CN219372649U - Plasma synthetic jet exciter - Google Patents

Abstract

The utility model discloses a plasma synthetic jet exciter, which comprises: the body is provided with an excitation chamber, and is provided with an air inlet and an air outlet which are communicated with the excitation chamber; a first electrode and a second electrode extending into the excitation chamber; a power supply for supplying power to the first electrode and the second electrode; a one-way valve in one-way communication with the air inlet; and a nozzle provided with a jet channel and a jet extension surface; the jet flow channel is communicated with the air outlet and is provided with a jet flow port, and the jet flow channel is defined with a jet flow direction; the jet flow extending surface is positioned at one side of the jet flow port, and the jet flow port is smoothly connected with the jet flow extending surface; the jet direction is inclined towards the jet extension surface; the exciter can enable the plasma jet to flow along the wall, and a local separation area is avoided from being formed when the plasma jet is emitted.

Description

Plasma synthetic jet exciter

Technical Field

The utility model relates to the technical field of plasmas, in particular to a plasma synthetic jet exciter.

Background

The jet hole of the exciter is generally designed into an open mouth shape so as to facilitate air suction, but the structure can lead the plasma jet to be ejected only along the axial direction of the jet hole, and in the application scenes such as the clearance flow of a rotor blade of a gas compressor, the ejection mode is easy to form a local separation area at the wall surface of a casing, thereby influencing the stability expansion effect of the jet at the top of a blade.

Disclosure of Invention

The present utility model aims to overcome the above-mentioned drawbacks or problems with the background art, and to provide a plasma synthetic jet actuator which is capable of enabling a plasma jet to flow against the wall, avoiding the formation of a localized separation zone of the plasma jet when it is ejected.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a plasma synthetic jet actuator comprising: the body is provided with an excitation chamber, and is provided with an air inlet and an air outlet which are communicated with the excitation chamber; a first electrode and a second electrode extending into the excitation chamber; a power supply for powering the first and second electrodes; a one-way valve in one-way communication with the air inlet; and a nozzle provided with a jet channel and a jet extension surface; the jet flow channel is communicated with the air outlet and is provided with a jet flow port, and the jet flow channel is defined with a jet flow direction; the jet flow extending surface is positioned at one side of the jet flow port, and the jet flow port is smoothly connected with the jet flow extending surface; the jet direction is inclined towards the jet extension face.

Further, the jet flow channel sequentially forms a contraction section and a bending section from the air outlet to the jet flow port; the overflow area of the contraction section is gradually reduced from the air outlet to the joint of the air outlet and the bending section; the bending section smoothly extends to the jet port from the joint of the bending section and the contraction section so as to match with the jet port to enable the jet direction to incline towards the jet extending surface.

Further, the jet channel comprises a first wall surface and a second wall surface which are oppositely arranged; the jet extension surface is smoothly connected with the first wall surface.

Further, the distance between the first wall surface and the second wall surface is defined as the width of the jet orifice, and the length of the jet orifice corresponding to the distance is greater than the width of the jet orifice so as to form the strip-shaped jet orifice.

Further, the part of the first wall surface corresponding to the contraction section is smoothly bent from the air outlet to the joint of the first wall surface and the bending section towards the second wall surface; the second wall surface is disposed flat against the portion of the convergent section.

Further, the portions of the first wall surface and the second wall surface corresponding to the curved section are smoothly curved from the junction of the curved section and the constricted section to the jet port at the same curvature toward the position of the jet extending surface.

Further, the jet extension surface is perpendicular to the extension direction of the portion of the second wall surface corresponding to the constricted section.

As can be seen from the above description of the present utility model, the present utility model has the following advantages over the prior art:

1. the plasma synthetic jet exciter provided by the utility model is used for electrifying the first electrode and the second electrode through the power supply to form plasma in the exciting chamber and emitting the plasma synthetic jet through the nozzle, wherein the nozzle is provided with the jet channel and the jet extension surface, the jet channel can receive the plasma formed in the exciting chamber and emit the plasma synthetic jet from the jet port, the jet port is smoothly connected with the jet extension surface, the jet direction is inclined towards the jet extension surface, and in the process of emitting the plasma synthetic jet from the jet channel, the plasma synthetic jet can be attached to the jet extension surface along the jet direction due to the influence of the coanda effect, so that when the plasma synthetic jet exciter is applied to scenes such as gap flow of a rotor blade of a compressor, a local separation area is not formed at the position of the jet port of the plasma synthetic jet, and the stability expanding effect of the blade top jet is effectively ensured.

2. The jet channel comprises a contraction section and a bending section, the contraction section can converge the plasma synthetic jet, the jet speed is improved, and the bending section can utilize the coanda effect to enable the ejected plasma synthetic jet to be attached to the jet extension surface.

3. The jet channel comprises a first wall surface and a second wall surface, wherein the first wall surface is smoothly connected with the jet extension surface, and the plasma synthetic jet has a tendency of being attached to the first wall surface when being emitted from the jet orifice, so that the plasma synthetic jet can be better attached to the jet extension surface.

4. The part of the first wall surface contraction section is smoothly bent, and the part of the second wall surface contraction section is flatly arranged, so that the kinetic energy loss caused by the impact of the plasma synthetic jet on the wall surface is reduced.

5. The parts of the curved sections of the first wall surface and the second wall surface are smoothly curved with the same curvature, and the plasma synthetic jet can be well attached to the first wall surface and the jet direction is limited by the second wall surface.

6. The jet extension surface is perpendicular to the second wall surface contraction section part, so that the plasma synthetic jet exciter can be more conveniently applied to scenes such as blade top jet and the like.

7. The jet orifice is strip-shaped, and the plasma synthetic jet is sheet-shaped when being ejected, so that the stability expanding effect of the plasma synthetic jet can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the description of the embodiments below are briefly introduced, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of an embodiment of a plasma synthetic jet actuator provided by the present utility model;

FIG. 2 is a schematic view 1 showing the use of the plasma synthetic jet actuator of FIG. 1 in a compressor;

FIG. 3 is a schematic view of the use of the plasma synthetic jet actuator of FIG. 1 in a compressor;

FIG. 4 is a schematic view of the use of the plasma synthetic jet actuator of FIG. 1 in a compressor;

fig. 5 is a schematic view of a use state of the plasma synthetic jet actuator in fig. 1 applied to a compressor 4.

The main reference numerals illustrate:

a body 10; an excitation chamber 101; an air inlet 102; an air outlet 103; a one-way valve 20; a check valve inlet 201; a first electrode 31; a second electrode 32; a power supply 33; a nozzle 40; a first wall surface 41; a second wall 42; a constriction section 401; a curved section 402; jet port 403; a jet extension surface 404; the compressor inner wall surface 50.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It is to be understood that the described embodiments are preferred embodiments of the utility model and should not be taken as excluding other embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without creative efforts, are within the protection scope of the present utility model.

In the claims, specification and drawings hereof, unless explicitly defined otherwise, the terms "first," "second," or "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.

In the claims, specification and drawings of the present utility model, unless explicitly defined otherwise, references to orientation or positional relationship such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. are based on the orientation and positional relationship shown in the drawings and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element referred to must have a particular orientation or be constructed and operated in a particular orientation, nor should it be construed as limiting the particular scope of the utility model.

In the claims, specification and drawings of the present utility model, unless explicitly defined otherwise, the term "fixedly connected" or "fixedly connected" should be construed broadly, i.e. any connection between them without a displacement relationship or a relative rotation relationship, that is to say includes non-detachably fixedly connected, integrally connected and fixedly connected by other means or elements.

In the claims, specification and drawings of the present utility model, the terms "comprising," having, "and variations thereof as used herein, are intended to be" including but not limited to.

An embodiment of the present utility model provides a plasma synthetic jet actuator, and in particular to fig. 1, which mainly includes a body 10, a first electrode 31, a second electrode 32, a power supply 33, a check valve 20, and a nozzle 40.

Wherein the body 10 is provided with an excitation chamber 101 and with an air inlet 102 and an air outlet 103 communicating with the excitation chamber 101. Referring to fig. 1, the body 10 may be regarded as a rectangular parallelepiped box, the interior space of which forms the excitation chamber 101, and the air inlet 102 is formed on the lower surface of the body 10, and the air outlet 103 is formed on the upper surface thereof, with the positions of the air inlet 102 and the air outlet 103 corresponding to each other, taking the direction shown in fig. 1 as an example.

The first electrode 31 and the second electrode 32 are fixedly mounted on the body 10, respectively, and have one end portion extending into the excitation chamber 101, specifically, the first electrode 31 is mounted at a left side position of the body 10 and the second electrode 32 is mounted at a right side position of the body 10, opposite to each other, so as to form a discharge therebetween.

The power supply 33 is used to power the first electrode 31 and the second electrode 32, and may specifically be a high voltage pulsed power supply 33 capable of intermittently supplying power to the first electrode 31 and the second motor in the form of pulses, thereby enabling the first electrode 31 and the second electrode to ionize the air in the excitation chamber 101 to form plasma.

The check valve 20 is in one-way communication with the air inlet 102, and is specifically mounted on the body 10 at a position corresponding to the air inlet 102, and has a check valve 20 inlet and a check valve 20 outlet, wherein the check valve 20 outlet is directly communicated with the air inlet 102, and external air can only flow from the check valve 20 inlet to the check valve 20 outlet, but cannot flow from the check valve 20 outlet to the check valve 20 inlet, so that the check valve 20 can ensure that air in the excitation chamber 101 cannot escape from the air inlet 102, but when air supplementing is needed in the excitation chamber 101, the air can enter the excitation chamber 101 from the check valve 20.

The nozzle 40 is provided with a jet channel and a jet extension surface 404, the jet channel is communicated with the air outlet 103 and is provided with a jet orifice 403, and the jet channel is defined with a jet direction; the jet flow extending surface 404 is positioned at one side of the jet flow port 403, and the jet flow extending surfaces 404 of the jet flow port 403 are smoothly connected; wherein the jet direction is inclined towards the jet extension surface 404.

Specifically, the jet channel sequentially forms a constriction section 401 and a bending section 402 from the air outlet 103 to the jet port 403, the flow passage area of the constriction section 401 gradually decreases from the air outlet 103 to the junction with the bending section 402, and the bending section 402 smoothly extends from the junction with the constriction section 401 to the jet port 403 to cooperate with the jet port 403 to enable the jet direction to incline towards the jet extension surface 404.

Referring to fig. 1, the fluidic channel includes a first wall 41 and a second wall 42 disposed opposite to each other, and a jet extension 404 smoothly adjoins the first wall 41. Taking the direction shown in fig. 1 as an example, the wall surface on the left side is a first wall surface 41, the wall surface on the right side is a second wall surface 42, and the two wall surfaces are mutually matched and jointly surround together with other wall surfaces to form the above-mentioned jet channel, only the first wall surface 41 and the second wall surface 42 are shown here, and according to the common knowledge in the art, it is obvious that other wall surfaces for surrounding to form the jet channel are also provided, or in one embodiment, the first wall surface 41 and the second wall surface 42 can be connected at end positions or can surround to form the jet channel. It should be noted that the fluidic channel has a channel structure with two ends penetrating, and therefore, the first wall 41 and the second wall 42 have non-connected portions at least at the two ends in the flow direction of the fluidic channel. The flow passing direction refers to the passing direction of the plasma synthetic jet in the jet channel when the plasma synthetic jet is emitted from the exciting chamber 101 through the jet channel, the flow passing direction is determined by the shape of the jet channel, the flow passing area refers to the sectional area of the jet channel in the flow passing direction, and when the flow passing area is reduced, the flow speed of the plasma synthetic jet is increased.

The two ends of the contraction section 401 are respectively connected with the air outlet 103 and the bending section 402 on the body 10, and the overflow area is gradually reduced, so that the flow velocity of the plasma synthetic jet is accelerated after the plasma synthetic jet passes through the contraction section 401; after that, the synthetic jet of the plasma enters the bending section 402, one end of the bending section 402 extends to the jet orifice 403, and meanwhile, the jet orifice 403 is smoothly connected with the jet extending surface 404, and the bending shape of the bending section 402 defines the jet direction, so that after the synthetic jet of the plasma passes through the bending section 402, the synthetic jet of the plasma continues to flow along the jet extending surface 404 when being ejected from the jet orifice 403 under the action of the coanda effect, thereby avoiding forming a local separation area at the position of the jet orifice 403.

Specifically, the portion of the first wall surface 41 corresponding to the contracted section 401 is smoothly curved from the air outlet 103 to the junction thereof with the curved section 402 toward the second wall surface 42, and the portion of the second wall surface 42 corresponding to the contracted section 401 is disposed straight; the portions of the first wall surface 41 and the second wall surface 42 corresponding to the curved section 402 are smoothly curved from the junction of the curved section 402 and the constricted section 401 to the jet port 403 with the same curvature toward the jet extending surface 404.

It should be understood that the above-mentioned "smoothly curved toward the second wall surface 42" and "smoothly curved toward the position of the jet extending surface 404" are both directions of the curvature of the first wall surface 41 and the second wall surface 42, taking the position of each wall surface as an example, as shown in fig. 1. And as shown in fig. 1, the jet extension surface 404 is located to the left of the jet port 403, so that the jet direction is also inclined to the left.

The first wall 41 is gradually bent towards the right side from bottom to top, and the second wall 42 is simultaneously arranged flatly from bottom to top, and the two walls cooperate to form a constriction section 401 of the jet channel at the portion, and the constriction of the overflow area is mainly caused by the bending of the first wall 41, so that the smooth bending of the first wall 41 can reduce the kinetic energy loss of the plasma synthetic jet. Above the constriction section 401 is a curved section 402, and the first wall surface 41 and the second wall surface 42 of the curved section 402 are smoothly curved from bottom to top toward the left, and the curvatures of the two are the same, so that the flow passage area of the curved section 402 is approximately a fixed value, and meanwhile, due to the curved shape of the first wall surface 41 and the second wall surface 42, and the smooth connection between the first wall surface 41 and the jet extension surface 404, the plasma synthetic jet flows along the first wall surface 41 to the jet extension surface 404 under the action of the coanda effect.

Referring to fig. 1, taking the direction shown in fig. 1 as an example, the extending direction of the portion of the second wall surface 42 corresponding to the contraction section 401 is the up-down direction, and the plane of the jet extending surface 404 is perpendicular to the up-down direction, the effect of this design can refer to fig. 2 to 5, and when the design is applied to the scene of gas injection on the top of a compressor blade, the jet extending surface 404 can be flush with the inner wall surface 50 of the compressor, so that the plasma synthetic jet can flow onto the inner wall surface of the compressor along the jet extending surface 404 during injection, and the stability expanding effect of the plasma synthetic jet is improved. Specifically, fig. 2 shows a state in which the plasma synthetic jet actuator discharges through the first electrode 31 and the second electrode 32, fig. 3 shows a state in which the plasma synthetic jet actuator starts to discharge the plasma jet outwardly, fig. 4 shows a state in which the plasma synthetic jet actuator discharges the plasma synthetic jet outwardly through the nozzle 40, wherein fig. 4 shows an incoming flow direction, which is consistent with a jet direction when the plasma synthetic jet is attached to the jet extension surface 404, and fig. 5 shows a state in which the plasma synthetic jet actuator sucks air through the nozzle 40 and the check valve 20.

Further, the distance between the first wall surface 41 and the second wall surface 42 is defined as the width of the jet port 403, and the length of the jet port 403 corresponding thereto is greater than the width of the jet port 403 to form a long jet port 403. That is, in this embodiment, the jet port 403 is flat and long, instead of a circular hole, and the flat and long jet port 403 can make the plasma synthetic jet flow take a sheet shape when being ejected, and the shape can increase the influence range of the plasma synthetic jet flow and improve the stability expansion effect of the plasma synthetic jet flow.

The plasma synthetic jet exciter provided by the utility model is used for electrifying the first electrode 31 and the second electrode 32 through the power supply 33 to form plasma in the exciting chamber 101 and emitting the plasma synthetic jet through the nozzle 40, wherein the nozzle 40 is provided with the jet channel and the jet extension surface 404, the jet channel can receive the plasma formed in the exciting chamber 101 and emit the plasma synthetic jet from the jet port 403, the jet port 403 is smoothly connected with the jet extension surface 404, the jet direction is inclined towards the jet extension surface 404, and during the process of emitting the plasma synthetic jet from the jet channel, the plasma synthetic jet can be attached to the jet extension surface 404 along the jet direction due to the influence of coanda effect, so that when the plasma synthetic jet exciter is applied to scenes such as a gap flow of a compressor rotor blade, the plasma synthetic jet can not form a local separation area at the position of the jet port 403, and the stability expanding effect of the blade top jet is effectively ensured.

In addition, since the conventional plasma synthetic jet exciter cannot rapidly supplement enough air from the jet port 403 to enter the exciting chamber 101 by adopting the nozzle 40, the air inlet 102 is additionally arranged on the main body 10, and the air can be rapidly supplemented into the exciting chamber 101 without escaping from the air inlet 102 by utilizing the unidirectional air inlet function of the unidirectional valve 20, so that the normal use of the plasma synthetic jet exciter is ensured.

The foregoing description of the embodiments and description is presented to illustrate the scope of the utility model, but is not to be construed as limiting the scope of the utility model. Modifications, equivalents, and other improvements to the embodiments of the utility model or portions of the features disclosed herein, as may occur to persons skilled in the art upon use of the utility model or the teachings of the embodiments, are intended to be included within the scope of the utility model, as may be desired by persons skilled in the art from a logical analysis, reasoning, or limited testing, in combination with the common general knowledge and/or knowledge of the prior art.

Claims (7)

1. A plasma synthetic jet actuator, comprising:

a body (10) provided with an excitation chamber (101) and provided with an air inlet (102) and an air outlet (103) which are communicated with the excitation chamber (101);

a first electrode (31) and a second electrode (32), both of which extend into the excitation chamber (101);

-a power supply (33) for powering the first electrode (31) and the second electrode (32);

a one-way valve (20) in one-way communication with the air inlet (102); and

a nozzle (40) provided with a jet channel and a jet extension surface (404); the jet flow channel is communicated with the air outlet (103) and is provided with a jet flow port (403), and the jet flow channel is defined with a jet flow direction; the jet flow extending surface (404) is positioned at one side of the jet flow port (403), and the jet flow port (403) is smoothly connected with the jet flow extending surface (404); the jet direction is inclined towards the jet extension face (404).

2. A plasma synthetic jet actuator according to claim 1 wherein the jet channel forms a constriction (401) and a bend (402) in sequence from the gas outlet (103) to the jet orifice (403); the overflow area of the contraction section (401) is gradually reduced from the air outlet (103) to the joint of the air outlet and the bending section (402); the curved section (402) extends smoothly from its junction with the constricted section (401) to the jet orifice (403) to cooperate with the jet orifice (403) to incline the jet direction towards the jet extension face (404).

3. A plasma synthetic jet actuator according to claim 2 wherein the jet channel comprises oppositely disposed first and second walls (41, 42); the jet extension surface (404) is smoothly connected with the first wall surface (41).

4. A plasma synthetic jet actuator according to claim 3 wherein the portion of the first wall (41) corresponding to the constriction (401) is smoothly curved from the gas outlet (103) to the junction thereof with the curved section (402) towards the second wall (42); the second wall (42) is arranged flat in relation to the portion of the constriction (401).

5. A plasma synthetic jet actuator according to claim 4 wherein the portions of the first wall (41) and the second wall (42) corresponding to the curved section (402) are smoothly curved from the junction of the curved section (402) and the constricted section (401) to the jet orifice (403) at the same curvature toward the jet extension surface (404).

6. A plasma synthetic jet actuator according to claim 5 wherein the jet extension (404) is perpendicular to the extension of the portion of the second wall (42) corresponding to the constriction (401).

7. A plasma synthetic jet actuator according to claim 3 wherein the distance between the first wall (41) and the second wall (42) is defined as the width of the jet opening (403), the length of the jet opening (403) corresponding thereto being greater than the width of the jet opening (403) to form the jet opening (403) in the form of a long strip.