CN115218218B - Pre-combustion stage head and flame root coupled adjustable center staged combustion chamber - Google Patents
Pre-combustion stage head and flame root coupled adjustable center staged combustion chamber Download PDFInfo
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- CN115218218B CN115218218B CN202210730274.0A CN202210730274A CN115218218B CN 115218218 B CN115218218 B CN 115218218B CN 202210730274 A CN202210730274 A CN 202210730274A CN 115218218 B CN115218218 B CN 115218218B
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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
Abstract
The invention relates to the technical field of combustion chambers, and provides a precombustion stage head and a flame root coupled adjustable center 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 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 arranged between the first sleeve and the second sleeve so as to construct and form an airflow passage; the precombustion stage nozzle is arranged in the first airflow channel and is close to one end of the first sleeve, and the precombustion 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 head of the precombustion stage regulates and controls the coupling relation between the main combustion stage flame and the root of the precombustion stage flame through the design of the independent purge gas, so that the stability of the flame is ensured, the emission of nitrogen oxides is reduced, and the requirement of low emission is met.
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 center staged combustion chamber.
Background
With the rapid development of the aviation and industrial gas turbine industry, the problem of environmental pollution is also accompanied, and for this reason, the international civil aviation organization puts forward the restriction law on the emission standard of the aircraft pollutants, and continuously improves the emission standard, especially the emission of nitrogen and oxygen gas, and the combustion chamber of the aircraft engine is the source of the power of the aircraft and is also the main source of the pollutant emission. Therefore, high demands are placed on the design of the combustion chamber. Low emission combustion technology is one of the focus of current research.
The central staged combustor is one of the common low emission combustor structures at present, and the central staged combustors are arranged in radial stages along the central axial direction: the outer ring is a main combustion stage, most of air enters the burner through the main combustion stage, and enters the combustion chamber for combustion after being mixed with fuel oil injected into the channel to a certain extent in advance, so that lean oil premixed combustion is realized, and the output of emissions finally generated by combustion can be ensured to reach a lower level; the central inner ring is a precombustion stage, and a small part of air enters the burner through the precombustion stage and directly enters the combustion chamber with fuel oil sprayed out of the downstream central body nozzle for combustion, so that the characteristics of rich oil diffusion combustion are presented, and the stability and the flameout performance of the overall flame are ensured.
In the existing design of the central staged combustion chamber, the aerodynamic design parameters of the main combustion stage and the precombustion stage are required to be fixed, so that the root coupling relation of the flame of the main combustion stage and the precombustion stage is difficult to change, the root coupling relation of the flame of the main combustion stage and the precombustion stage can influence the emission and stability of combustion, in the prior art, the aerodynamic design parameters of the main combustion stage and the precombustion stage are directly changed, the mode can change the root coupling relation of the flame to a certain extent, but other aerodynamic structure changes are brought, the control of a single variable is not facilitated, and the final combustion performance changing effect is deviated from expectations.
Disclosure of Invention
The invention provides a precombustion stage head and flame root coupling adjustable center staged combustion chamber, which is used for solving the defects of poor emission performance and flame stabilizing performance caused by poor coupling free regulation performance of a main flame root and a precombustion stage flame root coupling adjustable center staged combustion chamber in the prior art.
In a first aspect, the present invention provides a precombustion stage head comprising: the first sleeve, the second sleeve and the precombustion 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 arranged between the first sleeve and the second sleeve so as to construct and form an airflow passage;
the pre-combustion stage nozzle is arranged in the first airflow channel and is 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.
According to the pre-combustion-stage head provided by the invention, the first sleeve comprises a first horizontal part, a first bending part and a second bending part;
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 away from the first horizontal part.
According to the pre-combustion-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 away from the second horizontal part.
According to the present invention there is provided a precombustion stage head, the airflow path comprising: a first airflow passage, a second airflow passage, and a third airflow passage;
the second horizontal part is arranged corresponding to the first horizontal part to form the first airflow passage, and one end of the first airflow passage is provided with an air inlet; the third bending part is arranged corresponding to the first bending part so as to form the second airflow passage; the fourth bending part and the second bending part are correspondingly arranged to form the third airflow passage, and an air outlet is arranged at one end of the third airflow passage far away from the second airflow passage.
According to the pre-combustion stage head provided by the invention, the first outlet expansion angle of the second bending section is 30-120 degrees.
According to the pre-combustion stage head provided by the invention, the second outlet expansion angle of the fourth bending section is 30-120 degrees.
According to the pre-combustion stage head provided by the invention, the pre-combustion stage head comprises the support piece, the support piece is arranged in the second airflow passage, and the support piece is provided with the through hole for the airflow to pass through.
According to the pre-combustion stage head provided by the invention, the pre-combustion stage head further comprises a pre-combustion stage cyclone; the precombustion stage swirl member is arranged between the precombustion stage nozzle and the first sleeve.
According to the pre-combustion stage head provided by the invention, the pre-combustion stage cyclone 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 precombustion stage nozzle, and the second connecting part is connected to the outer wall surface of the first connecting part;
the second connecting portions are arranged in sequence along the circumferential direction of the first connecting portion.
In a second aspect, the present invention also provides a flame root coupled adjustable center staged combustion chamber, comprising: a main combustion stage head as claimed in any one of the first aspects;
the main combustion stage head comprises: an interstage sleeve, a main combustion stage cyclone and a third sleeve; the inter-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 inter-stage section sleeve, a second airflow channel is formed between the third sleeve and the inter-stage section sleeve, and the main combustion stage cyclone is arranged in the second airflow channel.
According to the pre-combustion stage head provided by the invention, the first airflow channel is formed by surrounding the inner wall surface of the first sleeve, the pre-combustion stage nozzle is arranged in the first airflow channel, fuel oil is sprayed to the first air incoming flow through the pre-combustion stage nozzle, further, the pre-combustion stage flame is coupled with the root of the main combustion stage flame, an airflow passage is formed by sleeving the first sleeve and the second sleeve, and the root of the pre-combustion stage flame can be blown through the airflow passage, so that the coupling relation between the main combustion stage flame and the root of the pre-combustion stage flame can be regulated, the stability of the flame is ensured, the emission of nitrogen oxides is reduced, and the low emission requirement is met. Therefore, the precombustion stage head provided by the invention can effectively ensure the stability of flame, improve the low emission performance, and has the advantages of simple structure, convenience in assembly and low processing cost.
Furthermore, the flame root coupled adjustable center staged combustion chamber provided by the invention has the same advantages as the pre-stage head.
In addition to the technical problems, features of the constituent technical solutions and advantages brought by the technical features of the technical solutions described above, other technical features of the present invention and advantages brought by the technical features of the technical solutions will be further described with reference to the accompanying drawings or will be understood through practice of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of a precombustion stage head according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a cross-sectional structure of a precombustion stage head according to an embodiment of the present invention;
FIG. 3 is a schematic view of a portion of a precombustion stage head according to an embodiment of the present invention;
FIG. 4 is a schematic view of a flame root coupled adjustable center staged combustion chamber in accordance with an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a flame root coupled adjustable center staged combustor according to an embodiment of the present invention;
FIG. 6 is a second schematic view of a flame root coupled adjustable center staged combustion chamber in accordance with an embodiment of the present invention;
reference numerals:
1: a precombustion stage head; 11: a first sleeve; 111: a first horizontal portion; 112: a first bending part; 113: a second bending part; 12: a second sleeve; 121: a second horizontal portion; 122: a third bending part; 123: a fourth bending part; 13: a precombustion stage nozzle; 14: a pre-combustion stage swirl element; 141: a first connection portion; 142: a second connecting portion; 15: a support;
2: a main combustion stage head 2;21: an interstage section sleeve; 22: a primary combustion stage swirl element; 23: a third sleeve;
a: a first airflow passage; b: an air flow path; c: a second airflow passage; i: an air inlet; II: an air outlet; a: a first outlet divergence angle; b: a second outlet divergence angle.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of 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 "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific 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 describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Furthermore, in the description of the embodiments of the present invention, unless otherwise indicated, the meaning of "a plurality of", "a plurality of" means two or more, and the meaning of "a plurality of", "a plurality of" means one or more ".
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., 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, 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The precombustion stage head 1 and the flame root coupled adjustable center 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 prechamber head 1 according to an embodiment of the invention comprises: a first sleeve 11, a second sleeve 12 and a pre-combustion nozzle 13.
The inner wall surface of the first sleeve 11 is enclosed to form a first air flow channel A; the second sleeve 12 is sleeved outside the first sleeve 11, and a gap is arranged between the first sleeve 11 and the second sleeve 12 to form an airflow passage B.
The pre-combustion nozzle 13 is disposed in the first air flow channel a and near one end of the first sleeve 11, and the pre-combustion 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 overall configuration of the precombustion stage head 1 is cylindrical, that is, the first sleeve 11 and the second sleeve 12 thereof are both annular structures.
As shown in fig. 1, the precombustion stage nozzle 13 is disposed at the innermost layer of the precombustion stage head 1, and the first sleeve 11 and the second sleeve 12 are sequentially sleeved on the outer side of the precombustion stage nozzle 13 along the radial extending direction.
The axial extension lengths of the first sleeve 11 and the second sleeve 12 are substantially the same, the axial extension length of the pre-combustion nozzle 13 is smaller than the lengths of the first sleeve 11 and the second sleeve 12, as shown in fig. 1, an inner cavity formed by an inner wall surface of the first sleeve 11 is a first air flow channel a, and the pre-combustion nozzle 13 is disposed on the left side of the first air flow channel a.
A gap is formed between the first sleeve 11 and the second sleeve 12, and the gap is an air flow passage B for allowing air flow to enter the combustion chamber and controlling the coupling condition of the root parts of the main combustion flame and the precombustion flame, and air is blown through the air flow passage B, so that the air flow can be between the main combustion flame and the precombustion flame, and the coupling relationship between the root parts of the main combustion flame and the precombustion flame can be regulated.
According to the pre-combustion stage head 1 provided by the embodiment of the invention, the inner wall surface of the first sleeve 11 is surrounded to form the first air flow channel A, the pre-combustion stage nozzle 13 is arranged in the first air flow channel A, fuel is sprayed to the first air flow channel through the pre-combustion stage nozzle 13, and is circulated to the injected air inflow, further, the pre-combustion 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 channel B, and the root of the pre-combustion stage flame can be blown through the air flow channel B, so that the coupling relation between the main combustion stage flame and the root of the pre-combustion stage flame can be regulated, the stability of the flame is ensured, the emission of nitrogen oxides is reduced, and the low emission requirement is met. Therefore, the precombustion stage head 1 provided by the invention can effectively ensure the stability of flame, improve 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 bending portion 112, and a second bending 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 extending 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, and the second bending portion 113 is 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 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, where the first horizontal portion 111 extends along the axial extending direction of the first sleeve 11, the first bending portion 112 is formed by bending and extending at an end point of the first horizontal portion 111 toward the axial direction of the first sleeve 11, and a closing angle of the first bending portion 112 is not specifically limited, and the first bending portion 112 may be bent according to actual needs, so that gas circulation can be achieved.
A second bending portion 113 is formed at an end portion of the first bending portion 112 extending in an outward expanding manner away from the axial direction of the first sleeve 11, whereby a right end portion of the first sleeve 11 is formed in a flared shape 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 side 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 bending portion 122, and a fourth bending 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 is disposed to extend along the axial extending direction of the second sleeve 12, and the length of the second horizontal portion 121 may be identical to 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 required, and the specific length is not limited, and a gap may be formed between the second horizontal portion 121 and the first horizontal portion 111, so that gas may circulate.
The third bending portion 122 is formed by bending and extending the end point of the second horizontal portion 121 toward the axial direction of the first sleeve 11, and the closing angle of the third bending portion 122 is not particularly limited, and 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, and the specific arrangement mode is set according to actual needs, so that a gap is formed between the third bending portion 122 and the first bending portion 112, and the air can circulate.
A fourth bending portion 123 is formed at the end of the third bending portion 122 in a manner of being extended and bent outwards in the axial direction away from the first sleeve 11, and as described above, the fourth bending portion 123 may be disposed parallel to the third bending portion 122 or may not be parallel to the third bending portion as shown in fig. 2, so that the right end of the second sleeve 12 is also flared as shown in fig. 2.
Further, the airflow path B includes: the first air flow passage, the second air flow passage and the 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, and as shown in fig. 2, one end of the first air flow path is provided with an air inlet I, which may be an entire annular through hole penetrating 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, and the number and size of the air inlets I are not particularly limited, and in actual operation, the amount of air blown may be changed by changing the number and aperture of the air inlets I. The number of the air inlets I is preferably 10 to 50, the aperture is preferably 0.5 to 3mm, and other numbers and apertures are also possible.
The third bending portion 122 is disposed corresponding to the first bending portion 112 to form a second airflow path, and the airflow enters the second airflow path through the first airflow path.
The fourth bending portion 123 is disposed corresponding to the second bending portion 113 to form a third airflow path, one end of the third airflow path away from the second airflow path is provided with an air outlet II, and the airflow passing through the second airflow path can be ejected through the third airflow path and the air outlet II in sequence.
In an alternative embodiment, the first exit flare angle a of the second bend is 30-120 °.
The second outlet expansion angle b of the fourth bending section is 30-120 degrees.
Specifically, as shown in fig. 2, the end of the second bending section is a first outlet expansion angle a, and the end of the fourth bending section is a 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 degrees, and the root coupling position of the precombustion stage flame can be independently changed.
By changing the angle of the second outlet expansion angle b of the fourth bending section, the angle parameter range is 30-120 degrees, and the root coupling position of the main combustion stage flame can be independently changed.
Meanwhile, the angle of the first outlet expansion angle a of the second bending section and the angle of 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, and the root coupling relation of the main combustion stage flame and the precombustion stage flame can be changed, so that the flame of the combustion chamber is regulated and controlled.
The purging structure of the precombustion stage head 1 provided by the embodiment of the invention is independently designed, can be independently processed, and is convenient to adjust and design by combining the same swirl vane scheme for test
In an alternative embodiment, the pre-combustion stage 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 air flow to pass through.
Specifically, in order to secure the strength of the overall structure so that the air flow can be continuously blown into the flame root from the air flow path B, as shown in fig. 1 and 2, a support member 15 is provided in the second air flow path, and the support member 15 may be provided in a grill structure, or a large through hole or a plurality of small through holes are provided in the support member 15, and while supporting the second air flow path, the passability of the air flow is secured.
In an alternative embodiment, in order to promote uniform mixing of the gas in the first air flow channel a and the fuel injected by the pre-combustion stage nozzle 13, a pre-combustion stage cyclone 14 is further arranged in the pre-combustion stage head 1; the pre-stage swirl member 14 is provided between the pre-stage nozzle 13 and the first sleeve 11.
Further, the pre-combustion stage swirl element 14 comprises a first connection 141 and a second connection 142.
The first connecting portion 141 is annular, an inner wall surface of the first connecting portion 141 is fitted to an outer wall surface of the pre-combustion nozzle 13, and the second connecting portion 142 is connected to the outer wall surface of the first connecting portion 141.
The plurality of second connecting portions 142 are sequentially arranged along the circumferential direction of the first connecting portion 141.
In a second aspect, as shown in fig. 4 to 6, an embodiment of the present invention further provides a flame root coupled adjustable center staged combustion chamber, including: the main combustion stage head 2 and the pre-combustion stage head 1 according to the first aspect described above.
The main combustion stage head 2 comprises: an inter-stage sleeve 21, a main combustion stage swirl element 22 and a third sleeve 23; the inter-stage sleeve 21 is sleeved outside the second sleeve 12 of the pre-combustion stage head 1, the third sleeve 23 is sleeved outside the inter-stage sleeve 21, a second airflow channel C is formed between the third sleeve 23 and the inter-stage sleeve 21, and the main combustion stage swirl element 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, the overall structure is cylindrical, and the main combustion stage head 2 also has a cylindrical structure.
As shown in fig. 5, the inter-stage 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 cyclone 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 inter-stage sleeve 21 so as to form a second airflow channel C as a gas inflow channel of the main combustion stage.
As shown in fig. 5 and 6, the air flow passage B is located between the first air flow passage a and the second air flow passage C, and can change only the coupling relationship between the main root portion and the pre-combustion stage root portion or only the pre-combustion stage flame root portion by changing the amount and the purge angle of the air purge gas without changing other aerodynamic design parameters.
In addition, the flame root coupling adjustable center staged combustion chamber provided by the embodiment of the invention only needs to replace a part of the precombustion stage sleeve, can be manufactured in a 3D printing processing mode, and has low cost; the assembly is simple, and the welding is directly carried out.
It should be noted that, since the flame root coupling adjustable center staged combustion chamber includes the precombustion stage head 1 shown in the above embodiment, the specific structure of the precombustion stage head 1 refers to the above embodiment, and since the flame root coupling adjustable center staged combustion chamber adopts the technical solution of the above embodiment, the flame root coupling adjustable center staged combustion chamber at least has all the beneficial effects brought by the technical solution of the above embodiment, and will not be described in detail herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A precombustion stage head, comprising: the first sleeve, the second sleeve and the precombustion 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 arranged between the first sleeve and the second sleeve so as to construct and form an airflow passage;
the pre-combustion stage nozzle is arranged in the first airflow channel and is 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 first sleeve comprises a first horizontal part, a first bending part and a second bending part; 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 from one end of the first horizontal part, and the second bending part is formed by bending and extending from one end of the first bending part away from the first horizontal part;
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 from one end of the second horizontal part, and the fourth bending part is formed by bending and extending from one end of the third bending part far away from the second horizontal part;
the airflow path includes: a first airflow passage, a second airflow passage, and a third airflow passage; the second horizontal part is arranged corresponding to the first horizontal part to form the first airflow passage, and one end of the first airflow passage is provided with an air inlet; the third bending part is arranged corresponding to the first bending part so as to form the second airflow passage; the fourth bending part and the second bending part are correspondingly arranged to form the third airflow passage, and an air outlet is arranged at one end of the third airflow passage far away from the second airflow passage.
2. The precombustion stage head of claim 1, wherein the first outlet divergence angle of the second bend is 30-120 °.
3. The precombustion stage head of claim 1, wherein the second outlet divergence angle of the fourth bend is 30-120 °.
4. The pre-combustion stage head according to claim 1, characterized in that the pre-combustion stage head comprises a support provided in the second air flow path, the support being provided with through holes for the air flow to pass through.
5. The pre-stage head according to claim 1, further comprising a pre-stage swirl element; the precombustion stage swirl member is arranged between the precombustion stage nozzle and the first sleeve.
6. The pre-combustion stage head according to claim 5, 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 precombustion stage nozzle, and the second connecting part is connected to the outer wall surface of the first connecting part;
the second connecting portions are arranged in sequence along the circumferential direction of the first connecting portion.
7. A flame root coupled adjustable center staged combustor comprising: a main combustion stage head as claimed in any one of claims 1 to 6;
the main combustion stage head comprises: an interstage sleeve, a main combustion stage cyclone and a third sleeve; the inter-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 inter-stage section sleeve, a second airflow channel is formed between the third sleeve and the inter-stage section sleeve, and the main combustion stage cyclone is arranged in the second airflow channel.
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| CN115218218A (en) | 2022-10-21 |
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