CN111174231A - Micro-mixing nozzle and design method thereof - Google Patents
Micro-mixing nozzle and design method thereof Download PDFInfo
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- CN111174231A CN111174231A CN201811339050.7A CN201811339050A CN111174231A CN 111174231 A CN111174231 A CN 111174231A CN 201811339050 A CN201811339050 A CN 201811339050A CN 111174231 A CN111174231 A CN 111174231A
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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
- F23R3/286—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
Abstract
The invention discloses a micro-mixing nozzle and a design method thereof. The design method of the micro-mixing nozzle introduces the design flow of the flame surface and carries out parametric research on the flame surface and the nozzle outlet profile.
Description
Technical Field
The invention relates to the technical field of gas turbines, in particular to a micro-mixing nozzle and a design method thereof.
Background
The mixture of compressed air and fuel is combusted in a combustor of the gas turbine, producing high temperature flue gases that push the turbine to do work, wherein the combustor mixes and injects the fuel and air through its nozzles (also commonly referred to as fuel nozzles) into the combustion zone. The mixing uniformity of fuel and air is an important factor influencing the pollutant emission of the gas turbine, and the improvement of the mixing uniformity of fuel and air can reduce the pollutant emission.
In the related art, a nozzle of a gas turbine has a multi-nozzle structure or a micro-mixing structure to improve the mixing capability of fuel and air. However, in the existing nozzle design process, a nozzle is designed firstly, then a flame surface of the nozzle is calculated, an experiment or calculation is carried out to determine the problem of combustion oscillation, and then the problem of combustion oscillation is weakened by other means (such as local structure modification or resonant cavity design and the like), so that the design period is long, and the risk of combustion oscillation is high. Moreover, the flame surface formed by the existing nozzle is a flat flame surface, the flame surface is fixed singly, the area of the flame surface is small, the heat release is concentrated too much, the energy release can cause stronger unstable heat release, and the combustion oscillation is easy to induce.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, the present invention proposes, on the one hand, a method of designing a micro-mixing nozzle that reduces the risk of combustion oscillations occurring and has a short design cycle.
The invention also provides a micro-mixing nozzle.
A method of designing a micro-mixing nozzle according to an embodiment of the first aspect of the invention comprises the steps of: s1, determining a preliminary structure of the micro-mixing nozzle, wherein the preliminary structure of the micro-mixing nozzle comprises the steps of determining the number of nozzles, the positions of the nozzles, the expansion ratio of the nozzles, the air flow path structure of the nozzles and the fuel flow path structure of the nozzles; s2, calculating a fluid and a combustion field of the preliminary structure of the micro-mixing nozzle, and extracting an acoustic boundary, wherein the acoustic boundary comprises temperature, pressure, density and sound velocity; s3, carrying out parametric study on the flame surface to design the flame surface; s4, solving a wave equation by combining the designed flame surface with the acoustic boundary to obtain the acoustic characteristics of the combustion system, wherein the acoustic characteristics comprise frequency, amplitude and growth rate; s5, judging the stability of the combustion system: if the combustion system is stable, outputting the information of the designed flame surface; if the combustion system is unstable, returning to S4 to modify the designed flame surface until the combustion system is stable, and if a stable combustion system cannot be obtained by modifying the designed flame surface, returning to S1 to modify the preliminary structure of the micro-mixing nozzle until the combustion system is stable; s6, after the combustion system is stabilized, carrying out parametric study on the nozzle outlet profile to design the nozzle outlet profile; s7, calculating a combustion field according to the designed nozzle outlet profile, and extracting the information of the flame surface corresponding to the designed nozzle outlet profile; s8, comparing whether the information of the flame surface corresponding to the nozzle outlet profile is consistent with the information of the designed flame surface output in the S5: outputting a final configuration of the micro-mixing nozzle if the two are consistent, the final configuration of the output micro-mixing nozzle comprising an output nozzle number, a nozzle location, a nozzle expansion ratio, a nozzle air flow path configuration, a nozzle fuel flow path configuration, a designed flame face, and a designed nozzle exit profile; if not, return to S7 modifies the nozzle outlet profile or return to S1 modifies the preliminary structure of the micro-mixing nozzle.
According to the design method of the micro-mixing nozzle, the design flow of the flame surface is introduced, the design of the flame stability is changed from the verification item to the design item, the design and processing cost is reduced, and the design rework is reduced; and the flame surface and the nozzle outlet profile are subjected to parametric research, and the design process can be accelerated according to the automatic optimization of the parameterization, so that the design period is short, and the risk of combustion oscillation is reduced.
In some embodiments, in S3, the shape of the flame surface is an arbitrary curved surface.
In some embodiments, the nozzle outlet profile is shaped as an arbitrary curve in S6.
In some embodiments, the information of the flame surface includes position, energy, temperature, and reaction speed.
A micro-mixing nozzle according to an embodiment of the second aspect of the invention comprises: a housing having a fuel chamber therein, the housing including a first end wall having a plurality of air inlets and at least one fuel inlet for supplying fuel into the fuel chamber, a second end wall having a plurality of ejection ports, and a peripheral wall between the first end wall and the second end wall, an outer wall surface of the second end wall being an arbitrary curved surface; a plurality of little hybrid tubes, little hybrid tube runs through fuel room, little hybrid tube has entrance point and blowout end, the entrance point with air inlet intercommunication, blowout end with the blowout port intercommunication, be equipped with the intercommunication on the little hybrid tube the inner chamber of little hybrid tube with the trompil in fuel room.
According to the micro-mixing nozzle disclosed by the embodiment of the invention, the spraying interface of the micro-mixing nozzle is provided with the outwards-protruding elliptical crown or spherical crown, so that the area of a flame surface is increased, the flame stability is enhanced, and the risk of combustion oscillation is reduced.
In some embodiments, the micro-mixing nozzle further comprises a baffle plate disposed within the fuel chamber, the baffle plate being spaced a lesser distance from the second end wall than the first end wall, the fuel chamber being divided into a first fuel chamber located between the first end wall and the baffle plate and a second fuel chamber located between the baffle plate and the second end wall, the first fuel chamber and the second fuel chamber being in communication by a communication aperture in the baffle plate, the fuel inlet being in communication with the second fuel chamber, the aperture in the micro-mixing tube communicating the first fuel chamber with the inner cavity of the micro-mixing tube.
In some embodiments, the micro-mixing nozzle further comprises a fuel tube having an inlet end that fits within the fuel inlet and an outlet end that passes through the first fuel chamber and communicates with the second fuel chamber.
In some embodiments, the fuel tube has a diameter of 2 to 10mm, and the micro-mixing tube has a diameter of 0.5 to 10 mm.
In some embodiments, the distance between the wall surface of the partition adjacent to the second end wall and the outer wall surface of the second end wall is 5 to 50 mm.
In some embodiments, the inlet end of the micro-mixing tube fits within the air inlet, the end face of the inlet end extends outwardly beyond the outer wall surface of the first end wall, the outlet end of the micro-mixing tube fits within the outlet, and the end face of the outlet end is flush with the outer wall surface of the second end wall.
Drawings
Fig. 1 is a flow chart of a method of designing a micro-mixing nozzle according to an embodiment of the present invention.
Fig. 2 is a schematic view of the overall structure of a micro-mixing nozzle according to an embodiment of the present invention.
Fig. 3 is a block diagram of a micro-mixing nozzle according to one embodiment of the present invention.
Fig. 4 is a structural view of a micro-mixing nozzle according to another embodiment of the present invention.
Fig. 5 is a partial enlarged view of a micro-mixing nozzle according to another embodiment of the present invention.
Reference numerals:
the fuel cartridge includes a housing 1, a fuel chamber 101, a first fuel chamber 1011, a second fuel chamber 1012, a first end wall 11, a second end wall 12, a peripheral wall 13, an air inlet 14, a fuel inlet 15, an ejection port 16, a micro-mixing tube 2, an opening 21, a fuel tube 3, a separator 4, and a communication hole 41.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the positional or orientational relationships indicated in the drawings to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
As shown in fig. 1, a method of designing a micro-mixing nozzle according to an embodiment of the present invention includes the steps of:
s1, determining a preliminary structure of the micro-mixing nozzle, wherein determining the preliminary structure of the micro-mixing nozzle comprises determining the number of nozzles, the positions of the nozzles, the expansion ratio of the nozzles, the structure of the nozzle air flow path, the structure of the nozzle fuel flow path and the like;
s2, calculating the fluid and combustion field of the preliminary structure of the micro-mixing nozzle, and extracting acoustic boundaries, wherein the acoustic boundaries comprise temperature, pressure, density, sound velocity and the like; here, it is understood that the fluid and combustion field calculations are performed by computational fluid dynamics software such as Fluent or Starccm +.
S3, carrying out parametric study on the flame surface to design the flame surface; here, it is understood that the design of the flame surface mainly refers to the design of the shape of the flame surface, wherein the shape of the flame surface is any curved surface, such as any smooth curved surface like a spherical crown or an elliptical crown; specifically, the parameterized equation for the flame surface is Z ═ f (X, Y), where Z ∈ (-m, m), X2+Y2≤R2. It will be appreciated that the design of the flame face shape is determined by giving the X, Y, Z coordinates of the points on each flame face, a parameterized approach is to give the X, Y, Z coordinate relationship.
S4, solving a wave equation by combining the designed flame surface with an acoustic boundary to obtain the acoustic characteristics of the combustion system, wherein the acoustic characteristics comprise frequency, amplitude and growth rate; here, it can be understood that the wave equation is the relationship between amplitude and X, Y, Z and t.
S5, judging the stability of the combustion system:
if the combustion system is stable, outputting information of a designed flame surface, wherein the information of the flame surface comprises position, energy, temperature, reaction speed and the like;
if the combustion system is unstable, returning to S4 to modify the designed flame surface until the combustion system is stable, and if the stable combustion system cannot be obtained by modifying the designed flame surface, returning to S1 to modify the preliminary structure of the micro-mixing nozzle until the combustion system is stable;
s6, after the combustion system has stabilized, a parametric study of the nozzle exit profile is performed to design the nozzle exit profile, where, as will be appreciated,the design of the nozzle outlet profile mainly refers to the design of the shape of the nozzle outlet profile, wherein the shape of the nozzle outlet profile is any curved surface, such as any smooth curved surface like a spherical crown or an elliptical crown; in particular, the parameterized equation for the nozzle exit profile is F ═ F (X, Y), where F ∈ (-n, n), X2+Y2≤R2. It will be appreciated that the parameterized approach is to give X, Y, F coordinate relationships by designing the nozzle outlet profile shape given the X, Y, F coordinates of the points on each nozzle outlet profile.
S7, calculating a combustion field according to the designed nozzle outlet profile, and extracting the information of the flame surface corresponding to the designed nozzle outlet profile; in other words, information such as the position, the energy, the temperature, the reaction speed and the like of a flame surface corresponding to the designed nozzle outlet profile is extracted through combustion field calculation; here, it is understood that the combustion field calculation is performed by software for calculating fluid mechanics, such as Fluent or Starccm +.
S8, comparing whether the information of the flame surface corresponding to the nozzle outlet profile is consistent with the information of the designed flame surface output in S5: if the two are consistent, outputting the final structure of the micro-mixing nozzle, wherein the final structure of the output micro-mixing nozzle comprises the number of output nozzles, the position of the nozzles, the expansion ratio of the nozzles, the structure of the nozzle air flow path, the structure of the nozzle fuel flow path, the designed flame surface, the designed nozzle outlet profile and the like; if they do not match, return to S7 modifies the nozzle outlet profile or return to S1 modifies the preliminary structure of the micro-mixing nozzle.
According to the design method of the micro-mixing nozzle, the design flow of the flame surface is introduced, the design of the flame stability is changed from the verification item to the design item, the design and processing cost is reduced, and the design rework is reduced; and the flame surface and the nozzle outlet profile are subjected to parametric research, and the design process can be accelerated according to the automatic optimization of the parameterization, so that the design period is short, and the risk of combustion oscillation is reduced.
It can be understood that according to the design method of the micro-mixing nozzle provided by the embodiment of the invention, firstly, the rough frame of the nozzle is determined, the combustion oscillation analysis is carried out on the rough frame of the nozzle design, the combustion chamber can be stabilized by changing different flame surface forms to determine what flame surface forms are adopted, then, the nozzle outlet profile is designed according to the flame surface requirements, and finally, the whole nozzle is designed in a matching manner. The design has the advantages that combustion oscillation analysis is carried out before the design of the nozzle, and the risk of combustion oscillation of the combustion chamber is reduced by reasonably designing the flame surface. It is understood herein that the stable combustion chamber includes the case where the combustion chamber does not have the problem of combustion oscillation, or, even if combustion oscillation exists, the amplitude is small.
A micro-mixing nozzle according to an embodiment of the present invention is described below with reference to fig. 2-5.
As shown in fig. 2 to 5, the micro-mixing nozzle according to an embodiment of the present invention, which can be used for a gas turbine, includes a case 1 and a plurality of micro-mixing pipes 2. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The housing 1 has a fuel chamber 101 therein, the housing 1 including a first end wall 11, a second end wall 12, and a peripheral wall 13, the peripheral wall 13 being located between the first end wall 11 and the second end wall 12. In other words, the peripheral wall 13 is a shroud, the left end of which is connected to the first end wall 11 and the right end of which is connected to the second end wall 12, so that the fuel chamber 101 is enclosed by the first end wall 11, the shroud and the second end wall 12. The terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection, or an integral part; may be directly connected or indirectly connected through an intermediate, unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The first end wall 11 has an air inlet 14 and a fuel inlet 15 therein, and fuel is supplied into the fuel chamber 101 through the fuel inlet 15; the second end wall 12 has a plurality of discharge ports 16 therein through which a mixture of fuel and air can be discharged, and the outer wall surface of the second end wall 12 is an arbitrary curved surface, for example, the outer wall surface of the second end wall 12 is an outwardly convex elliptical crown or spherical crown. In other words, as shown in fig. 2, the right wall surface of the second end wall 12 may be any curved surface designed by the method for designing the micro-mixing nozzle according to the embodiment of the present invention, for example, the right end surface of the second end wall 12 is a part of a curved surface of an ellipsoid or a part of a curved surface of a sphere, etc., so as to form an outwardly convex curved surface, thereby increasing the area of the flame surface.
Here, it is to be understood that "outer" is "outer" with respect to the fuel chamber 101 in a direction away from the fuel chamber 101 and "inner" in a direction toward the fuel chamber 101. As shown in fig. 3 and 4, the outer wall surface of the second end wall 12 is a right wall surface of the second end wall 12, and the right wall surface is a curved surface protruding rightward. It is understood that the right wall surface may be a curved surface having one curvature, or may include a plurality of curved surfaces having different curvatures.
The micro-mixing tube 2 penetrates the fuel chamber 101, and specifically, the diameter of the micro-mixing tube is 0.5mm to 10 mm. The micro-mixing tube 2 is provided with openings 21 to communicate the inner cavity of the micro-mixing tube 2 with the fuel chamber 101, the micro-mixing tube 2 having an inlet end and an outlet end, the inlet end communicating with the air inlet 14 for the air to enter the micro-mixing tube 2, it being understood that the air inlet 14 is provided in plurality for accommodating a plurality of micro-mixing tubes 2; the ejection end is communicated with the ejection port 16, the fuel entering the fuel chamber 101 from the fuel inlet 15 enters the inner cavity of the micro mixing tube 2 through the opening 21 on the micro mixing tube 2, and is mixed with the air in the micro mixing tube 2 to form a mixture of air and fuel, and then the mixture is transmitted to the ejection port 16 through the ejection end of the micro mixing tube 2, and the mixture is ejected from the ejection port 16.
In other words, as shown in fig. 3 and 4, the left end of the micro-mixing pipe 2 is an inlet end, the right end of the micro-mixing pipe 2 is an outlet end, the left end of the micro-mixing pipe 2 is communicated with the air inlet 14, and the right end of the micro-mixing pipe 2 is communicated with the ejection port 16.
Specifically, the left end of the micro mixing tube 2 is fitted in the air inlet 14, and the left end surface of the micro mixing tube 2 is flush with the left wall surface of the first end wall 11, that is, air directly enters the micro mixing tube 2 through the left end of the micro mixing tube 2, and the left end of the micro mixing tube 2 serves as the air inlet 14; or, the left end surface of the micro mixing tube 2 is located in the air inlet 14, that is, the air enters the micro mixing tube 2 through the air inlet 14 and then through the left end of the micro mixing tube 2; alternatively, the left end of the micro-mixing tube 2 extends outward beyond the outer wall surface of the first end wall 11, i.e. the left end of the micro-mixing tube 2 passes through the air inlet 14 of the first end wall 11 and extends out of the fuel chamber 101, and the air directly enters the micro-mixing tube 2 through the left end of the micro-mixing tube 2.
Further, the right end of the micro-mixing pipe 2 is fitted in the ejection port 16, and the right end face of the micro-mixing pipe 2 is flush with the right wall face of the second end wall 12, i.e., the mixture of air and fuel is ejected directly through the right end of the micro-mixing pipe 2, which is the ejection port 16; alternatively, the right end surface of the micro-mixing pipe 2 is positioned in the discharge port 16, and the mixture of air and fuel enters the discharge port 16 through the right end surface of the micro-mixing pipe 2 and is discharged from the discharge port 16.
According to the micro-mixing nozzle disclosed by the embodiment of the invention, the ejection interface of the micro-mixing nozzle is provided with the curved surface which protrudes outwards, so that a flame surface which is consistent with the curved surface in shape can be formed, the area of the flame surface is increased, the flame stability is enhanced, and the phenomenon of combustion oscillation is weakened.
Specifically, when the micro-mixing nozzle provided by the embodiment of the invention is applied to a burner, the burner comprises a flame tube and the micro-mixing nozzle provided by the embodiment of the invention, and the distance L1 from the outlet end face of the micro-mixing nozzle to the inlet of the flame tube is less than 1/2 of the total length L2 of the flame tube.
In some embodiments, the inner and outer wall surfaces of the second end wall 12 are parallel to each other. In other words, as shown in fig. 3 and 4, the left wall surface and the right wall surface of the second end wall 12 are parallel curved surfaces, in other words, the distance from any point of the left wall surface of the second end wall 12 to the right wall surface of the second end wall 12 along the thickness direction of the second end wall 12 is the same, that is, the left wall surface and the right wall surface of the second end wall 12 are identical in shape, so that the second end wall 12 forms a curved wall protruding outwards.
In some embodiments, the peripheral wall 13 is cylindrical and the first end wall 11 is a straight wall orthogonal to the central longitudinal axis of the peripheral wall 13, in other words, the first end wall 11 is a straight wall and perpendicular to the central longitudinal axis of the peripheral wall 13. Further, as shown in fig. 3 and 4, the first end wall 11 is disposed vertically, and the central longitudinal axis of the peripheral wall 13 is horizontal.
In some embodiments, the fuel inlet 15 has a plurality of fuel inlets 15, the plurality of fuel inlets 15 are evenly spaced, and the air inlets 14 are distributed around the fuel inlets 15. It will be appreciated that the fuel inlet 15 may also have one, i.e. at least one, fuel inlet 15.
In some embodiments, the micro-mixing nozzle further comprises a fuel tube 3, the fuel tube 3 being in communication with the fuel inlet 15 for supplying fuel into the fuel chamber 101. Specifically, the diameter of the fuel pipe 3 is 2mm to 20 mm.
In some embodiments, as shown in fig. 4 and 5, the micro-mixing nozzle further comprises a baffle 4, the baffle 4 being disposed within the fuel chamber 101, the baffle 4 being spaced from the second end wall 12 a distance less than the distance the baffle 4 is spaced from the first end wall 11. The fuel chamber 101 is divided into a first fuel chamber 1011 and a second fuel chamber 1012 by a partition plate 4, the first fuel chamber 1011 is located between the first end wall 11 and the partition plate 4, the second fuel chamber 1012 is located between the partition plate 4 and the second end wall 12, the first fuel chamber 1011 and the second fuel chamber 1012 are communicated through a communication hole 41 on the partition plate 4, a fuel inlet 15 is communicated with the second fuel chamber 1012, and an opening 21 on the micro-mixing pipe 2 communicates the first fuel chamber 1011 with the inner cavity of the micro-mixing pipe 2.
In some embodiments, the fuel tube 3 extends through the first fuel chamber 1011, the fuel tube 3 having a feed end (left end shown in fig. 4, 5) and a discharge end (right end shown in fig. 4, 5), the feed end of the fuel tube 3 communicating with the fuel inlet 15, the discharge end of the fuel tube 3 communicating with the second fuel chamber 1012. Specifically, the left end of the fuel pipe 3 is fitted in the fuel inlet 15 with the left end face of the fuel pipe 3 flush with the left wall face of the first end wall 11, or the left end face of the fuel pipe 3 extends outward beyond the left wall face of the first end wall 11; the right end of the fuel pipe 3 passes through the first fuel chamber 1011 and communicates with the second fuel chamber 1012, and the right end face of the fuel pipe 3 is flush with the right end face of the separator 4.
It will be appreciated that fuel is delivered through the fuel pipe 3 from left to right into the second fuel chamber 1012 and impinges on the left wall of the second end wall 12, cooling that wall, as shown in figure 5; the fuel in the second fuel chamber 1012 enters the first fuel chamber 1011 through the communicating hole 41 on the partition plate 4, and the fuel in the first fuel chamber 1011 enters the micro-mixing pipe 2 through the opening 21 on the micro-mixing pipe 2 to be mixed with the air in the micro-mixing pipe 2.
In some embodiments, the distance between the wall surface of the partition plate 4 adjacent to the second end wall 12 and the outer wall surface of the second end wall 12 is 5mm to 50mm, in other words, the distance between the outlet end surface of the first fuel chamber 1011 and the outlet end surface of the second fuel chamber 1012 is 5mm to 50 mm.
In some embodiments, the partition 4 and the second end wall 12 are parallel to each other. It is understood that the right end surface of the partition 4 may be a curved surface protruding rightward in conformity with the right wall surface of the second end wall 12, and also, the partition 4 may be a curved plate protruding rightward in conformity with the overall shape of the second end wall 12. By conforming the shape of the baffle plate 4 to the shape of the second end wall 12, the cooling of the second end wall 12 when fuel is supplied to the second fuel chamber 1012 is further enhanced. Further, the shape of the partition plate 4 is not limited thereto, and for example, the partition plate 4 and the second end wall 12 may not be parallel.
A micro-mixing nozzle according to an embodiment of the present invention is described below with reference to fig. 2 and 3.
As shown in fig. 2 to 3, the micro-mixing nozzle according to the embodiment of the present invention includes a housing 1, a plurality of micro-mixing pipes 2 having a diameter of 0.5mm to 10mm, and a plurality of fuel pipes 3 having a diameter of 2mm to 20 mm.
The housing 1 has a fuel chamber 101 therein, and the housing 1 includes a first end wall 11, a second end wall 12, and a peripheral wall 13, a left end of the peripheral wall 13 being connected to the first end wall 11, and a right end of the peripheral wall 13 being connected to the second end wall 12 to enclose the fuel chamber 101. The first end wall 11 has a plurality of air inlets 14 and a plurality of fuel inlets 15 therein, and the second end wall 12 has an ejection port 16. The peripheral wall 13 is cylindrical, the first end wall 11 is a straight wall orthogonal to the central longitudinal axis of the peripheral wall 13, the left wall surface and the right wall surface of the second end wall 12 are both arbitrarily curved surfaces, and the left wall surface and the right wall surface of the second end wall 12 are arranged in parallel with each other, i.e., the left wall surface and the right wall surface of the second end wall 12 are identical in shape so that the second end wall 12 forms a wall of an arbitrarily curved shape.
Little hybrid tube 2 runs through fuel room 101 and sets up, is equipped with the trompil 21 that communicates fuel room 101 and the inner chamber of little hybrid tube 2 on the little hybrid tube 2, and the left end and the air inlet 14 cooperation of little hybrid tube 2, and the left end face of little hybrid tube 2 and the left wall parallel and level of first endwall 11, the right-hand member and the spout 16 cooperation of little hybrid tube 2, and the right-hand member face of little hybrid tube 2 and the right wall parallel and level of second endwall 12.
The plurality of fuel pipes 3 are arranged at regular intervals, the micro-mixing pipe 2 is arranged around the fuel pipes 3, the right end of the fuel pipes 3 communicates with the fuel inlet 15, and the left end of the fuel pipes 3 extends leftward beyond the left wall surface of the first end wall 11, i.e., the fuel pipes 3 are located outside the fuel chamber 101.
A micro-mixing nozzle according to another embodiment of the present invention is described below with reference to fig. 4 and 5.
As shown in fig. 4 to 5, the micro-mixing nozzle according to the embodiment of the present invention includes a housing 1, a partition 4, a plurality of micro-mixing pipes 2, and a plurality of fuel pipes 3.
The partition plate 4 is provided in the fuel chamber 101 parallel to the second end wall 12, and the distance of the partition plate 4 from the second end wall 12 is smaller than the distance of the partition plate 4 from the first end wall 11. The fuel chamber 101 is divided into a first fuel chamber 1011 and a second fuel chamber 1012 by a partition plate 4, the first fuel chamber 1011 is located between the first end wall 11 and the partition plate 4, the second fuel chamber 1012 is located between the partition plate 4 and the second end wall 12, the first fuel chamber 1011 and the second fuel chamber 1012 are communicated through a communication hole 41 on the partition plate 4, a fuel inlet 15 is communicated with the second fuel chamber 1012, and an opening 21 on the micro-mixing pipe 2 communicates the first fuel chamber 1011 with the inner cavity of the micro-mixing pipe 2. The distance between the outlet end face of the first fuel chamber 1011 and the outlet end face of the second fuel chamber 1012 is 5mm to 50 mm.
The left end of the fuel pipe 3 extends outward beyond the left end face of the first end wall 11, the right end of the fuel pipe 3 passes through the first fuel chamber 1011 to communicate with the second fuel chamber 1012, and the right end face of the fuel pipe 3 is flush with the right end face of the partition plate 4.
The other construction and operation of the micro-mixing nozzle shown in fig. 4 and 5 may be the same as the embodiment shown in fig. 3 and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 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.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method of designing a micro-mixing nozzle, comprising the steps of:
s1, determining a preliminary structure of the micro-mixing nozzle, wherein the preliminary structure of the micro-mixing nozzle comprises the steps of determining the number of nozzles, the positions of the nozzles, the expansion ratio of the nozzles, the air flow path structure of the nozzles and the fuel flow path structure of the nozzles;
s2, calculating a fluid and a combustion field of the preliminary structure of the micro-mixing nozzle, and extracting an acoustic boundary, wherein the acoustic boundary comprises temperature, pressure, density and sound velocity;
s3, carrying out parametric study on the flame surface to design the flame surface;
s4, solving a wave equation by combining the designed flame surface with the acoustic boundary to obtain the acoustic characteristics of the combustion system, wherein the acoustic characteristics comprise frequency, amplitude and growth rate;
s5, judging the stability of the combustion system: if the combustion system is stable, outputting the information of the designed flame surface; if the combustion system is unstable, returning to S4 to modify the designed flame surface until the combustion system is stable, and if a stable combustion system cannot be obtained by modifying the designed flame surface, returning to S1 to modify the preliminary structure of the micro-mixing nozzle until the combustion system is stable;
s6, after the combustion system is stabilized, carrying out parametric study on the nozzle outlet profile to design the nozzle outlet profile;
s7, calculating a combustion field according to the designed nozzle outlet profile, and extracting the information of the flame surface corresponding to the designed nozzle outlet profile;
s8, comparing whether the information of the flame surface corresponding to the nozzle outlet profile is consistent with the information of the designed flame surface output in the S5: outputting a final configuration of the micro-mixing nozzle if the two are consistent, the final configuration of the output micro-mixing nozzle comprising an output nozzle number, a nozzle location, a nozzle expansion ratio, a nozzle air flow path configuration, a nozzle fuel flow path configuration, a designed flame face, and a designed nozzle exit profile; if not, return to S7 modifies the nozzle outlet profile or return to S1 modifies the preliminary structure of the micro-mixing nozzle.
2. The method of claim 1, wherein the flame surface has an arbitrary curved shape in S3.
3. The method of claim 2, wherein the nozzle exit profile is arbitrarily curved in shape at S6.
4. The method of designing a micro-mixing nozzle according to any of claims 1-3, wherein the information of the flame front comprises position, energy, temperature and reaction speed.
5. A micro-mixing nozzle, comprising:
a housing having a fuel chamber therein, the housing including a first end wall having a plurality of air inlets and at least one fuel inlet for supplying fuel into the fuel chamber, a second end wall having a plurality of ejection ports, and a peripheral wall between the first end wall and the second end wall, an outer wall surface of the second end wall being an arbitrary curved surface;
a plurality of little hybrid tubes, little hybrid tube runs through fuel room, little hybrid tube has entrance point and blowout end, the entrance point with air inlet intercommunication, blowout end with the blowout port intercommunication, be equipped with the intercommunication on the little hybrid tube the inner chamber of little hybrid tube with the trompil in fuel room.
6. The micro-mixing nozzle of claim 5, further comprising a baffle plate disposed within the fuel chamber, the baffle plate being spaced less from the second end wall than the first end wall, the fuel chamber being divided into a first fuel chamber between the first end wall and the baffle plate and a second fuel chamber between the baffle plate and the second end wall, the first fuel chamber and the second fuel chamber communicating through a communication aperture in the baffle plate, the fuel inlet communicating with the second fuel chamber, the aperture in the micro-mixing tube communicating the first fuel chamber with the inner cavity of the micro-mixing tube.
7. The micro-mixing nozzle of claim 6, further comprising a fuel tube having an inlet end that fits within the fuel inlet and an outlet end that passes through the first fuel chamber and communicates with the second fuel chamber.
8. The micro-mixing nozzle of claim 7, wherein the fuel tube has a diameter of 2 to 20mm, and the micro-mixing tube has a diameter of 0.5 to 10 mm.
9. The micro-mixing nozzle of claim 6, wherein the distance between the wall surface of the baffle adjacent the second end wall and the outer wall surface of the second end wall is 5 to 50 mm.
10. The micro-mixing nozzle of any one of claims 5-9, wherein the inlet end of the micro-mixing tube fits within the air inlet, the end face of the inlet end extends outward beyond the outer wall surface of the first end wall, the exit end of the micro-mixing tube fits within the exit port, and the end face of the exit end is flush with the outer wall surface of the second end wall.
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| CN111174231B (en) | 2022-03-25 |
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