CN115307178B - Low emission combustor head scheme with interstage stage enhanced cooling - Google Patents
Low emission combustor head scheme with interstage stage enhanced cooling Download PDFInfo
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- CN115307178B CN115307178B CN202210887828.8A CN202210887828A CN115307178B CN 115307178 B CN115307178 B CN 115307178B CN 202210887828 A CN202210887828 A CN 202210887828A CN 115307178 B CN115307178 B CN 115307178B
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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
Abstract
The present invention provides a low-emission combustor head scheme with interstage stage enhanced cooling, comprising: the precombustion stage is arranged at the inner wall surface of the interstage section, and the main combustion stage is arranged at the outer wall surface of the interstage section; the interstage section comprises an inner sleeve and an outer sleeve, and an air inlet cavity is formed by enclosing the inner sleeve and the outer sleeve; the outlet end of the inner sleeve is provided with a guide part and an annular boss which are arranged at intervals along the axial direction of the inner sleeve, the inner sleeve is connected with the outer sleeve through the guide part, and the guide part is provided with a gas guiding hole; the annular boss is provided with a first cooling structure; and/or an impact part is constructed between the guide part and the annular boss, a gas collecting cavity is formed by enclosing the impact part and the guide part, and the impact part is provided with a second cooling structure; the cooling gas in the air inlet cavity can penetrate through the air guide holes, and the interstage section is cooled through the first cooling structure and/or the second cooling structure, so that the cooling effect of the interstage section is enhanced, and the phenomenon of ablation damage of the interstage section is effectively avoided.
Description
Technical Field
The invention relates to the technical field of combustion chambers, in particular to a low-emission combustion chamber head scheme with interstage stage enhanced cooling.
Background
Gas turbines are the main power units of various equipment such as power generation, aviation, ship power and the like, and gas turbine combustors are one of three major components of gas turbines, wherein the emission level of the gas turbine is completely dependent on the gas turbine combustors.
Lean premixed combustion is currently the dominant low emission combustion technology for engines based on environmental considerations in order to reduce emissions of pollutants based on nitrogen oxides. In the prior art, lean oil premixed combustion chambers mostly adopt a central hierarchical structure, namely a central precombustion stage is adopted, an outer ring is adopted as a main combustion stage, the precombustion stage adopts a diffusion combustion mode, and the main combustion stage adopts a premixed combustion mode. The center hierarchical structure has the segmentation step between the precombustion stage and the main combustion stage, and the interaction between the main combustion stage flame and the precombustion stage flame can be well controlled by the interstage section, so that the macroscopic performance of the combustion chamber is influenced.
The inter-stage section is positioned between the main pre-combustion stage flames, the main pre-combustion stage flames have strong heating effect on the inter-stage section, the inter-stage section of the traditional combustion chamber is cooled in a back weak impact cooling mode, and the inter-stage cooling gas is led to impact convection heat exchange of the inter-stage section through the small through holes so as to reduce the temperature of the inter-stage section step. However, the cooling gas channel of the stage step of the traditional gas turbine combustor is smooth, the cooling gas is completely relied on to flow and exchange heat, the heat exchange efficiency is low, the cooling efficiency of limited gas is low under the condition of larger working conditions, the cooling effect is poor, the stage step of the stage is easy to generate ablation damage, and the service life of the combustor is influenced.
Disclosure of Invention
The invention provides a low-emission combustion chamber head scheme with interstage stage intensified cooling, which is used for solving the problems of poor cooling effect and poor heat protection performance of the interstage stage existing in the existing combustion chamber head.
The present invention provides a low-emission combustor head scheme with interstage stage enhanced cooling, comprising: a precombustion stage, an interstage stage and a main combustion stage;
the pre-combustion stage is arranged at the inner wall surface of the interstage section, and the main combustion stage is arranged at the outer wall surface of the interstage section; the interstage section comprises an inner sleeve and an outer sleeve, and an air inlet cavity is formed by enclosing the inner sleeve and the outer sleeve; the guide part and the annular boss are arranged at the outlet end of the inner sleeve at intervals along the axial direction of the inner sleeve, the inner sleeve is connected with the outer sleeve through the guide part, and the guide part is provided with a gas guiding hole;
the annular boss is provided with a first cooling structure; and/or an impact part is constructed between the guide part and the annular boss, an air collecting cavity is formed by enclosing the impact part and the guide part, and the impact part is provided with a second cooling structure;
the cooling gas in the gas inlet chamber can penetrate through the gas bleed holes and cool the interstage section through the first cooling structure and/or the second cooling structure.
According to the low-emission combustion chamber head scheme with interstage section enhanced cooling provided by the invention, the first cooling structure comprises a plurality of divergent holes penetrating through two opposite end surfaces of the annular boss, and the divergent holes are arranged on the annular boss at intervals.
According to the low-emission combustion chamber head scheme with interstage stage intensified cooling provided by the invention, a plurality of the annular arrays of the divergent holes are arranged on the annular boss, the axial direction of the divergent holes and the radial direction of the annular boss form a first angle, and the range of the first angle is 0-90 degrees.
According to the low-emission combustion chamber head scheme with interstage stage intensified cooling provided by the invention, the axial direction of the divergent hole forms a second angle with the circumferential direction of the annular boss, and the second angle ranges from 0 degrees to 90 degrees.
According to the low-emission combustion chamber head scheme with interstage section intensified cooling provided by the invention, a plurality of divergent holes form a plurality of groups of divergent hole units, at least one group of divergent hole units are arranged on the annular boss along a first rotation direction, at least one group of divergent hole units are arranged on the annular boss along a second rotation direction, and the first rotation direction is opposite to the second rotation direction.
According to the low-emission combustion chamber head scheme with interstage stage intensified cooling provided by the invention, the divergent holes in two adjacent groups of divergent hole units are arranged in a staggered manner.
According to the present invention, there is provided a low emission combustor head scheme with interstage stage enhanced cooling, the diverging holes having diameters of 0.1-1 mm.
According to the low-emission combustion chamber head scheme with the interstage section enhanced cooling, the second cooling structure comprises a plurality of impact holes, the impact holes are annularly arranged on the impact part, and cooling gas in the gas inlet chamber can sequentially penetrate through the gas introducing holes and the impact holes.
According to the low-emission combustion chamber head scheme with the interstage section enhanced cooling, a plurality of impact holes form a plurality of groups of impact hole units, and the impact holes in two adjacent groups of impact hole units are arranged in a staggered mode.
According to the low-emission combustor head scheme with interstage stage enhanced cooling provided by the invention, the diameter of the impact hole is 0.1-1 mm.
The invention provides a low-emission combustion chamber head scheme with reinforced cooling of an interstage section, the interstage section comprises an inner sleeve and an outer sleeve which are coaxially arranged, a guide part and an annular boss are constructed on the outer wall surface of the outlet end of the inner sleeve, a first cooling structure is arranged on the annular boss, or an impact part is arranged between the guide part and the annular boss, a second cooling structure is arranged on the impact part, and the first cooling structure or the second cooling structure can enhance the heat convection intensity of cooling gas and the annular boss, thereby being beneficial to enhancing the cooling effect of the interstage section, effectively avoiding the ablation damage phenomenon of the interstage section and prolonging the service life of a combustion chamber.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural view of a low-emission combustor head scheme with interstage stage enhanced cooling provided by the present invention;
FIG. 2 is a schematic illustration of one of the configurations of the interstage sections provided by the present invention;
FIG. 3 is a schematic cross-sectional view taken along the direction A in FIG. 2;
FIG. 4 is one of the schematic cross-sectional views B in FIG. 2;
FIG. 5 is a second cross-sectional view of the B-direction of FIG. 2;
FIG. 6 is a third schematic view in section B in FIG. 2;
FIG. 7 is a second schematic view of an interstage section according to the present invention;
FIG. 8 is a schematic view in section A in FIG. 7;
FIG. 9 is a schematic cross-sectional view taken along the B-direction in FIG. 7;
FIG. 10 is a third schematic illustration of the construction of the interstage section provided by the present invention;
FIG. 11 is a schematic sectional view in section A of FIG. 10;
FIG. 12 is a schematic view in section B in FIG. 10;
reference numerals: 1: a precombustion stage; 2: a main combustion stage; 3: an interstage section; 31: an inner sleeve; 311: a guide section; 3111: an air vent; 312: an annular boss; 3121: a divergent aperture; 313: an impact section; 3131: an impingement hole; 32: an outer sleeve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
A low-emission combustor head scheme with interstage stage enhanced cooling in accordance with an embodiment of the invention is described below in conjunction with fig. 1-12.
As shown in fig. 1, the low-emission combustor head scheme with interstage stage enhanced cooling provided by an embodiment of the invention includes: pre-combustion stage 1, inter-stage section 3 and main combustion stage 2.
The precombustion stage 1 is arranged at the inner wall surface of the interstage section 3, and the main combustion stage 2 is arranged at the outer wall surface of the interstage section 3; the interstage section 3 comprises an inner sleeve 31 and an outer sleeve 32, and an air inlet cavity is formed by enclosing the inner sleeve 31 and the outer sleeve 32; the outlet end of the inner sleeve 31 is provided with a guide portion 311 and an annular boss 312, the guide portion 311 and the annular boss 312 are arranged at intervals along the axial direction of the inner sleeve 31, the inner sleeve 31 is connected with the outer sleeve 32 through the guide portion 311, and the guide portion 311 is provided with a gas guiding hole.
The annular boss 312 is provided with a first cooling structure; and/or an impact part 313 is constructed between the guide part 311 and the annular boss 312, the impact part 313 and the guide part 311 are enclosed to form a gas collection chamber, and the impact part 313 is provided with a second cooling structure; the cooling gas in the gas inlet chamber can be led through the gas lead-through holes and cool the interstage section 3 by means of the first cooling structure and/or the second cooling structure.
Specifically, the pre-combustion stage 1 comprises a central body, a pre-combustion stage inner cyclone and a pre-combustion stage outer cyclone, and the main combustion stage 2 comprises a main combustion stage cyclone and a main combustion stage outer ring. The central body is positioned at the central axis of the head of the combustion chamber, the precombustion stage inner swirler is sleeved on the periphery of the central body, the precombustion stage outer swirler is sleeved on the periphery of the precombustion stage inner swirler, and a precombustion stage nozzle is arranged at the central body.
The interstage section 3 has a cylindrical structure, the pre-combustion stage external cyclone is arranged at the inner wall surface of the inlet end of the interstage section 3, and the main combustion stage cyclone is arranged at the outer wall surface of the inlet end of the interstage section 3. Under the action of the pre-combustion inner swirler and the pre-combustion outer swirler, the pre-combustion oil mist is sprayed into the flame tube through the central body to form pre-combustion flame. Under the action of the main combustion stage cyclone, the main combustion stage oil mist is sprayed into the flame tube by the main combustion stage oil circuit to form main combustion stage flame.
The interstage section 3 comprises an inner sleeve 31 and an outer sleeve 32, the inner sleeve 31 and the outer sleeve 32 are coaxially arranged, a guide part 311 and an annular boss 312 are formed at the outer wall surface of the outlet end of the inner sleeve 31, the guide part 311 is used for connecting the inner sleeve 31 and the outer sleeve 32, and the guide part 311 can be connected with the outer sleeve 32 in a threaded mode. The distance between the outer wall surface of the inner sleeve 31 and the inner wall surface of the outer sleeve 32 is set according to actual requirements, and the outer wall surface of the inner sleeve 31, the guide portion 311 and the inner wall surface of the outer sleeve 32 enclose to form an air inlet chamber for cooling air. The guide portion 311 is provided with bleed holes, which are circumferentially arranged around the axis of the inner tube 31 in the guide portion 311, and which penetrate through both surfaces of the guide portion 311 opposite to each other. The shape of the air vent can be round hole, ellipse, square, arc or polygon, and the shape of the air vent can also be a combination of various shapes.
In the prior art, most of the cooling gas passes through the bleed air holes through the bleed air Kong Yinqi and enters the circulation gap between the guide part 311 and the annular boss 312 to cool the annular boss 312, so that the heat exchange efficiency between the cooling gas and the annular boss 312 is low, the temperature of the annular boss 312 area at the outlet end of the interstage section 3 cannot be effectively controlled, and the interstage section 3 is easy to be ablated and damaged.
In the invention, the annular boss 312 is provided with a first cooling structure, the cooling gas in the air inlet cavity passes through the plurality of air guide holes and flows to the first cooling structure, the first cooling structure can be a plurality of diffusion holes, the cooling gas can perform sufficient convection heat exchange with the annular boss 312 through the first cooling structure, and the flow of the cooling gas can cool the arc-shaped boss and the nearby area, so that the cooling effect is enhanced, and the phenomenon of ablation damage of the interstage section 3 is effectively avoided.
Or the impact part 313 is configured between the guide part 311 and the annular boss 312, and the impact part 313 is connected with the guide part 311 through the connecting part, so that the impact part 313, the connecting part and the guide part 311 enclose to form a gas collecting chamber. The impact portion 313 is provided with a second cooling structure, which may be a plurality of impact holes, which are provided on the impact portion 313. After flowing through the air-guiding hole, the cooling gas in the air inlet cavity flows into the air collecting cavity, further passes through the impact holes and flows to the annular boss 312, the impact holes enlarge the flowing range of the cooling gas, the fluidity of the cooling gas is enhanced, the contact area between the cooling gas and the annular boss 312 is increased, and therefore the heat dissipation efficiency of the annular boss 312 area is improved.
Or the annular boss 312 is provided with a first cooling structure, meanwhile, an impact part 313 is constructed between the guide part 311 and the annular boss 312, the impact part 313 is provided with a second cooling structure, after cooling gas in the air inlet cavity flows through the air guide holes, the cooling gas can sequentially flow through the second cooling structure on the impact part 313 and the first cooling structure on the annular boss 312, and the cooling gas can fully perform full convection heat exchange with the annular boss 312 and a nearby area.
In the embodiment of the invention, the inter-stage section 3 comprises an inner sleeve 31 and an outer sleeve 32 which are coaxially arranged, a guide part 311 and an annular boss 312 are constructed on the outer wall surface of the outlet end of the inner sleeve 31, a first cooling structure is arranged on the annular boss 312, or an impact part 313 is arranged between the guide part 311 and the annular boss 312, and a second cooling structure is arranged on the impact part 313, so that the first cooling structure or the second cooling structure can enhance the convective heat exchange strength of cooling gas and the annular boss 312, thereby being beneficial to enhancing the cooling effect of the inter-stage section 3, effectively avoiding the ablation damage phenomenon of the inter-stage section 3 and prolonging the service life of a combustion chamber.
In an alternative embodiment, as shown in fig. 2, 3 and 4, the first cooling structure includes a plurality of diverging holes 3121, the diverging holes 3121 extending through opposite end surfaces of the annular boss 312, the plurality of diverging holes 3121 being spaced apart from the annular boss 312.
Specifically, a circulation gap is formed between the guide portion 311 and the annular boss 312, the guide portion 311 is provided with a plurality of bleed holes 3111, the first cooling structure includes a plurality of divergent holes 3121, and the divergent holes 3121 penetrate opposite end surfaces of the annular boss 312. The end surface of the annular boss 312 facing the guiding portion 311 is defined as a first end surface of the annular boss 312, the end surface of the annular boss 312 facing away from the guiding portion 311 is defined as a second end surface of the annular boss 312, a plurality of divergent holes 3121 are arranged on the annular boss 312 at intervals, and the size and the number of the divergent holes 3121 are set according to actual requirements. For example, the diameter of the diverging holes 3121 is 0.1 to 1 mm, and the number of the diverging holes 3121 is 10 to 1000.
After flowing through the plurality of air-introducing holes 3111, the cooling air in the air-introducing chamber enters the flow gap region between the guide portion 311 and the annular boss 312, and exchanges heat with the annular boss 312. The annular boss 312 is provided with a plurality of diffusion holes 3121, and the plurality of diffusion holes 3121 increases the contact area between the cooling gas and the annular boss 312, which is beneficial to enhancing the convective heat exchange strength; at the same time, after the cooling gas exchanges heat with the annular boss 312 in a convection manner, the cooling gas can be further led out from the divergence holes 3121 to the combustion zone to participate in combustion. The flow of the cooling gas in the flow gap region and the plurality of diverging holes 3121 region can effectively enhance the cooling of the annular boss 312.
In the embodiment of the present invention, the diverging holes 3121 penetrate through two opposite end surfaces of the annular boss 312, the plurality of diverging holes 3121 are disposed on the annular boss 312 at intervals, the cooling gas flows through the gas introducing holes 3111 into the circulation gap region, the cooling gas further flows to the plurality of diverging holes 3121, and the plurality of diverging holes 3121 can effectively enhance the convective heat exchange strength between the cooling gas and the annular boss 312, thereby enhancing the cooling effect on the interstage section 3.
As shown in fig. 2 and 4, in an alternative embodiment, a plurality of the diverging holes 3121 are annularly arranged in the annular boss 312, and the axial direction of the diverging holes 3121 forms a first angle with the radial direction of the annular boss 312, the first angle being in the range of 0-90 degrees.
Specifically, the plurality of divergent holes 3121 are annularly arranged on the annular boss 312 around the axis of the inner sleeve 31, and the plurality of divergent holes 3121 form a plurality of groups of divergent hole units, one group being one turn, the number of groups of divergent hole units being not particularly limited, for example, the number of groups of divergent hole units being one group, two groups or more groups, etc. Further, the divergent holes 3121 in the adjacent two sets of divergent hole units are arranged offset in the circumferential direction.
The diverging holes 3121 are disposed obliquely with respect to the axial direction of the inner sleeve 31, the diverging holes 3121 have a first end facing the guide 311 and a second end facing away from the guide 311, the first end of the diverging holes 3121 being close to the axis of the inner sleeve 31, the second end of the diverging holes 3121 being distant from the axis of the inner sleeve 31. The axial direction of the diverging hole 3121 forms a first angle with the radial direction of the annular boss 312, which is in the range of 0-90 degrees, when the first angle is 90 degrees, i.e. the axis of the diverging hole 3121 is parallel to the axis of the inner sleeve 31. The first angle can be set to be 30 degrees, 45 degrees or 60 degrees according to actual requirements, and the first angle is preferably 20-60 degrees.
The divergent hole 3121 is inclined with respect to the axial direction of the inner sleeve 31, and increases the contact area between the cooling gas and the annular boss 312 under the condition that the aperture of the divergent hole 3121 is fixed, thereby being beneficial to enhancing the heat convection intensity of the cooling gas and the annular boss 312 and accelerating the heat dissipation of the annular boss 312.
In the embodiment of the present invention, the plurality of the diverging holes 3121 are annularly arranged on the annular boss 312, and the angle between the axial direction of the diverging holes 3121 and the radial direction of the annular boss 312 is greater than 0 degrees and less than 90 degrees, which is beneficial to increasing the contact area between the cooling gas and the annular boss 312 and enhancing the convective heat exchange strength between the cooling gas and the annular boss 312.
In an alternative embodiment, the axial direction of the diverging aperture 3121 forms a second angle with the circumferential direction of the annular boss 312, the second angle ranging from 0 to 90 degrees.
Specifically, the diverging hole 3121 is disposed obliquely with respect to the circumferential direction of the annular boss 312, and a second angle is formed between the axial direction of the diverging hole 3121 and the circumferential direction of the annular boss 312, the second angle ranges from 0 to 90 degrees, and the second angle may be set to 30 degrees, 45 degrees, 60 degrees, or the like, according to actual requirements, and the second angle is preferably 20 to 60 degrees.
As shown in fig. 5, the axial direction of the diverging hole 3121 is inclined with respect to the circumferential direction of the annular boss 312, so that a cooling air flow in a certain swirling state can be generated during the cooling air flowing through the diverging hole 3121, which is beneficial to further enhancing the heat convection intensity of the cooling air and the annular boss 312 and accelerating the heat dissipation of the annular boss 312.
The plurality of diverging holes 3121 are arranged in an annular array to form a plurality of sets of diverging hole units, and the rotational direction of the diverging holes 3121 relative to the annular boss 312 is set according to actual requirements. For example, the number of the groups of the diverging hole units is two, and the rotation directions of the diverging holes 3121 in the two groups of the diverging hole units are clockwise; or the rotation directions of the divergence holes 3121 in both sets of divergence hole units are counterclockwise; or the rotation directions of the divergence holes 3121 in one set of the divergence hole units are clockwise, and the rotation directions of the divergence holes 3121 in the other set of the divergence hole units are counterclockwise.
In the embodiment of the present invention, the diverging holes 3121 are obliquely arranged relative to the circumferential direction of the annular boss 312, so that a cooling air flow in a certain swirling state can be generated during the cooling air flowing through the diverging holes 3121, thereby being beneficial to further enhancing the convective heat exchange strength between the cooling air and the annular boss 312 and improving the cooling effect of the interstage section 3.
In an alternative embodiment, as shown in fig. 6, the plurality of diverging holes 3121 form a plurality of sets of diverging hole units, at least one set of diverging hole units being disposed in a first rotational direction at the annular boss 312 and at least one set of diverging hole units being disposed in a second rotational direction at the annular boss 312, the first rotational direction being opposite the second rotational direction.
Specifically, the diverging holes 3121 are obliquely arranged relative to the circumferential direction of the annular boss 312, and the plurality of diverging holes 3121 are annularly arranged in an array to form a plurality of groups of diverging hole units, the groups of which are arranged according to actual requirements. The first direction of rotation is opposite to the second direction of rotation, e.g., the first direction of rotation is clockwise and the second direction of rotation is counter-clockwise, the directions of rotation of the plurality of diverging holes 3121 in the at least one set of diverging hole units are all clockwise and the directions of rotation of the plurality of diverging holes 3121 in the at least one set of diverging hole units are all counter-clockwise.
Further, the rotation directions of the diverging holes 3121 in two adjacent diverging hole units are opposite, for example, four diverging hole units are sequentially arranged on the annular boss 312 along the radial direction of the annular boss 312, which are respectively defined as a first diverging hole unit, a second diverging hole unit, a third diverging hole unit and a fourth diverging hole unit. The rotation directions of the diverging holes 3121 in the first set of diverging hole units are all clockwise, the rotation directions of the diverging holes 3121 in the second set of diverging hole units are all counterclockwise, the rotation directions of the diverging holes 3121 in the third set of diverging hole units are all clockwise, and the rotation directions of the diverging holes 3121 in the fourth set of diverging hole units are all counterclockwise.
In the embodiment of the present invention, the diverging holes 3121 in at least one group of diverging hole units are disposed on the annular boss 312 along the first rotation direction, the diverging holes 3121 in at least one group of diverging hole units are disposed on the annular boss 312 along the second rotation direction, and the rotation directions of the diverging holes 3121 in two adjacent groups of diverging hole units are different, so that the cooling gas can generate cooling gas flows in different rotational flow states to meet different working condition requirements.
In an alternative embodiment, the diverging holes 3121 in two adjacent sets of diverging hole units are arranged in a staggered manner, and under the condition that the number of the diverging holes 3121 is fixed, the plurality of diverging holes 3121 are arranged in a staggered manner to cover the whole area of the annular boss 312 to the greatest extent, so that the cooling gas can make full contact with the annular boss 312, and further the strength of the convective heat exchange between the cooling gas and the annular boss 312 is enhanced.
In an alternative embodiment, the diameter of the diverging aperture 3121 is 0.1-1 millimeters. The number of the diverging holes 3121 is set according to actual needs, for example, the number of the diverging holes 3121 is 10 to 1000. The diameter of the divergence hole 3121 is 0.1-1 mm, which not only can ensure the contact area of the cooling gas and the annular boss 312 and enhance the convection heat exchange strength of the cooling gas and the annular boss 312, but also can prevent the flame at the second end surface of the annular boss 312 from reversely channeling into the circulation gap along the divergence hole 3121.
As shown in fig. 7, 8 and 9, in an alternative embodiment, the second cooling structure includes a plurality of impingement holes 3131, the plurality of impingement holes 3131 being arranged in an annular array on the impingement portion 313, and the cooling gas within the inlet chamber being capable of passing through the bleed holes 3111 and the impingement holes 3131 in sequence.
Specifically, the impact portion 313 and the guide portion 311 enclose a gas collecting chamber, the impact portion 313 is provided with an impact hole 3131, and the impact hole 3131 penetrates through two opposite surfaces of the impact portion 313. The plurality of impact holes 3131 are arranged in an annular array, and in the radial direction of the impact portion 313, the plurality of impact holes 3131 form a plurality of groups of impact hole units, the number of which is set according to actual requirements, for example, the number of the impact hole units is one group, two groups or a plurality of groups.
The outer wall surface of the impact portion 313 is flush with the outer wall surface of the annular boss 312, i.e., the outer diameter of the impact portion 313 is equal to or similar to the outer diameter of the annular boss 312. After flowing through the air introducing holes 3111, the cooling air in the air inlet chamber flows into the air collecting chamber, flows through the impact holes 3131, flows to the first end face of the annular boss 312, and the impact holes 3131 enhance the fluidity of the cooling air, so that the heat convection strength of the cooling air and the annular boss 312 is enhanced.
In the embodiment of the present invention, the impact portion 313 is disposed between the guide portion 311 and the annular boss 312, and the cooling gas flows through the air guide hole 3111, further flows through the impact holes 3131, and flows to the first end surface of the annular boss 312, where the impact holes 3131 enhance the fluidity of the cooling gas, so as to be beneficial to enhancing the convective heat exchange strength between the cooling gas and the annular boss 312 region, and enhancing the cooling effect on the interstage section 3.
In an alternative embodiment, as shown in fig. 8, a plurality of impingement holes 3131 form a plurality of groups of impingement hole units, and impingement holes 3131 in adjacent groups of impingement hole units are offset.
Specifically, the plurality of impact holes 3131 are arranged in an annular array, and in the radial direction of the impact portion 313, the plurality of impact holes 3131 form a plurality of groups of impact hole units, and the impact holes 3131 in two adjacent groups of impact hole units are arranged in a staggered manner in the circumferential direction. The impact holes 3131 in the two adjacent groups of impact holes 3131 units are distributed in a staggered manner, under the condition that the number of the impact holes 3131 is fixed, the impact holes 3131 can cover the whole area of the impact part 313 to the greatest extent, so that cooling gas can fully contact with the first end face of the annular boss 312 after flowing through the impact holes 3131, and further the convection heat exchange strength of the cooling gas and the annular boss 312 is enhanced.
In the embodiment of the present invention, the impact holes 3131 in two adjacent groups of impact hole units are arranged in a staggered manner, so that the impact holes 3131 can cover the whole area of the impact portion 313 to the greatest extent, which is beneficial for the cooling gas to fully contact with the first end surface of the annular boss 312 after flowing through the impact holes 3131, and enhances the heat dissipation strength of the annular boss 312.
In an alternative embodiment, the diameter of the impingement holes 3131 is 0.1-1 mm, so that a plurality of impingement holes 3131 can be provided on the impingement portion 313, the number of impingement holes 3131 can be 10-1000, and the fluidity of the cooling gas can be enhanced in a limited space.
Further, as shown in fig. 10, 11 and 12, the cooling gas in the intake chamber cools the inter-stage section 3 through the first cooling structure and the second cooling structure.
Specifically, the guide portion 311 and the annular boss 312 are disposed at intervals along the axial direction of the inner sleeve 31, an impact portion 313 is further disposed between the guide portion 311 and the annular boss 312, and the impact portion 313 and the guide portion 311 enclose a gas collecting chamber. The guide portion 311 is provided with a plurality of bleed holes 3111, and the plurality of bleed holes 3111 may be distributed in an annular array; the impact portion 313 is provided with a plurality of impact holes 3131, and the plurality of impact holes 3131 may be arranged in an annular array; the annular boss 312 is provided with a plurality of diverging holes 3121, and the plurality of diverging holes 3121 may be arranged in an annular array.
After flowing through the plurality of air entraining holes 3111, the cooling air in the air intake chamber flows into the air collection chamber, and after flowing through the plurality of impact holes 3131, the cooling air flows into the circulation gap between the impact portion 313 and the annular boss 312, and the plurality of impact holes 3131 enhance the fluidity of the cooling air, so that the strength of convective heat exchange between the cooling air and the annular boss 312 is enhanced. The cooling gas flows into the circulation gap between the impact portion 313 and the annular boss 312, and the cooling gas can further flow into the plurality of diffusion holes 3121 of the annular boss 312, and the plurality of diffusion holes 3121 increases the contact area between the cooling gas and the annular boss 312, which is beneficial to enhancing the convective heat exchange strength of the cooling gas and the annular boss 312.
As shown in fig. 11 and 12, the plurality of impact holes 3131 constitute a plurality of impact hole units, and the impact holes 3131 in adjacent two impact hole units are arranged offset in the circumferential direction. The plurality of diverging holes constitute a plurality of diverging hole units, and diverging holes 3121 in adjacent two diverging hole units are arranged in a staggered manner in the circumferential direction. The impact holes 3131 and the diverging holes 3121 can effectively enhance the heat convection intensity of the cooling gas and the annular boss 312, enhance the cooling effect on the inter-stage section 3, effectively avoid the ablation phenomenon of the inter-stage section 3, and ensure the service life of the inter-stage section 3.
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 (8)
1. A low-emission combustor head with interstage stage enhanced cooling, comprising: a precombustion stage, an interstage stage and a main combustion stage;
the pre-combustion stage is arranged at the inner wall surface of the interstage section, and the main combustion stage is arranged at the outer wall surface of the interstage section; the interstage section comprises an inner sleeve and an outer sleeve, and an air inlet cavity is formed by enclosing the inner sleeve and the outer sleeve; the guide part and the annular boss are arranged at the outlet end of the inner sleeve at intervals along the axial direction of the inner sleeve, the inner sleeve is connected with the outer sleeve through the guide part, and the guide part is provided with a gas guiding hole;
the annular boss is provided with a first cooling structure; an impact part is constructed between the guide part and the annular boss, an air collecting cavity is formed by enclosing the impact part and the guide part, and the impact part is provided with a second cooling structure;
the cooling gas in the air inlet cavity can penetrate through the air entraining holes and cool the interstage section through the first cooling structure and the second cooling structure;
the first cooling structure comprises a plurality of divergent holes, the divergent holes penetrate through two opposite end surfaces of the annular boss, and the divergent holes are arranged on the annular boss at intervals;
the second cooling structure comprises a plurality of impact holes, a plurality of impact hole annular arrays are arranged on the impact part, and cooling gas in the gas inlet cavity can sequentially penetrate through the gas guide holes and the impact holes.
2. The low-emission combustor head with interstage stage enhanced cooling of claim 1, wherein a plurality of said annular arrays of diverging holes are disposed in said annular boss, an axial direction of said diverging holes forming a first angle with a radial direction of said annular boss, said first angle ranging from 0 to 90 degrees.
3. The low-emission combustor head with interstage stage enhanced cooling of claim 2, wherein an axial direction of the diverging holes forms a second angle with a circumferential direction of the annular boss, the second angle ranging from 0-90 degrees.
4. The low-emission combustor head with interstage stage enhanced cooling of claim 3, wherein a plurality of said diverging holes form a plurality of sets of diverging hole units, at least one set of said diverging hole units being disposed in a first rotational direction at said annular boss, at least one set of said diverging hole units being disposed in a second rotational direction at said annular boss, said first rotational direction being opposite said second rotational direction.
5. The low-emission combustor head with interstage stage enhanced cooling of claim 4, wherein said diverging holes in adjacent two sets of said diverging hole units are offset.
6. The low-emission combustor head with interstage stage enhanced cooling of any of claims 1-5, wherein the diverging holes have a diameter of 0.1-1 mm.
7. The low-emission combustor head with interstage stage enhanced cooling of claim 1, wherein a plurality of said impingement holes form a plurality of groups of impingement hole units, said impingement holes in adjacent two groups of said impingement hole units being offset.
8. The low-emission combustor head with interstage stage enhanced cooling of claim 7, wherein the impingement holes have a diameter of 0.1-1 millimeters.
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| CN202210887828.8A CN115307178B (en) | 2022-07-26 | 2022-07-26 | Low emission combustor head scheme with interstage stage enhanced cooling |
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| CN115307178B true CN115307178B (en) | 2023-06-23 |
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| CN115307178A (en) | 2022-11-08 |
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