CN115218218A - Pre-combustion stage head and flame root coupling adjustable central staged combustion chamber - Google Patents
Pre-combustion stage head and flame root coupling adjustable central staged combustion chamber Download PDFInfo
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- CN115218218A CN115218218A CN202210730274.0A CN202210730274A CN115218218A CN 115218218 A CN115218218 A CN 115218218A CN 202210730274 A CN202210730274 A CN 202210730274A CN 115218218 A CN115218218 A CN 115218218A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/283—Attaching or cooling of fuel injecting means including supports for fuel injectors, stems, or lances
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/38—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising rotary fuel injection means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention relates to the technical field of combustion chambers, and provides a precombustion stage head and flame root coupling adjustable central staged combustion chamber, wherein the precombustion stage head comprises a first sleeve, a second sleeve and a precombustion stage nozzle; the inner wall surface of the first sleeve encloses to form a first air flow channel; the second sleeve is sleeved outside the first sleeve, and a gap is formed between the first sleeve and the second sleeve to form an air flow passage; the pre-combustion stage nozzle is arranged in the first air flow passage and close to one end of the first sleeve, and the pre-combustion stage nozzle is used for conveying fuel oil to the other end of the first sleeve along the axial direction of the first sleeve. The precombustion stage head regulates and controls the coupling relation between the main combustion stage flame and the precombustion stage flame root through the design of independent scavenging gas, thereby ensuring the stability of flame, reducing the emission of nitrogen oxides and meeting the requirement of low emission.
Description
Technical Field
The invention relates to the technical field of combustion chambers, in particular to a precombustion stage head and flame root coupling adjustable central staged combustion chamber.
Background
With the rapid development of the aviation and industrial gas turbine industries, the problem of environmental pollution comes along, and for this reason, the international civil aviation organization sets forth restrictive laws about the emission standards of pollutants of aircrafts and continuously improves the emission standards, especially the emission of nitrogen and oxygen gases, and the combustion chamber of the aircraft engine is the source of power of the aircraft and also the main source of pollution emission thereof. Therefore, high demands are placed on the design of the combustion chamber. Low emission combustion technology is one of the focuses of current research.
One of the low-emission combustion chamber structures commonly seen in the center staged combustion chamber at present, the center staged combustor is arranged in a radial stage along the center axial direction: the outer ring is a main combustion stage, most of air enters the combustor through the main combustion stage, is mixed with fuel oil injected into the channel to a certain degree in advance, and then enters the combustion chamber for combustion, so that lean premixed combustion is realized, and the output of emissions finally generated by combustion can be guaranteed to reach a lower level; the central inner ring is a precombustion stage, a small part of air enters the combustor through the precombustion stage and directly enters the combustion chamber with fuel sprayed from a downstream central body nozzle to be mixed and combusted, and the characteristic of rich-oil diffusion combustion is presented, so that the stability of overall flame and the flameout performance are ensured.
In the design of the existing central staged combustion chamber, the requirements of the pneumatic and thermal design parameters of the main combustion stage and the pre-combustion stage are usually fixed, therefore, the root coupling relationship of the flames of the main combustion stage and the pre-combustion stage is also difficult to change, and the root coupling relationship of the main combustion stage and the pre-combustion stage can influence the emission and the stability of combustion.
Disclosure of Invention
The invention provides a precombustion stage head and flame root coupling adjustable central staged combustion chamber, which is used for solving the defects of poor emission performance and poor flame stability caused by poor free coupling adjustment performance of a main flame root coupling and a precombustion stage flame root coupling of the flame root coupling adjustable central staged combustion chamber in the prior art.
In a first aspect, the present invention provides a pre-combustion stage head comprising: the device comprises 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 air flow channel; the second sleeve is sleeved outside the first sleeve, and a gap is formed between the first sleeve and the second sleeve to form an air flow passage;
the pre-combustion stage nozzle is arranged in the first air flow passage and close to one end of the first sleeve, and the pre-combustion stage nozzle is used for conveying fuel to the other end of the first sleeve along the axial direction of the first sleeve.
According to the head part of the pre-burning stage provided by the invention, the first sleeve comprises a first horizontal part, a first bent part and a second bent part;
the first horizontal portion is arranged on the outer wall side of the first sleeve and is arranged along the axial extending direction of the first sleeve, the first bending portion is formed by bending and extending one end of the first horizontal portion, and the second bending portion is formed by bending and extending one end of the first bending portion far away from the first horizontal portion.
According to the precombustion stage head provided by the invention, the second sleeve comprises a second horizontal part, a third bending part and a fourth bending part;
the second horizontal part is arranged on the inner wall side of the second sleeve and is arranged along the axial extension direction of the second sleeve, the third bending part is formed by bending and extending one end of the second horizontal part, and the fourth bending part is formed by bending and extending one end of the third bending part far away from the second horizontal part.
According to the present invention there is provided a pre-combustion stage head, the airflow path comprising: a first air flow path, a second air flow path, and a third air flow path;
the second horizontal part and the first horizontal part are correspondingly arranged to form the first air flow passage, and one end of the first air flow passage is provided with an air inlet; the third bent part and the first bent part are arranged correspondingly to form the second airflow passage; the fourth bending part and the second bending part are correspondingly arranged to form the third airflow channel, and an air outlet is formed in one end, far away from the second airflow channel, of the third airflow channel.
According to the precombustion stage head provided by the invention, the first outlet expansion angle of the second bending section is 30-120 degrees.
According to the head part with the precombustion stage, the second outlet divergence angle of the fourth bending section is 30-120 degrees.
According to the invention, a pre-combustion stage head is provided, which comprises a support part, which is arranged in the second air flow passage and is provided with a through hole for the air flow to pass through.
According to the invention, the pre-combustion stage head also comprises a pre-combustion stage rotational flow piece; the pre-combustion stage rotational flow piece is arranged between the pre-combustion stage nozzle and the first sleeve.
According to the head part of the pre-combustion stage provided by the invention, the pre-combustion stage rotational flow piece comprises a first connecting part and a second connecting part;
the first connecting part is annular, the inner wall surface of the first connecting part is attached to the outer wall surface of the pre-combustion stage nozzle, and the second connecting part is connected to the outer wall surface of the first connecting part;
the second connecting parts are arranged in sequence along the circumferential direction of the first connecting part.
In a second aspect, the present invention further provides a flame base coupling adjustable central staged combustor, comprising: a main stage head and a pre-stage head as described in any of the first aspects;
the primary combustion stage head includes: the device comprises a stage section sleeve, a main combustion stage cyclone piece and a third sleeve; the stage section sleeve is sleeved on the outer side of the second sleeve of the pre-combustion stage head, the third sleeve is sleeved on the outer side of the stage section sleeve, a second airflow channel is formed between the third sleeve and the stage section sleeve, and the main combustion stage rotational flow piece is arranged in the second airflow channel.
According to the precombustion stage head, the inner wall surface of the first sleeve is enclosed to form the first air flow channel, the precombustion stage nozzle is arranged in the first air flow channel, fuel oil is sprayed to the first air flow channel through the precombustion stage nozzle and flows into the injected air incoming flow, further, the precombustion stage flame is coupled with the root of the main combustion stage flame, the first sleeve and the second sleeve are sleeved to form the air flow channel, air can be blown to the root of the precombustion stage flame through the air flow channel, the coupling relation between the main combustion stage flame and the precombustion stage flame root can be regulated and controlled, the stability of flame and the emission reduction of nitrogen oxides are ensured, and the requirement of low emission is met. Therefore, the pre-combustion stage head provided by the invention can effectively guarantee the stability of flame, improves the low-emission performance, and has the advantages of simple structure, convenience in assembly and low processing cost.
Further, the flame root coupling adjustable central staged combustion chamber provided by the invention has the same advantages as the flame root coupling adjustable central staged combustion chamber due to the pre-combustion stage head part as the flame root coupling adjustable central staged combustion chamber.
In addition to the technical problems addressed by the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical features of the present invention and the advantages brought by the technical features of the present invention will be further described with reference to the accompanying drawings or will be understood by practice of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a cross-sectional view of a head of a pre-combustion stage according to an embodiment of the present invention;
FIG. 2 is a second schematic cross-sectional view of a head of a pre-combustion stage according to an embodiment of the present invention;
FIG. 3 is a partial schematic structural view of a precombustion stage head provided in an embodiment of the present invention;
FIG. 4 is a schematic structural view of a flame root coupled adjustable central staged combustor according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a flame root coupled adjustable central staged combustion chamber according to an embodiment of the present invention;
FIG. 6 is a second schematic view of a flame root coupled adjustable center staged combustor according to an embodiment of the present invention;
reference numerals:
1: a pre-combustion stage head; 11: a first sleeve; 111: a first horizontal portion; 112: a first bent portion; 113: a second bent portion; 12: a second sleeve; 121: a second horizontal portion; 122: a third bent portion; 123: a fourth bent portion; 13: a pre-combustion stage nozzle; 14: a pre-combustion stage swirl member; 141: a first connection portion; 142: a second connecting portion; 15: a support member;
2: a primary combustion stage head 2;21: a stage section sleeve; 22: a primary combustion stage swirl element; 23: a third sleeve;
a: a first air flow passage; b: an air flow path; c: a second airflow channel; i: an air inlet; II: an air outlet; a: a first outlet divergence angle; b: a second outlet divergence angle.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "central", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, 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 are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Further, in the description of the embodiments of the present invention, unless otherwise specified, "a plurality", and "a plurality" mean two or more, and "a plurality", "several", and "several groups" mean one or more.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The precombustion stage head 1 and the flame base coupling adjustable central staged combustion chamber provided by the embodiment of the invention are described below with reference to fig. 1 to 6.
In a first aspect, as shown in fig. 1 to 3, a precombustion stage head 1 in an embodiment of the present invention includes: a first sleeve 11, a second sleeve 12 and a pre-stage nozzle 13.
The inner wall surface of the first sleeve 11 is enclosed to form a first air flow passage A; the second sleeve 12 is sleeved outside the first sleeve 11, and a gap is formed between the first sleeve 11 and the second sleeve 12 to form an airflow path B.
The pre-combustion stage nozzle 13 is arranged in the first air flow passage a and near one end of the first sleeve 11, and the pre-combustion stage nozzle 13 is used for conveying fuel to the other end of the first sleeve 11 along the axial direction of the first sleeve 11.
Specifically, as shown in fig. 3, the whole structure of the precombustion 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 disposed at the innermost layer of the pre-combustion stage head 1, and the first sleeve 11 and the second sleeve 12 are sequentially sleeved outside the pre-combustion stage nozzle 13 along the radial extending direction.
As shown in fig. 1, an inner cavity formed by an inner wall surface of the first sleeve 11 is a first air flow passage a, and the pre-combustion stage nozzle 13 is disposed on the left side of the first air flow passage a.
A gap is formed between the first sleeve 11 and the second sleeve 12, the gap is an airflow passage B for airflow to enter the combustion chamber and control the coupling condition of the main combustion stage flame and the pre-combustion stage flame root, and the airflow can be enabled to be between the main combustion stage flame and the pre-combustion stage flame by blowing through the airflow passage B, so that the coupling relationship of the main combustion stage flame and the pre-combustion stage flame root can be regulated and controlled.
According to the precombustion stage head 1 provided by the embodiment of the invention, the inner wall surface of the first sleeve 11 is enclosed to form the first air flow passage A, the precombustion stage nozzle 13 is arranged in the first air flow passage A, fuel is sprayed to the first air flow through the precombustion stage nozzle 13 and flows into the injected air incoming flow, further, the precombustion stage flame is coupled with the root of the main combustion stage flame, the first sleeve 11 and the second sleeve 12 are sleeved to form the air flow passage B, and air can be blown to the root of the precombustion stage flame through the air flow passage B, so that the coupling relation between the main combustion stage flame and the precombustion stage flame root can be regulated and controlled, the stability of flame is ensured, the emission of nitrogen oxides is reduced, and the requirement of low emission is met. Therefore, the pre-combustion stage head part 1 provided by the invention can effectively guarantee the stability of flame, improves the low-emission performance, and has the advantages of simple structure, convenience in assembly and low processing cost.
In an alternative 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 an outer wall of the first sleeve 11 and is disposed along an axial extending direction of the first sleeve 11, the first bending portion 112 is formed by bending and extending from an end of the first horizontal portion 111, and the second bending portion 113 is formed by bending and extending from an end of the first bending portion 112 away from the first horizontal portion 111.
Specifically, as shown in fig. 2, a first horizontal portion 111, a first bending portion 112, and a second bending portion 113 are sequentially disposed on the outer wall side of the first sleeve 11 along the axial direction thereof, wherein the first horizontal portion 111 extends along the axial extending direction of the first sleeve 11, the first bending portion 112 is formed at the end point of the first horizontal portion 111 by bending and extending toward the axial direction of the first sleeve 11, the closing angle of the first bending portion 112 is not specifically limited, and the first bending portion may be disposed by bending according to actual needs, so that the gas can circulate.
A second bent portion 113 is formed at an end of the first bent portion 112 extending away from the axial direction of the first sleeve 11, so that the right end of the first sleeve 11 is flared as shown in fig. 2.
In an alternative embodiment, the second sleeve 12 includes a second horizontal portion 121, a third bent portion 122 and a fourth bent portion 123.
The second horizontal portion 121 is disposed on the inner wall of the second sleeve 12 and is disposed along the axial extending 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, and the fourth bending portion 123 is formed by bending and extending from one end of the third bending portion 122 away from the second horizontal portion 121.
Specifically, as shown in fig. 2, a second horizontal portion 121, a third bent portion 122 and a fourth bent portion 123 are sequentially disposed on the inner wall side of the second sleeve 12 along the axial direction thereof, corresponding to the first sleeve 11, wherein the second horizontal portion 121 extends along the axial extension direction of the second sleeve 12, the length of the second horizontal portion 121 may be the same as the length of the first horizontal portion 111 as shown in fig. 2, or may be longer or shorter than the length of the second horizontal portion 121 as needed, and the specific length is not limited, so that a gap can be formed between the second horizontal portion 121 and the first horizontal portion 111, and the gas can be circulated.
The third bending portion 122 is formed at the end point of the second horizontal portion 121 and bent and extended toward the axial direction of the first sleeve 11, the closing angle of the third bending portion 122 is not limited specifically, the third bending portion 122 may be parallel to the first bending portion 112 as shown in fig. 2, or may not be parallel to the first bending portion 112, and the specific arrangement manner is set according to actual needs, so as to ensure that a gap is formed between the third bending portion 122 and the first bending portion 112, so as to allow the gas to circulate.
The end of the third bent portion 122 is away from the axial direction of the first sleeve 11, and is bent and extended outward to form a fourth bent portion 123, as mentioned above, the fourth bent portion 123 may be arranged in parallel with the third bent portion 122 as shown in fig. 2, or may not be parallel, so that, as shown in fig. 2, the right end of the second sleeve 12 is also flared.
Further, the air flow path B includes: a first air flow passage, a second air flow passage and a third air flow passage.
The second horizontal portion 121 is disposed corresponding to the first horizontal portion 111 to form a first air flow path, as shown in fig. 2, one end of the first air flow path is provided with an air inlet I, the air inlet I may be an entire annular through hole penetrating through the first air flow path, or as shown in fig. 3, a plurality of small through holes are disposed along the circumferential direction of the first sleeve 11 as the air inlet I, the number and size of the air inlets I are not particularly limited, and in actual operation, the amount of air blown can be changed by changing the number and the diameter of the air inlets I. The number of the air inlets I is preferably 10 to 50, and the aperture thereof is preferably 0.5 to 3mm, although other numbers and apertures are possible.
The third bending portion 122 is disposed corresponding to the first bending portion 112 to form a second airflow path, and the airflow passes through the first airflow path and enters the second airflow path.
The fourth bending part 123 is disposed corresponding to the second bending part 113 to form a third airflow channel, an air outlet II is disposed at an end of the third airflow channel away from the second airflow channel, and the airflow passing through the second airflow channel can be ejected through the third airflow channel and the air outlet II in sequence.
In an alternative embodiment, the first exit divergence angle a of the second bend section is between 30 and 120 °.
The second outlet divergence angle b of the fourth bending section is 30-120 degrees.
Specifically, as shown in FIG. 2, the end of the second bend segment is at a first exit divergence angle a and the end of the fourth bend segment is at a second exit divergence angle b.
The root coupling position of the pre-combustion stage flame can be changed independently by changing the angle of the first outlet divergence angle a of the second bending section, wherein the angle parameter range is 30-120 degrees.
The root coupling position of the main combustion stage flame can be independently changed by changing the angle of the second outlet expansion angle b of the fourth bending section, wherein the angle parameter range is 30-120 degrees.
Simultaneously, the angles of the first outlet expansion angle a of the second bending section and the second outlet expansion angle b of the fourth bending section are changed, namely the gap size and the gap expansion angle of the second bending section and the fourth bending section are changed, the root coupling relation of the main combustion level flame and the pre-combustion level flame can be changed, and therefore the flame of the combustion chamber is regulated and controlled.
The purging structure of the precombustion stage head part 1 provided by the embodiment of the invention is independently designed, can be independently processed, is combined with the same rotational flow blade scheme for testing, and is convenient for adjustment and design
In an alternative embodiment, the prechamber head 1 comprises a support 15, the support 15 being provided in the second air flow path, the support 15 being provided with through holes for the passage of an air flow.
Specifically, in order to ensure the strength of the entire structure, so that the airflow can be continuously blown from the airflow path B into the flame base, as shown in fig. 1 and 2, a support member 15 is provided in the second airflow path, and the support member 15 may be provided in a grid structure, or a large through hole or a plurality of small through holes are provided in the support member 15, and the second airflow path is supported while ensuring the air flow passing property.
In an alternative embodiment, in order to promote the gas in the first air flow passage a to be uniformly mixed with the fuel injected by the pre-combustion stage nozzle 13, a pre-combustion stage swirling piece 14 is further arranged in the pre-combustion stage head part 1; the pre-combustion stage swirl component 14 is arranged between the pre-combustion stage nozzle 13 and the first sleeve 11.
Further, the pre-combustion stage swirl member 14 includes a first connection portion 141 and a second connection portion 142.
The first connection portion 141 is annular, an inner wall surface of the first connection portion 141 is attached to an outer wall surface of the pre-combustion stage nozzle 13, and the second connection portion 142 is connected to the outer wall surface of the first connection portion 141.
The second connection portions 142 are multiple, and the multiple second connection portions 142 are sequentially arranged along the circumferential direction of the first connection portion 141.
In a second aspect, as shown in fig. 4 to 6, an embodiment of the present invention further provides a flame base coupling adjustable central staged combustor, including: a main combustion stage head 2 and a precombustion stage head 1 as described above in relation to the first aspect.
The main stage head 2 comprises: a stage section sleeve 21, a main combustion stage cyclone piece 22 and a third sleeve 23; the secondary section sleeve 21 is sleeved outside the second sleeve 12 of the pre-combustion stage head 1, the third sleeve 23 is sleeved outside the secondary section sleeve 21, a second airflow channel C is formed between the third sleeve 23 and the secondary section sleeve 21, and the main combustion stage swirling piece 22 is arranged in the second airflow channel C.
Specifically, as shown in fig. 4, the main combustion stage head 2 is sleeved outside the second sleeve 12 of the pre-combustion stage head 1, and has a cylindrical overall structure, and the main combustion stage head 2 also has a cylindrical structure.
As shown in fig. 5, the stage section sleeve 21 in the main combustion stage head 2 is sleeved outside the second sleeve 12 of the pre-combustion stage head 1, a main combustion stage swirl component 22 and a third sleeve 23 are sequentially arranged along the radial direction of the main combustion stage head, and a gap is arranged between the third sleeve 23 and the stage section sleeve 21 to form a second airflow channel C as an inflow channel of the gas of the main combustion stage.
As shown in fig. 5 and 6, the air flow path B is located between the first air flow path a and the second air flow path C, and by changing the air volume and the purge angle of the pneumatic purge air, only the coupling relation between the main stage flame root and the precombustion stage flame root can be changed or only the precombustion stage flame root can be changed without changing other pneumatic thermal design parameters.
In addition, the flame root coupling adjustable central staged combustion chamber provided by the embodiment of the invention only needs to replace a part of the pre-combustion stage sleeve, can be manufactured by adopting a 3D printing processing mode, and has lower cost; the assembly is simple, and the welding can be directly carried out.
It should be noted that, because the flame root coupling adjustable central staged combustion chamber includes the precombustion stage head portion 1 shown in the above embodiment, the specific structure of the precombustion stage head portion 1 refers to the above embodiment, and because the flame root coupling adjustable central staged combustion chamber adopts the technical solution of the above embodiment, at least all the beneficial effects brought by the technical solution of the above embodiment are achieved, and no further description is provided herein.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A pre-stage head, comprising: the device comprises 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 air flow channel; the second sleeve is sleeved outside the first sleeve, and a gap is formed between the first sleeve and the second sleeve to form an air flow passage;
the pre-combustion stage nozzle is arranged in the first air flow passage and close to one end of the first sleeve, and the pre-combustion stage nozzle is used for conveying fuel to the other end of the first sleeve along the axial direction 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 bend portion and a second bend portion;
the first horizontal part is arranged on the outer wall side of the first sleeve and is arranged along the axial extension direction of the first sleeve, the first bending part is formed by bending and extending one end of the first horizontal part, and the second bending part is formed by bending and extending one end of the first bending part far away from the first horizontal part.
3. The pre-combustion stage head of claim 2, wherein the second sleeve comprises a second horizontal portion, a third bend, and a fourth bend;
the second horizontal part is arranged on the inner wall side of the second sleeve and is arranged along the axial extension direction of the second sleeve, the third bending part is formed by bending and extending one end of the second horizontal part, and the fourth bending part is formed by bending and extending one end of the third bending part far away from the second horizontal part.
4. The pre-combustion stage head of claim 3, wherein the airflow passage comprises: a first air flow passage, a second air flow passage and a third air flow passage;
the second horizontal part and the first horizontal part are correspondingly arranged to form the first air flow passage, and one end of the first air flow passage is provided with an air inlet; the third bending part and the first bending part are arranged correspondingly to form the second airflow passage; the fourth bending part and the second bending part are correspondingly arranged to form the third airflow channel, and an air outlet is formed in one end, far away from the second airflow channel, of the third airflow channel.
5. The pre-combustion stage head according to claim 4, characterized in that the first outlet divergence angle of the second bend section is 30-120 °.
6. The pre-combustion stage head according to claim 4, characterized in that the second outlet divergence angle of the fourth bend section is 30-120 °.
7. The pre-stage head according to claim 4, comprising a support provided in the second air flow path, the support being provided with a through hole for the passage of an air flow.
8. The pre-combustion stage head of claim 1, further comprising a pre-combustion stage swirl member; the pre-combustion stage rotational flow piece is arranged between the pre-combustion stage nozzle and the first sleeve.
9. The pre-combustion stage head of claim 8, wherein the pre-combustion stage swirl element comprises a first connection portion and a second connection portion;
the first connecting part is annular, the inner wall surface of the first connecting part is attached to the outer wall surface of the pre-combustion stage nozzle, and the second connecting part is connected to the outer wall surface of the first connecting part;
the second connecting parts are arranged in sequence along the circumferential direction of the first connecting part.
10. A flame root coupled adjustable central staged combustor comprising: a main stage head and a pre-stage head as claimed in any one of claims 1 to 9;
the primary combustion stage head includes: the stage section sleeve, the main combustion stage rotational flow piece and the third sleeve; the stage section sleeve is sleeved on the outer side of the second sleeve of the pre-combustion stage head, the third sleeve is sleeved on the outer side of the stage section sleeve, a second airflow channel is formed between the third sleeve and the stage section sleeve, and the main combustion stage rotational flow piece is arranged in the second airflow channel.
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| CN115218218B (en) | 2023-06-16 |
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