CN105514792B - A kind of high energy jet stream exciter - Google Patents

Abstract

The embodiment of the invention discloses a high-energy jet exciter, which relates to the technical field of active flow control, and can increase the velocity and momentum of the continuous jet under the condition that the flow of the continuous jet remains unchanged. The method of the present invention comprises: anode 1, electric spark generator housing 2, cathode 3, electric spark generator cavity 4, continuous jet channel inlet 5, electric spark generator injection hole 6, continuous jet channel 7, high-energy jet The exciter casing 8 and the high-energy jet exciter injection hole 9; the outer surface of the electric spark generator casing 2 and the inner surface of the high-energy jet exciter casing 8 form a continuous jet channel 7; in the continuous jet channel 7, close to the electric spark One end of the jet hole 6 of the generator is the jet hole 9 of the high-energy jet exciter, and the end away from the jet hole 9 of the high-energy jet exciter is the entrance 5 of the continuous jet channel.

Description

A high-energy jet exciter

technical field

The invention relates to the technical field of active flow control, in particular to an excitation device capable of generating a stable jet with higher momentum or velocity.

Background technique

In the development process of active flow control technology, in order to better solve the application problems in the field of high-speed flow field flow control, some control schemes and control equipment are designed. Among them, the use of electric spark generators to generate high-speed synthetic jets is one of the most feasible solutions for flow control in high-speed flow fields.

However, the current EDM solution to generate high-speed synthetic jets also has some technical defects. For example, although the formed synthetic jet has a high jet velocity, its mass flow rate is very small, and the EDM excitation energy density is high, resulting in The air temperature and pressure increase sharply. On the one hand, there are specific requirements for the material selection of the excitation chamber. On the other hand, it is not conducive to the external ambient gas to fully fill the excitation chamber during the backfilling stage. Therefore, in many design schemes, it is necessary to reduce the excitation frequency to allow enough time for the backfill stage, or to strengthen the heat exchange between the wall of the excitation chamber and the outside air to reduce the temperature of the backfill gas entering the excitation chamber. However, reducing the frequency means that the flow rate of the jets excited in the same time is reduced, and the ability of the synthetic jets formed in the same time to control and act on the flow of the high-speed flow field is weakened. At the same time, due to the small surface area of the excitation cavity, even if some measures are taken to enhance heat transfer and reduce the surface temperature, the effect is not ideal. Therefore, the synthetic jet flow generated by a single electric spark generator is low, and the natural cooling time of the generator shell and inner cavity is long, and the working frequency is low. The above defects make it difficult to apply the synthetic jet generated by the electric spark generator to the flow control of the high-speed flow field.

Contents of the invention

The embodiment of the present invention provides a high-energy jet exciter, which can greatly increase the velocity and momentum of the continuous jet through the enhancement of the energy of the electric spark generator under the condition that the intake volume of a continuous fluid remains unchanged. At the same time, this continuous fluid increases the amount of backfill gas in the EDM chamber, shortens the time for the gas in the EDM chamber to return to the density before work, thereby increasing the operating frequency of the EDM.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In a first aspect, an embodiment of the present invention provides a high-energy jet exciter, comprising: an anode (1), an electric spark generator housing (2), a cathode (3), an electric spark generator cavity (4), a continuous Jet channel inlet (5), electric spark generator injection hole (6), continuous jet flow channel (7), high-energy jet exciter shell (8) and high-energy jet exciter injection hole (9); said electric spark generator The shape of the cavity (4) is a cylindrical cavity with holes; the shape of the high-energy jet exciter shell (8) is a cylindrical cavity with holes; the high-energy jet exciter shell (8) surrounds the electric spark Generator housing (2); the anode (1) and the cathode (3) are connected to an external high-voltage power supply through wires and used for spark discharge, and the other end opening of the electric spark generator cavity (4) forms the The spark generator injection hole (6); the outer surface of the spark generator shell (2) and the inner surface of the high-energy jet exciter shell (8) form the continuous jet channel (7); In the continuous jet channel (7), one end close to the injection hole (6) of the electric spark generator is the injection hole (9) of the high-energy jet exciter, and the end away from the injection hole (9) of the high-energy jet exciter is One end is the inlet (5) of the continuous jet channel.

With reference to the first aspect, in the first possible implementation of the first aspect, the injection hole (9) of the high-energy jet exciter is in a contraction-expansion shape and has a smooth transition at the throat; the injection hole of the electric spark generator The diameter of (6) is equivalent to the diameter of the throat of the jet hole (9) of the high-energy jet exciter.

With reference to the first aspect, in the second possible implementation of the first aspect, the distance between the high-energy jet exciter casing (8) and the electric spark generator casing (2) is 0.5-2.5 times the diameter of the injection hole (6).

In combination with the first aspect, in a third possible implementation of the first aspect, the material of the electric spark generator cavity (4) is a metal material with good thermal conductivity; the high-energy jet exciter shell (8) The material is insulating material.

The high-energy jet exciter provided by the embodiment of the present invention, compared with the current electric spark generator that does not have a continuous jet channel, this embodiment greatly increases the speed of the continuous jet in the injection stage of the jet generated by the electric spark generator and momentum; at the same time, in the suction stage of the EDM, the generator inhales more continuous jet gas with lower temperature and higher density, and more gas in the EDM cavity can be used in the next cycle . Therefore, under the condition that the air intake of the continuous jet is constant, the speed and momentum of the continuous jet are greatly increased through the strengthening of the electric spark energy. At the same time, the amount of gas backfilled by the EDM increases, the time taken for the gas in the EDM cavity to return to the density before work is shortened, and the operating frequency of the EDM can be increased.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

1 is a schematic diagram of a high-energy jet exciter provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the three-dimensional structure of the high-energy jet exciter provided by the embodiment of the present invention;

Each label in the accompanying drawings indicates: 1. Anode; 2. Shell of high-energy jet exciter; 3. Cathode; 4. Cavity of high-energy jet exciter; 5. Continuous jet passage entrance; .Continuous jet channel; 8. Shell of high-energy jet exciter; 9. Injection hole of high-energy jet exciter.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Hereinafter, embodiments of the present invention will be described in detail, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, and cannot be construed as limiting the present invention.

Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present utility model refers to the presence of the stated features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features , integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Additionally, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as commonly understood by those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein explain.

The spark generator provided by the embodiment of the present invention, as shown in Fig. 1 and Fig. 2, includes: anode (1), spark generator shell (2), cathode (3), spark generator cavity (4) , continuous jet channel inlet (5), electric spark generator injection hole (6), continuous jet channel (7), high-energy jet exciter casing (8) and high-energy jet exciter injection hole (9).

Wherein, the shape of the electric spark generator cavity (4) is a cylindrical cavity with holes, the shape of the high-energy jet exciter housing (8) is a cylindrical cavity with holes, and the high-energy jet exciter housing (8) surrounds the electric spark The generator casing (2), the anode (1) and the cathode (3) are connected to an external high-voltage power supply through wires and used for spark discharge, and the other end of the spark generator cavity (4) is opened to form a spark generator injection hole (6 ), the outer surface of the electric spark generator shell (2) and the inner surface of the high-energy jet exciter shell (8) form a continuous jet channel (7), in the continuous jet channel (7), near the electric spark generator jet One end of the hole (6) is the jet hole (9) of the high-energy jet exciter, and the end away from the jet hole (9) of the high-energy jet exciter is the entrance (5) of the continuous jet channel.

In this embodiment, when the electric spark generator is not working, the fluid enters the continuous jet channel (7) through the continuous jet channel inlet (5), and finally flows out from the injection hole (9) of the high-energy jet exciter to generate A jet that controls the flow of a high-speed flow field. When the electric spark generator is working, the anode (1) and the cathode (3) are connected to an external high-voltage power supply at a certain frequency through a wire to load a high voltage, and the high voltage shock between the anode (1) and the cathode (3) Through the air, spark discharge is generated, and the energy of the spark acts on the air in the cavity (4) of the spark generator, rapidly increasing the pressure and temperature of the air, and the high-pressure and high-temperature air is ejected from the injection hole (6) of the spark generator , the ejected high-speed spark-type synthetic jet makes the air flow at the injection hole (9) of the high-energy jet exciter accelerate to eject, so that the continuous jet is strengthened by the speed and momentum of the injection; when the electric spark generator cavity (4) When the air pressure in the jet decreases to less than the fluid pressure at the spark generator injection hole (6) along with the high-speed spark-type synthetic jet injection, part of the gas in the continuous jet channel (7) will flow from the spark generator jet hole (6) Flow into the electric spark generator cavity (4), replenish the quality of the gas in the cavity, and excite the high-speed spark type synthetic jet to accumulate gas for the next electric spark discharge. Since the volume of the electric spark generator cavity (4) is very small, the accumulated gas will not affect the air flow at the injection hole (9) of the high-energy jet exciter.

And, a stream of gas flows in from the continuous jet channel inlet (5), passes through the continuous jet channel (7), thereby cooling the electric spark generator casing (2), protecting the electric spark generator casing (2), and at the same time The gas temperature in the spark generator cavity (4) is reduced.

Further, the injection hole (9) of the high-energy jet exciter in the present embodiment is a contraction-expansion shape and a smooth transition at the throat; the diameter of the injection hole (6) of the electric spark generator is the same The diameter of the throat is comparable.

When the electric spark generator is running, the spark-type synthetic jet ejected from the ejection hole (6) of the electric spark generator promotes and strengthens the continuous jet at the ejection hole (9) of the high-energy jet exciter. The velocity of the airflow at the hole (9) continues to accelerate at the constricted-expanded shaped channel, and the velocity and momentum of the airflow continue to increase.

Further, the distance between the shell (8) of the high-energy jet exciter and the shell (2) of the spark generator in this embodiment is 0.5-2.5 times the diameter of the spray hole (6) of the spark generator.

In the present embodiment, the continuous jet passage (7) channel height, the spark generator cavity (4) volume, the diameter of the spark generator injection hole (6) and the high-energy jet exciter injection hole (9) throat The diameter of the point will affect the strengthening effect of the spark-type synthetic jet on the continuous jet.

In the preferred version of the present embodiment, the electric spark generator cavity (4) volume is relatively small, when the diameter of the spark generator injection hole (6) is the same as the diameter at the throat of the high-energy jet exciter injection hole (9) Simultaneously, the interval distance between the high-energy jet exciter housing (8) and the electric spark generator housing (2) is the 0.5-2.5 times of the diameter of the spark generator injection hole (6) within the scope of the spark type synthetic jet to the continuous jet. The strengthening effect is most obvious.

Optionally, the material of the spark generator cavity (4) in this embodiment is a metal with good thermal conductivity; the material of the high-energy jet exciter shell (8) is an insulating material.

In the practical application of this embodiment, the shape of the electric spark generator is designed as a cylindrical cavity with holes. Wherein, the anode (1) and the cathode (3) are located at the bottom of the electric spark generator cavity (4). The anode (1) is threadedly connected to the electric spark generator shell (2). The anode (1) and the cathode (3) are connected to an external high-voltage power supply through wires to realize spark discharge at a certain control frequency. The other end of the electric spark generator cavity (4) is an electric spark generator injection hole (6), and the electric spark generator injection hole (6) is a cylindrical straight hole. The material of the electric spark generator shell (2) is a metal with good thermal conductivity. The structural parameters and materials of the anode (1) and the cathode (3) are the same as those of a common column electric spark plug. The exterior of the electric spark generator housing (2) includes a high-energy jet exciter injection hole (9), a high-energy jet exciter housing (8), a continuous jet channel (7) and a continuous jet channel inlet (5). The spark generator shell (2) and the high-energy jet exciter shell (8) form a continuous jet channel (7), and the high-energy jet exciter shell (8) is shaped as a cylindrical cavity with holes. One end of the shell (8) of the high-energy jet exciter is an inlet (5) of a circular continuous jet channel, and the other end is an injection hole (9) of the high-energy jet exciter. The shell (8) of the high-energy jet exciter is an insulating material. The injection hole (9) of the high-energy jet exciter is in the shape of constriction and expansion, and the transition is smooth at the throat. The diameter of the injection hole (6) of the electric spark generator is equivalent to the diameter at the throat of the injection hole (9) of the high-energy jet exciter.

When the electric spark generator is running, the continuous jet channel inlet (5) is fed with a certain pressure and flow of gas, and the pressure difference ratio between the continuous jet channel inlet (5) and the injection hole (9) of the high-energy jet exciter is controlled at Optimum between 1.1-1.8, the jet hole (9) of the high-energy jet exciter produces a high-energy continuous jet. Because the flow resistance is the same everywhere between the continuous jet passage inlet (5) and the spark generator injection hole (6), the counter-current airflow makes the flow velocity on the axis of the spark generator jet hole (6) be zero, and Flow stagnation point, the pressure in the EDM cavity (4) is the same as the pressure at the EDM injection hole (6), and the airflow will not enter the EDM cavity from the EDM injection hole (6) cavity (4). After the jet is stabilized, an external high-voltage power supply causes discharge between the anode (1) and the cathode (3), and the spark energy after discharge heats the gas in the cavity (4) of the spark generator to make the cavity (4) of the spark generator The temperature and pressure in ) rise sharply, and a high-speed spark-type synthetic jet is generated at the injection hole (6) of the electric spark generator. At this time, the spark-type synthetic jet is far greater than the continuous jet generated at the entrance (5) of the continuous jet channel , the spark-type synthetic jet at the injection hole (6) of the electric spark generator will push and strengthen the continuous jet at the injection hole (9) of the high-energy jet actuator, and the velocity and momentum of the airflow at the injection hole (9) of the high-energy jet actuator greatly increase. Thereafter, due to the cooling effect of the gas in the continuous jet channel (7) on the spark generator shell (2), the temperature and pressure of the gas in the spark generator cavity (4) decrease, and the spark generator begins to Gas is inhaled outside the injection hole (6) of the electric spark generator. At this time, most of the gas entering the bypass pipe from the continuous jet channel inlet (5) flows out from the injection hole (9) of the high-energy jet exciter, and a very small part flows out from the injection hole (9) of the electric spark generator. The spark generator injection hole (6) flows into the spark generator cavity (4) to replenish and cool the gas in the spark generator cavity (4), and the process of the spark generator cavity (4) sucking gas continues until Until the next discharge between the anode (1) and the cathode (3), the electric spark generator works periodically, and the spark-type synthetic jet at the injection hole (6) of the electric spark generator periodically strengthens the injection hole of the high-energy jet exciter The continuous jet at (9), the velocity and momentum of the actual jet at the nozzle hole (9) of the high-energy jet exciter increase.

Since the existing electric spark generator does not have a continuous jet channel (7) structure, compared with the electric spark generator that does not have a continuous jet channel (7), in the injection stage of the present embodiment, the speed of the continuous jet and The momentum is greatly increased, and at the same time, in the suction stage, the exciter sucks in more gas with lower temperature and higher density, and more gas in the cavity can be used in the next cycle. Therefore, under the condition of constant intake air volume, the continuous jet flow enhanced by sparks increases in speed and momentum. At the same time, the amount of gas backfilled by the EDM increases, the time taken for the gas in the EDM cavity to return to the density before work is shortened, and the operating frequency of the EDM can be greatly increased.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, please refer to part of the description of the method embodiment.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (3)

1. a kind of high energy jet stream exciter, which is characterized in that including：Anode (1), sparker shell (2), cathode (3), Sparker cavity (4), continuity fluidic channel entrance (5), sparker spray-hole (6), continuity jet stream are logical Road (7), high energy jet stream exciter shell (8) and high energy jet stream exciter spray-hole (9)；

The shape of the sparker cavity (4) is cylinder shape belt hole cavity；

The shape of the high energy jet stream exciter shell (8) is cylinder shape belt hole cavity；

The high energy jet stream exciter shell (8) surrounds the sparker shell (2)；

The anode (1) and the cathode (3) are connected with external high voltage power supply by conducting wire and are used for spark discharge, the electrical fire Flower generator cavity (4) other end is open to form the sparker spray-hole (6)；

The outer surface of the sparker shell (2) and the inner surface of the high energy jet stream exciter shell (8) form institute State continuity fluidic channel (7)；

It is that the high energy is penetrated close to one end of the sparker spray-hole (6) in the continuity fluidic channel (7) Exciter spray-hole (9) is flowed, one end far from the high energy jet stream exciter spray-hole (9) is that the continuity fluidic channel enters Mouth (5).

2. high energy jet stream exciter according to claim 1, which is characterized in that the high energy jet stream exciter shell (8) Spacing distance with the sparker shell (2) is the 0.5-2.5 of the diameter of the sparker spray-hole (6) Times.

3. high energy jet stream exciter according to claim 1, which is characterized in that the sparker cavity (4) Material is the metal material of Thermal conductivity；

The material of the high energy jet stream exciter shell (8) is insulating materials.