 14 face opposite directions.

[0049] Understandably, referring to Figure 1 , Figure 3 and Figure 4 In some embodiments of the present invention, there are four support plates 14. The outer shell 13 has a first direction and a second direction. Support plates 14 are respectively arranged along the opposite side walls of the outer shell 13 in the first direction and along the opposite side walls of the outer shell 13 in the second direction. Among them, the support plates 14 along the opposite side walls of the outer shell 13 in the second direction are arranged with third nozzles 50. It can be understood that in this embodiment, the first direction is the up-down direction and the second direction is the left-right direction. The opposite side walls of the support plates 14 in the first direction are provided with second nozzles 40 that spray oil in the left and right directions respectively. The opposite side walls of the support plates 14 in the second direction are provided with nozzles that spray oil in the up-down direction respectively, so as to achieve uniform mixing of fuel in space and enhance the effect of flame coupling. In addition, the two support plates 14 with third nozzles 50 are arranged alternately with the other two support plates 14. Thus, the combination method and combination position of the protruding second nozzles 40 and third nozzles 50 ensure the flame coupling under the combination mode of high flow intake conditions. The structure is simple, there is no mechanical stirring, continuous production is possible, the operating cost is low, and the mixing efficiency is high.

[0050] It should be noted that the cross section of the flame stabilizer body 10 is cross-shaped; the support plate 14 may also be five or six, etc. Of course, in some embodiments, it may also be two, which is not limited here; the support plate 14 corresponding to the two opposite side walls along the second direction of the outer shell 13 is provided with two third nozzles 50. The number of third nozzles 50 is not limited here. Each support plate 14 corresponding to the second direction may also be provided with one third nozzle 50, or three third nozzles 50, etc., which is not limited here.

[0051] Specifically, in some embodiments of the present invention, the support plate 14 and the outer shell 13 are an integral structure, which is simple in structure, easy to manufacture and install, and improves the structural stability of the fuel blending flame stabilization structure. It should be noted that the support plate 14 and the outer shell 13 can also be injection molded or welded to form an integral structure; of course, in some embodiments, the support plate 14 and the outer shell 13 are also detachably connected, which is not limited here.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fuel blending flame stabilization structure for the outer ring of a dual-variable combustion chamber, characterized in that, include: The flame stabilizing body (10) is provided with a pre-combustion channel (11) and multiple oil passages (12). The flame stabilizing body (10) includes an outer shell (13) and multiple support plates (14). The two opposite ends of the outer shell (13) are arranged to form the pre-combustion channel (11). The multiple support plates (14) are spaced apart and circumferentially arranged on the outer side wall of the outer shell (13). Each support plate (14) has an oil passage (12). One end of the pre-combustion channel (11) has an inlet (111) and the other end of the pre-combustion channel (11) has an outlet (112). The multiple oil passages (12) are spaced apart and circumferentially arranged around the pre-combustion channel (11). A cyclone separator (20) is provided in the pre-combustion channel (11). Multiple first nozzles (30) are disposed on the housing (13), each first nozzle (30) corresponds one-to-one with each oil passage (12), and the oil passage (12) is connected to the pre-combustion passage (11) through the first nozzle (30). Multiple second nozzles (40) are provided on the flame stabilizer body (10). The second nozzles (40) are used to contact and cooperate with air, and each oil passage (12) is provided with a corresponding second nozzle (40). The second nozzles (40) are connected to the oil passage (12). Multiple third nozzles (50) are provided on the flame stabilizer body (10). The third nozzles (50) are used to contact and cooperate with air, and at least a portion of the oil passage (12) is provided with corresponding third nozzles (50). The third nozzles (50) are connected to the oil passage (12). Each of the support plates (14) has a second nozzle (40) arranged on its opposite side walls. The second nozzles (40) arranged in adjacent oil passages (12) are oriented in the same direction as the third nozzle (50) and the outlet (112) of the pre-combustion passage (11). The second nozzle (40) is arranged on one side wall of each of the support plates (14) in a direction perpendicular to the center line of the pre-combustion channel (11) of the outer shell (13), and the third nozzle (50) is arranged on the other side wall of at least part of the support plates (14) in a direction perpendicular to the center line of the outer shell (13), and the second nozzle (40) and the third nozzle (50) are oriented to intersect each other. The position of each first nozzle (30) is offset from the middle of the length direction of the housing (13), and each first nozzle (30) is set close to the inlet (111) of the pre-combustion channel (11). The distance between the first nozzle (30) and the outlet (112) of the pre-combustion channel (11) is greater than the distance between the first nozzle (30) and the inlet (111) of the pre-combustion channel (11).

2. The fuel blending flame stabilizing structure according to claim 1, characterized in that, The second nozzle (40) protrudes from the outer side wall of the support plate (14).

3. The fuel blending flame stabilizing structure according to claim 1, characterized in that, The second nozzles (40) on the opposite side walls of each of the support plates (14) are staggered along the direction of the support plate (14).

4. The fuel blending flame stabilizing structure according to claim 1, characterized in that, There are four support plates (14). The outer shell (13) has a first direction and a second direction. The support plates (14) are arranged on opposite side walls along the first direction of the outer shell (13) and on opposite side walls along the second direction of the outer shell (13). The third nozzle (50) is arranged on the support plate (14) corresponding to the two opposite side walls along the second direction of the outer shell (13).

5. The fuel blending flame stabilizing structure according to claim 1 or 4, characterized in that, The support plate (14) and the outer shell (13) are an integral structure.

6. A dual-variable combustion chamber, characterized in that, Includes the fuel blending flame stabilizing structure as described in any one of claims 1 to 5.

7. An engine, characterized in that, Includes the dual-variable combustion chamber as described in claim 6.

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