Rotary jet plasma excitation device and method

Abstract

The invention relates to a rotary jet plasma excitation device and method, and the device comprises a carrier which is provided with a jet hole in the surface; the dielectric barrier discharge assembly is arranged on the surface of the carrier, is coaxial with the jet hole and comprises an insulating dielectric layer, a plurality of high-voltage electrodes and a plurality of low-voltage electrodes, the low-voltage electrodes and the high-voltage electrodes are annularly arranged on the inner side and the outer side of the insulating dielectric layer at intervals, and the single high-voltage electrode and the single low-voltage electrode correspondingly form an independent dielectric barrier discharge unit; the corona discharge assembly is arranged outside the dielectric barrier discharge assembly in a sleeving mode and used for outputting normal main jet flow into the jet flow hole, the corona discharge assembly comprises at least one pair of discharge electrodes, and the at least one pair of discharge electrodes are provided with discharge structures; and the power supply and control assembly comprises a power supply module and an intelligent control module. The rotary jet plasma excitation device can form composite rotary jet, effectively disrupts coherence of a turbulent coherent structure, and realizes efficient flow control.

Description

Technical Field

[0001] This disclosure relates to the field of plasma flow control technology, and more specifically, to a rotating jet plasma excitation device and method. Background Technology

[0002] In the field of aerospace engineering, improving aircraft lift and reducing drag are core requirements for ensuring flight efficiency and economy. As the aerospace industry continues to demand higher flight performance, traditional approaches relying on aerodynamic shape optimization (such as wing profile design and winglet installation) are gradually approaching their physical performance bottlenecks, making it difficult to further improve energy efficiency and aerodynamic performance. Against this backdrop, active flow control technology, which can dynamically adapt to flow field changes during takeoff, cruise, and landing by intervening in flow field behavior in real time, has become a key research direction for further improving aircraft aerodynamic performance. Among these, plasma excitation technology, as an important branch of active flow control, demonstrates promising application prospects in core scenarios such as turbulent friction drag reduction and boundary layer transition control due to its significant advantages, including fast response speed, no need for mechanical moving parts, and ease of integration with aircraft surfaces. However, in actual aircraft applications, the flow field environment is highly complex and nonlinear: on the one hand, the flow field parameters differ significantly in different flight stages (such as the low Reynolds number flow field during takeoff and the high Reynolds number flow field during cruise); on the other hand, there are dynamic instabilities such as turbulent bursts and low-speed strip evolution within the flow field, which impose stringent requirements on the dynamic response speed, disturbance direction flexibility and energy utilization efficiency of flow control technology. Existing plasma excitation devices fall short of meeting these requirements, primarily due to two issues: First, the jet direction is unidirectional; most plasma excitation devices can only generate normal or horizontal jets in a fixed direction, unable to adjust the disturbance angle according to changes in the flow field, thus failing to comprehensively cover the intervention needs of complex flow fields. Second, they lack dynamic rotational characteristics; the jet morphology is mostly statically distributed, unable to disrupt the coherence of the turbulent quasi-sequential structure through rotational motion, resulting in limited suppression of low-velocity stripes near the wall. These deficiencies make it difficult for existing plasma excitation devices to effectively suppress turbulent bursts and delay boundary layer transitions. The flow control performance fluctuates significantly under different flight conditions, failing to reliably meet the aircraft's requirements for efficient and precise flow control. Summary of the Invention

[0003] The purpose of this disclosure is to provide a rotating jet plasma excitation device that can form a composite rotating jet, more effectively disrupting the coherence of turbulent pseudo-sequence structures and achieving more efficient flow control.

[0004] To achieve the above objectives, this disclosure provides a rotating jet plasma excitation device, comprising: The carrier has a carrier surface for contacting the flow field to be controlled, and at least one through jet hole is formed on the carrier surface. A dielectric barrier discharge assembly is disposed on the side of the carrier surface away from the flow field to be controlled and coaxially arranged with the jet orifice. The dielectric barrier discharge assembly is used to form a rotating airflow field and includes an insulating dielectric layer, multiple high-voltage electrodes and multiple low-voltage electrodes. The insulating dielectric layer is constructed in a cylindrical structure. The multiple low-voltage electrodes are spaced apart and arranged in a ring around the inner side of the insulating dielectric layer. The multiple high-voltage electrodes are spaced apart and arranged in a ring around the outer side of the insulating dielectric layer. Each high-voltage electrode and each low-voltage electrode corresponds to form an independent dielectric barrier discharge unit. A corona discharge assembly is sleeved outside the dielectric barrier discharge assembly and arranged opposite to the jet hole for outputting a normal main jet into the jet hole. The corona discharge assembly includes at least one pair of discharge electrodes, and the at least one pair of discharge electrodes are provided with a discharge structure for enhancing the ionization effect of the electric field. The power supply and control component includes a power module and an intelligent control module. The power module provides electrical energy to the corona discharge component and the dielectric barrier discharge component. The intelligent control module is signal-connected to the power module.

[0005] Optionally, the discharge structure includes a plurality of discharge needles, each of which is uniformly distributed circumferentially along the corresponding discharge electrode, and the tip of the discharge needle faces the jet hole.

[0006] Optionally, each pair of discharge electrodes includes an annular shell, a corona negative electrode, and a corona positive electrode. The corona positive electrode and the corona negative electrode are both constructed as annular structures and are respectively embedded at both ends of the annular shell. Each pair of discharge electrodes has a discharge structure on its corona negative electrode. The corona positive electrode end face of the pair of discharge electrodes near the jet hole is in close contact with the jet hole.

[0007] Optionally, the distance between the corona negative electrode and the corona positive electrode of each pair of discharge electrodes is 3mm to 6mm; the inner diameter of the corona positive electrode is 1mm to 2mm smaller than the diameter of the jet hole, and the outer diameter of the corona negative electrode is 3mm to 5mm smaller than the diameter of the jet hole.

[0008] Optionally, the insulating dielectric layer is made of polyimide film or alumina ceramic material, and the thickness of the insulating dielectric layer is 0.05mm to 0.5mm; both the high-voltage electrode and the low-voltage electrode are made of copper foil material, and the thickness of both is 0.01mm to 0.1mm; the width of the high-voltage electrode is 0.8mm to 1.2mm, the width of the low-voltage electrode is 1.8mm to 2.2mm, and the spacing between two adjacent high-voltage electrodes and two adjacent low-voltage electrodes is 4mm to 5mm.

[0009] Optionally, the rotating jet plasma excitation device further includes a micro-sensor array disposed on the surface of the carrier and connected to the intelligent control module via signal connection; 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 component, and the micro-sensor array includes a hot film anemometer and a MEMS pressure sensor (a sensor manufactured based on microelectromechanical systems technology).

[0010] Optionally, the power module includes a DC high-voltage transformer and a high-voltage sine wave power supply. The output terminal of the DC high-voltage transformer is electrically connected to the positive corona electrode, and the ground terminal of the DC high-voltage transformer is grounded. The high-voltage sine wave power supply has multiple independent output terminals, and each of the multiple independent output terminals is electrically connected to each of the high-voltage electrodes. The ground terminal of the high-voltage sine wave power supply is grounded to both the low-voltage electrode and the negative corona electrode.

[0011] Optionally, the discharge needle, the corona negative electrode, and the corona positive electrode are all made of the same material, and are made of any one of copper, tungsten, and graphite.

[0012] Based on the above technical solutions, this disclosure also provides an excitation method for the above-mentioned rotating jet plasma excitation device, comprising the following steps: Step S1: Send a start command to the power module through the intelligent control module to enable the DC high voltage transformer to supply power to the corona discharge component, and the high voltage sine wave power supply enters the standby output state. Step S2: Apply a DC high voltage to the electrodes of the corona discharge assembly using a DC high voltage transformer. 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. Step S3: Send timing control commands to the high-voltage sinusoidal power supply through the intelligent control module, so that each independent output terminal of the high-voltage sinusoidal power supply outputs high-voltage sinusoidal signals to the corresponding dielectric barrier discharge unit in a preset direction in sequence, so as to drive each dielectric barrier discharge unit to be activated in sequence and form a rotating airflow field surrounding the normal main jet. Step S4: By superimposing the rotating airflow field with 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. Step S5: Real-time acquisition of flow field parameters using a micro-sensor array and feedback to the intelligent control module. The intelligent control module adjusts the output voltage of the DC high-voltage transformer and the excitation timing and phase difference of the high-voltage sinusoidal power supply according to the flow field parameters to perform adaptive control of the flow field.

[0013] Optionally, the control logic for the preset direction in step S3 is as follows: the excitation triggering time of each dielectric barrier discharge unit is delayed by the intelligent control module in a clockwise or counterclockwise order, wherein the delay duration is matched with the output frequency of the high-voltage sinusoidal power supply.

[0014] Through the above technical solution, the rotating jet plasma excitation device disclosed herein 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 orifice, ensuring that the airflow generated by the discharge is precisely matched with the output direction of the jet orifice. The corona discharge assembly is sleeved outside the dielectric barrier discharge assembly and arranged opposite to the jet orifice. By outputting a normal main jet to the jet orifice through the corona discharge assembly, the near-wall flow field separation can be directly suppressed. Each high-voltage electrode and each low-voltage electrode of the dielectric barrier discharge assembly form an independent dielectric barrier discharge unit. The dielectric barrier discharge unit, in conjunction with the intelligent control module, controls the signal of the power supply module, enabling multi-directional airflow regulation through timing adjustment, and forming 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. This composite rotating jet can more effectively disrupt the coherence of the turbulent pseudo-sequence structure, improve the suppression capability of low-velocity stripes and transitional unstable waves near the wall, and achieve more efficient flow control.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the rotating jet plasma excitation device provided in the embodiments of this disclosure; Figure 2 This is an exploded view of the rotating jet plasma excitation device provided in the embodiments of this disclosure; Figure 3 This is a schematic diagram of the structure of the dielectric barrier discharge assembly provided in the embodiments of this disclosure; Figure 4This is a schematic diagram of the structure of the discharge electrode provided in the embodiments of this disclosure; Figure 5 This is a schematic diagram of the working state of the rotating jet plasma excitation device provided in the embodiments of this disclosure.

[0017] Explanation of reference numerals in the attached drawings: 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 module; 41. DC high-voltage transformer; 42. High-voltage sine wave power supply; 5. Intelligent control module; 6. Miniature sensor array. Detailed Implementation

[0018] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0019] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" are used relative to the contour of the corresponding component itself. Furthermore, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0020] According to exemplary embodiments of this disclosure, such as Figures 1 to 5As shown, a rotating jet plasma excitation device is provided, comprising: a carrier 1 having a carrier surface 11 for contacting a flow field to be controlled, and at least one through jet hole 12 formed on the carrier surface 11; and a dielectric barrier discharge assembly 2 disposed 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 is used to form a rotating gas flow 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 in 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, and the plurality of high-voltage electrodes 22 are spaced apart and arranged in a ring around the insulating dielectric layer. On the outside of 21, a single high-voltage electrode 22 and a single low-voltage electrode 23 form an independent dielectric barrier discharge unit; a corona discharge assembly 3 is sleeved on the outside of 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; a power supply and control assembly includes a power module 4 and an intelligent control module 5. The power module 4 is used to provide power to the corona discharge assembly 3 and the dielectric barrier discharge assembly 2; the intelligent control module 5 is signal connected to the power module 4.

[0021] Through the above technical solution, the rotating jet plasma excitation device disclosed herein includes a dielectric barrier discharge assembly 2, a corona discharge assembly 3, and a power supply and control assembly. The dielectric barrier discharge assembly 2 is coaxially arranged with the jet hole 12, ensuring precise matching between the airflow generated by the discharge and the output direction of the jet hole 12. The corona discharge assembly 3 is sleeved outside the dielectric barrier discharge assembly 2 and arranged opposite to the jet hole 12. By outputting the normal main jet to the jet hole 12 through the corona discharge assembly 3, the near-wall flow field separation can be directly suppressed. Each high-voltage electrode 22 and each low-voltage electrode 23 of the dielectric barrier discharge assembly 2 form an independent dielectric barrier discharge unit. The dielectric barrier discharge unit, in conjunction with the intelligent control module 5, controls the signal of the power supply module 4, enabling multi-directional airflow adjustment through timing adjustment and forming a rotating airflow field surrounding the normal main jet. Figure 5 As shown, a coupled composite rotating jet is generated by superimposing the rotating airflow field with the normal main jet. This composite rotating jet can more effectively disrupt the coherence of the turbulent pseudo-sequence structure, improve the suppression of low-velocity strips and transitional unstable waves near the wall, and achieve more efficient flow control.

[0022] In the above technical solution, the jet hole 12 is used to conduct the airflow generated by plasma excitation. The diameter of the jet hole 12 can be 5mm to 15mm. For example, the diameter of the jet hole 12 can be set to 5mm, 10mm or 15mm. At the same time, the jet hole 12 can be constructed as a circular hole. Of course, the jet hole 12 can also be set as a square hole or other shaped through hole according to actual needs. This disclosure does not impose any specific limitations on this.

[0023] The cylindrical insulating dielectric layer 21 serves as an isolation and insulation layer to prevent electrical interference between different electrodes. Each high-voltage electrode 22 and each low-voltage electrode 23 form an independent dielectric barrier discharge unit. The independent dielectric barrier discharge unit lays the foundation for flexible discharge control. The discharge effect can be adjusted by controlling the activation state of different dielectric barrier discharge units.

[0024] The corona discharge assembly 3 is mounted outside the dielectric barrier discharge assembly 2 and is arranged opposite to the jet hole 12. The core function of the corona discharge assembly 3 is to output the normal main jet into the jet hole 12. The discharge structure set on at least one pair of discharge electrodes 31 to enhance the electric field ionization effect can enhance the electric field strength between the electrodes, improve the air ionization efficiency, and ensure the stable generation of the normal main jet.

[0025] In this disclosure, the power supply and control components include a power module 4 and an intelligent control module 5. The power module 4 provides the required electrical energy 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 and can adjust the output of the power module 4 by sending control commands, thereby achieving precise control of the discharge process of this rotating jet plasma excitation device.

[0026] According to exemplary embodiments of this disclosure, such as Figure 2 and Figure 4 As shown, the discharge structure may include multiple discharge needles 32, each of which is uniformly distributed circumferentially along the corresponding discharge electrode 31, with the tip of the discharge needle 32 facing the jet hole 12. This arrangement enables a more uniform electric field distribution between the electrodes. By directing the tip of the discharge needle 32 towards the jet hole 12, the ionized gas flow can be precisely guided to the jet hole 12, ensuring that the normal main jet can be stably and efficiently output from the jet hole 12, further enhancing the electric field ionization effect and the directionality of the jet.

[0027] According to exemplary embodiments of this disclosure, referring to Figure 4As shown, 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 corona negative electrode 312 are both constructed as rings and are respectively embedded at both ends of the annular shell 311. Each pair of discharge electrodes 31 has a discharge structure on its corona negative electrode 312. Specifically, the end face of the corona positive electrode 313 of the pair of discharge electrodes 31 closest to the jet hole 12 is tightly attached to the jet hole 12. In the above technical solution, the annular shell 311 serves to fix and support the electrodes, ensuring the relative position of the corona positive electrode 313 and corona negative electrode 312 is stable. Simultaneously, the annular structure of the corona positive electrode 313 and corona negative electrode 312 allows for better matching with the jet hole 12, making the electric field distribution more consistent with the shape of the jet hole 12, which is beneficial for uniform airflow output.

[0028] In this disclosure, the end face of the corona positive electrode 313 near the jet hole 12 is in close contact with the jet hole 12, so that the ionized gas flow generated by the corona discharge can directly enter the jet hole 12 without going through a long transmission path, which greatly reduces the energy loss of the gas flow during the transmission process, ensures that the normal main jet can act on the flow field to be controlled with sufficient energy, improves the disturbance capability of the convective flow field, and more effectively suppresses turbulent bursts and delays boundary layer transition.

[0029] In the above technical solution, the annular shell 311 can be made of transparent acrylic material, or other insulating materials can be used as needed to ensure the stability and electrical insulation performance of the corona discharge assembly 3.

[0030] According to an exemplary embodiment of this 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 to 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, 5mm, or 6mm to avoid excessive spacing, which would result in insufficient electric field strength between the electrodes, making it difficult to effectively ionize the air and ensuring the generation of a sufficiently strong normal main jet. The inner diameter of the corona positive electrode 313 is smaller than the aperture of the jet hole 12 by 1mm. The outer diameter of the corona negative electrode 312 is 3mm to 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, 1.5mm or 2mm smaller than the diameter of the jet hole 12. The outer diameter of the corona negative electrode 312 can be set to be 3mm, 4mm or 5mm smaller than the diameter of the jet hole 12. With this setting, the discharge area of ​​the corona positive electrode 313 can be completely located within the projection range of the jet hole 12, avoiding the concentration of the edge electric field and improving the discharge stability.

[0031] According to an exemplary embodiment of this disclosure, the discharge needle 32, the corona negative electrode 312, and the corona positive electrode 313 are all made of the same material, specifically copper, tungsten, and graphite. Using a uniform material facilitates processing and ensures the matching of electrochemical characteristics among the conductive components, avoiding galvanic corrosion or potential difference problems that may occur when different materials come into contact.

[0032] Reference Figure 3 The dielectric barrier discharge assembly 2 disclosed herein has an overall cylindrical structure surrounding the jet hole 12, which is used to excite a controllable swirling plasma jet in the plane. In other words, the corona positive electrode 313 is used to generate a rotating jet, thereby participating in the control of the normal main jet.

[0033] According to an exemplary embodiment of this disclosure, the insulating dielectric layer 21 can be made of polyimide film or alumina ceramic material. Polyimide film is a flexible material, which is easy to make into a cylindrical shape. Polyimide film has excellent insulation properties and high temperature resistance, and can adapt to temperature changes and vibration environment during aircraft flight. Alumina ceramic sheet has high strength, high insulation and good high temperature stability, which can improve the durability of insulating dielectric layer 21.

[0034] The thickness of the insulating dielectric layer 21 is 0.05mm to 0.5mm. For example, the thickness of the insulating dielectric layer 21 can be set to 0.05mm, 0.18mm or 0.5mm. The thickness range of 0.05mm to 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, thus affecting the discharge effect.

[0035] In this disclosure, both the high-voltage electrode 22 and the low-voltage electrode 23 can be made of copper foil, and their thickness is 0.01mm to 0.1mm. The width of the high-voltage electrode 22 is 0.8mm to 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 to 2.2mm. For example, the width of the low-voltage electrode 23 can be 1.8mm, 2mm, or 2.2mm. The spacing between two adjacent high-voltage electrodes 22 and two adjacent low-voltage electrodes 23 is 4mm to 5mm. For example, the spacing between two adjacent high-voltage electrodes 22 can be set to 4mm, 4.5mm, or 5mm, and the spacing between two adjacent low-voltage electrodes 23 can also be set to 4mm, 4.5mm, or 5mm. The specific spacing can be flexibly set according to the required jet velocity.

[0036] Additionally, it should be noted that in practical applications, the width of the high-voltage electrode 22 can be minimized to improve excitation efficiency, provided that electrode durability is ensured.

[0037] According to exemplary embodiments of this disclosure, such as Figure 1 , Figure 2 and Figure 5 As shown, the rotating jet plasma excitation device may further include a micro-sensor array 6, which is disposed on the carrier surface 11 and signal-connected to 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 component, and 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, which can collect key parameters such as flow velocity, shear stress, and flow field separation state of the flow field in real time, enabling the intelligent control module 5 to grasp the dynamic changes of the flow field in a timely manner. The signal connection between 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. The intelligent control module 5 can adjust the output of the power supply module 4 according to the feedback parameters, thereby changing the working state of the discharge component and realizing adaptive control of the flow field. This adaptive capability can effectively cope with the significant differences in flow field parameters at different flight stages and the dynamic instability phenomena within the flow field (such as turbulent bursts and low-speed strip evolution), greatly improving the adaptability of this rotating jet plasma excitation device to complex flow fields, reducing the fluctuation of control effects under different operating conditions, and better meeting the needs of aircraft for efficient and precise flow control.

[0038] According to exemplary embodiments of this disclosure, such as Figure 5 As shown, 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 DC high-voltage transformer 41 can provide a stable DC high voltage, providing the required electrical energy for the corona discharge assembly 3 to generate the normal main jet. The high-voltage sine wave power supply 42 has multiple independent output terminals, and each of the multiple independent output terminals is electrically connected to each high-voltage electrode 22 in a one-to-one correspondence. The ground terminal of the high-voltage sine wave power supply 42 is grounded to both the low-voltage electrode 23 and the corona negative electrode 312. The multiple independent output terminals enable independent power supply control for each high-voltage electrode 22, thereby controlling the activation state of the corresponding dielectric barrier discharge unit.

[0039] In this disclosure, a DC high-voltage transformer 41 supplies power to the corona discharge component 3 separately, and a high-voltage sine wave power supply 42 supplies power to the dielectric barrier discharge component 2 separately. The power supply types (DC and sine wave) of both are precisely matched with the discharge requirements of each component. The corona discharge requires a stable DC high voltage to ensure the intensity of the normal main jet, and the dielectric barrier discharge requires a sine wave to achieve dynamic activation, which greatly improves the stability and effectiveness of the discharge of each corona discharge component 3 and dielectric barrier discharge component 2.

[0040] Please refer to Figures 1 to 5The assembly process of the rotating jet plasma excitation device disclosed herein is as follows: First, the low-voltage electrode 23 is tightly attached to the inner side of the insulating dielectric layer 21 to ensure that there is no gap between the two, so as to ensure good electrical contact and structural stability. Next, the high-voltage electrode 22 is tightly attached to the outside of the insulating dielectric 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 consistent electric field distribution. This completes the assembly of the dielectric barrier discharge assembly 2. The assembled dielectric barrier discharge assembly 2 is then installed on the side of the carrier surface 11 away from the flow field to be controlled, and the dielectric barrier discharge assembly 2 is made coaxial with the jet hole 12. Then assemble the discharge electrode 31, specifically referring to... Figure 4 A corona positive electrode 313 and a corona negative electrode 312 are respectively installed at both ends of the annular housing 311. Here, slots can be formed on the inner sides of both ends of the annular housing 311 to connect the corona positive electrode 313 and the corona negative electrode 312 to the annular housing 311 via a snap-fit ​​method, forming a discharge electrode 31. The required number of discharge electrodes 31 are assembled in the above manner, ensuring that each discharge electrode 31 is coaxial and connected sequentially. Figure 2 As shown, to form a corona discharge assembly 3; The corona discharge assembly 3 is then assembled with the carrier 1 and the dielectric barrier discharge assembly 2. Specifically, the corona discharge assembly 3 is sleeved on the dielectric barrier discharge assembly 2, and the end face of the corona positive electrode 313 of the corona discharge assembly 3 is tightly attached to the jet hole 12, so that the corona discharge assembly 3 and the jet hole 12 are coaxially installed. Here, a positioning step can be set on the carrier 1 to achieve coaxiality between the corona discharge assembly 3 and the jet hole 12. Of course, the positioning pin and positioning hole can also be used to achieve coaxial installation. This disclosure does not make any specific restrictions on this.

[0041] Finally, connect the corona positive electrode 313 to the output terminal of the DC high-voltage transformer 41, and ground the ground terminal of the DC high-voltage transformer 41. Simultaneously, connect the multiple independent output terminals of the high-voltage sinusoidal power supply 42 to each high-voltage electrode 22, and ground the ground terminal of the high-voltage sinusoidal power supply 42. Then, connect the control input terminals of the DC high-voltage transformer 41 and the high-voltage sinusoidal power supply 42 to the signal output terminal of the intelligent control module 5 to achieve precise control of the excitation parameters. This completes the installation of the rotating jet plasma excitation device. Figure 5 As shown.

[0042] Based on the above technical solutions, this disclosure also provides an excitation method for the above-mentioned rotating jet plasma excitation device, comprising the following steps: Step S1: The intelligent control module 5 sends a start command to the power module 4, 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: The intelligent control module 5 sends a timing control command to the high-voltage sinusoidal power supply 42, so that each independent output terminal of the high-voltage sinusoidal power supply 42 outputs a high-voltage sinusoidal signal to the corresponding dielectric barrier discharge unit in a preset direction, thereby driving each dielectric barrier discharge unit to be activated 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 the 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.

[0043] In the above technical solution, the phase difference range can be adjusted according to the degree of flow field separation. The control logic of the preset direction in step S3 is as follows: the excitation triggering time of each dielectric barrier discharge unit is delayed by the intelligent control module 5 in a clockwise or counterclockwise order. The delay time is matched with the output frequency of the high-voltage sine wave power supply 42.

[0044] Please refer to Figures 1 to 5 The working process of the rotating jet plasma excitation device disclosed herein is detailed below: Under the control of the intelligent control module 5, the DC high-voltage transformer 41 is activated to apply a stable DC high voltage (voltage value can be -10kV to -20kV) between the corona negative electrode 312 and the corona positive electrode 313 of the corona discharge assembly 3, thereby establishing a strong electric field (e.g., along the z-direction, i.e., the normal direction) between the corona negative electrode 312 and the corona positive electrode 313. Figure 5 As shown), the electric field induces the ionization of air molecules, forming a stable corona discharge. The generated negative ions accelerate from the negative electrode to the positive electrode under the action of the electric field, frequently colliding with neutral gas molecules and transferring momentum, thereby inducing the generation of a continuously upward normal main jet within the jet hole 12, which serves as the basic airflow for flow control. Simultaneously, the intelligent control module 5 controls the high-voltage sinusoidal power supply 42, which applies a high-frequency high-voltage sinusoidal signal (voltage range can be from kV3 to 10kV, frequency can be 1kHz–10kHz) between multiple sets of high-voltage electrodes 22 and low-voltage electrodes 23. Under the constraint of the insulating dielectric layer 21, independent dielectric barrier discharge units are generated between the high-voltage electrodes 22 and the corresponding low-voltage electrodes 23, forming a plasma wind along the wall direction, i.e., forming a rotating jet. By adjusting the excitation timing of each channel through the intelligent control module 5, each set of dielectric barrier discharge units is activated sequentially in a clockwise or counterclockwise order, constructing a continuous rotating airflow field. The rotating airflow field drags the normal main jet located in the central region and causes it to spiral and twist through the superposition of angular momentum, ultimately merging to form a composite rotating jet with both normal penetrating power and circumferential rotational momentum. This composite rotating jet can significantly enhance the disturbance capability of pseudo-ordered structures such as low-velocity boundary layer strips and turbulent bursts, effectively suppress flow separation, and improve transition delay and drag reduction effects.

[0045] During the aforementioned process, the micro-sensor array 6 monitors parameters such as flow velocity, shear stress, and separation state in real time, and transmits the signals to the intelligent control module 5. The intelligent control module 5 can incorporate PID (a widely used engineering control technique that adjusts system errors through proportional, integral, and derivative control methods to achieve precise control), fuzzy logic, or machine learning algorithms to analyze the flow field state in real time. When flow instability is detected (such as pre-separation precursors or enhanced turbulence), it can dynamically adjust the activation sequence, phase difference, and voltage amplitude of the dielectric barrier discharge component units, and independently adjust the DC voltage to control the intensity of the normal main jet. Simultaneously, the intelligent control module 5 can also adaptively adjust the excitation frequency based on the incoming flow velocity to match boundary layer instability waves, achieving efficient resonance control. The entire closed-loop response can be completed in milliseconds, ensuring the timeliness and adaptability of the control, significantly improving energy utilization efficiency and control performance under complex operating conditions.

[0046] In summary, the rotating jet plasma excitation device disclosed herein can generate a high-momentum normal main jet using corona discharge as the active source. The dielectric barrier discharge component 2 is used to generate a low-energy wall-induced flow, i.e., a rotating jet. This rotating jet is mainly used to control the rotational characteristics of the normal main jet and does not need to undertake the main energy output task. Therefore, through the synergistic mechanism of the dielectric barrier discharge component 2 and the corona discharge component 3, this disclosure significantly reduces the overall energy consumption while ensuring strong excitation capability, and significantly improves the energy conversion efficiency and excitation benefits of the system.

[0047] Furthermore, this disclosure utilizes a plasma discharge mechanism based on pure electric drive, eliminating the need for mechanical moving parts, gas sources, or bleed air pipelines. The discharge setup time can reach the microsecond level, exhibiting extremely fast response speed. Moreover, through the timing control of the multi-channel high-voltage power supply by the intelligent control module 5, real-time switching of rotation direction (clockwise, counterclockwise), rotation frequency, and intensity can be achieved. It supports wideband control from quasi-static to high-frequency unsteady excitation, enabling flexible adaptation to complex flow changes of the aircraft under different operating conditions. It is particularly suitable for scenarios with extremely high dynamic response requirements, such as turbulence drag reduction and boundary layer transition control.

[0048] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0049] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0050] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this 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 with 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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