CN113316303B - DC arc driven plasma synthetic jet array excitation device and method - Google Patents

Abstract

The device comprises a direct current power supply, a high-voltage pulse generator, two high-voltage silicon stacks, two resistors, a high-voltage electronic switch Q1 and an array formed by connecting a plurality of plasma synthetic jet exciters in series; the high-voltage pulse generator, the high-voltage silicon stack D2 and the plasma synthetic jet actuator array form a high-voltage breakdown loop; the direct current power supply, the resistor R2, the high-voltage silicon stack D1 and the exciter array form a direct current power supply loop, so that the discharge is not extinguished; the direct-current power supply, the high-voltage electronic switch Q1, the resistor R1, the high-voltage silicon stack D1 and the exciter array form a pulse discharge loop; the three power supply loops work alternately to realize the high-frequency work of the plasma synthetic jet. A method for synchronously exciting the DC arc driven plasma synthetic jet array is also disclosed. The excitation device only needs one high-voltage breakdown process, and does not use a heavy-frequency high-voltage pulse power supply.

Description

DC arc driven plasma synthetic jet array excitation device and method

Technical field

The invention relates to the field of active flow control, in particular to a DC arc driven plasma synthetic jet array excitation device and method.

Background technique

Increasing lift and reducing drag is an eternal theme in the development of aircraft. Currently, aircraft design based on traditional layout has reached a very high level. To further improve the performance of aircraft, active flow control technology must be relied upon. At the heart of this technology is the exciter. As a special active flow control actuator, the plasma synthetic jet actuator has the significant advantages of high jet velocity (>500m/s) and excitation frequency bandwidth (10kHz), so it has broad application prospects in the field of active flow control. However, limited by the jet aperture (1-3mm) and cavity volume, the flow control range of a single plasma synthetic jet actuator is extremely limited, generally not exceeding 10mm along the span. In order to achieve flow separation control of aircraft flaps at a spatial scale of tens of meters at large deflection angles, multiple plasma synthetic jet actuators need to be arranged together to form an array. Existing plasma synthetic jet array excitation generating devices can be roughly divided into two categories. One type is the series discharge circuit (Boretskij V.et al.Properties of Multi-Spark Plasma Discharge Developed for Flow Control.AIAA 2016-0451, 2016.; Wu Yun, Zhang Zhibo, Jin Di, Gan Tian, Song Huimin, Jia Min, Liang Hua. "Single power supply driven array type plasma synthetic jet flow control device and flow control method", application number: 201910669998.7, 2015), a high-voltage repeated frequency pulse generator is required to periodically impact an array composed of multiple gas gaps. The disadvantages are the large electromagnetic interference during the repeated frequency breakdown process and the high cost of high-voltage switching devices. The other type is the parallel discharge circuit (Shao Tao, Wang Lei, Zhang Cheng, Yan Ping, Luo Zhenbing, Wang Lin. "High-voltage pulse power supply for simultaneous discharge of multiple plasma synthetic jet actuators", application number: 201510578087.5, 2015; Shao Tao , Wang Lei, Zhang Cheng, Yan Ping, Luo Zhenbing, Wang Lin. "High-voltage pulse power supply for simultaneous discharge of multiple plasma synthetic jet actuators", application number: 201510058090.4, 2015), that is, each actuator is connected with a resistor, The transformer windings are connected to the high-voltage generating circuits of other semiconductor devices. Although the parallel discharge circuit does not require a high-voltage switch, the power supply is large in size and has many components, and the discharge of each exciter is not strictly synchronized. In summary, how to use a simple circuit to achieve high-frequency and low-noise synchronous discharge of a plasma synthetic jet array is still a problem so far.

Contents of the invention

The present invention proposes a DC arc driven plasma synthetic jet array synchronous excitation device, which is characterized in that it includes a DC power supply, a high-voltage pulse generator, a first high-voltage silicon stack D1, a second high-voltage silicon stack D2, and a first resistor R1 , the second resistor R2, the high-voltage electronic switch Q1, and a plurality of plasma synthetic jet actuators connected in series to form a plasma synthetic jet actuator array; where

The high-voltage electronic switch Q1 is connected in series with the first resistor R1 to form a series structure, and the series structure is connected in parallel with the second resistor R2 as a whole to form a series-parallel structure; among the two ends of the series-parallel structure, the high-voltage electronic switch Q1 is connected to The positive terminal of the DC power supply is connected, and the two resistor connecting terminals are connected to the positive terminal of the first high-voltage silicon stack D1; the positive terminal of the high-voltage pulse generator is connected to the positive terminal of the second high-voltage silicon stack D2, and the negative terminal of the second high-voltage silicon stack D2 Connected to the negative end of the first high-voltage silicon stack D1; multiple plasma synthetic jet actuators are connected in series to form a plasma synthetic jet actuator array; in this array, the left end of the first plasma synthetic jet actuator is connected to the first plasma synthetic jet actuator. The negative end of the first high-voltage silicon stack D1 is connected to the negative end of the second high-voltage silicon stack D2, and the right end is connected to the left end of the second plasma synthetic jet exciter; the right end of the second plasma synthetic jet exciter is connected to the third plasma synthetic jet exciter. The left end is connected... and so on, forming an end-to-end structure; the right end of the Nth plasma synthetic jet actuator at the end of the array is grounded, N is the number of plasma synthetic jet actuators; the negative terminal of the DC power supply and the negative terminal of the high-voltage pulse generator are both Ground.

In one embodiment of the present invention, the plasma synthetic jet exciter consists of a cavity with a small hole and two oppositely inserted tungsten needle electrodes; the volume of the cavity is 50-1000mm ³ ; the electrode spacing is 0.5- 4mm; the diameter of the exit hole is 1-3mm.

In a specific embodiment of the present invention, the volume of the cavity is 50mm ³ ; the diameter of the tungsten needle electrode is 1-3mm; the electrode spacing is 1mm; and the diameter of the exit hole is 2mm.

The working process of the above DC arc driven plasma synthetic jet array synchronous excitation device is as follows:

The high-voltage pulse generator, the second high-voltage silicon stack D2 and the plasma synthesis jet exciter array form a high-voltage breakdown circuit to achieve discharge breakdown; the DC power supply, the second resistor R2, the first high-voltage silicon stack D1 and the plasma synthesis The jet exciter array forms a DC power supply circuit, which is used to maintain the arc formed by the plasma synthetic jet exciter array after high voltage breakdown to ensure that the discharge is not extinguished; DC power supply, high-voltage electronic switch Q1, first resistor R1, first The high-voltage silicon stack D1 and the plasma synthetic jet exciter array form a pulse discharge circuit, which is used to periodically inject energy into the plasma synthetic jet actuator; these three power supply loops work alternately to achieve high-frequency operation of the plasma synthetic jet. .

A DC arc driven plasma synthetic jet array synchronous excitation method is also provided, which specifically includes the following steps:

(1) Phase A: Ignition triggering phase

At this stage, the high-voltage pulse generator outputs a high-voltage pulse and applies it to both ends of the second high-voltage silicon stack D2 and the plasma synthetic jet actuator array; when the pulse amplitude exceeds the corresponding breakdown of all air gaps of the plasma synthetic jet actuator When the voltage is summed, a discharge arc channel is formed between the electrodes of the plasma synthetic jet exciter;

(2) Stage B: High energy release stage

After the ignition is triggered, the high-voltage electronic switch Q1 is turned on, and the plasma synthetic jet excitation array enters stage B; in this stage, the DC power supply passes between the electrodes of the plasma synthetic jet exciter through the first resistor R1 and the first high-voltage silicon stack D1. Energy is injected into the arc channel; the strong discharge current causes the arc diameter to increase rapidly and the temperature to rise sharply, achieving rapid pressurization of the gas in the cavity of the plasma synthetic jet exciter; driven by the pressure difference inside and outside the cavity, the jet flows from the plasma The synthetic jet ejects from the outlet hole of the cavity of the body synthetic jet exciter;

(3) Stage C: Low-energy dimensional arc stage

After the high-energy release stage, the high-voltage electronic switch Q1 is turned off, and the plasma synthetic jet excitation device enters the low-energy dimensional arc stage, that is, stage C; the DC power supply, the second resistor R2, the first high-voltage silicon stack D1 and the plasma synthetic jet exciter The array forms a closed discharge circuit; the discharge current in the circuit is only to maintain the arc channel without extinguishing, and the heating effect on the gas can be ignored; due to natural cooling, the gas temperature and pressure in the cavity of the plasma synthetic jet actuator begin to slowly decrease , the external ambient atmosphere is re-inhaled into the plasma synthetic jet exciter through the exit hole, restoring the cavity to its initial state;

(4) Stage B/C alternation: high-frequency jet generation stage

Since the arc is not extinguished after a complete working cycle, the high-voltage electronic switch Q1 is turned on and off alternately, that is, repeatedly entering stages B and C, to generate a high-frequency pulse jet.

In a specific embodiment of the present invention, in stage A: the amplitude of the high-voltage pulse output by the high-voltage pulse generator is >20kV, and the pulse width is not limited.

In another specific embodiment of the present invention, in stage B: the resistance of the first resistor R1 is on the order of 100Ω.

In another specific embodiment of the present invention, in stage C: the resistance of the second resistor R2 is on the order of 100 kΩ.

The invention can realize "one-time ignition and high-frequency operation" of the exciter array, overcome the shortcomings of traditional excitation devices such as large electromagnetic interference, high cost, and large power supply volume, and is of great significance for promoting the engineering application of active flow control.

In addition, in this method, the multiple arcs of the plasma synthetic jet array are not extinguished, so only one high-voltage breakdown is required, which overcomes the problem of strong electromagnetic interference caused by high-frequency and high-voltage pulses during repeated breakdowns.

Traditional excitation devices require frequent breakdown of the air gap and cause large electromagnetic interference. The excitation device in the present invention only requires one high-voltage breakdown process and has small electromagnetic interference.

Traditional excitation devices are limited by the maximum repetitive working frequency of high-voltage pulse power supply, and the discharge frequency is generally below 5kHz. The excitation device in the present invention does not need to use a repeated frequency high-voltage pulse power supply. The operating frequency of the exciter array is determined by the high-voltage electronic switch Q1 and can reach 50kHz.

The high-voltage pulse generator in the present invention can be realized by a low-price ignition power supply, and is economical.

Description of drawings

Figure 1 shows a DC arc driven plasma synthetic jet array excitation device;

Figure 2 shows a schematic diagram of the discharge waveform of the plasma synthetic jet array;

Figure 3 shows the three working stages of the plasma synthetic jet array.

Detailed ways

Figure 1 shows the DC arc driven plasma synthetic jet array excitation device of the present invention. The device mainly includes a DC power supply (voltage in the order of 1000V), a high-voltage pulse generator (pulse voltage: 20-30kV), two high-voltage silicon stacks (D1 and D2), two resistors (R1 and R2), A high-voltage electronic switch Q1 and several plasma synthetic jet exciters are connected in series to form an array. Among them, the high-voltage electronic switch Q1 is connected in series with the first resistor R1 to form a series structure, and the series structure is connected in parallel with the second resistor R2 as a whole to form a series-parallel structure; at both ends of the series-parallel structure, the high-voltage electronic switch Q1 The terminal is connected to the positive terminal of the DC power supply, and the two resistor connecting terminals are connected to the positive terminal of the first high-voltage silicon stack D1. The positive terminal of the high-voltage pulse generator is connected to the positive terminal of the second high-voltage silicon stack D2, and the negative terminal of the second high-voltage silicon stack D2 is connected to the negative terminal of the first high-voltage silicon stack D1. A plurality of plasma synthetic jet actuators are connected in series to form a plasma synthetic jet actuator array. In this array, the left end of the first plasma synthetic jet exciter is connected to the negative end of the first high-voltage silicon stack D1 and the negative end of the second high-voltage silicon stack D2, and the right end is connected to the left end of the second plasma synthetic jet exciter; The right end of the second plasma synthetic jet actuator is connected to the left end of the third plasma synthetic jet actuator...and so on, forming a head-to-tail structure; the right end of the Nth plasma synthetic jet actuator at the end of the array is grounded, and N is the plasma synthetic jet. Number of exciters. The negative terminal of the DC power supply and the negative terminal of the high-voltage pulse generator are both grounded.

Each plasma synthetic jet exciter consists of a cavity with a small hole and two oppositely inserted tungsten needle electrodes (Zong Haohua, Song Huimin, Liang Hua, Jia Min, Li Yinghong. Experiment on the characteristics of nanosecond pulsed plasma synthetic jet Research[J]. Propulsion Technology, 2015, (10): 1474-1478.). The volume of the cavity is approximately 50-1000mm ³ , and 50mm ³ is preferred for heating efficiency. The diameter of the tungsten needle electrode is 1-3mm, and 2mm is preferred for ablation resistance. The electrode spacing range is 0.5-4mm, and 1mm is preferred to facilitate discharge breakdown. The diameter of the outlet hole is 1-3mm, preferably 2mm.

The high-voltage pulse generator, the second high-voltage silicon stack D2 and the plasma synthetic jet exciter array form a high-voltage breakdown circuit to achieve discharge breakdown. The DC power supply, the second resistor R2, the first high-voltage silicon stack D1 and the plasma synthetic jet actuator array form a DC power supply circuit, which is used to maintain the arc formed by the plasma synthetic jet actuator array after high voltage breakdown to ensure discharge. Not extinguished. The DC power supply, the high-voltage electronic switch Q1, the first resistor R1, the first high-voltage silicon stack D1 and the plasma synthetic jet actuator array form a pulse discharge circuit for periodically injecting energy into the plasma synthetic jet actuator. These three power supply loops work alternately to achieve high-frequency operation of the plasma synthetic jet.

Figure 2 shows the discharge waveform of the plasma synthetic jet exciter array during high-frequency operation. The entire discharge waveform can be divided into three stages: A, B and C. The working status of the plasma synthetic jet exciter corresponding to each stage is shown in Figure 3. The working process of the excitation device in Figure 1 will now be introduced with reference to Figures 2 and 3.

A DC arc driven plasma synthetic jet array excitation device and method specifically includes the following steps:

(1) Ignition triggering phase (Phase A).

At this stage, the high-voltage pulse generator outputs a high-voltage pulse (amplitude >20kV, pulse width is not limited) and is applied to both ends of the second high-voltage silicon stack D2 and the plasma synthetic jet exciter array. When the pulse amplitude exceeds the sum of breakdown voltages corresponding to all air gaps of the plasma synthetic jet actuator, a discharge arc channel is formed between the electrodes of the plasma synthetic jet actuator, corresponding to the current spike in Figure 2.

(2) High energy release stage (stage B).

After the ignition is triggered, the high-voltage electronic switch Q1 is opened, and the plasma synthetic jet excitation array enters the high-energy release stage (stage B). At this stage, the DC power supply injects energy into the arc channel between the electrodes of the plasma synthetic jet actuator through the first resistor R1 (for example, the resistance value is in the order of 100Ω) and the first high-voltage silicon stack D1, and the discharge current is 10A. class. The strong discharge current causes the arc diameter to rapidly increase and the temperature to rise sharply, achieving rapid pressurization of the gas in the cavity of the plasma synthetic jet exciter. Driven by the pressure difference inside and outside the cavity, the jet is ejected from the exit hole of the plasma synthetic jet exciter cavity.

(3) Low-energy dimensional arc stage (stage C).

After the high-energy release stage ends, the high-voltage electronic switch Q1 is closed, and the plasma synthetic jet excitation device enters the low-energy dimensional arc stage, which is stage C. The DC power supply, the second resistor R2 (for example, the resistance value is in the order of 100 kΩ), the first high-voltage silicon stack D1 and the plasma synthetic jet exciter array form a closed discharge circuit. The discharge current in the circuit is only on the order of 10mA, which is only used to maintain the arc channel without extinguishing, and the heating effect on the gas can be ignored. Due to natural cooling, the gas temperature and pressure in the cavity of the plasma synthetic jet actuator begin to slowly decrease, and the external ambient atmosphere is re-inhaled into the plasma synthetic jet actuator through the outlet hole, causing the cavity to return to its initial state.

(4) High-frequency jet generation stage (stage B/C alternation)

Since the arc is not extinguished after a complete working cycle, the high-voltage electronic switch Q1 is alternately opened and closed (that is, the exciter repeatedly enters stages B and C) to generate a high-frequency pulse jet.

The core of the invention is to set up a low-energy dimensional arc loop in the excitation device to keep the arc in a non-extinguishing state during the operation of the plasma synthetic jet exciter array, thereby achieving the purpose of "one breakdown, high-frequency operation". High-voltage electronic switches can use IGBT or MOSFET.

Claims (7)

1. A DC arc-driven plasma synthetic jet array synchronous excitation device, characterized in that it includes a DC power supply, a high-voltage pulse generator, a first high-voltage silicon stack D1, a second high-voltage silicon stack D2, a first resistor R1, The second resistor R2, the high-voltage electronic switch Q1, and multiple plasma synthetic jet actuators are connected in series to form a plasma synthetic jet actuator array; the high-voltage electronic switch Q1 and the first resistor R1 are connected in series to form a series structure, The series structure is then connected in parallel with the second resistor R2 as a whole to form a series-parallel structure; at both ends of the series-parallel structure, the high-voltage electronic switch Q1 terminal is connected to the positive terminal of the DC power supply, and the two resistor connection terminals are connected to the first high-voltage The positive terminal of the silicon stack D1 is connected; the positive terminal of the high-voltage pulse generator is connected to the positive terminal of the second high-voltage silicon stack D2, and the negative terminal of the second high-voltage silicon stack D2 is connected to the negative terminal of the first high-voltage silicon stack D1; multiple plasmas The volume synthetic jet actuators are connected in series to form a plasma synthetic jet actuator array; in this array, the left end of the first plasma synthetic jet actuator is connected to the negative end of the first high-voltage silicon stack D1 and the negative end of the second high-voltage silicon stack D2 connected, the right end is connected to the left end of the second plasma synthetic jet actuator; the right end of the second plasma synthetic jet actuator is connected to the left end of the third plasma synthetic jet actuator; and so on, multiple plasma synthetic jet actuators constitute End-to-end structure; the right end of the Nth plasma synthetic jet actuator at the end of the array is grounded, N is the number of plasma synthetic jet actuators; the negative terminal of the DC power supply and the negative terminal of the high-voltage pulse generator are both grounded; The working process of the DC arc driven plasma synthetic jet array synchronous excitation device is as follows: The high-voltage pulse generator, the second high-voltage silicon stack D2 and the plasma synthesis jet exciter array form a high-voltage breakdown circuit to achieve discharge breakdown; the DC power supply, the second resistor R2, the first high-voltage silicon stack D1 and the plasma synthesis The jet exciter array forms a DC power supply circuit, which is used to maintain the arc formed by the plasma synthetic jet exciter array after high voltage breakdown to ensure that the discharge is not extinguished; DC power supply, high-voltage electronic switch Q1, first resistor R1, first The high-voltage silicon stack D1 and the plasma synthetic jet exciter array form a pulse discharge circuit, which is used to periodically inject energy into the plasma synthetic jet actuator; these three power supply loops work alternately to achieve high-frequency operation of the plasma synthetic jet. . 2. The DC arc driven plasma synthetic jet array synchronous excitation device as claimed in claim 1, characterized in that the plasma synthetic jet exciter consists of a cavity with small holes and two oppositely inserted tungsten needle electrodes. Composition; the volume of the cavity is 50-1000mm ³ ; the electrode spacing is 0.5-4mm; the diameter of the outlet hole is 1-3mm. 3. The DC arc driven plasma synthetic jet array synchronous excitation device according to claim 2, characterized in that the volume of the cavity is 50mm ³ ; the diameter of the tungsten needle electrode is 1-3mm; the electrode spacing is 1mm; and the outlet The diameter of the small hole is 2mm. 4. A synchronous excitation method for a DC arc driven plasma synthetic jet array synchronous excitation device as claimed in claim 1, characterized in that it specifically includes the following steps: (1) Phase A: Ignition triggering phase At this stage, the high-voltage pulse generator outputs a high-voltage pulse and applies it to both ends of the second high-voltage silicon stack D2 and the plasma synthetic jet actuator array; when the pulse amplitude exceeds the corresponding breakdown of all air gaps of the plasma synthetic jet actuator When the voltage is summed, a discharge arc channel is formed between the electrodes of the plasma synthetic jet exciter; (2) Stage B: High energy release stage After the ignition is triggered, the high-voltage electronic switch Q1 is turned on, and the plasma synthetic jet excitation array enters stage B; in this stage, the DC power supply passes between the electrodes of the plasma synthetic jet exciter through the first resistor R1 and the first high-voltage silicon stack D1. Energy is injected into the arc channel; the strong discharge current causes the arc diameter to increase rapidly and the temperature to rise sharply, achieving rapid pressurization of the gas in the cavity of the plasma synthetic jet exciter; driven by the pressure difference inside and outside the cavity, the jet flows from the plasma The synthetic jet ejects from the outlet hole of the cavity of the body synthetic jet exciter; (3) Stage C: Low-energy dimensional arc stage After the high-energy release stage, the high-voltage electronic switch Q1 is turned off, and the plasma synthetic jet excitation device enters the low-energy dimensional arc stage, that is, stage C; the DC power supply, the second resistor R2, the first high-voltage silicon stack D1 and the plasma synthetic jet exciter The array forms a closed discharge circuit; the discharge current in the circuit is only to maintain the arc channel without extinguishing, and the heating effect on the gas can be ignored; due to natural cooling, the gas temperature and pressure in the cavity of the plasma synthetic jet actuator begin to slowly decrease , the external ambient atmosphere is re-inhaled into the plasma synthetic jet exciter through the exit hole, restoring the cavity to its initial state; (4) Stage B/C alternation: high-frequency jet generation stage Since the arc is not extinguished after a complete working cycle, the high-voltage electronic switch Q1 is turned on and off alternately, that is, repeatedly entering stages B and C, to generate a high-frequency pulse jet. 5. The synchronous excitation method according to claim 4, characterized in that, in stage A: the amplitude of the high-voltage pulse output by the high-voltage pulse generator is >20kV, and the pulse width is not limited. 6. The synchronous excitation method according to claim 4, wherein in stage B: the resistance of the first resistor R1 is in the order of 100Ω. 7. The synchronous excitation method according to claim 4, wherein in stage C: the resistance of the second resistor R2 is in the order of 100 kΩ.