CN107366929B - Nozzle with divergent profile swirler - Google Patents

Abstract

The invention discloses a nozzle with an expanding profile cyclone, comprising: a nozzle inner wall; a nozzle outer wall; By setting the contour line of the axial section of the swirler blade to be expanded, the flow channel between the nozzle outer wall and the nozzle inner wall of the cyclone is also set to be expanded, and the flow channel between the nozzle outer wall and the middle cylinder is also It is set to expand, and the above expansion channel enhances the mixing effect of the fluids on the inside and outside of the cyclone. At the same time, when the twist angle of the cyclone is large, a smooth curved surface can be obtained to achieve a good blending effect.

Description

Nozzles with flared profile swirlers

technical field

The invention belongs to the technical field of combustion devices, and relates to a nozzle with a dilated profile swirler.

Background technique

Gas turbines are widely used in electric power, aviation, petrochemical and other industries due to their small size and high output power. Due to the energy crisis and environmental degradation, the development of efficient and clean combustion chambers is urgently required, and the combustion chambers are required to have the characteristics of reliable ignition, stable combustion, high efficiency and low emissions. At present, the problem of environmental pollution in my country is very serious, so it is very urgent to develop clean combustion technology for gas turbines.

At present, gas turbine manufacturers have developed a variety of clean combustion technologies, such as lean premixed combustion technology, dilute phase premixed preevaporation technology, lean direct injection technology, and catalytic combustion technology, etc. Although these technologies can effectively reduce pollutant emissions, but All face the problem of unstable combustion, and this burner has a complex structure and many parts.

Injection devices, such as nozzles, are important components of gas turbines, and their performance largely determines the efficiency, safety and stability of combustion. As the core component of the injection device, the structure of the swirler has a great influence on the flow direction of the fluid and the mixing effect, which in turn has a great influence on the combustion. The existing swirler does not perform well in the mixing effect, and The structure is complex, so it is urgent to propose a cyclone structure that can improve the mixing effect and has a simple structure.

SUMMARY OF THE INVENTION

(1) Technical problems to be solved

The present disclosure provides a nozzle with a flared profile swirler to at least partially solve the technical problems raised above.

(2) Technical solutions

According to one aspect of the present disclosure, there is provided a nozzle having a swirler with a flared profile, comprising: an inner nozzle wall; an outer nozzle wall; and a swirler sandwiched between the inner nozzle wall and the outer nozzle wall, the profile of which is flared .

In some embodiments of the present disclosure, the downstream section of the swirler and the outer wall of the nozzle is an expanding section; the downstream section of the inner wall of the nozzle is a converging section; the upstream section of the swirler, the inner wall of the nozzle and the outer wall of the nozzle is a straight section; Straight upstream section and flared downstream section.

In some embodiments of the present disclosure, a smooth flow channel is formed between the upstream section of the nozzle inner wall and the upstream section of the nozzle outer wall; and an expanded flow channel is formed between the downstream section of the nozzle inner wall and the downstream section of the nozzle outer wall.

In some embodiments of the present disclosure, the contour line of the expansion section of the cyclone includes: an inner contour line of the cyclone and an outer contour line of the cyclone, and a contour line formed between the inner contour line of the cyclone and the outer contour line of the cyclone The shape of the cyclone is an expansion shape, and the cross-sectional area of the cyclone gradually expands along the downstream direction.

In some embodiments of the present disclosure, the cyclone further includes: at the outlet end of the cyclone, the inner contour line of the cyclone and the outer contour line of the cyclone are straight segment contour lines, and the straight segment contour line The length satisfies: between 1% and 10% of the height of the cyclone.

In some embodiments of the present disclosure, the length of the straight segment profile is 5% of the cyclone height.

In some embodiments of the present disclosure, the nozzle with a flared profile swirler further comprises: an intermediate cylinder inserted into the swirler, and radially dividing the vanes of the swirler into two parts, an inner ring and an outer ring; Therein, the fluids of the inner ring of the cyclone enter the intermediate cylinder and are mixed with each other.

In some embodiments of the present disclosure, the contour line of the intermediate cylinder is the contour line of the intermediate cylinder, the contour line of the intermediate cylinder is a convergent shape, and an intermediate circle is formed between the contour line of the intermediate cylinder and the outer contour line of the cyclone The expansion-shaped flow channel between the cylinder and the outer contour of the cyclone, and the shape of the expansion-shaped flow channel between the middle cylinder and the outer contour of the cyclone is an expansion shape.

In some embodiments of the present disclosure, the nozzle with the dilated profile cyclone further comprises: a mesh plate, disposed at the outlet of the intermediate cylinder, the axial direction of the holes on the mesh plate is the same as that of the swirling plate. The axial direction of the flow device is parallel.

In some embodiments of the present disclosure, the contour of the cyclone satisfies: the shapes of the inlet and outlet curves located at the same circumferential position in a space period are as follows: the inlet cross-sectional curve is circular arc, and the outlet cross-sectional curve is a "ji" shape .

(3) Beneficial effects

It can be seen from the above technical solutions that the nozzle with the expanded profile cyclone provided by the present disclosure has the following beneficial effects:

The contour line of the axial section of the swirler blade is set to expand, the flow channel between the nozzle outer wall and the nozzle inner wall of the cyclone is also set to expand, and the flow channel between the nozzle outer wall and the middle cylinder is also set For the expansion shape, the above expansion channel enhances the mixing effect of the fluid on the inner and outer sides of the cyclone. At the same time, when the torsion angle of the cyclone is large, a smooth curved surface can be obtained to achieve a good mixing effect.

Description of drawings

1 is a half cross-sectional view of a nozzle having a flared profile swirler in accordance with an embodiment of the present disclosure.

FIG. 2 is a schematic diagram of an external outline structure of an expanded shape of a cyclone according to an embodiment of the present disclosure.

FIG. 3 is a schematic diagram of a working process of a cyclone having a flared profile according to an embodiment of the present disclosure.

4 is a flow diagram of a method of generating a nozzle with a flared profile swirler according to an embodiment of the present disclosure.

5A-5E are schematic diagrams of a process for generating a cyclone surface with a flared profile according to an embodiment of the present disclosure.

FIG. 5A is a schematic diagram of forming a straight curved surface by one cycle of inlet cross-sectional curves and outlet cross-sectional curves according to an embodiment of the present disclosure.

5B is a schematic diagram of a cross-sectional curved surface obtained by intercepting the straight curved surface through several 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.

5C is a schematic diagram of a twist curve obtained by rotating the cross-sectional curve shown in FIG. 5B together with 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 connecting the torsion curves shown in FIG. 5C into a curved surface to obtain a curved surface of a period of the cyclone according to an embodiment of the present disclosure.

FIG. 5E is a schematic diagram of obtaining a curved surface of a cyclone by arraying one period curved surface of the cyclone shown in FIG. 5D along a circumferential direction according to an embodiment of the present disclosure.

6 is a schematic perspective view of the structure of a nozzle with a flared profile cyclone with an intermediate cylinder according to an embodiment of the present disclosure.

FIG. 6A is a schematic diagram of a dilated channel formed between the outline of the middle cylinder of the cyclone structure shown in FIG. 6 and the outline of the cyclone according to an embodiment of the present disclosure.

6B is a schematic diagram of disposing a mesh plate at the outlet of the middle cylinder of the cyclone structure shown in FIG. 6 according to an embodiment of the present disclosure.

FIG. 7 is a schematic structural diagram of a cyclone with an outlet contour line of a straight section, compared with the cyclone shown in FIG. 2 , according to an embodiment of the present disclosure.

【Symbol Description】

110 - cyclone;

111-inside fluid inlet of cyclone; 112-outside fluid inlet of cyclone;

120 - nozzle inlet;

121 - the inner wall of the nozzle; 122 - the outer wall of the nozzle;

123 - nozzle outlet;

130-straight flow channel at the nozzle inlet; 133-expanded flow channel at the nozzle outlet;

210- the inner contour of the cyclone; 220- the outer contour of the cyclone;

231 - Expanded runner of the cyclone;

310 - the radial movement of the fluid outside the cyclone;

320 - the radial movement of the fluid inside the cyclone;

401 - The inlet section curve of a periodic straight surface of the cyclone;

400-straight surface;

402 - The outlet section curve of a periodic straight surface of the cyclone;

411- the first section curve of the straight surface; 412- the second section curve of the straight surface;

413 - the third section curve of the straight surface;

421-The curve of the first section curve of the straight surface after rotation;

422-The curve of the second section curve of the straight surface after rotation;

423 - the rotated curve of the third section curve of the straight surface;

424 - the rotated curve of the exit section curve of the straight surface;

500-intermediate cylinder; 510-intermediate cylinder outline;

511-mesh plate;

521-Expansion-shaped flow channel between the middle cylinder and the outer contour of the cyclone;

610 - Outline of the straight outlet of the cyclone;

620 - Straight Outlet Outline Inside Cyclone.

Detailed ways

The present disclosure provides a nozzle with a swirler with an expanded profile, the contour line of the axial section of the vane of the swirler is set to be expanded, and the flow channel between the outer wall of the nozzle 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 above expansion-shaped flow channel enhances the mixing effect of the fluid on both sides of the cyclone. At the same time, when the twist angle of the cyclone is large, A smooth surface is also obtained for a good blending effect.

In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the specific embodiments and the accompanying drawings.

A first embodiment of the present disclosure provides a nozzle having a flared profile swirler.

FIG. 1 is a half-section view of a nozzle having a swirler with an expanded profile according to an embodiment of the present disclosure; FIG. 2 is a schematic view of the structure of the expanded outline of a swirler according to an embodiment of the present disclosure. 1 and FIG. 2 , the nozzle with a swirler with an expanded profile of the present disclosure includes: a swirler 110 ; a nozzle inner wall 121 , which is disposed inside the swirler 110 ; The downstream section of the swirler 110 and the nozzle outer wall 122 is the expansion section, the downstream section of the nozzle inner wall 121 is the converging section, the swirler 110, the nozzle inner wall 121 and the upstream section of the nozzle outer wall 122 are the straight sections, and the nozzle as a whole forms a straight section A shaped upstream section and a flared downstream section.

Nozzle inlet 120 and nozzle outlet 123 The nozzle inlet 120 includes: the fluid inlet 111 inside the cyclone, formed between the upstream section of the inner wall 121 of the nozzle and the upstream section of the cyclone 110; the fluid inlet 112 outside the cyclone, formed in the nozzle Between the upstream section of the outer wall 122 and the upstream section of the cyclone 110; the straight flow channel 130 of the nozzle inlet is formed between the upstream section of the nozzle inner wall 121 and the upstream section of the nozzle outer wall 122; and the expansion-shaped flow channel 133 of the nozzle outlet is formed in between the downstream section of the nozzle inner wall 121 and the downstream section of the nozzle outer wall 122;

The nozzle inlet 120 is arranged at the fluid inlet, including: the inner fluid inlet 111 of the cyclone, formed between the inner wall 121 of the nozzle and the inner wall surface of the cyclone 110; the outer fluid inlet 112 of the cyclone, formed between the outer wall 122 of the nozzle and the inner wall surface of the cyclone 110 Between the outer side walls of the swirler 110; the nozzle outlet 123 is arranged at the fluid outlet; the straight flow channel 130 of the nozzle inlet is arranged between the nozzle inner wall 121 and the nozzle outer wall 122, at the nozzle inlet 120; The expanding flow channel 133 is disposed between the inner wall 121 of the nozzle and the outer wall 122 of the nozzle, and is located at the outlet 123 of the nozzle.

The various components of the nozzle with the diverging profile swirler of this embodiment will be described below.

In this embodiment, the cyclone 110 has an expanded outline. Referring to FIG. 2 , the expanded outline means: between the cyclone inner contour line 210 and the cyclone outer contour line 220 of the cyclone 110 The formed shape is an expansion shape, and the cross-sectional area at the corresponding nozzle outlet 123 is greater than the cross-sectional area at the nozzle inlet 120; wherein, the inner contour line 210 of the cyclone is the tangent of the inner side wall surface of the cyclone 110; the outer contour line of the cyclone 220 is a tangent to the outer side wall surface of the cyclone 110 .

In this embodiment, the inner fluid inlet 111 of the cyclone is annular, and the outer fluid inlet 112 of the cyclone is also annular.

In this embodiment, an expansion-shaped flow channel is also formed between the inner contour line 210 of the cyclone and the outer contour line 220 of the cyclone, and is arranged in the expansion-shaped flow channel formed by the nozzle inner wall 121 and the nozzle outer wall 122 .

The cyclone sections corresponding to the nozzle inlet 120 and the nozzle outlet 123 are different in size, and the cross-sectional area corresponding to the nozzle outlet 123 is larger than that of the nozzle inlet 120, so an expanded flow channel 133 of the nozzle outlet will be formed at the nozzle outlet.

The working process of the cyclone having the expanded profile of this embodiment will be described below.

FIG. 3 is a schematic diagram of a working process of a cyclone having a flared profile according to an embodiment of the present disclosure. Referring to Fig. 3, while the fluid moves axially in the cyclone, it also moves in the radial direction. The radial motion 310 of the fluid outside the cyclone is directed towards the center of the circle; the radial movement of the fluid inside the cyclone The direction of the movement 320 is away from the center of the circle. It can be seen that the radial movement directions of the fluids on the adjacent inner and outer sides of the cyclone are opposite. This strong shearing motion can enhance the flow of the fluids on both sides of the cyclone at the nozzle outlet Therefore, the flow channel between the inner contour line 210 of the cyclone and the outer contour line 220 of the cyclone must be set to be expanded, so as to maintain this strong shearing motion in the radial direction; if the swirling flow The flow channel between the inner and outer contour lines of the cyclone is straight or convergent, which will not form the radial motion of the fluid inside and outside the cyclone, so it cannot form a strong radial shear motion, which is not conducive to the cyclone. The mixing of the fluid inside and outside the flow device at the nozzle outlet. Therefore, the cyclone of the present disclosure adopts the structure of the flared profile.

In a second embodiment of the present disclosure, a method of generating a nozzle with a flared profile swirler as shown in the first embodiment is provided.

4 is a flow diagram of a method of generating a nozzle with a flared profile swirler according to an embodiment of the present disclosure. As depicted in FIG. 4 , a method of disclosing a nozzle having a flared profile cyclone includes:

Step S402: obtaining a straight curved surface through inlet and outlet curves located at the same circumferential position within a space period, and then obtaining a cyclone cross-sectional curve on the straight curved surface;

In this embodiment, the shapes of the inlet and outlet curves located at the same circumferential position in one space cycle satisfy: the inlet cross-sectional curve is circular arc, and the outlet cross-sectional curve is a "ji" shape; the inlet and outlet curves can directly form a straight curved surface, this In the embodiment, the method for obtaining the cross-section curve of the cyclone on the straight curved surface is preferably as follows: intercepting the straight curved surface with a plane that is equally spaced and perpendicular to the axial direction to obtain the cross-sectional curve of the cyclone;

Step S404: twist the cyclone cross-sectional curves at different positions to obtain the rotated cyclone cross-sectional curves;

In this embodiment, it is preferable that the torsion angle gradually increases along the downstream direction according to the law of linear distribution; the distribution law satisfies: the torsion angle of the cyclone cross-section curve at different positions is: H*/H×E, where H is the rotation The axial height of the cyclone, E is the twist angle of the cyclone, and H* is the axial height of the cyclone section curve at different positions;

Step S406: forming a curved surface by using the rotated cross-sectional curve of the cyclone to obtain a curved surface of a period of the cyclone;

Step S408: Array the curved surface of a period of the cyclone along the circumferential direction to obtain the curved surface of the cyclone.

5A-5E are schematic diagrams of a process for generating a cyclone surface with a flared profile according to an embodiment of the present disclosure. FIG. 5A is a schematic diagram of forming a straight curved surface by one cycle of inlet cross-sectional curves and outlet cross-sectional curves according to an embodiment of the present disclosure. 5B is a schematic diagram of a cross-sectional curved surface obtained by intercepting the straight curved surface through several 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. 5C is a schematic diagram of a twist curve obtained by rotating the cross-sectional curve shown in FIG. 5B together with 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 connecting the torsion curves shown in FIG. 5C into a curved surface to obtain a curved surface of a period of the cyclone according to an embodiment of the present disclosure. FIG. 5E is a schematic diagram of obtaining a curved surface of a cyclone by arraying one period curved surface of the cyclone shown in FIG. 5D along a circumferential direction according to an embodiment of the present disclosure.

Please refer to FIG. 5A to FIG. 5E to describe the method of generating the cyclone.

Referring to FIG. 5A , the inlet cross-sectional curve 401 of a periodic straight surface of the cyclone and the outlet cross-sectional curve 402 of a periodic straight curved surface of the cyclone are in the same circumferential position, and the inlet cross-sectional curve 401 of a periodic straight surface of the cyclone is a circle Arc-shaped, the outlet cross-section curve 402 of a periodic straight curved surface of the cyclone is a “ji” shape, and a straight curved surface 400 can be formed by these two curves; , and 3/4 of the axial position, make three equally spaced and vertical planes to intercept the straight surface 400, and obtain three cross-sectional curves at different axial positions of the straight surface 400—the first cross-sectional curve 411 of the straight surface, The second section curve 412 of the straight surface and the third section curve 413 of the straight surface; please refer to FIG. 5C , rotate these three section curves together with the outlet section curve 402 of a periodic straight surface of the cyclone by a certain angle in the circumferential direction, preferably rotating The angles are distributed linearly along the axial direction. For example, in this embodiment, the rotation angle of the cyclone is 120°, then the rotation angle of the first cross-section curve 411 of the straight surface is 30°, and the second cross-section curve 412 of the straight surface is 30°. The rotation angle is 60°, the rotation angle of the third section curve 413 of the straight surface is 90°, and the rotation angle of the outlet section curve 402 of a periodic straight surface of the cyclone is 120°, thus obtaining four curves—the first straight surface Rotated curve 421 of one section curve, rotated curve 422 of the second section curve of straight surface, rotated curve 423 of the third section curve of straight surface, and rotated curve 424 of the exit section curve of straight surface; please refer to In Fig. 5D, the curved surface of the cyclone 110 is obtained by making the curved surfaces 421, 422, 423 and 424; please refer to Fig. 5E, the curved surface of the cyclone 110 is obtained by arraying a periodic curved surface of the cyclone along the circumferential direction . Using this method, when the twist angle of the cyclone is large, a smooth curved surface can also be obtained. For example, in this embodiment, the twist angle of the cyclone is 120°, and a smooth curved surface can be obtained by this method. Preferably, the torsion law of the cross-sectional curves of the cyclone at different axial positions conforms to a linear distribution—the twist angle of the cross-sectional curves of the cyclone at different positions is H*/H×E, where H is the axial height of the cyclone , E is the torsion angle of the cyclone, and H* is the axial height of the cyclone section curve at different positions.

A third embodiment of the present disclosure provides a nozzle having a flared profile swirler. For the purpose of brief description, any description of technical features in any of the above embodiments that can be used in the same application is incorporated herein, and there is no need to repeat the same description.

6 is a schematic perspective view of the structure of a nozzle with a flared profile cyclone with an intermediate cylinder according to an embodiment of the present disclosure. Comparing FIGS. 1 , 5E and 6 , compared with the first embodiment, the nozzle with the expanded profile cyclone in the third embodiment of the present disclosure is different in that the structure of the intermediate cylinder 500 is added, and the The outlet of the intermediate cylinder 500 is provided with a mesh plate 511 .

Next, a third embodiment of a nozzle with a flared profile swirler will be described.

Referring to FIG. 6 , insert the middle cylinder 500 into the vanes of the swirler 110, and in the radial direction, the vanes of the swirler 110 are divided into two parts: an inner ring and an outer ring, and the fluid in the inner ring of the swirler 110 enters the middle circle cylinders and mixed with each other.

Referring to FIG. 5A , the contour line 510 of the middle cylinder is in a convergent shape, so that an expanded flow channel 521 between the middle cylinder and the outer contour line of the cyclone is formed between the contour line 510 of the middle cylinder and the outer contour line 220 of the cyclone. This structure can ensure the strong shearing motion of the fluid in the outer ring of the cyclone 500 in the radial direction, and enhance the mixing of the fluid inside and outside the cyclone at the nozzle outlet 123 .

5B, a mesh plate 511 is also provided at the outlet of the intermediate cylinder 500. The axial direction of the holes on the mesh plate 511 is parallel to the axial direction of the nozzle. This structure can keep the fluid at the outlet of the intermediate cylinder 500 in the axial direction. The fluid in the periphery of the intermediate cylinder 500 performs a rotational movement, which can improve the tempering margin of the nozzle.

A fourth embodiment of the present disclosure provides a nozzle having a flared profile swirler. For the purpose of brief description, any description of technical features in any of the above embodiments that can be used in the same application is incorporated herein, and there is no need to repeat the same description.

FIG. 7 is a schematic structural diagram of a cyclone with an outlet contour line of a straight section, compared with the cyclone shown in FIG. 2 , according to an embodiment of the present disclosure. Comparing FIG. 2 and FIG. 7 , the fourth embodiment of the present disclosure has a nozzle with a dilated profile swirler, which is different from the first embodiment in that in this embodiment, the swirler 110 is also located at the nozzle outlet 123 . There is a straight exit outline.

Please refer to FIG. 7 , the cyclone 110 has a straight outlet contour line, and a straight flow channel is formed between the straight outlet contour line 610 outside the cyclone and the straight outlet contour line 620 inside the cyclone. The swirl intensity can be increased, but the length of the straight section cannot be too large, otherwise the fluid will not be able to form a strong radial shear motion at the nozzle outlet, which is not conducive to the mixing of the fluid on both sides of the cyclone. is anywhere from 1% to 10% of the cyclone height (including the endpoints), preferably 5% of the cyclone height.

It should be noted that, in the accompanying drawings or the text of the description, the implementations that are not shown or described are in the form known to those of ordinary skill in the technical field, and are not described in detail. In addition, the above definitions of each component are not limited to the various specific structures and shapes mentioned in the embodiments, and those of ordinary skill in the art can simply modify or replace them, for example:

(1) The cyclone and nozzle structure can also adopt other structures, as long as they can complete the same function;

(2) Demonstrations of parameters including specific values may be provided herein, but these parameters need not be exactly equal to the corresponding values, but may be approximated within acceptable error tolerances or design constraints;

(3) The directional terms mentioned in the embodiment, such as "up", "down", "front", "rear", "left", "right", etc., are only for referring to the directions of the drawings, not for limiting The protection scope of the present invention;

(4) The above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

To sum up, the present disclosure provides a nozzle with a swirler with an expanded profile. The profile of the axial cross-section of the vanes of the swirler is set to be expanded, and the flow passage between the outer wall of the nozzle and the inner wall of the nozzle is set. It is also set to be expanded, and the flow channel between the outer wall of the nozzle and the middle cylinder is also set to be expanded. The structure of the expansion channel above enhances the mixing effect of the fluids on the inside and outside of the cyclone. When the torsion angle of the cyclone is large, a smooth curved surface can also be obtained to achieve a good mixing effect; and an intermediate cylinder can be added and a straight section can be set at the outlet of the cyclone to increase the cyclone strength; The cyclone generation method is used to generate a nozzle with a dilated profile cyclone. The method is generalizable and the generated structure is simple.

Similarly, it will be appreciated that in the above description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together into a single embodiment, figure, or its description. However, this method of disclosure should not be interpreted as reflecting an intention that 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 the present disclosure.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present disclosure in detail. It should be understood that the above-mentioned specific embodiments are only specific embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included within the protection scope of the present disclosure.

Claims (7)

1. A nozzle with a flared profile cyclone comprising: The inner wall of the nozzle; the outer wall of the nozzle; and The cyclone is sandwiched between the inner wall of the nozzle and the outer wall of the nozzle, and its outline is an expanding shape; The middle cylinder is inserted into the cyclone, and in the radial direction, the blades of the cyclone are divided into two parts, an inner ring and an outer ring; Wherein, the fluid in the inner ring of the cyclone enters the intermediate cylinder and mixes with each other; the contour line of the intermediate cylinder is the contour line of the intermediate cylinder, the contour line of the intermediate cylinder is a convergent shape, the intermediate An expanded flow channel between the middle cylinder and the outer contour of the cyclone is formed between the contour line of the cylinder and the outer contour of the cyclone, and the shape of the expanded flow channel between the middle cylinder and the outer contour of the cyclone is: expansion; At the outlet end of the cyclone, the inner contour line of the cyclone and the outer contour line of the cyclone are straight section contour lines, and the length of the straight section contour line satisfies: between 1% and 10% of the height of the cyclone. %between. 2. The nozzle with a flared profile swirler of claim 1, wherein: The downstream section of the cyclone and the outer wall of the nozzle is an expansion section; The downstream section of the inner wall of the nozzle is a converging 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 flared downstream section. 3. The nozzle with a flared profile swirler of claim 2, wherein: forming a smooth flow channel between the upstream section of the inner wall of the nozzle and the upstream section of the outer wall of the nozzle; A dilated flow channel is formed between the downstream section of the inner wall of the nozzle and the downstream section of the outer wall of the nozzle. 4. The nozzle with a flared profile swirler of claim 2, wherein the profile of the flared section of the swirler comprises: The inner contour line of the cyclone and the outer contour line of the cyclone, the shape formed between the inner contour line of the cyclone and the outer contour line of the cyclone is an expansion shape, and the cross-sectional area of the cyclone in the downstream direction gradually increases. expand. 5. The nozzle with a flared profile swirler of claim 1, wherein the length of the straight segment profile is 5% of the height of the swirler. 6. The nozzle with a flared profile swirler of claim 1, further comprising: The mesh plate is arranged at the outlet of the intermediate cylinder, and the axial direction of the holes on the mesh plate is parallel to the axial direction of the cyclone. 7. The nozzle with a dilated profile swirler according to any one of claims 1 to 6, wherein the inlet cross-sectional curve of the swirler at the same circumferential position is a circular arc, and the outlet cross-sectional curve is " a few" shape.

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