CN115218218A - The head of the pre-combustion stage and the root of the flame are coupled with an adjustable central staging combustion chamber - Google Patents

Abstract

The invention relates to the technical field of combustion chambers, and provides a central grading combustion chamber with a pre-combustion stage head and a flame root coupling adjustable, wherein the pre-combustion stage head includes a first sleeve, a second sleeve and a pre-combustion stage nozzle; The inner wall surface of the first sleeve is enclosed to form a first airflow channel; the second sleeve is sleeved on the outer side of the first sleeve, and a gap is provided between the first sleeve and the second sleeve to form an airflow channel; The pre-combustion stage nozzle is arranged in the first air flow channel and is arranged close to one end of the first sleeve, and the pre-combustion stage nozzle is used for delivering fuel to the other end of the first sleeve along the axial direction of the first sleeve. The above-mentioned pre-combustion stage head is designed to regulate the coupling relationship between the main combustion stage flame and the pre-combustion stage flame root through a separate purge gas design, thereby ensuring the stability of the flame and reducing the emission of nitrogen oxides to meet the low emission requirements.

Description

The head of the pre-combustion stage and the root of the flame are coupled with an adjustable central staging combustion chamber

technical field

The invention relates to the technical field of combustion chambers, in particular to a central grading combustion chamber with a pre-combustion stage head and a flame root coupling adjustable.

Background technique

With the rapid development of the aviation and industrial gas turbine industries, environmental pollution problems also follow. In this regard, the International Civil Aviation Organization (ICAO) has proposed restrictive laws on the emission standards of aircraft pollutants, and continues to improve the emission standards, especially for nitrogen and oxygen gases. Emissions, the aircraft engine combustion chamber is the source of aircraft power and the main source of its pollution emissions. Therefore, high demands are placed on the design of the combustion chamber. Low emission combustion technology is one of the focuses of current research.

Center staged combustion chamber is one of the common low-emission combustion chamber structures at present. The center staged burner is arranged in radial stages along the central axis: the outer ring is the main combustion stage, and most of the air enters the burner through the main combustion stage, and is connected with the channel. The injected fuel is mixed to a certain extent in advance, and then enters the combustion chamber for combustion. Therefore, it appears as lean premixed combustion, which can ensure that the final emission of combustion reaches a lower level; the central inner ring is In the pre-combustion stage, a small part of the air enters the burner through the pre-combustion stage, and is directly mixed with the fuel injected from the downstream center body nozzle into the combustion chamber for combustion, showing the characteristics of oil-rich diffusion combustion, thus ensuring the overall flame stability and stability. ignition performance.

In the design of the existing central staged combustion chamber, the aerodynamic design parameters of the main combustion stage and the pre-combustion stage are usually relatively fixed. Therefore, the root coupling relationship between the main combustion stage and the pre-combustion stage is usually difficult to change. The coupling relationship at the root of the two will affect the emission and stability of combustion. In the prior art, the aero-thermal design parameters of the main and pre-combustion stages are usually directly changed. Although this method can change the coupling relationship at the root of the flame to a certain extent, However, it will also bring about changes in other aerodynamic structures, which is not conducive to the control of a single variable, and will cause the final combustion performance change effect to deviate from expectations.

SUMMARY OF THE INVENTION

The invention provides a pre-combustion stage head and flame root coupling adjustable central grading combustion chamber, to solve the problem in the prior art, the flame root coupling adjustable central grading combustion chamber main, pre-combustion stage flame root coupling free adjustment performance is poor , Defects that lead to poor emission performance and flame stability.

In a first aspect, the present invention provides a pre-combustion stage head, comprising: a first sleeve, a second sleeve and a pre-combustion stage nozzle;

The inner wall surface of the first sleeve encloses a first airflow channel; the second sleeve is sleeved on the outer side of the first sleeve, between the first sleeve and the second sleeve A gap is provided to form an air flow passage;

The pre-combustion stage nozzle is arranged in the first airflow channel and is arranged close to one end of the first sleeve, and the pre-combustion stage nozzle is used for delivering fuel along the axial direction of the first sleeve to the other end of the first sleeve.

According to a pre-combustion stage head provided by the present invention, the first sleeve includes a first horizontal portion, a first bent portion and a second bent portion;

The first horizontal portion is arranged on the outer wall side of the first sleeve and is arranged along the axial extension direction of the first sleeve, and the first bending portion is bent from one end of the first horizontal portion The second bending portion is formed by bending and extending from an end of the first bending portion away from the first horizontal portion.

According to a pre-combustion stage head provided by the present invention, the second sleeve includes a second horizontal portion, a third bent portion and a fourth bent portion;

The second horizontal portion is arranged on the inner wall side of the second sleeve and is arranged along the axial extension direction of the second sleeve, and the third bending portion is bent from one end of the second horizontal portion The fourth bending portion is formed by bending and extending from one end of the third bending portion away from the second horizontal portion.

According to a pre-combustion stage head provided by the present invention, the airflow path includes: a first airflow path, a second airflow path, and a third airflow path;

The second horizontal portion is arranged corresponding to the first horizontal portion to form the first air flow passage, and one end of the first air passage is provided with an air inlet; the third bent portion is connected to the first air passage. A bent portion is correspondingly disposed to form the second airflow passage; the fourth bent portion is disposed corresponding to the second bent portion to form the third airflow passage, and the third airflow passage is far away from the One end of the second air passage is provided with an air outlet.

According to a pre-combustion stage head provided by the present invention, the first outlet expansion angle of the second bending section is 30° to 120°.

According to a pre-combustion stage head provided by the present invention, the second outlet expansion angle of the fourth bending section is 30° to 120°.

According to a pre-combustion stage head provided by the present invention, the pre-combustion stage head includes a support member, the support member is arranged in the second air flow passage, the support member is provided with a through hole, and the through hole is formed in the support member. The holes are used for the passage of air.

According to a pre-combustion stage head provided by the present invention, the pre-combustion stage head further comprises a pre-combustion stage swirl element; the pre-combustion stage swirl element is provided between the pre-combustion stage nozzle and the first between the sleeves.

According to a pre-combustion stage head provided by the present invention, the pre-combustion stage swirl member includes a first connecting portion and a second connecting portion;

The first connection part is annular, the inner wall surface of the first connection part is fitted to the outer wall surface of the pre-combustion stage nozzle, and the second connection part is connected to the outer wall surface of the first connection part;

Wherein, there are a plurality of the second connection parts, and the plurality of the second connection parts are sequentially arranged along the circumferential direction of the first connection part.

In a second aspect, the present invention also provides a flame root coupling adjustable central staging combustion chamber, which is characterized by comprising: a main combustion stage head and the pre-combustion stage head according to any one of the first aspects;

The main combustion stage head includes: an interstage sleeve, a main combustion stage swirl member and a third sleeve; the interstage sleeve is sleeved on the second sleeve of the pre-combustion stage head. Outside, the third sleeve is sleeved on the outside of the interstage sleeve, a second airflow channel is formed between the third sleeve and the interstage sleeve, and the main combustion stage swirl flow The component is arranged in the second airflow channel.

In the pre-combustion stage head provided by the present invention, the inner wall surface of the first sleeve encloses a first air flow channel, the pre-combustion stage nozzle is arranged in the first air flow channel, and the fuel is sprayed to the first air flow channel through the pre-combustion stage nozzle. Into the incoming air flow, further, the pre-combustion stage flame is coupled with the root of the main combustion stage flame, and the first sleeve and the second sleeve are sleeved to form an air flow passage, through which the root of the pre-combustion stage flame can be reached. Air blowing can regulate the coupling relationship between the main combustion stage flame and the pre-combustion stage flame root, thereby ensuring the stability of the flame and reducing the emission of nitrogen oxides to meet the needs of low emissions. Therefore, the pre-combustion stage head provided by the present invention can effectively ensure the stability of the flame, improve the low emission performance, and has a simple structure, convenient assembly and low processing cost.

Further, the flame root coupling adjustable center stage combustion chamber provided by the present invention has the same advantages as mentioned above because of the pre-combustion stage head as mentioned above.

In addition to the technical problems solved by the present invention described above, the technical features of the constituted technical solutions, and the advantages brought by the technical features of these technical solutions, other technical features of the present invention and the advantages brought by these technical features, Further description will be made in conjunction with the accompanying drawings, or learned through practice of the present invention.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is one of the cross-sectional structural schematic diagrams of the pre-combustion stage head provided by an embodiment of the present invention;

2 is the second schematic diagram of the cross-sectional structure of the pre-combustion stage head provided by the embodiment of the present invention;

3 is a partial structural schematic diagram of a pre-combustion stage head provided by an embodiment of the present invention;

Fig. 4 is one of the structural schematic diagrams of the flame root coupling adjustable central staging combustion chamber according to the embodiment of the present invention;

5 is a schematic cross-sectional structure diagram of a flame root coupling adjustable central staging combustion chamber provided by an embodiment of the present invention;

6 is the second structural schematic diagram of the flame root coupling adjustable central staging combustion chamber according to the embodiment of the present invention;

Reference number:

1: pre-combustion stage head; 11: first sleeve; 111: first horizontal part; 112: first bent part; 113: second bent part; 12: second sleeve; 121: second horizontal part 122: the third bent part; 123: the fourth bent part; 13: the pre-combustion stage nozzle; 14: the pre-combustion stage swirl part; 141: the first connecting part; 142: the second connecting part; 15: supporting item;

2: Main combustion stage head 2; 21: Interstage sleeve; 22: Main combustion stage swirl part; 23: Third sleeve;

A: The first air flow passage; B: The air flow passage; C: The second air flow passage; I: The air inlet; II: The air outlet; a: The first outlet expansion angle; b: The second outlet expansion angle.

Detailed ways

The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right" , "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing this Inventive embodiments and simplified descriptions are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the embodiments of the present invention.

Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, Or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present invention in specific situations.

In the embodiments of the present invention, unless otherwise expressly specified and limited, the first feature "above" or "under" the second feature may be in direct contact with the first and second features, or the first and second features pass through the middle indirect contact with the media. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In addition, in the description of the embodiments of the present invention, unless otherwise specified, "multiple", "multiple" and "multiple groups" mean two or more, "several", "several", "Groups" means one or more than one.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structures, materials, or features are included in at least one example or example of embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

The following describes the pre-combustion stage head 1 and the flame root coupling adjustable central staging combustion chamber provided by the embodiment of the present invention with reference to FIG. 1 to FIG. 6 .

In the first aspect, as shown in FIGS. 1 to 3 , the pre-combustion stage head 1 in the embodiment of the present invention includes: a first sleeve 11 , a second sleeve 12 and a pre-combustion stage nozzle 13 .

The inner wall surface of the first sleeve 11 encloses the first air flow channel A; the second sleeve 12 is sleeved on the outer side of the first sleeve 11, and a gap is provided between the first sleeve 11 and the second sleeve 12, To construct and form the airflow channel B.

The pre-combustion stage nozzle 13 is arranged in the first airflow channel A, and is arranged close to one end of the first sleeve 11 , and the pre-combustion stage nozzle 13 is used to deliver fuel to the first sleeve along the axial direction of the first sleeve 11 . the other end of 11.

Specifically, as shown in FIG. 3 , the overall structure of the pre-combustion stage head 1 is cylindrical, that is, the first sleeve 11 and the second sleeve 12 are both annular structures.

As shown in FIG. 1 , the pre-combustion stage nozzle 13 is arranged in the innermost layer of the pre-combustion stage head 1 , and the first sleeve 11 and the second sleeve 12 are sequentially sleeved on the pre-combustion stage nozzle 13 along the radial extending direction. outside.

The axial extension lengths of the first sleeve 11 and the second sleeve 12 are approximately the same, and the axial extension length of the pre-combustion stage nozzle 13 is smaller than the lengths of the first sleeve 11 and the second sleeve 12, as shown in FIG. 1 . As shown, the inner cavity formed by the inner wall surface of the first sleeve 11 is the first airflow channel A, and the pre-combustion stage nozzle 13 is arranged on the left side of the first airflow channel A.

A gap is formed between the first sleeve 11 and the second sleeve 12, and the gap is the airflow path B for the airflow to enter the combustion chamber and to control the coupling of the main combustion stage flame and the pre-combustion stage flame. Air blowing can make the air flow between the main combustion stage flame and the pre-combustion stage flame, so the coupling relationship between the main combustion stage flame and the pre-combustion stage flame can be adjusted.

In the pre-combustion stage head 1 provided by the embodiment of the present invention, the inner wall of the first sleeve 11 encloses a first air flow channel A, and the pre-combustion stage nozzle 13 is arranged in the first air flow channel A, passing through the pre-combustion stage nozzle 13 The fuel is injected to the first and circulated into the injected air flow, further, the pre-combustion stage flame is coupled with the main combustion stage flame root, and the first sleeve 11 and the second sleeve 12 are sleeved to form an air flow path B, Through the airflow path B, air can be blown to the root of the pre-combustion stage flame, and the coupling relationship between the main combustion stage flame and the pre-combustion stage flame can be regulated, thereby ensuring the stability of the flame and reducing the emission of nitrogen oxides. demand. Therefore, the pre-combustion stage head 1 provided by the present invention can effectively ensure the stability of the flame, improve the low emission performance, and has a simple structure, convenient assembly and low processing cost.

In an optional embodiment, the first sleeve 11 includes a first horizontal portion 111 , a first bent portion 112 and a second bent portion 113 .

The first horizontal portion 111 is disposed on the outer wall side of the first sleeve 11 and is disposed along the axial extension direction of the first sleeve 11 . The first bending portion 112 is formed by bending and extending from one end of the first horizontal portion 111 . The two bending portions 113 are formed by bending and extending from one end of the first bending portion 112 away from the first horizontal portion 111 .

Specifically, as shown in FIG. 2 , a first horizontal part 111 , a first bending part 112 and a second bending part 113 are sequentially arranged on the outer wall side of the first sleeve 11 along the axial direction thereof, wherein the first The horizontal portion 111 extends along the axial extension direction of the first sleeve 11 , and a first bending portion 112 is formed by bending and extending toward the axial direction of the first sleeve 11 at the end point of the first horizontal portion 111 . The closing angle of the folded portion 112 is not specifically limited, and can be bent and set according to actual needs, so as to realize the circulation of gas.

A second bent portion 113 is formed at the end of the first bent portion 112 away from the axial direction of the first sleeve 11 , and is formed by expanding and bending outward. As a result, as shown in FIG. 2 , the The right end is flared.

In an optional embodiment, the second sleeve 12 includes a second horizontal portion 121 , a third bending portion 122 and a fourth bending portion 123 .

The second horizontal portion 121 is disposed on the inner wall side of the second sleeve 12 and is disposed along the axial extension direction of the second sleeve 12 . The third bending portion 122 is formed by bending and extending from one end of the second horizontal portion 121 . The four bending parts 123 are formed by bending and extending from one end of the third bending part 122 away from the second horizontal part 121 .

Specifically, as shown in FIG. 2 , corresponding to the first sleeve 11 , a second horizontal portion 121 , a third bending portion 122 and a fourth The bending portion 123, wherein the second horizontal portion 121 extends along the axial extension direction of the second sleeve 12, and the length of the second horizontal portion 121 may be the same as that of the first horizontal portion 111 as shown in FIG. It can be set to be longer or shorter than the length of the second horizontal portion 121 as required, the specific length is not limited, and a gap can be formed with the first horizontal portion 111 for gas circulation.

A third bending portion 122 is formed by bending and extending toward the axial direction of the first sleeve 11 at the end point of the second horizontal portion 121 . The closing angle of the third bending portion 122 is not specifically limited, and the third bending portion 122 may be As shown in FIG. 2, it is parallel to the first bending portion 112, or it may not be parallel. The specific setting method is set according to actual needs, ensuring that a gap is formed between the third bending portion 122 and the first bending portion 112 for gas supply. It can be circulated.

A fourth bending portion 123 is formed at the end of the third bending portion 122 away from the axial direction of the first sleeve 11, expanding and bending outward. 2 is arranged in parallel with the third bending portion 122 , but may not be parallel. Therefore, as shown in FIG. 2 , the right end portion of the second sleeve 12 is also flared.

Further, the airflow path B includes: a first airflow path, a second airflow path, and a third airflow path.

The second horizontal portion 121 is arranged corresponding to the first horizontal portion 111 to form a first air flow passage. As shown in FIG. 2 , an air inlet I is provided at one end of the first air flow passage. The entire annular through hole that the passage passes through can also be as shown in FIG. 3 . A plurality of small through holes are arranged along the circumferential direction of the first sleeve 11 as the air inlets I, and the number and size of the air inlets I are not specifically limited. , In actual operation, by changing the number and aperture of the air inlet I, the air volume of the blowing can be changed. The number of air inlets I is preferably 10 to 50, and its aperture is preferably 0.5 to 3mm, of course, other numbers and apertures are also possible.

The third bent portion 122 is disposed correspondingly to the first bent portion 112 to form a second airflow passage, and the airflow enters the second airflow passage through the first airflow passage.

The fourth bent portion 123 is disposed correspondingly to the second bent portion 113 to form a third air flow passage. The end of the third air passage away from the second air passage is provided with an air outlet II, and the air passing through the second air passage can pass through in turn. The third air flow passage and the air outlet II are ejected.

In an optional embodiment, the first outlet expansion angle a of the second bending section is 30° to 120°.

The second outlet expansion angle b of the fourth bending section is 30° to 120°.

Specifically, as shown in FIG. 2 , the end of the second bending section is the first outlet expansion angle a, and the end of the fourth bending section is the second outlet expansion angle b.

By changing the angle of the first outlet expansion angle a of the second bending section, the angle parameter range is 30-120°, and the root coupling position of the pre-burning stage flame can be changed independently.

By changing the angle of the second outlet expansion angle b of the fourth bending section, the angle parameter range is 30-120°, and the root coupling position of the main combustion stage flame can be changed independently.

At the same time, change the angle of the first outlet expansion angle a of the second bending section and the second outlet expansion angle b of the fourth bending section, that is, change the gap size and the gap expansion angle of the second bending section and the fourth bending section. , which can change the root coupling relationship between the main combustion stage flame and the pre-combustion stage flame, so as to control the flame of the combustion chamber.

The purging structure of the pre-combustion stage head 1 provided by the embodiment of the present invention is designed independently, and can be processed separately. The same swirl vane scheme is combined for testing, which is convenient for adjustment and design.

In an optional embodiment, the pre-combustion stage head 1 includes a support member 15, the support member 15 is arranged in the second airflow passage, and the support member 15 is provided with a through hole, and the through hole is used for the airflow to pass through.

Specifically, in order to ensure the strength of the overall structure, the airflow can be continuously blown into the flame root through the airflow path B. As shown in Figures 1 and 2, a support member 15 is provided in the second airflow path, and the support member 15 can be provided with It is a grid structure, or a large through hole or a plurality of small through holes are arranged on the support member 15 to ensure the passage of the air flow while supporting the second air flow passage.

In an optional embodiment, in order to promote uniform mixing of the gas in the first airflow channel A and the fuel injected by the pre-combustion stage nozzles 13, the pre-combustion stage head 1 is further provided with a pre-combustion stage swirl member 14; The stage swirl member 14 is provided between the pre-combustion stage nozzle 13 and the first sleeve 11 .

Further, the pre-combustion stage swirl member 14 includes a first connecting portion 141 and a second connecting portion 142 .

The first connecting portion 141 is annular, the inner wall surface of the first connecting portion 141 is attached to the outer wall surface of the pre-combustion stage nozzle 13 , and the second connecting portion 142 is connected to the outer wall surface of the first connecting portion 141 .

Wherein, there are multiple second connecting portions 142 , and the multiple second connecting portions 142 are sequentially arranged along the circumferential direction of the first connecting portion 141 .

In the second aspect, as shown in FIG. 4 to FIG. 6 , an embodiment of the present invention further provides a flame root coupling adjustable center staged combustion chamber, including: a main combustion stage head 2 and the pre-combustion as described in the first aspect above Stage Head 1.

The main combustion stage head 2 includes: an interstage sleeve 21 , a main combustion stage swirl member 22 and a third sleeve 23 ; the interstage sleeve 21 is sleeved on the second sleeve 12 of the pre-combustion stage head 1 The third sleeve 23 is sleeved on the outer side of the interstage sleeve 21, the second airflow channel C is formed between the third sleeve 23 and the interstage sleeve 21, and the main combustion stage swirl member 22 is provided in the in the second airflow channel C.

Specifically, as shown in FIG. 4 , the main combustion stage head 2 is sleeved on the outer side of the second sleeve 12 of the pre-combustion stage head 1, and the overall structure is cylindrical, and the main combustion stage head 2 also has a cylindrical structure .

As shown in FIG. 5 , the interstage sleeve 21 in the main combustion stage head 2 is sleeved on the outer side of the second sleeve 12 of the pre-combustion stage head 1, and the main combustion stage rotary sleeves are sequentially arranged along the radial direction thereof. The flow element 22 and the third sleeve 23 are provided with a gap between the third sleeve 23 and the interstage sleeve 21 to form a second gas flow channel C, which is used as a gas flow channel for the main combustion stage.

As shown in Figures 5 and 6, the airflow passage B is located between the first airflow passage A and the second airflow passage C. By changing the air volume and purging angle of the pneumatic purge gas, other aerodynamic design parameters can be changed without changing. The premise is that only the coupling relationship between the main and pre-combustion stage roots is changed or only the flame root of the pre-combustion stage is changed.

In addition, the flame root coupling adjustable central grading combustion chamber provided by the embodiment of the present invention only needs to replace the pre-combustion stage sleeve, which can be manufactured by 3D printing, with low cost; the assembly is also relatively simple and direct Just do welding.

It should be noted that, since the flame root coupling adjustable central staging combustion chamber includes the pre-combustion stage head 1 shown in the above-mentioned embodiment, the specific structure of the pre-combustion stage head 1 refers to the above-mentioned embodiment. The tunable central staging combustion chamber adopts the technical solutions of the above-mentioned embodiments, and therefore at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A pre-combustion stage head, characterized in that it comprises: a first sleeve, a second sleeve and a pre-combustion stage nozzle; The inner wall surface of the first sleeve encloses a first airflow channel; the second sleeve is sleeved on the outer side of the first sleeve, between the first sleeve and the second sleeve A gap is provided to form an air flow passage; The pre-combustion stage nozzle is arranged in the first airflow channel and is arranged close to one end of the first sleeve, and the pre-combustion stage nozzle is used for delivering fuel along the axial direction of the first sleeve to the other end of the first sleeve. 2. The pre-combustion stage head according to claim 1, wherein the first sleeve comprises a first horizontal portion, a first bent portion and a second bent portion; The first horizontal portion is arranged on the outer wall side of the first sleeve and is arranged along the axial extension direction of the first sleeve, and the first bending portion is bent from one end of the first horizontal portion The second bending portion is formed by bending and extending from one end of the first bending portion away from the first horizontal portion. 3. The pre-combustion stage head according to claim 2, wherein the second sleeve comprises a second horizontal portion, a third bent portion and a fourth bent portion; The second horizontal portion is arranged on the inner wall side of the second sleeve and is arranged along the axial extension direction of the second sleeve, and the third bending portion is bent from one end of the second horizontal portion The fourth bending portion is formed by bending and extending from one end of the third bending portion away from the second horizontal portion. 4. The pre-combustion stage head according to claim 3, wherein the airflow passage comprises: a first airflow passage, a second airflow passage and a third airflow passage; The second horizontal portion is arranged corresponding to the first horizontal portion to form the first air flow passage, and one end of the first air passage is provided with an air inlet; the third bent portion is connected to the first air passage. A bent portion is correspondingly disposed to form the second airflow passage; the fourth bent portion is disposed corresponding to the second bent portion to form the third airflow passage, and the third airflow passage is far away from the One end of the second air passage is provided with an air outlet. 5 . The pre-combustion stage head according to claim 4 , wherein the first outlet expansion angle of the second bending section is 30° to 120°. 6 . 6 . The pre-combustion stage head according to claim 4 , wherein the second outlet expansion angle of the fourth bending section is 30° to 120°. 7 . 7 . The pre-combustion stage head according to claim 4 , wherein the pre-combustion stage head comprises a support member, the support member is provided in the second airflow passage, and the support member is provided with a support member. 8 . Through holes, the through holes are used for the passage of air. 8 . The pre-combustion stage head according to claim 1 , wherein the pre-combustion stage head further comprises a pre-combustion stage swirl member; the pre-combustion stage swirl member is provided on the pre-combustion stage. 9 . between the nozzle and the first sleeve. 9. The pre-combustion stage head according to claim 8, wherein the pre-combustion stage swirl member comprises a first connecting portion and a second connecting portion; The first connection part is annular, the inner wall surface of the first connection part is fitted to the outer wall surface of the pre-combustion stage nozzle, and the second connection part is connected to the outer wall surface of the first connection part; Wherein, there are a plurality of the second connection parts, and the plurality of the second connection parts are sequentially arranged along the circumferential direction of the first connection part. 10. A flame root coupling adjustable central staging combustion chamber, characterized in that it comprises: a main combustion stage head and a pre-combustion stage head according to any one of claims 1 to 9; The main combustion stage head includes: an interstage sleeve, a main combustion stage swirl member and a third sleeve; the interstage sleeve is sleeved on the second sleeve of the pre-combustion stage head. Outside, the third sleeve is sleeved on the outside of the interstage sleeve, a second airflow channel is formed between the third sleeve and the interstage sleeve, and the main combustion stage swirl flow The component is arranged in the second airflow channel.

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