CN115597086B - nozzle - Google Patents

Abstract

One aspect of an embodiment of the present disclosure provides a nozzle, comprising: a body configured as a tubular structure, an interior of the body defining a first flow passage and an exterior of the body defining a second flow passage; and a plurality of plasma exciters uniformly arranged along the circumferential direction of the outlet end of the body, wherein the induced flow directions of the adjacent two plasma exciters on the fluid are opposite, so that the first fluid passing through the first flow channel and the second fluid passing through the second flow channel are mixed. The mixing degree of the fluid passing through the outlet end of the nozzle is promoted by controlling the induced flow direction of the fluid through the plasma exciter, so that the mixing effect of the fluid is more sufficient.

Description

nozzle

Technical Field

The present disclosure relates to the technical field of combustion devices, and more particularly, to a nozzle suitable for a gas turbine.

Background technique

Gas turbines are widely used in power, aviation, petrochemical and other industries due to their small size and high output power. With the development of technology, the combustion chamber of existing gas turbines must not only meet technical requirements such as reliable ignition, stable combustion, and high combustion efficiency, but low emissions have also become an important technical requirement.

In response to the increasingly stringent requirements for low emissions, various manufacturers have developed a variety of clean combustion technologies (such as lean premixed combustion technology, dilute phase premixed preevaporation technology, lean oil direct injection technology, and catalytic combustion technology, etc.). Although these technologies can effectively reduce pollutant emissions, they all face the problem of unstable combustion.

In order to improve the thermoacoustic instability of combustion, improve the combustion efficiency of the burner, enhance the combustion stability and reduce pollutant emissions, it is necessary to regulate the mixing between fuel and air. Commonly used design methods such as injection holes have disadvantages such as insufficient mixing, long mixing distance and large flow loss.

Summary of the invention

In order to solve at least one of the above-mentioned and other technical problems in the prior art, the present invention provides a nozzle suitable for a gas turbine, which controls the induced flow direction of the fluid through a plasma exciter and promotes the mixing degree of the fluid passing through the outlet end of the nozzle, so that the mixing effect of the fluid is more sufficient.

One aspect of an embodiment of the present disclosure provides a nozzle, comprising: a body, which is configured as a tubular structure, wherein the interior of the body defines a first flow channel, and the exterior of the body defines a second flow channel; and a plurality of plasma actuators, which are evenly arranged in a circumferential direction along the outlet end of the body, and wherein two adjacent plasma actuators induce opposite flow directions of the fluid to mix a first fluid passing through the first flow channel and a second fluid passing through the second flow channel.

In an exemplary embodiment, the excitation voltage of at least a portion of the plasma actuators is configured to be adjustable to adjust the excitation intensity of the plasma actuators, so that the mixing degree of the first fluid and the second fluid with the air is adjustable.

In an illustrative embodiment, the plasma exciter includes: a first electrode, arranged on the outlet end; an insulating medium, covering at least a portion of the first electrode; and a second electrode, arranged on the insulating medium and isolated from the first electrode; wherein the first electrode is electrically connected to a ground terminal of a plasma generator, and the second electrode is electrically connected to a high voltage terminal of the plasma generator.

In an illustrative embodiment, the second electrodes of two adjacent plasma actuators are staggered along the radial direction of the body and installed on the insulating medium, one of the second electrodes is configured to be close to the inner wall surface of the outlet end, and the other is configured to be close to the outer wall surface of the outlet end.

In an exemplary embodiment, a plurality of the plasma actuators share one insulating medium, and the insulating medium covers at least a portion of each of the first electrodes.

In an illustrative embodiment, it further comprises a partition plate made of insulating material, which is disposed on the insulating medium between the second electrodes of two adjacent plasma actuators to isolate the two adjacent second electrodes.

In an illustrative embodiment, the insulated second electrode is configured to rotate around the axis of the body, and is suitable for adjusting the relative position of the second electrode with respect to the first electrode to adjust the induced flow direction of the fluid by the formed plasma.

In an exemplary embodiment, the outlet end is configured as a planar structure extending in a radial direction with respect to the body.

In an illustrative embodiment, a plurality of first electrodes of the plasma actuators are mounted on the axial end surface of the outlet end at uniform intervals along the circumferential direction.

In an illustrative embodiment, the first electrode is configured as a fan-shaped structure.

In an illustrative embodiment, the end of the first electrode facing the inner wall surface or the outer wall surface of the outlet end is configured as a bent portion, which is exposed to the outside of the insulating medium and extends along the axial direction of the body.

In an illustrative embodiment, a plurality of the plasma actuators share one first electrode, and the first electrode is mounted on an axial end surface of the outlet end.

In an illustrative embodiment, the first electrode is configured as a ring structure.

In an illustrative embodiment, the second electrode is mounted on a surface of the insulating medium facing away from the first electrode, and in a projection in the axial direction of the body, the first electrode covers the second electrode.

In an illustrative embodiment, the second electrode is mounted on a surface of the insulating medium between a surface facing the first electrode and a surface facing away from the first electrode.

In an illustrative embodiment, the inner wall surface and the inner wall surface of the insulating medium are both chamfered so that the outlet end is configured as a sharp portion.

In an illustrative embodiment, the main body is made of an insulating material, and the sharp portion serves as the insulating medium.

In an illustrative embodiment, the first electrodes of two adjacent plasma actuators are staggered, one is substantially parallel to the extension direction of the inner wall surface, and the other is substantially parallel to the extension direction of the outer wall surface.

In an illustrative embodiment, the second electrodes of two adjacent plasma actuators are staggered, one second electrode is arranged on the inner wall surface, and the other second electrode is arranged on the extension, each second electrode corresponds to the position of a first electrode and is roughly parallel to the extension direction of the corresponding first electrode.

In an illustrative embodiment, the first electrode is configured as an annular structure and is disposed within the sharp portion along an extension direction that is substantially the same as the axial direction of the body.

In an illustrative embodiment, a plurality of third electrodes are further included, each of the third electrodes is disposed on a side of the inner wall surface between two adjacent second electrodes away from the second electrode, and the third electrode is electrically connected to the high voltage end of the plasma generator.

According to the nozzle provided by the present disclosure, the plasma actuator is used to induce the fluid to flow, so that the first fluid and the second fluid are offset from the mainstream velocity direction of the first flow channel or the second flow channel when passing through the outlet end under the action of the plasma actuator, so as to increase the contact area between the first fluid and the second fluid. The two adjacent plasma actuators induce the flow of the fluid in opposite directions, so that shear force can be formed between the fluids induced by different plasma actuators, and a vortex structure can be formed in the process of downstream development, which is conducive to more sufficient mixing of the first fluid and the second fluid.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective view of a nozzle according to an exemplary embodiment of the present disclosure;

FIG2 is a schematic diagram of the plasma actuator induced flow direction of the fluid in the exemplary embodiment shown in FIG1;

FIG3 is a schematic diagram of the mainstream velocity direction of the first fluid and the second fluid after being induced in the exemplary embodiment shown in FIG2 ;

FIG4 schematically shows a perspective view of an embodiment of a nozzle provided with a baffle;

FIG5 schematically shows a perspective view of an embodiment of a nozzle in which the second electrode is configured to rotate about the axis of the body;

FIG6 schematically shows a perspective view of an embodiment in which the first electrode is configured as a nozzle including a bend;

FIG7 schematically shows a perspective view of an embodiment of a nozzle in which the first electrode is configured as an annular structure;

FIG8 schematically shows a perspective view of an embodiment of a nozzle in which the second electrode is disposed on the inner wall surface and the outer wall surface of the insulating medium;

FIG9 schematically shows a three-dimensional view of an embodiment of a nozzle in which the inner wall surface and the outer wall surface of the insulating medium are chamfered; and

FIG. 10 schematically shows a perspective view of an embodiment of a nozzle provided with a third electrode.

In the above drawings, the meanings of the reference numerals are as follows:

1. Body;

11. First flow channel;

12. Second flow channel;

13. Sharp part;

2. Plasma actuator;

21. Insulating medium;

22. a second electrode;

23. a first electrode;

24. Partition;

25. a third electrode;

3. Ion generator;

31. ground terminal; and

32. High voltage end.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and/or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

When using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and/or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and/or A, B, C, etc.

Fig. 1 is a perspective view of a nozzle according to an exemplary embodiment of the present disclosure. Fig. 2 is a schematic diagram of the induced flow direction of a fluid by a plasma actuator according to the exemplary embodiment shown in Fig. 1. Fig. 3 is a schematic diagram of the mainstream velocity direction of the first fluid and the second fluid after being induced according to the exemplary embodiment shown in Fig. 2.

The present disclosure provides a nozzle, as shown in FIGS. 1 to 3 , comprising a body 1 and a plurality of plasma actuators 2. The body 1 is configured as a tubular structure, wherein the interior of the body 1 defines a first flow channel 11, and the exterior of the body 1 defines a second flow channel 12. For example, an annular body is provided at the periphery of the body 1, and the gap between the annular body and the outer wall of the body forms the second flow channel suitable for conveying a second fluid. The plurality of plasma actuators 2 are evenly arranged along the circumferential direction of the outlet end of the body 1, and the induced flow directions of the fluids by two adjacent plasma actuators 2 are opposite, so that the first fluid passing through the first flow channel 11 and the second fluid passing through the second flow channel 12 are mixed.

In an illustrative embodiment, the body 1 is configured as a tubular structure including but not limited to a cylindrical shape.

In detail, one axial end of the body 1 is configured as an inlet end (the lower end as shown in FIG. 1 ) for guiding fluid into the body 1, and the other axial end of the body 1 is configured as an outlet end (the upper end as shown in FIG. 1 ) for guiding fluid out of the body 1. It should be understood that the embodiments of the present disclosure are not limited thereto.

For example, the body 1 is configured to be cylindrical, truncated cone, polygonal or other tubular structures suitable for guiding the passage of fluid.

In an illustrative embodiment, the interior of the main body 1 defines a first flow channel 11 suitable for guiding the passage of a first fluid, and the exterior of the main body 1 defines a second flow channel 12 suitable for guiding the passage of a second fluid (the second flow channel 12 includes but is not limited to the area between an annular body (not shown in the figure) sleeved on the outside of the main body 1 and the main body 1).

In detail, the first fluid in the first flow channel 11 flows from the inlet end to the outlet end along the axial direction of the main body 1 (direction b as shown in Figure 2), and the mainstream velocity direction of the second fluid in the second flow channel 12 (direction a as shown in Figure 2) is roughly the same as the mainstream velocity direction of the first fluid.

Furthermore, the flow rate of the first fluid and the flow rate of the second fluid can be set according to actual mixing requirements, and the flow rates of the first fluid and the second fluid can be the same or different.

In an exemplary embodiment, the plurality of plasma actuators 2 is represented by an even number of four or more.

In detail, each plasma actuator 2 is evenly arranged on the body 1 , so that the flow direction induced by the plasma actuator 2 on the fluid is substantially the radial direction of the body 1 .

In such an embodiment, as shown in FIG. 2 and FIG. 3 , each plasma actuator 2 induces the flow of the fluid passing through the plasma actuator 2, so that the first fluid and the second fluid are offset from the mainstream velocity direction of the first flow channel 11 or the second flow channel 12 when passing through the outlet end under the action of the plasma actuator 2 (directions a and b as shown in FIG. 2 become directions a1, a2, b1 and b2), so as to increase the contact area between the first fluid and the second fluid. The induced flow directions of the fluids by two adjacent plasma actuators 2 are opposite, so that shear forces can be formed between the fluids induced by different plasma actuators 2, and a vortex structure can be formed in the process of downstream development, which is conducive to more sufficient mixing of the first fluid and the second fluid.

According to an embodiment of the present disclosure, as shown in FIGS. 1 to 3 , the excitation voltage of at least a portion of the plasma exciter 2 is configured to be adjustable, and is suitable for adjusting the excitation intensity of the plasma exciter 2 so that the mixing degree of the first fluid and the second fluid with the air is adjustable.

In an illustrative embodiment, as shown in FIG1 , a plasma generator 3 is also included.

In detail, the plasma generator 3 is adapted to adjust the excitation voltage of each plasma actuator 2. It should be understood that the embodiments of the present disclosure are not limited thereto.

For example, the plasma generator 3 may be adapted to adjust the excitation voltage of a portion (including but not limited to several spaced apart or several adjacent in a certain area) of the plasma exciters 2 .

In such an embodiment, the excitation voltage of the plasma exciter 2 is adjusted by the plasma generator to adjust the excitation intensity of the plasma exciter 2. In this way, by regulating the mixing degree of the first fluid and the second fluid with the air, the unstable combustion phenomenon (such as the thermoacoustic instability of the combustion) caused by insufficient mixing can be dynamically adjusted.

According to an embodiment of the present disclosure, as shown in FIGS. 1 to 3 , the plasma exciter 2 includes a first electrode 23, an insulating medium 21, and a second electrode 22. The first electrode 23 is disposed on the outlet end. The insulating medium 21 covers at least a portion of the first electrode 23. The second electrode 22 is disposed on the insulating medium 21 and isolated from the first electrode 23. The first electrode 23 is electrically connected to a ground terminal 31 of a plasma generator 3, and the second electrode 22 is electrically connected to a high voltage terminal 32 of the plasma generator 3.

According to an embodiment of the present disclosure, as shown in Figures 1 to 3, the second electrodes 22 of two adjacent plasma actuators 2 are staggered along the radial direction of the main body 1 and installed on the insulating medium 21, and one second electrode 22 is configured to be close to the inner wall surface of the outlet end, and the other is configured to be close to the outer wall surface of the outlet end.

In an illustrative embodiment, the inner wall surface near the outlet end is characterized as being located inside a circle with a radius from the midpoint of the thickness direction of the body 1 to the axis of the body 1, and the outer wall surface near the outlet end is characterized as being located outside the circle.

In detail, the plurality of first electrodes 23 are configured to be symmetrical about the axis of the body 1 .

Furthermore, the plurality of second electrodes 22 are configured to be symmetrical about the axis of the body 1 .

In such an embodiment, two adjacent plasma actuators 2 can form opposite induced flow directions for the fluid through the staggered second electrodes, and since the multiple first electrodes 23 and the multiple second electrodes 22 are constructed into a circularly symmetrical structure, the induction effects of the two plasma actuators 2 with the same induced flow direction for the fluid should be roughly the same, which is beneficial to controlling the mixing degree of the fluid.

According to an embodiment of the present disclosure, as shown in FIG. 1 to FIG. 3 , a plurality of plasma actuators 2 share an insulating medium 21 , and the insulating medium 21 covers at least a portion of each first electrode 23 .

In an exemplary embodiment, the insulating medium 21 covers each first electrode 23 .

In another exemplary embodiment, the insulating medium 21 covers a portion of the first electrode 23 , so that another portion of the first electrode 23 is exposed to the outside of the insulating medium 21 and isolated from the second electrode 22 .

In such an embodiment, a plurality of plasma actuators 2 share one insulating medium 21, which is beneficial to simplifying the structure of the nozzle and reducing the difficulty of manufacturing and assembling.

FIG. 4 is a perspective view of a nozzle according to another exemplary embodiment of the present disclosure.

According to an embodiment of the present disclosure, as shown in FIG. 4 , the nozzle further includes a partition plate 24 made of insulating material, which is disposed on the insulating medium 21 between the second electrodes 22 of two adjacent plasma actuators 2 to isolate the two adjacent second electrodes 22 .

In an exemplary embodiment, the partition 24 may be made of, including but not limited to, the same material as the insulating medium 21 .

In an illustrative embodiment, the partition 24 is configured as a fan-shaped structure.

In detail, the separator 24 is disposed between two adjacent second electrodes 22 .

Furthermore, both ends of the separator 24 are respectively attached to the ends of the second electrode 22 facing each other.

In an exemplary embodiment, the partition 24 is installed on the insulating medium 21 .

In another exemplary embodiment, the partition 24 is integrally formed on the insulating medium 21 .

In detail, a groove-shaped portion is formed between two adjacent separators 24 , and a second electrode 22 is installed in the groove-shaped portion.

In such an embodiment, the partition 24 disposed between the two second electrodes 22 is suitable for isolating the two second electrodes 22 to prevent creepage between the two second electrodes 22, thereby preventing the creepage from weakening the effect of regulating the mixing degree. In addition, since plasma will not be formed in the area where the partition 24 is disposed, an angular vortex motion can be generated in the angle area formed by the partition 24 and the plasma exciter 2, and the vortex formed by the angular vortex motion is helpful to regulate the mixing degree.

FIG. 5 schematically shows a perspective view of an embodiment of a nozzle in which the second electrode is configured to rotate about the axis of the body.

According to an embodiment of the present disclosure, as shown in FIG. 5 , the insulated second electrode 22 is configured to rotate around the axis of the body 1 , and is suitable for adjusting the relative position of the second electrode 22 relative to the first electrode 23 to adjust the induced flow direction of the formed plasma on the fluid.

In an illustrative embodiment, the second electrode 22 is fixed on the insulating medium 21 .

In detail, the insulating medium 21 is configured to be connected to a driving mechanism, and the driving mechanism is suitable for driving the insulating medium 21 and each second electrode 22 to rotate around an axis (in the direction e as shown in FIG. 5 ).

Furthermore, the axis of the body 1 coincides with the axis of the first flow channel 11 and/or the second flow channel 12 .

It should be noted here that the driving mechanism is not the key point of protection of the present disclosure, and any mechanism in the art that can be used to drive the main body 1 to rotate can be selected and applied, and no further elaboration will be given.

In such an embodiment, the gaps between adjacent plasma actuators 2 do not generate plasma, so the position relative to the first electrode 23 can be changed by driving the second electrode 22 to rotate, so that plasma that can induce the fluid is periodically formed in the gap position. In this way, the fluids can be intertwined more closely, and the disturbance effect of the plasma actuator 2 on the first fluid and the second fluid on both sides of the body 1 can be enhanced, which is conducive to more complete mixing between the fluids.

According to an embodiment of the present disclosure, as shown in FIGS. 1 to 5 , the outlet end is configured as a planar structure extending in a radial direction with respect to the body 1 .

According to an embodiment of the present disclosure, as shown in FIG. 1 to FIG. 5 , the first electrodes 23 of a plurality of plasma actuators 2 are installed on the axial end surface of the outlet end at uniform intervals along the circumferential direction.

According to an embodiment of the present disclosure, as shown in FIGS. 1 to 5 , the first electrode 23 is configured in a fan-shaped structure.

In an illustrative embodiment, the body 1 is configured as a cylindrical tubular structure, and the outlet end (the upper end as shown in FIG. 1 ) is configured as a circular ring.

In detail, as shown in FIG. 1 , a plurality of sector-shaped first electrodes 23 are installed on the upper end surface of the outlet end along the circumferential direction of the outlet end.

FIG. 6 schematically shows a perspective view of an embodiment in which the first electrode is configured as a nozzle including a bend.

According to an embodiment of the present disclosure, as shown in FIG. 6 , the end of the first electrode 23 facing the inner wall surface or the outer wall surface of the outlet end is configured as a bent portion, which is exposed to the outside of the insulating medium 21 and extends along the axial direction of the body 1 .

In an illustrative embodiment, the first electrode 23 is configured as a fan-shaped portion of a fan-shaped structure, and a curved end of the fan-shaped portion is integrally provided with a bent portion.

In detail, the bent portion is orthogonal to the fan-shaped portion.

Furthermore, the bending portion corresponds to the position of the second electrode 22 . As shown in FIG. 6 , an arc-shaped end of the first electrode 23 away from the second electrode 22 is integrally provided with the bending portion.

Furthermore, the bent portion extends along the inner wall surface or the outer wall surface of the main body 1 .

In such an embodiment, the bent portion is exposed to the outside of the insulating medium 21, which is suitable for enhancing the induction effect of the plasma actuator 2 on the fluid, so as to optimize the mixing effect of the first fluid and the second fluid on both sides of the nozzle regulated by the plasma actuator 2.

FIG. 7 schematically shows a perspective view of an embodiment of a nozzle in which the first electrode is configured as an annular structure.

According to an embodiment of the present disclosure, as shown in FIG. 7 , a plurality of plasma actuators 2 share a first electrode 23 , and the first electrode 23 is mounted on the axial end surface of the outlet end.

According to an embodiment of the present disclosure, as shown in FIG. 7 , the first electrode 23 is configured as a ring structure.

In an illustrative embodiment, the first electrode 23 is mounted on the upper end surface of the outlet end as shown in FIG. 7 .

Specifically, the width of the first electrode 23 is smaller than the width of the upper end surface of the outlet, and the inner edge and outer edge of the first electrode 23 are both located within the annular region of the projection formed along the axial direction of the outlet. It should be understood that the embodiments of the present disclosure are not limited thereto.

For example, the first electrode 23 may be configured as a substantially annular or arc-shaped irregular structure.

In such an embodiment, a plurality of plasma actuators 2 share one first electrode 23 , which is beneficial to simplifying the structure of the plasma actuator 2 and facilitating assembly with the body 1 and the insulating medium 21 .

According to an embodiment of the present disclosure, as shown in FIGS. 1 to 7 , the second electrode 22 is mounted on a surface of the insulating medium 21 facing away from the first electrode 23 , and in a projection in the axial direction of the body 1 , the first electrode 23 covers the second electrode 22 .

In an illustrative embodiment, the first electrode 23 and/or the second electrode 22 is configured as a fan-shaped structure.

In detail, the width of the second electrode 22 is smaller than the width of the first electrode 23 .

In an exemplary embodiment, the second electrode 22 is installed on the insulating medium 21 in a region covered by a projection of the first electrode 23 of the same plasma actuator 2 along the axial direction of the body 1 .

In detail, the arc length of the second electrode 22 is substantially the same as the arc length of the first electrode 23 .

Furthermore, as shown in FIG. 1 , the first electrode 23 is in close contact with the lower surface of the insulating medium 21 , and the second electrode 22 is installed on the upper surface of the insulating medium 21 .

In such an embodiment, the first electrode 23 and the second electrode 22 are isolated by the insulating medium 21 and have good insulation properties.

FIG8 schematically shows a three-dimensional view of an embodiment of a nozzle in which the second electrode is disposed on the inner wall surface and the outer wall surface of the insulating medium.

According to an embodiment of the present disclosure, as shown in FIG. 8 , the second electrode 22 is installed on a surface of the insulating medium 21 between a surface facing the first electrode 23 and a surface facing away from the first electrode 23 .

In an illustrative embodiment, the insulating medium 21 is configured as an annular structure.

In detail, the width of the insulating medium 21 is the same as the thickness of the body 1 , and the inner wall surface and the outer wall surface of the insulating medium 21 coincide with the inner wall surface and the outer wall surface of the body 1 .

Furthermore, the first electrode 23 is configured as a fan-shaped structure, and the second electrode 22 is configured as a strip-shaped structure with an arc.

Furthermore, the insulating medium 21 covers each first electrode 23, and the adjacent second electrodes 22 are staggered on the inner wall and outer wall of the insulating medium 21, and the arc length of the second electrode 22 is the same as the arc length of the arc end of the fan-shaped structure of the facing first electrode 23.

In such an embodiment, the second electrode 22 is disposed on the inner wall surface or the outer wall surface, which can enhance the intensity of the induced flow of the fluid by the plasma actuator 2, and is beneficial to optimizing the mixing effect of the first fluid and the second fluid.

FIG. 9 schematically shows a three-dimensional view of an embodiment of a nozzle in which the inner wall surface and the outer wall surface of the insulating medium are chamfered.

According to an embodiment of the present disclosure, as shown in FIG. 9 , the inner wall surface and the inner wall surface of the insulating medium are both chamfered so that the outlet end is configured as a sharp portion 13 .

According to an embodiment of the present disclosure, as shown in FIG. 9 , the body 1 is made of an insulating material, and the sharp portion 13 serves as an insulating medium 21 .

According to an embodiment of the present disclosure, as shown in FIG. 9 , the first electrodes 23 of two adjacent plasma actuators 2 are staggered, one is substantially parallel to the extension direction of the inner wall surface, and the other is substantially parallel to the extension direction of the outer wall surface.

According to an embodiment of the present disclosure, as shown in FIG. 9 , the second electrodes 22 of two adjacent plasma actuators 2 are staggered, one second electrode 22 is arranged on the inner wall surface, and the other second electrode 22 is arranged on the extension, and each second electrode 22 corresponds to the position of a first electrode 23 and is roughly parallel to the extension direction of the corresponding first electrode 23 .

In an illustrative embodiment, as shown in FIG. 9 , the inner wall surface and the outer wall surface of the outlet end form an angle (β as shown in FIG. 9 ) along the radial cross section of the body 1 .

In detail, the included angle includes but is not limited to being configured as any angle between 30° and 120°, such as 30°, 35°, 40° and other angles.

In such an embodiment, the outlet end extends along the axial direction of the body 1 to form a sharp angle structure, which is beneficial to enhancing the deflection movement of the airflow and can more fully exert the disturbance effect of the plasma exciter 2 to achieve a better excitation effect.

FIG. 10 schematically shows a perspective view of an embodiment of a nozzle provided with a third electrode.

According to an embodiment of the present disclosure, as shown in FIG. 10 , the first electrode 23 is configured as an annular structure along an extension direction substantially the same as the axial direction of the body 1 , and the first electrode 23 is disposed in the sharp portion 13 .

In an illustrative embodiment, the first electrode 23 coincides with a midline of the body 1 in the thickness direction.

In such an embodiment, the first electrode 23 extends in a direction substantially the same as the axial direction of the body 1 (i.e., parallel to the axis of the body 1), and the thickness of the insulating medium 21 is no longer a fixed value, but gradually decreases from bottom to top. In this way, the excitation intensity of the plasma exciter 2 can be more effectively improved.

According to an embodiment of the present disclosure, as shown in Figure 10, the nozzle also includes a plurality of third electrodes 25, each third electrode 25 is arranged on the inner wall surface or the outer wall surface between two adjacent second electrodes 22, away from the second electrode 22, and the third electrode 25 is electrically connected to the high voltage end 32 of the plasma generator 3.

In such an embodiment, the third electrode 25 is electrically connected to the high voltage terminal 32 of the plasma generator 3, which is equivalent to adding a plurality of second electrodes 22. This increases the plasma area of the plasma exciter 2, which helps to enhance the excitation effect of the plasma exciter 2.

It will be appreciated by those skilled in the art that the features described in the various embodiments and/or claims of the present invention may be combined and/or coupled in several ways, even if such combinations and/or couplings are not explicitly described in the present invention. In particular, the features described in the various embodiments and/or claims of the present invention may be combined and/or coupled in several ways without departing from the spirit and teachings of the present invention. All such combinations and/or couplings fall within the scope of the present invention.

The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (19)

1. A nozzle, characterized in that it comprises: A body (1) is configured as a tubular structure, wherein the interior of the body (1) defines a first flow channel (11), and the exterior of the body (1) defines a second flow channel (12); and A plurality of plasma actuators (2) are evenly arranged along the circumferential direction of the outlet end of the body (1), and two adjacent plasma actuators (2) induce the flow of the fluid in opposite directions, so that the first fluid passing through the first flow channel (11) and the second fluid passing through the second flow channel (12) are mixed; and A partition (24) made of insulating material; The plasma actuator (2) comprises: A first electrode (23) is disposed on the outlet end; an insulating medium (21), covering at least a portion of the first electrode (23); and A second electrode (22) is disposed on the insulating medium (21) and is isolated from the first electrode (23); The first electrode (23) is electrically connected to a ground terminal (31) of a plasma generator (3), and the second electrode (22) is electrically connected to a high voltage terminal (32) of the plasma generator (3); a partition (24) is arranged on the insulating medium (21) between the second electrodes (22) of two adjacent plasma actuators (2) to isolate the two adjacent second electrodes (22). 2. The nozzle according to claim 1 is characterized in that the excitation voltage of at least a part of the plasma exciter (2) is constructed to be adjustable to adjust the excitation intensity of the plasma exciter (2) so that the mixing degree of the first fluid and the second fluid with the air is adjustable. 3. The nozzle according to claim 1 is characterized in that the second electrodes (22) of two adjacent plasma actuators (2) are installed on the insulating medium (21) in an offset manner along the radial direction of the main body (1), and one of the second electrodes (22) is constructed to be close to the inner wall surface of the outlet end, and the other is constructed to be close to the outer wall surface of the outlet end. 4. The nozzle according to claim 1, characterized in that a plurality of the plasma actuators (2) share one insulating medium (21), and the insulating medium (21) covers at least a portion of each of the first electrodes (23). 5. The nozzle according to claim 3 or 4 is characterized in that the second electrode (22) is configured to rotate around the axis of the body (1), and is suitable for adjusting the relative position of the second electrode (22) with respect to the first electrode (23) to adjust the induced flow direction of the fluid by the formed plasma. 6. The nozzle according to claim 3 or 4, characterized in that the outlet end is configured as a planar structure extending in a radial direction with respect to the body (1). 7. The nozzle according to claim 6, characterized in that a plurality of first electrodes (23) of the plasma actuators (2) are installed on the axial end surface of the outlet end at uniform intervals along the circumferential direction. 8. The nozzle according to claim 7, characterized in that the first electrode (23) is configured as a fan-shaped structure. 9. The nozzle according to claim 8 is characterized in that the end of the first electrode (23) facing the inner wall surface or the outer wall surface of the outlet end is configured as a bent portion, which is exposed to the outside of the insulating medium (21) and extends along the axial direction of the body (1). 10. The nozzle according to claim 6, characterized in that a plurality of the plasma actuators (2) share one first electrode (23), and the first electrode (23) is installed on the axial end surface of the outlet end. 11. The nozzle according to claim 10, characterized in that the first electrode (23) is configured as an annular structure. 12. The nozzle according to any one of claims 7 to 11, characterized in that the second electrode (22) is mounted on the surface of the insulating medium (21) facing away from the first electrode (23), and in the projection in the axial direction of the body (1), the first electrode (23) covers the second electrode (22). 13. The nozzle according to any one of claims 7 to 11, characterized in that the second electrode (22) is installed on a surface of the insulating medium (21) between a surface facing the first electrode (23) and a surface facing away from the first electrode (23). 14. The nozzle according to claim 3 or 4, characterized in that the inner wall surface and the outer wall surface of the insulating medium are both chamfered so that the outlet end is configured as a sharp portion (13). 15. The nozzle according to claim 14, characterized in that the body (1) is made of insulating material, and the sharp portion (13) serves as the insulating medium (21). 16. The nozzle according to claim 15 is characterized in that the first electrodes (23) of two adjacent plasma actuators (2) are staggered, one is roughly parallel to the extension direction of the inner wall surface, and the other is roughly parallel to the extension direction of the outer wall surface. 17. The nozzle according to claim 16 is characterized in that the second electrodes (22) of two adjacent plasma actuators (2) are staggered, one second electrode (22) is arranged on the inner wall surface, and the other second electrode (22) is arranged on the outer wall surface, and each second electrode (22) corresponds to the position of a first electrode (23) and is roughly parallel to the extension direction of the corresponding first electrode (23). 18. The nozzle according to claim 15, characterized in that the first electrode (23) is constructed as an annular structure and is arranged in the sharp portion (13) along an extension direction that is substantially the same as the axial direction of the body (1). 19. The nozzle according to claim 18 is characterized in that it also includes a plurality of third electrodes (25), each of the third electrodes (25) is arranged on a side of the inner wall surface between two adjacent second electrodes (22) away from the second electrode (22), and the third electrode (25) is electrically connected to the high voltage end (32) of the plasma generator (3).