CN107366929B - Nozzle with divergent profile swirler - Google Patents
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- CN107366929B CN107366929B CN201710597634.3A CN201710597634A CN107366929B CN 107366929 B CN107366929 B CN 107366929B CN 201710597634 A CN201710597634 A CN 201710597634A CN 107366929 B CN107366929 B CN 107366929B
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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
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Abstract
The invention discloses a nozzle with a swirler with an expanding profile, comprising: the inner wall of the nozzle; an outer wall of the nozzle; and the swirler is clamped between the inner wall of the nozzle and the outer wall of the nozzle, and the outline of the swirler is in an expansion shape. The contour line of the axial cross section of the blade of the cyclone is set to be expanded, the flow channel between the outer wall of the nozzle of the cyclone and the inner wall of the nozzle is also set to be expanded, the flow channel between the outer wall of the nozzle and the middle cylinder is also set to be expanded, the mixing effect of fluid on the inner side and the outer side of the cyclone is enhanced through the expanded flow channel, and meanwhile, when the torsion angle of the cyclone is large, a smooth curved surface is obtained, and a good mixing effect is achieved.
Description
Technical Field
The invention belongs to the technical field of combustion devices, and relates to a nozzle with a swirler with an expanded profile.
Background
The gas turbine is widely applied to industries such as electric power, aviation, petrochemical industry and the like due to the characteristics of small single machine volume, large output power and the like. Due to energy crisis and environmental deterioration, there is an urgent need to develop efficient and clean combustion chambers, which are required to have the characteristics of reliable ignition, stable combustion, high efficiency, low emission, etc. At present, the environmental pollution problem in China is very serious, so the development of clean combustion technology of a gas turbine is very urgent.
At present, gas turbine manufacturers have developed various clean combustion technologies, such as lean premixed combustion technology, dilute phase premixed pre-evaporation technology, lean oil direct injection technology, catalytic combustion technology, etc., which can effectively reduce the emission of pollutants, but all of them face the problem of unstable combustion, and the combustor has a complex structure and many parts.
Injection devices, such as nozzles, are important components of gas turbines, the performance of which largely determines the efficiency, safety and stability of combustion. The swirler is used as a core component in the injection device, and the structure thereof has a great influence on the flow direction and the mixing effect of the fluid, and further has a great influence on combustion, and the conventional swirler has poor performance in the aspect of the mixing effect and has a complex structure, so that a swirler structure which can improve the mixing effect and has a simple structure is urgently needed to be provided.
Disclosure of Invention
Technical problem to be solved
The present disclosure provides a nozzle with a diverging profile swirler to at least partially solve the technical problems set forth above.
(II) technical scheme
According to one aspect of the present disclosure, there is provided a nozzle having a diverging profile swirler, comprising: the inner wall of the nozzle; an outer wall of the nozzle; and the swirler is clamped between the inner wall of the nozzle and the outer wall of the nozzle, and the outline of the swirler is in an expansion shape.
In some embodiments of the present disclosure, the downstream section of the swirler and nozzle outer wall is a diverging section; the downstream section of the inner wall of the nozzle is a convergent section; the upstream sections of the cyclone, the inner wall of the nozzle and the outer wall of the nozzle are straight sections; the nozzle as a whole has a straight upstream section and a divergent downstream section.
In some embodiments of the present disclosure, a straight flow passage is formed between an upstream section of the inner nozzle wall and an upstream section of the outer nozzle wall; an expanding flow passage is formed between the downstream section of the inner wall of the nozzle and the downstream section of the outer wall of the nozzle.
In some embodiments of the present disclosure, the contour line of the diverging section of the swirler comprises: the cyclone has an inner side contour line and an outer side contour line, the shape formed between the inner side contour line and the outer side contour line is an expansion shape, and the cross section area of the cyclone is gradually enlarged along the downstream direction.
In some embodiments of the present disclosure, the swirler further comprises: at the exit end of swirler, swirler inboard side outline line and swirler outside outline line are straight section outline line, and the length of this straight section outline line satisfies: between 1% and 10% of the height of the cyclone.
In some embodiments of the present disclosure, the length of the straight section contour line is 5% of the swirler height.
In some embodiments of the present disclosure, a nozzle having a diverging profile swirler further comprises: the middle cylinder is inserted into the swirler and divides the blades of the swirler into an inner ring and an outer ring in the radius direction; wherein the fluids of the inner ring of the cyclone enter the intermediate cylinder and intermingle with each other.
In some embodiments of the disclosure, the contour of the intermediate cylinder is an intermediate cylinder contour that is convergent, an expanding flow passage between the intermediate cylinder and the swirler outer contour is formed between the intermediate cylinder contour and the swirler outer contour, and the expanding flow passage between the intermediate cylinder and the swirler outer contour is expanding.
In some embodiments of the present disclosure, a nozzle having a diverging profile swirler further comprises: and the mesh plate is arranged at the outlet of the middle cylinder, and the axial direction of the upper hole of the mesh plate is parallel to the axial direction of the swirler.
In some embodiments of the present disclosure, the swirler has a profile that satisfies: the shapes of the inlet and outlet curves at the same circumferential position in one spatial period are as follows: the inlet section curve is arc-shaped, and the outlet section curve is in a shape like a Chinese character ji.
(III) advantageous effects
From the technical scheme, the nozzle with the cyclone with the expansion-shaped profile provided by the disclosure has the following beneficial effects:
the contour line of the axial cross section of the swirler vane is set to be in an expanding shape, the flow channel between the outer wall of the nozzle and the inner wall of the nozzle of the swirler is also set to be in an expanding shape, the flow channel between the outer wall of the nozzle and the middle cylinder is also set to be in an expanding shape, the flow channel in the expanding shape enhances the mixing effect of fluid on the inner side and the outer side of the swirler, and meanwhile, when the torsion angle of the swirler is large, a smooth curved surface can be obtained, and a good mixing effect is achieved.
Drawings
FIG. 1 is a half-sectional view of a nozzle having a diverging profile swirler, according to an embodiment of the present disclosure.
FIG. 2 is a schematic view of a flared profile configuration of a swirler in accordance with an embodiment of the present disclosure.
FIG. 3 is a schematic illustration of the operation of a cyclone having a diverging profile according to an embodiment of the disclosure.
FIG. 4 is a flow chart of a method of generating a nozzle with a diverging profile swirler according to an embodiment of the present disclosure.
Fig. 5A-5E are schematic diagrams of a process for creating a curved surface of a swirler with a flared profile according to an embodiment of the present disclosure.
Fig. 5A is a schematic diagram of a straight curved surface formed by one cycle of an inlet cross-sectional curve and an outlet cross-sectional curve in accordance with an embodiment of the present disclosure.
Fig. 5B is a schematic diagram of a cross-sectional curved surface obtained by cutting the straight curved surface through a plurality of planes perpendicular to the axial direction at the axial position of the straight curved surface shown in fig. 5A according to an embodiment of the present disclosure.
Fig. 5C is a schematic diagram of a torsion curve obtained by rotating the cross-sectional curve shown in fig. 5B and the outlet cross-sectional curve by a certain angle in the circumferential direction according to an embodiment of the present disclosure.
FIG. 5D is a schematic diagram of the twist curve of FIG. 5C connected into a curved surface to obtain a curved surface of one cycle of the swirler, according to an embodiment of the disclosure.
FIG. 5E is a schematic diagram of one cycle of curved surfaces of the cyclones of FIG. 5D arrayed along a circumferential direction to obtain curved surfaces of the cyclones according to an embodiment of the present disclosure.
FIG. 6 is a perspective view of a nozzle with a diverging profile swirler with an intermediate cylinder in accordance with an embodiment of the present disclosure.
Fig. 6A is a schematic diagram of an expanding channel formed between a middle cylindrical contour line of the swirler structure shown in fig. 6 and a swirler contour line according to an embodiment of the disclosure.
FIG. 6B is a schematic illustration of a screen plate disposed at the middle cylinder outlet of the cyclone structure shown in FIG. 6 according to an embodiment of the disclosure.
FIG. 7 is a schematic illustration of a cyclone with a straight section exit profile in comparison to the cyclone shown in FIG. 2 according to an embodiment of the present disclosure.
[ notation ] to show
110-a cyclone;
111-cyclone inside fluid inlet; 112-cyclone outer fluid inlet;
120-nozzle inlet;
121-inner wall of nozzle; 122-nozzle outer wall;
123-nozzle outlet;
130-straight flow path of nozzle inlet; 133-divergent flow path of nozzle outlet;
210-swirler inner profile line; 220-cyclone outer contour line;
231-expanded flow passages of the swirler;
310-radial movement of the fluid outside the cyclone;
320-radial movement of the fluid inside the cyclone;
401-inlet section curve of one period straight curved surface of the cyclone;
400-straight curved surface;
402-an outlet section curve of a periodic straight curved surface of the cyclone;
411-first section curve of straight curved surface; 412-straight curved second section curve;
413-third section curve of straight curved surface;
421-the curve of the straight curved surface after the first section curve is rotated;
422-the curve of the second section curve of the straight curved surface after rotation;
423-curve of the third section curve of the straight curved surface after rotation;
424-the curve of the outlet cross section of the straight curved surface after rotation;
500-middle cylinder; 510-middle cylinder contour line;
511-mesh plate;
521-an expanding flow channel between the middle cylinder and the outer profile of the cyclone;
610-straight outlet outline line of the outer side of the swirler;
620-straight outlet outline inside cyclone.
Detailed Description
The utility model provides a nozzle with expansion profile swirler sets up the contour line of the axial cross-section of the blade of swirler to the expansion shape, also sets up the runner between nozzle outer wall and the nozzle inner wall to the expansion shape, and the runner between nozzle outer wall and the middle drum also sets up to the expansion shape, and the above expansion shape runner has strengthened the mixing effect of the inside and outside both sides fluid of swirler, can also obtain smooth curved surface when the torsion angle of swirler is very big simultaneously, reaches good mixing effect.
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
A first embodiment of the present disclosure provides a nozzle having a diverging profile swirler.
FIG. 1 is a half-sectional view of a nozzle having a diverging profile swirler in accordance with an embodiment of the present disclosure; FIG. 2 is a schematic view of a flared profile configuration of a swirler in accordance with an embodiment of the present disclosure. With reference to fig. 1 and 2, the nozzle with a diverging profile swirler of the present disclosure comprises: a cyclone 110; a nozzle inner wall 121 disposed inside the cyclone 110; a nozzle outer wall 122 disposed outside the swirler 110; the downstream sections of the swirler 110 and the nozzle outer wall 122 are expanding sections, the downstream section of the nozzle inner wall 121 is a converging section, the upstream sections of the swirler 110, the nozzle inner wall 121 and the nozzle outer wall 122 are flat sections, and the nozzle integrally forms a flat upstream section and an expanding downstream section.
a nozzle inlet 120 disposed at the fluid inlet, comprising: a cyclone inner fluid inlet 111 formed between the nozzle inner wall 121 and an inner side wall surface of the cyclone 110; a swirler outer fluid inlet 112 formed between the nozzle outer wall 122 and an outer wall surface of the swirler 110; a nozzle outlet 123 disposed at the fluid outlet; a nozzle inlet straight flow channel 130 disposed between the nozzle inner wall 121 and the nozzle outer wall 122 at the nozzle inlet 120; and a nozzle outlet divergent channel 133 disposed between the nozzle inner wall 121 and the nozzle outer wall 122 at the nozzle outlet 123.
The various components of the nozzle of the present embodiment having a diverging profile swirler are described below.
In the present embodiment, the swirler 110 has an expanded profile, and referring to fig. 2, the expanded profile means: the shape formed between the swirler inner contour 210 and the swirler outer contour 220 of the swirler 110 is flared, and the cross-sectional area corresponding to the nozzle outlet 123 is larger than the cross-sectional area at the nozzle inlet 120; wherein, the swirler inner contour line 210 is a tangent line of the inner side wall surface of the swirler 110; swirler outer contour 220 is a tangent to the outer wall of swirler 110.
In this embodiment, the cyclone inner fluid inlet 111 is circular and the cyclone outer fluid inlet 112 is also circular.
In this embodiment, an expanded flow passage is also formed between the swirler inner contour 210 and the swirler outer contour 220, and is disposed in the expanded flow passage formed by the nozzle inner wall 121 and the nozzle outer wall 122.
The cross-sectional sizes of the cyclones corresponding to the nozzle inlet 120 and the nozzle outlet 123 are different, and the cross-sectional area corresponding to the nozzle outlet 123 is larger than that of the nozzle inlet 120, so that a divergent channel 133 of the nozzle outlet is formed at the nozzle outlet.
The operation of the cyclone of this embodiment with an expanded profile will now be described.
FIG. 3 is a schematic illustration of the operation of a cyclone having a diverging profile according to an embodiment of the disclosure. Referring to fig. 3, while the fluid moves axially in the cyclone, it also moves along the radial direction, and the radial direction 310 of the fluid outside the cyclone is directed to the center of the circle; the radial motion 320 of the fluid inside the cyclone is far from the center of the circle, so that the radial motion directions of the adjacent fluid inside and outside the cyclone are opposite, and the strong shearing motion can enhance the mixing of the fluid on both sides of the cyclone at the outlet of the nozzle, therefore, the flow passage between the inner contour line 210 and the outer contour line 220 of the cyclone must be arranged in an expanding shape to be capable of maintaining the strong shearing motion along the radial direction; if the flow passage between the inner and outer contour lines of the swirler is straight or convergent, radial movement of the fluid inside and outside the swirler cannot be formed, and thus, radial strong shearing movement cannot be formed, which is not favorable for mixing of the fluid inside and outside the swirler at the nozzle outlet. Therefore, the swirler of the present disclosure employs a structure with an expanded profile.
In a second embodiment of the present disclosure, a method of forming a nozzle having a diverging profile swirler as in the first embodiment is provided.
FIG. 4 is a flow chart of a method of generating a nozzle with a diverging profile swirler according to an embodiment of the present disclosure. As illustrated in fig. 4, the method of the present disclosure for a nozzle having a diverging profile swirler, comprises:
step S402: obtaining a straight curved surface through inlet and outlet curves positioned at the same circumferential position in a space period, and then obtaining a cross-section curve of the swirler on the straight curved surface;
in this embodiment, the shapes of the inlet and outlet curves at the same circumferential position in one spatial period satisfy: the inlet section curve is arc-shaped, and the outlet section curve is in a shape of Chinese character ji; the inlet curve and the outlet curve may directly form a straight curved surface, and in this embodiment, a preferable method for obtaining the cyclone cross-sectional curve on the straight curved surface is as follows: cutting the straight curved surface by using planes which are equidistant and vertical to the axial direction to obtain a section curve of the swirler;
step S404: twisting the cross-section curves of the cyclones at different positions to obtain the cross-section curves of the cyclones after rotation;
in this embodiment, the torsion angle preferably gradually increases along the downstream direction according to a linear distribution rule; the distribution rule of the method meets the following requirements: the torsion angles of the cross-sectional curves of the cyclones at different positions are as follows: H/H E, wherein H is the axial height of the swirler, E is the torsion angle of the swirler, and H is the axial height of the cross-section curve of the swirler at different positions;
step S406: forming a curved surface by using the section curve of the rotated swirler to obtain a curved surface of the swirler in one period;
step S408: and arraying the curved surfaces of the cyclones in one period along the circumferential direction to obtain the curved surfaces of the cyclones.
Fig. 5A-5E are schematic diagrams of a process for creating a curved surface of a swirler with a flared profile according to an embodiment of the present disclosure. Fig. 5A is a schematic diagram of a straight curved surface formed by one cycle of an inlet cross-sectional curve and an outlet cross-sectional curve in accordance with an embodiment of the present disclosure. Fig. 5B is a schematic diagram of a cross-sectional curved surface obtained by cutting the straight curved surface through a plurality of planes perpendicular to the axial direction at the axial position of the straight curved surface shown in fig. 5A according to an embodiment of the present disclosure. Fig. 5C is a schematic diagram of a torsion curve obtained by rotating the cross-sectional curve shown in fig. 5B and the outlet cross-sectional curve by a certain angle in the circumferential direction according to an embodiment of the present disclosure. FIG. 5D is a schematic diagram of the twist curve of FIG. 5C connected into a curved surface to obtain a curved surface of one cycle of the swirler, according to an embodiment of the disclosure. FIG. 5E is a schematic diagram of one cycle of curved surfaces of the cyclones of FIG. 5D arrayed along a circumferential direction to obtain curved surfaces of the cyclones according to an embodiment of the present disclosure.
Please refer to fig. 5A to 5E for describing the method for generating the cyclone.
Referring to fig. 5A, an inlet cross-sectional curve 401 of a straight curved surface of one cycle of the cyclone and an outlet cross-sectional curve 402 of a straight curved surface of one cycle of the cyclone are located at the same circumferential position, the inlet cross-sectional curve 401 of the straight curved surface of one cycle of the cyclone is arc-shaped, the outlet cross-sectional curve 402 of the straight curved surface of one cycle of the cyclone is n-shaped, and a straight curved surface 400 can be formed by the two curves; referring to fig. 5B, three planes which are equally spaced and perpendicular to the axial direction are made at the axial positions 1/4, 1/2 and 3/4 of the straight curved surface 400 to intercept the straight curved surface 400, so as to obtain three section curves at different axial positions of the straight curved surface 400, namely a first section curve 411 of the straight curved surface, a second section curve 412 of the straight curved surface and a third section curve 413 of the straight curved surface; referring to fig. 5C, the three section curves and the outlet section curve 402 of the straight curved surface in one cycle of the cyclone are rotated by a certain angle in the circumferential direction, preferably, the rotation angles are linearly distributed in the axial direction, for example, in this embodiment, the rotation angle of the cyclone is 120 °, the rotation angle of the first section curve 411 of the straight curved surface is 30 °, the rotation angle of the second section curve 412 of the straight curved surface is 60 °, the rotation angle of the third section curve 413 of the straight curved surface is 90 °, and the rotation angle of the outlet section curve 402 of the straight curved surface in one cycle of the cyclone is 120 °, so as to obtain four curves, that is, a curve 421 after the first section curve of the straight curved surface is rotated, a curve 422 after the second section curve of the straight curved surface is rotated, a curve 423 after the third section curve of the straight curved surface is rotated, and a; referring to fig. 5D, a curved surface of the cyclone in one period is obtained by making curved surfaces with curves 421, 422, 423 and 424; referring to fig. 5E, the curved surface of the cyclone 110 is obtained by arraying the cyclone in a circumferential direction with a periodic curved surface. With this method, a smooth curved surface can also be obtained when the torsion angle of the swirler is large, e.g. in this embodiment the torsion angle of the swirler is 120 °, with which a smooth curved surface is obtained. Preferably, the twisting rules of the cross-section curves of the cyclones at different axial positions are in linear distribution, namely the twisting angles of the cross-section curves of the cyclones at different positions are H/H × E, wherein H is the axial height of the cyclones, E is the twisting angle of the cyclones, and H is the axial height of the cross-section curves of the cyclones at different positions.
A third embodiment of the present disclosure provides a nozzle having a diverging profile swirler. For the purpose of brevity, any technical features that can be applied to any of the above embodiments are described herein, and the same description need not be repeated.
FIG. 6 is a perspective view of a nozzle with a diverging profile swirler with an intermediate cylinder in accordance with an embodiment of the present disclosure. Comparing fig. 1, 5E and 6, the nozzle having the cyclone with the divergent profile in the third embodiment of the present disclosure is different from the first embodiment in that the structure of the middle cylinder 500 is added and the mesh plate 511 is provided at the outlet of the middle cylinder 500.
A third embodiment of a nozzle having a diverging profile swirler is described below.
Referring to fig. 6, the middle cylinder 500 is inserted into the vanes of the cyclone 110, and the vanes of the cyclone 110 are divided into an inner ring and an outer ring in the radial direction, and the inner ring fluid of the cyclone 110 enters the middle cylinder and is mixed with each other.
Referring to fig. 5A, the middle cylindrical contour 510 is convergent, such that a divergent channel 521 is formed between the middle cylindrical contour 510 and the outer swirler contour 220, which ensures strong shearing motion of the outer annular fluid of the swirler 500 in the radial direction, and enhances mixing of the inner and outer fluid of the swirler at the nozzle outlet 123.
Referring to fig. 5B, a mesh plate 511 is further disposed at the outlet of the middle cylinder 500, and the axial direction of the holes of the mesh plate 511 is parallel to the axial direction of the nozzle, so that the fluid at the outlet of the middle cylinder 500 keeps moving axially, while the fluid at the periphery of the middle cylinder 500 rotates, thereby improving the tempering margin of the nozzle.
A fourth embodiment of the present disclosure provides a nozzle having a diverging profile swirler. For the purpose of brevity, any technical features that can be applied to any of the above embodiments are described herein, and the same description need not be repeated.
FIG. 7 is a schematic illustration of a cyclone with a straight section exit profile in comparison to the cyclone shown in FIG. 2 according to an embodiment of the present disclosure. Comparing fig. 2 and 7, the nozzle of the fourth embodiment of the present disclosure with the divergent profile cyclone differs from the first embodiment in that the cyclone 110 of the present embodiment is further provided with a straight outlet profile at the nozzle outlet 123.
Referring to fig. 7, the cyclone 110 has a straight outlet contour line, and a straight flow passage is formed between the outer straight outlet contour line 610 of the cyclone and the inner straight outlet contour line 620 of the cyclone, which has the advantage of increasing the strength of the swirling flow, but the length of the straight section is not too large, otherwise the fluid cannot form a radial strong shearing motion at the outlet of the nozzle, and mixing of the fluid on two sides of the cyclone is not facilitated, and the length of the straight section is any value (including an end point) between 1% and 10% of the height of the cyclone, and is preferably 5% of the height of the cyclone.
It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. In addition, the above definitions of the components are not limited to the specific structures and shapes mentioned in the embodiments, and those skilled in the art may easily modify or replace them, for example:
(1) the structure of the swirler and the nozzle can also adopt other structures as long as the same functions can be completed;
(2) examples of parameters that include particular values may be provided herein, but the parameters need not be exactly equal to the corresponding values, but may be approximated to the corresponding values within acceptable error tolerances or design constraints;
(3) directional phrases used in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., refer only to the orientation of the attached drawings and are not intended to limit the scope of the present invention;
(4) the embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e. technical features in different embodiments may be freely combined to form further embodiments.
In summary, the present disclosure provides a nozzle of a swirler with an expanded profile, wherein a contour line of an axial cross section of a vane of the swirler is set to be expanded, a flow channel between an outer wall of the nozzle and an inner wall of the nozzle is also set to be expanded, and a flow channel between the outer wall of the nozzle and a middle cylinder is also set to be expanded, so that the structure of the expanded flow channel enhances a mixing effect of fluids at the inner side and the outer side of the swirler, and simultaneously, when a torsion angle of the swirler is large, a smooth curved surface can be obtained, thereby achieving a good mixing effect; a middle cylinder can be additionally arranged, and a straight section is arranged at the outlet of the cyclone, so that the cyclone strength is increased; the swirler generating method is adopted to generate the nozzle of the swirler with the expansion-shaped profile, the method is generalizable, and the generated structure is simple.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (7)
1. A nozzle with a diverging profile swirler, comprising:
the inner wall of the nozzle;
an outer wall of the nozzle; and
the swirler is clamped between the inner wall and the outer wall of the nozzle, and the outline of the swirler is in an expansion shape;
the middle cylinder is inserted into the swirler and divides the blades of the swirler into an inner ring and an outer ring in the radius direction;
wherein the fluid of the inner ring of the cyclone enters the middle cylinder and is mixed with the fluid of the inner ring of the cyclone; the contour line of the middle cylinder is a middle cylinder contour line, the middle cylinder contour line is in a convergent shape, an expanded flow channel between the middle cylinder and the outer side contour of the swirler is formed between the middle cylinder contour line and the outer side contour of the swirler, and the expanded flow channel between the middle cylinder and the outer side contour of the swirler is in an expanded shape;
at the exit end of swirler, swirler inboard side outline line and swirler outside outline line are straight section outline line, the length of straight section outline line satisfies: between 1% and 10% of the height of the cyclone.
2. The nozzle of claim 1 having a diverging profile swirler, wherein:
the downstream sections of the swirler and the nozzle outer wall are expanding sections;
the downstream section of the inner wall of the nozzle is a convergent section;
the upstream sections of the cyclone, the inner wall of the nozzle and the outer wall of the nozzle are straight sections;
the nozzle has a generally straight upstream section and a diverging downstream section.
3. The nozzle of claim 2 having a diverging profile swirler, wherein:
forming a straight flow passage between an upstream section of the inner nozzle wall and an upstream section of the outer nozzle wall;
an expanding flow passage is formed between the downstream section of the inner nozzle wall and the downstream section of the outer nozzle wall.
4. The nozzle of claim 2, wherein the contour line of the diverging section of the swirler comprises:
the cyclone comprises a cyclone inner side contour line and a cyclone outer side contour line, wherein the shape formed between the cyclone inner side contour line and the cyclone outer side contour line is an expansion shape, and the cross section area of the cyclone is gradually enlarged along the downstream direction.
5. The nozzle of claim 1 wherein the straight section contour line has a length of 5% of the swirler height.
6. The nozzle of claim 1 having a diverging profile swirler, further comprising:
and the mesh plate is arranged at the outlet of the middle cylinder, and the axial direction of the upper hole of the mesh plate is parallel to the axial direction of the swirler.
7. The nozzle of any one of claims 1 to 6 having a diverging profile swirler, wherein the inlet cross-sectional curves of the swirlers at the same circumferential position are circular arcs and the outlet cross-sectional curves are "zigzags".
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| CN105674263A (en) * | 2016-02-23 | 2016-06-15 | 中国科学院工程热物理研究所 | Nozzle with mixing combustion stabilizing structures, nozzle array and combustor |
| CN106051826A (en) * | 2016-06-12 | 2016-10-26 | 哈尔滨工程大学 | Pyrolysis fuel gas and air rapid mixing device |
| CN106705122A (en) * | 2016-12-09 | 2017-05-24 | 中国科学院工程热物理研究所 | Nozzle with inner and outer mixing zones, nozzle array and burner |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2521127B (en) * | 2013-12-10 | 2016-10-19 | Rolls Royce Plc | Fuel spray nozzle |
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2017
- 2017-07-20 CN CN201710597634.3A patent/CN107366929B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2930430A1 (en) * | 2014-04-07 | 2015-10-14 | Siemens Aktiengesellschaft | A burner tip and a burner for a gas turbine |
| CN105674263A (en) * | 2016-02-23 | 2016-06-15 | 中国科学院工程热物理研究所 | Nozzle with mixing combustion stabilizing structures, nozzle array and combustor |
| CN106051826A (en) * | 2016-06-12 | 2016-10-26 | 哈尔滨工程大学 | Pyrolysis fuel gas and air rapid mixing device |
| CN106705122A (en) * | 2016-12-09 | 2017-05-24 | 中国科学院工程热物理研究所 | Nozzle with inner and outer mixing zones, nozzle array and burner |
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| CN107366929A (en) | 2017-11-21 |
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