Rotating jet plasma excitation device and method

Abstract

The present disclosure relates to a rotating jet plasma excitation device and method, the rotating jet plasma excitation device comprising: a carrier, a jet hole being formed on the surface of the carrier; a dielectric barrier discharge assembly arranged on the surface of the carrier and coaxial with the jet hole, and comprising an insulating medium layer, a plurality of high-voltage electrodes and a plurality of low-voltage electrodes, the plurality of low-voltage electrodes and the plurality of high-voltage electrodes being respectively spaced and annularly arranged on the inner and outer sides of the insulating medium layer, and a single high-voltage electrode corresponding to a low-voltage electrode to form an independent dielectric barrier discharge unit; a corona discharge assembly, which is sleeved outside the dielectric barrier discharge assembly and is used to output a normal main jet into the jet hole, and the corona discharge assembly comprises at least one pair of discharge electrodes, and the at least one pair of discharge electrodes are provided with a discharge structure; and a power supply and control assembly comprising a power supply module and an intelligent control module. The rotating jet plasma excitation device can form a composite rotating jet, effectively disrupt the coherence of the turbulent quasi-order structure, and achieve efficient flow control.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of plasma flow control, in particular, to a rotating jet plasma excitation device and method. BACKGROUND

[0002] In the field of aeronautics, improving the lift of an aircraft and reducing the flight resistance is the core requirement to ensure flight efficiency and economy. With the continuous improvement of the requirements of the aviation industry on flight performance, the traditional technical path relying on aerodynamic shape optimization (such as wing profile design, wing tip wing installation, etc.) has gradually approached the physical performance bottleneck and is difficult to further break through the improvement space of energy efficiency and aerodynamic performance. Under this background, active flow control technology has become a key research direction for further improving the aerodynamic performance of the aircraft, as it can dynamically adapt to the flow field changes of the aircraft in different operating conditions such as take-off, cruising, and landing by real-time intervention in the flow field behavior. Among them, plasma excitation technology, as an important branch of active flow control, has shown good application prospects in core scenarios such as turbulent friction drag reduction and boundary layer transition control, due to its fast response speed, no need for mechanical moving parts, and easy integration with the aircraft surface.

[0003] However, in actual aircraft applications, the flow field environment has high complexity and nonlinearity: on the one hand, the flow field parameters of different flight stages (such as low Reynolds number flow field during take-off and high Reynolds number flow field during cruising) differ significantly; on the other hand, there are dynamic instability phenomena such as turbulent burst and low-speed strip evolution inside the flow field, which puts strict requirements on the dynamic response speed, disturbance direction flexibility, and energy utilization efficiency of the flow control technology.

[0004] However, the existing plasma excitation device cannot meet the above requirements, mainly because: first, the jet direction is single, most plasma excitation devices can only produce normal or horizontal jets in a fixed direction, and cannot adjust the disturbance angle according to the flow field changes, making it difficult to fully cover the intervention requirements of complex flow fields; second, there is no dynamic rotation feature, the jet form is mostly static distribution, and the coherence of the turbulent quasi-order structure cannot be disturbed by rotating motion, and the suppression effect on the near-wall low-speed strip is limited. The above defects make it difficult for the existing plasma excitation device to effectively suppress turbulent burst and delay boundary layer transition, and the flow control effect under different flight conditions fluctuates greatly, which cannot stably meet the demand of the aircraft for efficient and precise flow control. SUMMARY

[0005] The purpose of the present disclosure is to provide a rotating jet plasma excitation device that can form a composite rotating jet, more effectively disturb the coherence of the turbulent quasi-order structure, and achieve more efficient flow control.

[0006] To achieve the above object, the present disclosure provides a rotating jet plasma excitation device, comprising:

[0007] a carrier having a carrier surface for contacting a flow field to be controlled, at least one through jet hole being formed on the carrier surface;

[0008] a dielectric barrier discharge assembly arranged on a side of the carrier surface away from the flow field to be controlled and coaxially arranged with the jet hole, the dielectric barrier discharge assembly being used for forming a rotating airflow field and comprising an insulating dielectric layer, a plurality of high-voltage electrodes and a plurality of low-voltage electrodes, the insulating dielectric layer being configured as a cylindrical structure, the plurality of low-voltage electrodes being spaced and annularly arranged on the inside of the insulating dielectric layer, the plurality of high-voltage electrodes being spaced and annularly arranged on the outside of the insulating dielectric layer, a single high-voltage electrode corresponding to a single low-voltage electrode to form an independent dielectric barrier discharge unit;

[0009] a corona discharge assembly sleeved on the outside of the dielectric barrier discharge assembly and arranged opposite to the jet hole, used for outputting a normal main jet into the jet hole, the corona discharge assembly comprising at least one pair of discharge electrodes, at least one pair of the discharge electrodes being provided with a discharge structure for strengthening the electric field ionization effect;

[0010] a power supply and control assembly, the power supply and control assembly comprising a power supply module and an intelligent control module, the power supply module being used for providing electric energy for the corona discharge assembly and the dielectric barrier discharge assembly, and the intelligent control module being signal connected with the power supply module.

[0011] Optionally, the discharge structure comprises a plurality of discharge needles, each of the discharge needles being uniformly distributed along the circumference of the corresponding discharge electrode, and the needle tip of the discharge needle being directed towards the jet hole.

[0012] Optionally, each pair of the discharge electrodes comprises a ring-shaped shell, a corona negative electrode and a corona positive electrode, the corona positive electrode and the corona negative electrode being configured as a circular ring structure and respectively embedded in two ends of the ring-shaped shell, and the discharge structure being provided on the corona negative electrode of each pair of the discharge electrodes, wherein the end face of the corona positive electrode of a pair of the discharge electrodes close to the jet hole is tightly attached to the jet hole.

[0013] Optionally, the spacing between the corona negative electrode and the corona positive electrode of each pair of the discharge electrodes is 3mm-6mm, the inner diameter of the corona positive electrode is 1mm-2mm smaller than the hole diameter of the jet hole, and the outer diameter of the corona negative electrode is 3mm-5mm smaller than the diameter of the jet hole.

[0014] Optionally, the insulating medium layer is made of polyimide film or aluminum oxide ceramic material, the thickness of the insulating medium layer is 0.05mm-0.5mm; the high-voltage electrode and the low-voltage electrode are both made of copper foil material, and the thickness of each is 0.01mm-0.1mm; the width of the high-voltage electrode is 0.8mm-1.2mm, the width of the low-voltage electrode is 1.8mm-2.2mm, and the spacing between adjacent two high-voltage electrodes and adjacent two low-voltage electrodes is 4mm-5mm.

[0015] Optionally, the rotating jet plasma excitation device further comprises a micro sensor array arranged on the surface of the carrier and connected with the intelligent control module; the micro sensor array is used to collect and feed back the flow velocity, shear stress and flow field separation state parameters of the flow field to the control assembly, and the micro sensor array comprises a hot film anemometer and a MEMS pressure sensor (a sensor manufactured based on micro-electro-mechanical system technology).

[0016] Optionally, the power module comprises a direct current high-voltage pack and a high-voltage sinusoidal wave power supply, the output end of the direct current high-voltage pack is electrically connected with the corona positive electrode, and the grounding end of the direct current high-voltage pack is grounded; the high-voltage sinusoidal wave power supply is provided with a plurality of independent output ends, and each of the independent output ends is electrically connected with one of the high-voltage electrodes in one-to-one correspondence, and the grounding end of the high-voltage sinusoidal wave power supply is grounded with the low-voltage electrode and the corona negative electrode.

[0017] Optionally, the materials of the discharge needle, the corona negative electrode and the corona positive electrode are the same, and any one of copper, tungsten and graphite is used.

[0018] On the basis of the above technical solution, the disclosure further provides an excitation method based on the above rotating jet plasma excitation device, comprising the following steps:

[0019] Step S1, sending a start instruction from the intelligent control module to the power module to make the direct current high-voltage pack supply power to the corona discharge assembly, and make the high-voltage sinusoidal wave power supply enter a standby output state;

[0020] Step S2, applying direct current high voltage to the electrodes of the corona discharge assembly by the direct current high-voltage pack, forming a strong electric field between the electrodes to ionize air to generate a normal main jet along the normal direction of the jet hole;

[0021] Step S3, sending a time sequence control instruction from the intelligent control module to the high-voltage sinusoidal wave power supply to make each independent output end of the high-voltage sinusoidal wave power supply output a high-voltage sinusoidal signal to the corresponding dielectric barrier discharge unit in a preset direction to drive each dielectric barrier discharge unit to activate in turn and form a rotating air flow field around the normal main jet;

[0022] Step S4, using the superposition of the rotating airflow field and the normal main jet, a coupled composite rotating jet is generated to disturb and control the flow field of the surface of the carrier to be controlled;

[0023] Step S5, using a micro sensor array to collect flow field parameters in real time and feed back to the intelligent control module, the intelligent control module adjusts the output voltage of the direct current high voltage pack and the excitation timing and phase difference of the high voltage sinusoidal wave power supply according to the flow field parameters, and performs adaptive control of the flow field.

[0024] Optionally, the control logic of the preset direction in step S3 is that the intelligent control module delays the excitation trigger time of each dielectric barrier discharge unit in clockwise or counterclockwise order, wherein the delay duration matches the output frequency of the high voltage sinusoidal wave power supply.

[0025] Through the above technical solution, the rotating jet plasma excitation device of the present disclosure includes a dielectric barrier discharge assembly, a corona discharge assembly, and a power supply and control assembly. The dielectric barrier discharge assembly is coaxially arranged with the jet hole, which can ensure that the airflow generated by discharge is accurately matched with the output direction of the jet hole. The corona discharge assembly is arranged outside the dielectric barrier discharge assembly and opposite to the jet hole. A normal main jet is output to the jet hole through the corona discharge assembly, which can directly suppress the flow field separation near the wall surface. A single high voltage electrode and a single low voltage electrode of the dielectric barrier discharge assembly correspond to form an independent dielectric barrier discharge unit. The dielectric barrier discharge unit cooperates with the intelligent control module to control the signal of the power supply module, which can realize multi-directional airflow adjustment through timing adjustment, and form a rotating airflow field surrounding the normal main jet. Through the superposition of the rotating airflow field and the normal main jet, a coupled composite rotating jet is generated. The composite rotating jet can more effectively disrupt the coherence of the turbulent flow quasi-order structure, improve the suppression ability of the near-wall low-speed strip and the transition instability wave, and realize more efficient flow control.

[0026] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments section. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, which together with the following specific embodiments, serve to explain the present disclosure but do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 is a structural schematic diagram of the rotating jet plasma excitation device provided by the embodiments of the present disclosure;

[0029] Figure 2 is an exploded view of the rotating jet plasma excitation device provided by the embodiments of the present disclosure;

[0030] Figure 3is a structural schematic diagram of a dielectric barrier discharge assembly provided by an embodiment of the present disclosure;

[0031] Figure 4 is a structural schematic diagram of a discharge electrode provided by an embodiment of the present disclosure;

[0032] Figure 5 is a working state schematic diagram of a rotating jet plasma excitation device provided by an embodiment of the present disclosure.

[0033] Legend: 1, carrier; 11, carrier surface; 12, jet hole; 2, dielectric barrier discharge assembly; 21, insulating dielectric layer; 22, high-voltage electrode; 23, low-voltage electrode; 3, corona discharge assembly; 31, discharge electrode; 311, annular shell; 312, corona negative electrode; 313, corona positive electrode; 32, discharge needle; 4, power supply module; 41, direct current high-voltage pack; 42, high-voltage sinusoidal wave power supply; 5, intelligent control module; 6, micro sensor array. DETAILED DESCRIPTION

[0034] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0035] In the present disclosure, the positional words such as “inner” and “outer” are relative to the “inner” and “outer” of the corresponding component itself profile, unless otherwise stated. In addition, in the following description, the same reference numerals in different drawings represent the same or similar elements, unless otherwise explained, when referring to the drawings. The above definition is only for explaining and illustrating the present disclosure, and should not be understood as limiting the present disclosure.

[0036] According to the exemplary embodiments of the present disclosure, as Figures 1 to 5As shown, a rotating jet plasma excitation device is provided, comprising: a carrier 1, the carrier 1 having a carrier surface 11 for contacting a flow field to be controlled, at least one through jet hole 12 being formed on the carrier surface 11; a dielectric barrier discharge assembly 2, arranged on the side of the carrier surface 11 away from the flow field to be controlled and coaxially arranged with the jet hole 12, the dielectric barrier discharge assembly 2 being used for forming a rotating airflow field and comprising an insulating medium layer 21, a plurality of high-voltage electrodes 22 and a plurality of low-voltage electrodes 23, the insulating medium layer 21 being configured as a cylindrical structure, the plurality of low-voltage electrodes 23 being spaced and annularly arranged on the inner side of the insulating medium layer 21, the plurality of high-voltage electrodes 22 being spaced and annularly arranged on the outer side of the insulating medium layer 21, a single high-voltage electrode 22 and a single low-voltage electrode 23 corresponding to form an independent dielectric barrier discharge unit; a corona discharge assembly 3, sleeved on the outside of the dielectric barrier discharge assembly 2 and arranged opposite to the jet hole 12, used for outputting a normal main jet into the jet hole 12, the corona discharge assembly 3 comprising at least one pair of discharge electrodes 31, the at least one pair of discharge electrodes 31 being provided with a discharge structure for strengthening the ionization effect of the electric field; a power supply and control assembly, the power supply and control assembly comprising a power supply module 4 and an intelligent control module 5, the power supply module 4 being used for providing electric energy for the corona discharge assembly 3 and the dielectric barrier discharge assembly 2; the intelligent control module 5 being signal connected with the power supply module 4.

[0037] Through the above technical solution, the rotating jet plasma excitation device of the present disclosure comprises the dielectric barrier discharge assembly 2, the corona discharge assembly 3 and the power supply and control assembly, the dielectric barrier discharge assembly 2 is coaxially arranged with the jet hole 12, which can ensure that the airflow generated by discharge is accurately matched with the output direction of the jet hole 12; the corona discharge assembly 3 is sleeved on the outside of the dielectric barrier discharge assembly 2 and arranged opposite to the jet hole 12, a normal main jet is outputted into the jet hole 12 by the corona discharge assembly 3, which can directly suppress the separation of the near-wall flow field; a single high-voltage electrode 22 and a single low-voltage electrode 23 of the dielectric barrier discharge assembly 2 correspond to form an independent dielectric barrier discharge unit, the dielectric barrier discharge unit cooperates with the signal control of the intelligent control module 5 to the power supply module 4, which can realize multi-directional airflow adjustment through time sequence adjustment, and form a rotating airflow field surrounding the normal main jet, as shown in Figure 5 Through the superposition of the rotating airflow field and the normal main jet, a coupled composite rotating jet is generated, which can more effectively disrupt the coherence of the turbulent flow quasi-order structure, improve the suppression ability of the near-wall low-speed strip and the transition instability wave, and realize more efficient flow control.

[0038] In the above technical solution, the jet hole 12 is used to guide the airflow generated by the plasma excitation, the diameter of the jet hole 12 can be 5mm-15mm, for example, the diameter of the jet hole 12 can be set to 5mm or 10mm or 15mm, at the same time, the jet hole 12 can be configured as a circular hole, of course, the jet hole 12 can also be set as a square hole or other shape of through hole according to actual needs, and the present disclosure does not make specific limitation here.

[0039] Wherein, the insulating medium layer 21 of the cylindrical structure plays a role of isolation and insulation, avoiding electrical interference between different electrodes; a single high-voltage electrode 22 corresponds to a single low-voltage electrode 23 to form an independent dielectric barrier discharge unit, which lays a foundation for flexible discharge control, and the discharge effect can be adjusted by controlling the activation state of different dielectric barrier discharge units.

[0040] The corona discharge assembly 3 is arranged outside the dielectric barrier discharge assembly 2 and opposite to the jet hole 12, and the core function of the corona discharge assembly 3 is to output the normal main jet into the jet hole 12. The discharge structure arranged on at least one pair of discharge electrodes 31 for strengthening the electric field ionization effect can enhance the electric field intensity between the electrodes, improve the air ionization efficiency, and ensure the stable generation of the normal main jet.

[0041] In the present disclosure, the power supply and control assembly includes a power supply module 4 and an intelligent control module 5, the power supply module 4 provides the required electric energy for the corona discharge assembly 3 and the dielectric barrier discharge assembly 2; the intelligent control module 5 is signal connected with the power supply module 4, and the output of the power supply module 4 can be adjusted by sending control instructions, so as to realize the precise control of the discharge process of the present rotating jet plasma excitation device.

[0042] According to the exemplary embodiments of the present disclosure, as shown in Figure 2 and Figure 4 The discharge structure can include a plurality of discharge needles 32, each discharge needle 32 is uniformly distributed along the circumference of the corresponding discharge electrode 31, and the needle tip of the discharge needle 32 faces the jet hole 12. Through the above setting, the electric field distribution between the electrodes can be more uniform, and by making the needle tip of the discharge needle 32 face the jet hole 12, the airflow generated by ionization can be accurately guided to the jet hole 12, ensuring that the normal main jet can be stably and efficiently output from the jet hole 12, further strengthening the electric field ionization effect and the directivity of the jet.

[0043] According to the exemplary embodiments of the present disclosure, referring to Figure 4As shown, each pair of discharge electrodes 31 comprises a ring-shaped shell 311, a corona negative electrode 312 and a corona positive electrode 313, the corona positive electrode 313 and the corona negative electrode 312 are both configured as a circular ring structure and are embedded at two ends of the ring-shaped shell 311 respectively, and the corona negative electrode 312 of each pair of discharge electrodes 31 is provided with a discharge structure, wherein the end face of the corona positive electrode 313 of the pair of discharge electrodes 31 close to the jet hole 12 is tightly attached to the jet hole 12. In the above technical solution, the ring-shaped shell 311 plays a role in fixing and supporting the electrodes, ensuring the relative position of the corona positive electrode 313 and the corona negative electrode 312 stable; at the same time, the circular ring structure of the corona positive electrode 313 and the corona negative electrode 312 can better match the jet hole 12, so that the electric field distribution is more in line with the shape of the jet hole 12, which is beneficial to the uniform output of the airflow.

[0044] In the present disclosure, the end face of the corona positive electrode 313 close to the jet hole 12 is tightly attached to the jet hole 12, so that the ionized airflow generated by the corona discharge can directly enter the jet hole 12 without passing through a long transmission path, greatly reducing the energy loss of the airflow during transmission, ensuring that the normal main jet can act on the flow field to be controlled with sufficient energy, improving the disturbance ability of the flow field, and more effectively suppressing the turbulence burst and delaying the boundary layer transition.

[0045] In the above technical solution, the ring-shaped shell 311 can be made of transparent acrylic material, or other insulating materials can be used according to requirements, to ensure the stability and electrical insulation performance of the corona discharge assembly 3.

[0046] According to the exemplary embodiments of the present disclosure, the distance between the corona negative electrode 312 and the corona positive electrode 313 of each pair of discharge electrodes 31 can be 3mm-6mm, for example, the distance between the corona negative electrode 312 and the corona positive electrode 313 of each pair of discharge electrodes 31 can be set to 3mm or 5mm or 6mm, to avoid too large distance, so that the electric field strength between the electrodes is insufficient, it is difficult to effectively ionize the air, and ensure that the normal main jet with sufficient strength is generated; the inner diameter of the corona positive electrode 313 is 1mm-2mm smaller than the hole diameter of the jet hole 12, and the outer diameter of the corona negative electrode 312 is 3mm-5mm smaller than the diameter of the jet hole 12, for example, the inner diameter of the corona positive electrode 313 can be set to be 1mm or 1.5mm or 2mm smaller than the hole diameter of the jet hole 12; the outer diameter of the corona negative electrode 312 can be set to be 3mm or 4mm or 5mm smaller than the diameter of the jet hole 12, by setting in this way, the discharge area of the corona positive electrode 313 can be completely located within the projection range of the jet hole 12, avoiding the edge electric field concentration, and improving the discharge stability.

[0047] According to the example embodiment of the present disclosure, the material of the discharge needle 32, the corona negative electrode 312 and the corona positive electrode 313 is the same, and is made of any one of copper, tungsten and graphite. By unifying the material, processing is facilitated, and the electrochemical properties of each conductive part are matched to avoid galvanic corrosion or potential difference problems that may occur when different materials are in contact.

[0048] With reference to Figure 3 The dielectric barrier discharge assembly 2 of the present disclosure has a cylindrical structure surrounding the jet flow hole 12, and is used to excite a controllable rotational flow plasma jet in the plane, that is, the corona positive electrode 313 is used to generate a rotational flow to participate in the regulation of the normal main jet.

[0049] According to the example embodiment of the present disclosure, the insulating medium layer 21 can be made of a polyimide film or an aluminum oxide ceramic material. The polyimide film is a flexible material, which is convenient to make into a cylindrical shape, and has excellent insulation performance and high temperature resistance, and can adapt to temperature changes and vibration environments during the flight of the aircraft. The aluminum oxide ceramic sheet has high strength, high insulation and good high temperature stability, and can improve the durability of the insulating medium layer 21.

[0050] The thickness of the insulating medium layer 21 is 0.05mm-0.5mm. For example, the thickness of the insulating medium layer 21 can be 0.05mm, 0.18mm or 0.5mm. The thickness of 0.05mm-0.5mm can ensure sufficient insulation strength to prevent breakdown discharge between electrodes, and will not cause excessive discharge energy loss due to excessive thickness, affecting the discharge effect.

[0051] In the present disclosure, the high-voltage electrode 22 and the low-voltage electrode 23 can be made of copper foil material, and the thickness is 0.01mm-0.1mm. The width of the high-voltage electrode 22 is 0.8mm-1.2mm. For example, the width of the high-voltage electrode 22 can be 0.8mm, 1mm or 1.2mm. The width of the low-voltage electrode 23 is 1.8mm-2.2mm. For example, the width of the low-voltage electrode 23 can be 1.8mm, 2mm or 2.2mm. The spacing between adjacent two high-voltage electrodes 22 and adjacent two low-voltage electrodes 23 is 4mm-5mm. For example, the spacing between adjacent two high-voltage electrodes 22 can be 4mm, 4.5mm or 5mm, and the spacing between adjacent two low-voltage electrodes 23 can also be 4mm, 4.5mm or 5mm. The specific spacing can be flexibly set according to the required jet speed.

[0052] In addition, it should be noted that in actual application, the width of the high-voltage electrode 22 can be minimized to improve the excitation efficiency under the premise of ensuring the durability of the electrode.

[0053] According to the example embodiment of the present disclosure, as shown in Figure 1 、 Figure 2 and Figure 5 , the rotating jet plasma excitation device can further include a micro sensor array 6 arranged on the carrier surface 11 and in signal connection with the intelligent control module 5; the micro sensor array 6 is used to collect and feed back the flow velocity, shear stress and flow field separation state parameters of the flow field to the control assembly, and the micro sensor array 6 includes a hot film anemometer and a MEMS pressure sensor. In the above technical solution, the micro sensor array 6 is directly arranged on the carrier surface 11, and can collect the flow velocity, shear stress and flow field separation state and other key parameters of the flow field in real time, so that the intelligent control module 5 can timely master the dynamic changes of the flow field; the signal connection of the sensor array and the intelligent control module 5 enables the flow field parameters to be fed back to the intelligent control module 5 in real time, and the intelligent control module 5 can adjust the output of the power module 4 according to the feedback parameters, thereby changing the working state of the discharge assembly, and realizing self-adaptive control of the rotating flow field. Such self-adaptive capability can effectively cope with the significant differences in flow field parameters at different flight stages and the dynamic instability phenomena (such as turbulence burst and low-speed strip evolution) in the flow field, greatly improving the adaptability of the rotating jet plasma excitation device to complex flow fields, reducing the fluctuation of control effect under different working conditions, and better meeting the needs of the aircraft for efficient and accurate flow control.

[0054] According to the example embodiment of the present disclosure, as shown in Figure 5 , the power module 4 includes a direct current high voltage pack 41 and a high voltage sine wave power supply 42, the output end of the direct current high voltage pack 41 is electrically connected with the corona positive electrode 313, the ground end of the direct current high voltage pack 41 is grounded, the direct current high voltage pack 41 can provide stable direct current high voltage to provide the required electric energy for the corona discharge assembly 3 to generate the required normal main jet; the high voltage sine wave power supply 42 is provided with a plurality of independent output ends, and the plurality of independent output ends are respectively and correspondingly electrically connected with each high voltage electrode 22, and the ground end of the high voltage sine wave power supply 42 is grounded with the low voltage electrode 23 and the corona negative electrode 312. The arrangement of the plurality of independent output ends can realize independent power supply control of each high voltage electrode 22, thereby controlling the activation state of the corresponding dielectric barrier discharge unit.

[0055] In the present disclosure, the direct current high voltage pack 41 is used to supply power to the corona discharge assembly 3 alone, the high voltage sine wave power supply 42 is used to supply power to the dielectric barrier discharge assembly 2 alone, and the power supply types (direct current, sine wave) of the two are precisely matched with the discharge requirements of each assembly, the corona discharge requires stable direct current high voltage to ensure the strength of the normal main jet, and the dielectric barrier discharge requires sine wave to realize dynamic activation, thereby greatly improving the stability and effectiveness of the discharge of each corona discharge assembly 3 and dielectric barrier discharge assembly 2.

[0056] Please refer to Figures 1 to 5The rotating jet plasma excitation device of the present disclosure is assembled as follows during assembly:

[0057] First, the low-voltage electrode 23 is tightly attached to the inner side of the insulating medium layer 21, ensuring that there is no gap between the two to ensure good electrical contact and structural stability;

[0058] Next, the high-voltage electrode 22 is tightly attached to the outer side of the insulating medium layer 21, and the lower edge of the high-voltage electrode 22 is aligned with the lower edge of the low-voltage electrode 23, while the upper edge of the high-voltage electrode 22 is aligned with the upper edge of the low-voltage electrode 23, thereby forming a uniform electric field distribution, and the assembly of the dielectric barrier discharge component 2 is completed;

[0059] After that, the assembled dielectric barrier discharge component 2 is installed on the carrier surface 11 away from the side of the flow field to be controlled, and the dielectric barrier discharge component 2 is coaxial with the jet hole 12;

[0060] Then assemble the discharge electrode 31, specifically, refer to Figure 4 The corona positive electrode 313 and the corona negative electrode 312 are respectively installed at both ends of the annular shell 311, and here, a clamping groove can be formed inside both ends of the annular shell 311, and the corona positive electrode 313 and the corona negative electrode 312 are connected with the annular shell 311 by clamping to form the discharge electrode 31. The required number of discharge electrodes 31 are assembled by the above-mentioned method, and each discharge electrode 31 is coaxial and connected in sequence, as shown in Figure 2 to form the corona discharge component 3;

[0061] After that, the corona discharge component 3 is assembled with the carrier 1 and the dielectric barrier discharge component 2, specifically, the corona discharge component 3 is sleeved on the dielectric barrier discharge component 2, and the end face of the corona positive electrode 313 of the corona discharge component 3 is tightly attached to the jet hole 12, so that the corona discharge component 3 is coaxially installed with the jet hole 12. Here, a positioning step can be provided on the carrier 1 to achieve coaxial installation of the corona discharge component 3 with the jet hole 12. Of course, the cooperation of positioning pins and positioning holes can also be used to achieve coaxial installation, and the present disclosure does not make specific limitations in this regard.

[0062] Finally, the corona positive electrode 313 is electrically connected with the output end of the DC high-voltage pack 41, the ground end of the DC high-voltage pack 41 is grounded, and the multiple independent output ends of the high-voltage sinusoidal wave power supply 42 are respectively electrically connected with each high-voltage electrode 22 one by one, and the ground end of the high-voltage sinusoidal wave power supply 42 is also grounded. The control input ends of the DC high-voltage pack 41 and the high-voltage sinusoidal wave power supply 42 are connected with the signal output end of the intelligent control module 5 to realize accurate regulation and control of the excitation parameters. Thus, the installation of the rotating jet plasma excitation device is completed, as shown in Figure 5 .

[0063] On the basis of the above technical solutions, the disclosure also provides an excitation method based on the above rotating jet plasma excitation device, comprising the following steps:

[0064] Step S1, send a start instruction to the power module 4 through the intelligent control module 5, so that the DC high voltage pack 41 supplies power to the corona discharge assembly 3, and the high-voltage sinusoidal wave power supply 42 enters a standby output state;

[0065] Step S2, apply a DC high voltage to the electrodes of the corona discharge assembly 3 by using the DC high voltage pack 41, and form a strong electric field between the electrodes to ionize the air, so as to generate a normal main jet along the normal direction of the jet hole 12;

[0066] Step S3, send a time sequence control instruction to the high-voltage sinusoidal wave power supply 42 through the intelligent control module 5, so that each independent output end of the high-voltage sinusoidal wave power supply 42 outputs a high-voltage sinusoidal signal to the corresponding dielectric barrier discharge unit in a predetermined direction, so as to drive each dielectric barrier discharge unit to activate in turn and form a rotating airflow field surrounding the normal main jet;

[0067] Step S4, utilize the superposition of the rotating airflow field and the normal main jet to generate a coupled composite rotating jet, so as to disturb and control the flow field of the carrier surface 11;

[0068] Step S5, use the micro sensor array 6 to collect flow field parameters in real time and feed back to the intelligent control module 5, and the intelligent control module 5 adjusts the output voltage of the DC high voltage pack 41 and the excitation time sequence and phase difference of the high-voltage sinusoidal wave power supply 42 according to the flow field parameters, and performs adaptive control on the flow field.

[0069] In the above technical solutions, the phase difference range can be adjusted according to the flow field separation degree, and the control logic of the predetermined direction in step S3 is that the intelligent control module 5 delays the excitation trigger time of each dielectric barrier discharge unit in a clockwise or counterclockwise order, and the delay time is matched with the output frequency of the high-voltage sinusoidal wave power supply 42.

[0070] Please refer to Figures 1 to 5 The working process of the rotating jet plasma excitation device of the disclosure is described as follows:

[0071] Under the control of the intelligent control module 5, the DC high voltage pack 41 is started, and a stable DC high voltage (the voltage value can be-10kV to-20kV) is applied between the corona negative electrode 312 and the corona positive electrode 313 of the corona discharge assembly 3, so as to establish a strong electric field along the z direction (i.e. normal direction) between the corona negative electrode 312 and the corona positive electrode 313 (such as Figure 5As shown in the figure), the electric field ionizes air molecules to form stable corona discharge, and the generated negative ions are accelerated from the negative electrode to the positive electrode under the action of the electric field, frequently collide with neutral gas molecules and transfer momentum, thereby inducing the generation of a continuous upward normal main jet in the jet hole 12, serving as the basis flow for flow control;

[0072] At the same time, the intelligent control module 5 controls the high-voltage sine wave power supply 42 to make the high-voltage sine wave power supply 42 apply a high-frequency high-voltage sine signal (the voltage range can be kV3 to 10kV, and the frequency can be 1kHz-10kHz) between the multiple groups of high-voltage electrodes 22 and low-voltage electrodes 23, and under the restriction of the insulating medium layer 21, independent dielectric barrier discharge units are generated between the high-voltage electrodes 22 and the corresponding low-voltage electrodes 23, forming plasma wind along the wall surface direction, i.e., forming a rotating jet. By adjusting the excitation timing of each channel through the intelligent control module 5, the dielectric barrier discharge units of each group are activated in a clockwise or counterclockwise sequence, and a continuous rotating airflow field is constructed;

[0073] The rotating airflow field produces a drag effect on the normal main jet located in the central region and causes it to be spirally twisted through angular momentum superposition, and finally fuses to form a composite rotating jet with both normal penetration and circumferential rotation momentum. The composite rotating jet can significantly enhance the disturbance ability of the boundary layer low-speed strip, turbulence burst and other quasi-ordered structures, effectively suppress flow separation, and improve the transition delay and drag reduction effect.

[0074] In the above process, the micro sensor array 6 monitors parameters such as flow rate, shear stress, separation state in real time and transmits signals to the intelligent control module 5, wherein the intelligent control module 5 can be built-in PID (a widely used engineering control technology that adjusts system errors through proportional, integral, and differential control to achieve precise control), fuzzy logic or machine learning algorithm, analyzes the flow field state in real time, and dynamically adjusts the activation sequence, phase difference and voltage amplitude of the dielectric barrier discharge assembly unit when detecting flow instability (such as separation precursor or turbulence enhancement), and independently adjusts the direct current voltage to control the normal main jet intensity. At the same time, the intelligent control module 5 can also adaptively adjust the excitation frequency according to the incoming flow velocity to match the boundary layer instability wave and achieve efficient resonance control. The entire closed-loop response described above can be completed in milliseconds, ensuring the timeliness and adaptability of control, and greatly improving the energy utilization efficiency and control efficiency under complex working conditions.

[0075] In summary, the rotating jet plasma excitation device of the present disclosure can take the corona discharge as the main source to generate a high-momentum normal main jet, wherein the dielectric barrier discharge assembly 2 is used to generate a low-energy wall-attached induced flow, i.e., a rotating jet, which is mainly used to regulate the rotating characteristics of the normal main jet and does not need to undertake the main energy output task. Therefore, the present disclosure can greatly reduce the overall energy consumption while ensuring strong excitation capability through the synergistic mechanism of the dielectric barrier discharge assembly 2 and the corona discharge assembly 3, and significantly improve the energy conversion efficiency and excitation benefit of the system.

[0076] In addition, the present disclosure is based on a pure electric driving plasma discharge mechanism, without mechanical moving parts, gas sources or gas introduction pipelines. The discharge establishment time can reach microseconds, with extremely fast response speed. Through the time sequence regulation of the intelligent control module 5 on the multi-channel high-voltage power supply, the rotating direction (clockwise, counterclockwise), rotating frequency and intensity can be switched in real time, supporting wide-band control from quasi-static to high-frequency unsteady excitation, which can flexibly adapt to the complex flow changes of the aircraft under different working conditions, and is especially suitable for scenes such as turbulent flow drag reduction and boundary layer transition control which have extremely high requirements for dynamic response.

[0077] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Within the technical concept range of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection range of the present disclosure.

[0078] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again by the present disclosure.

[0079] In addition, various different embodiments of the present disclosure can also be combined in any manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A rotating jet plasma excitation device, characterized in that, include: The carrier (1) has a carrier surface (11) for contacting the flow field to be controlled, and at least one through jet hole (12) is provided on the carrier surface (11). A dielectric barrier discharge assembly (2) is disposed on the side of the carrier surface (11) away from the flow field to be controlled and is coaxially arranged with the jet hole (12). The dielectric barrier discharge assembly (2) is used to form a rotating airflow field and includes an insulating dielectric layer (21), a plurality of high-voltage electrodes (22) and a plurality of low-voltage electrodes (23). The insulating dielectric layer (21) is constructed as a cylindrical structure. The plurality of low-voltage electrodes (23) are spaced apart and arranged in a ring around the inner side of the insulating dielectric layer (21). The plurality of high-voltage electrodes (22) are spaced apart and arranged in a ring around the outer side of the insulating dielectric layer (21). Each high-voltage electrode (22) and each low-voltage electrode (23) corresponds to form an independent dielectric barrier discharge unit. The corona discharge assembly (3) is sleeved outside the dielectric barrier discharge assembly (2) and arranged opposite to the jet hole (12) for outputting a normal main jet into the jet hole (12). The corona discharge assembly (3) includes at least one pair of discharge electrodes (31), and the at least one pair of discharge electrodes (31) is provided with a discharge structure for enhancing the ionization effect of the electric field. The power supply and control component includes a power module (4) and an intelligent control module (5). The power module (4) is used to provide power to the corona discharge component (3) and the dielectric barrier discharge component (2). The intelligent control module (5) is signal connected to the power module (4).

2. The rotating jet plasma excitation device according to claim 1, characterized in that, The discharge structure includes a plurality of discharge needles (32), each of the discharge needles (32) being uniformly distributed circumferentially along the corresponding discharge electrode (31), and the tip of the discharge needle (32) facing the jet hole (12).

3. The rotating jet plasma excitation device according to claim 2, characterized in that, Each pair of discharge electrodes (31) includes an annular shell (311), a corona negative electrode (312), and a corona positive electrode (313). The corona positive electrode (313) and the corona negative electrode (312) are both constructed as a ring structure and are respectively embedded at both ends of the annular shell (311). Each pair of discharge electrodes (31) has a discharge structure on the corona negative electrode (312). The end face of the corona positive electrode (313) of the pair of discharge electrodes (31) near the jet hole (12) is in close contact with the jet hole (12).

4. The rotating jet plasma excitation device according to claim 3, characterized in that, The distance between the corona negative electrode (312) and the corona positive electrode (313) of each pair of discharge electrodes (31) is 3mm to 6mm; the inner diameter of the corona positive electrode (313) is 1mm to 2mm smaller than the diameter of the jet hole (12), and the outer diameter of the corona negative electrode (312) is 3mm to 5mm smaller than the diameter of the jet hole (12).

5. The rotating jet plasma excitation device according to claim 4, characterized in that, The insulating dielectric layer (21) is made of polyimide film or alumina ceramic material, and the thickness of the insulating dielectric layer (21) is 0.05mm to 0.5mm. Both the high-voltage electrode (22) and the low-voltage electrode (23) are made of copper foil, and their thickness is 0.01 mm to 0.1 mm. The width of the high-voltage electrode (22) is 0.8mm to 1.2mm, the width of the low-voltage electrode (23) is 1.8mm to 2.2mm, and the distance between two adjacent high-voltage electrodes (22) and two adjacent low-voltage electrodes (23) is 4mm to 5mm.

6. The rotating jet plasma excitation device according to claim 4, characterized in that, The rotating jet plasma excitation device also includes a micro sensor array (6), which is disposed on the carrier surface (11) and is connected to the intelligent control module (5) via signal. The micro sensor array (6) is used to collect and feed back the flow velocity, shear stress and flow field separation state parameters of the flow field to the control component. The micro sensor array (6) includes a hot film anemometer and a MEMS pressure sensor.

7. The rotating jet plasma excitation device according to claim 6, characterized in that, The power module (4) includes a DC high voltage transformer (41) and a high voltage sine wave power supply (42). The output terminal of the DC high voltage transformer (41) is electrically connected to the corona positive electrode (313), and the ground terminal of the DC high voltage transformer (41) is grounded. The high voltage sine wave power supply (42) has multiple independent output terminals, and the multiple independent output terminals are electrically connected to each of the high voltage electrodes (22) in a one-to-one correspondence. The ground terminal of the high voltage sine wave power supply (42) is grounded to the low voltage electrode (23) and the corona negative electrode (312).

8. The rotating jet plasma excitation device according to claim 7, characterized in that, The discharge needle (32), the corona negative electrode (312), and the corona positive electrode (313) are all made of the same material, and are made of any one of copper, tungsten, and graphite.

9. An excitation method based on the rotating jet plasma excitation device according to any one of claims 1-8, characterized in that, Includes the following steps: Step S1: Send a start command to the power module (4) through the intelligent control module (5) so that the DC high voltage transformer (41) supplies power to the corona discharge component (3) and the high voltage sine wave power supply (42) enters the standby output state; Step S2: Apply DC high voltage to the electrodes of the corona discharge assembly (3) using DC high voltage transformer (41). A strong electric field is formed between the electrodes to ionize the air and generate a normal main jet along the normal direction of the jet hole (12). Step S3: Send timing control commands to the high-voltage sinusoidal power supply (42) through the intelligent control module (5) so that each independent output terminal of the high-voltage sinusoidal power supply (42) outputs high-voltage sinusoidal signals to the corresponding dielectric barrier discharge unit in a preset direction, thereby driving each dielectric barrier discharge unit to activate in sequence and forming a rotating airflow field surrounding the normal main jet. Step S4: By superimposing the rotating airflow field and the normal main jet, a coupled composite rotating jet is generated to disturb and control the flow field to be controlled on the carrier surface (11). Step S5: The flow field parameters are collected in real time using a micro-sensor array (6) and fed back to the intelligent control module (5). The intelligent control module (5) adjusts the output voltage of the DC high voltage transformer (41) and the excitation timing and phase difference of the high voltage sine wave power supply (42) according to the flow field parameters to perform adaptive control of the flow field.

10. The excitation method of the rotating jet plasma excitation device according to claim 9, characterized in that, The control logic for the preset direction in step S3 is as follows: the intelligent control module (5) delays the excitation trigger time of each dielectric barrier discharge unit in a clockwise or counterclockwise order, wherein the delay duration is matched with the output frequency of the high-voltage sine wave power supply (42).

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