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CN109462930A - Strengthen the method for plasma discharges under a kind of gas flowing environment using double ground electrodes - Google Patents

Strengthen the method for plasma discharges under a kind of gas flowing environment using double ground electrodes Download PDF

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Publication number
CN109462930A
CN109462930A CN201811604633.8A CN201811604633A CN109462930A CN 109462930 A CN109462930 A CN 109462930A CN 201811604633 A CN201811604633 A CN 201811604633A CN 109462930 A CN109462930 A CN 109462930A
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ground electrode
discharge
downstream
gas flow
electrode
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CN201811604633.8A
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唐井峰
周德胜
唐邈
于达仁
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Harbin Institute of Technology Shenzhen
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Harbin Institute of Technology Shenzhen
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Electromagnetism (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)

Abstract

一种气体流动环境下利用双地电极强化等离子体放电的方法，它涉及一种强化等离子体放电的方法。本发明是要解决现有的气体流动环境下的放电强度会减弱的技术问题。本发明利用气流的输运作用将放电空间中上游的含能粒子输运至下游放电区域，输运至下游放电区域的带电粒子提高了下游放电区域的初始含能粒子浓度，利用含能粒子的预电离作用，当下一次放电脉冲来临时，下游放电强度明显提升。同时，本发明需要合理匹配气流输运时间与脉冲时间间隔，保证上游放电产生的带电粒子能在脉冲间隔时间内输运至下游放电区域，提高了下游放电区域的初始含能粒子浓度，当下一次放电脉冲来临时，下游放电强度明显提升。

A method for intensifying plasma discharge using double ground electrodes in a gas flow environment relates to a method for intensifying plasma discharge. The present invention is to solve the technical problem that the discharge intensity will be weakened in the existing gas flow environment. The invention utilizes the transport function of air flow to transport the energetic particles upstream in the discharge space to the downstream discharge area, and the charged particles transported to the downstream discharge area increase the initial energetic particle concentration in the downstream discharge area, and the Pre-ionization, when the next discharge pulse comes, the downstream discharge intensity is significantly increased. At the same time, the present invention needs to reasonably match the air flow transport time and the pulse time interval to ensure that the charged particles generated by the upstream discharge can be transported to the downstream discharge area within the pulse interval time, thereby increasing the initial energetic particle concentration in the downstream discharge area. When the discharge pulse comes, the downstream discharge intensity increases significantly.

Description

Strengthen the method for plasma discharges under a kind of gas flowing environment using double ground electrodes
Technical field
The present invention relates to a kind of methods for strengthening plasma discharge.
Background technique
Electric discharge under gas flowing environment electrostatic precipitation, flowing control, in terms of have a wide range of applications Value.In the discharge technology in gas flowing environment, since the heat and mass of air-flow acts on, in discharge space charged particle and Energy is influenced by airflow function, and strength of discharge will appear apparent decrease, especially under the conditions of high-speed flow when, electric discharge very To the case where will appear extinguishing.Therefore, how to improve strength of discharge under the flow conditions is that the electric discharge under flowing environment has to In face of the problem of.
Currently, the method for improving strength of discharge is most of by the way of improving voltage or input energy, but this method Have following two problem:
One, the technical difficulty of power supply is big；
Two, electrode structural designs difficulty is big.
It is above-mentioned to will lead at high cost, discharge instability, very big pressure is brought to application.
Summary of the invention
It will appear the technology significantly weakened the present invention is to solve the strength of discharge under existing gas flowing environment to ask Topic, and a kind of method for being strengthened plasma discharges under gas flowing environment using double ground electrodes is provided.
Strengthening the method for plasma discharge using double ground electrodes under gas flowing environment of the invention is according to the following steps It carries out:
Air stream outlet, which is arranged in, in the two-stage of electric discharge device ionizes gas between the two-stage of electric discharge device；Institute The two-stage for the electric discharge device stated is high-field electrode and ground electrode respectively, and the two-stage of electric discharge device is parallel, the electric discharge of electric discharge device Direction is vertical with airflow direction；The high-field electrode of electric discharge device and the anode of high-frequency and high-voltage impulse power supply connect, electric discharge device The connection of the cathode of ground electrode and high-frequency and high-voltage impulse power supply；The ground electrode of electric discharge device is divided into upstream ground electrode and downstream electricity Pole, upstream ground electrode and downstream ground electrode are in parallel, and upstream ground electrode and downstream ground electrode are arranged in juxtaposition along airflow direction, on Ground electrode is swum close to air stream outlet, downstream ground electrode is far from air stream outlet；
High-field electrode is more than or equal to upstream ground electrode along the length of gas flow direction along the length of gas flow direction Spend L1, the distance between upstream ground electrode and downstream ground electrode L2With downstream ground electrode along the length L of gas flow direction3Three The summation of a size；
Within the interpulse period of high-frequency and high-voltage impulse power supply, the transport distance of gas is more than or equal to L2And it is less than or equal to L1+L2+L3, i.e. L2≤v·tp≤L1+L2+L3, v is the flowing velocity of gas, tpIt is the pulse period of high-frequency and high-voltage impulse power supply.
Heretofore described gas is any ionizable gas.
The present invention is in gas flow channel, and along the electric discharge device for arranging upstream and downstream structure on airflow direction, upstream is It is proximate to air stream outlet, downstream is far from air stream outlet, and electric discharge device generates high-intensity discharge region in gas flow channel, Two ground electrodes share a high-field electrode, and two ground electrodes are arranged in juxtaposition along airflow direction in the upstream of gas flow direction The downstream and；
The present invention forms two parts area to high-field electrode, upstream ground electrode and downstream ground electrode using high-voltage pulse power source Domain is discharged, and two heating regions are generated, then by adjusting pulse period, gas flow rate and two ground electrode spacing Relationship between three can guarantee that within the interpulse period of high-frequency and high-voltage impulse power supply, two-stage electric discharge in upstream generates Energy-containing particle in plasma is transported to downstream two-stage region of discharge under the transport effect of continuous flow, and then improves down Swim the initial energy-containing particle density of two-stage region of discharge.
The energy-containing particle that two-stage electric discharge in upstream generates rationally is transported to downstream two using the transport effect of air-flow by the present invention Grade region of discharge, improves the concentration of initial energy-containing particle in the two-stage region of discharge of downstream；When discharge pulse excitation next time comes Temporarily, the energy-containing particle for being transported to downstream two-stage region of discharge plays the role of preionization, using the avalanche effect of particle, The Cascaded amplification of particle concentration is formed, and then realizes the enhancing of the strength of discharge of downstream two-stage region of discharge.
Detailed description of the invention
Fig. 1 is the principle knot for testing the method for strengthening plasma discharge in one under gas flowing environment using double ground electrodes Structure schematic diagram, arrow indicate airflow direction, and 1 is gas tank, and 2 be valve, and 3 be gas transport pipeline, and 4 be hf and hv pulse electricity Source, 5 be high-field electrode, and 6 be upstream plasma body region, and 7 be upstream ground electrode, and 8 be downstream ground electrode, and 9 be insulating supporting, 10 It is downstream plasma body region；
Fig. 2 is the top view of ground electrode in Fig. 1；
Fig. 3 is the top view of Fig. 1 mesohigh electrode.
Specific embodiment
Specific embodiment 1: present embodiment is to strengthen plasma using double ground electrodes under a kind of gas flowing environment The method of electric discharge specifically carries out according to the following steps:
Air stream outlet, which is arranged in, in the two-stage of electric discharge device ionizes gas between the two-stage of electric discharge device；Institute The two-stage for the electric discharge device stated is high-field electrode and ground electrode respectively, and the two-stage of electric discharge device is parallel, the electric discharge of electric discharge device Direction is vertical with airflow direction；The high-field electrode of electric discharge device and the anode of high-frequency and high-voltage impulse power supply connect, electric discharge device The connection of the cathode of ground electrode and high-frequency and high-voltage impulse power supply；The ground electrode of electric discharge device is divided into upstream ground electrode and downstream electricity Pole, upstream ground electrode and downstream ground electrode are in parallel, and upstream ground electrode and downstream ground electrode are arranged in juxtaposition along airflow direction, on Ground electrode is swum close to air stream outlet, downstream ground electrode is far from air stream outlet；
High-field electrode is more than or equal to upstream ground electrode along the length of gas flow direction along the length of gas flow direction Spend L1, the distance between upstream ground electrode and downstream ground electrode L2With downstream ground electrode along the length L of gas flow direction3Three The summation of a size；
Within the interpulse period of high-frequency and high-voltage impulse power supply, the transport distance of gas is more than or equal to L2And it is less than or equal to L1+L2+L3, i.e. L2≤v·tp≤L1+L2+L3, v is the flowing velocity of gas, tpIt is the pulse period of high-frequency and high-voltage impulse power supply.
Specific embodiment 2: the present embodiment is different from the first embodiment in that: the hf and hv pulse The pulse width of power supply is nanosecond~Microsecond grade.Other are same as the specific embodiment one.
Specific embodiment 3: the present embodiment is different from the first and the second embodiment in that: the high-frequency and high-voltage The pulse frequency of the pulse power is greater than 0 and is less than 50KHz.Other are the same as one or two specific embodiments.
Specific embodiment 4: unlike one of present embodiment and specific embodiment one to three: when the stream of gas When dynamic speed v is constant, and the electric installation that discharges structure it is fixed when, by adjusting discharge frequency come adjusting output intensity, and full Sufficient L2≤v/f≤L1+L2+L3；
When discharge frequency is fixed, come adjusting output intensity by way of changing electric discharge device structure, and meet L2≤ v/f≤L1+L2+L3.Other are identical as one of specific embodiment one to three.
Specific embodiment 5: the present embodiment is different from the first embodiment in that: below the high-field electrode Insulating supporting is pasted, pastes insulating supporting below ground electrode.Other are same as the specific embodiment one.
The present invention is verified with following tests:
Test one: this test is a kind of method for being flowed using gas and strengthening plasma discharge, as shown in Figure 1-Figure 3, Specifically carry out according to the following steps:
Air stream outlet, which is arranged in, in electric discharge device ionizes gas between the two-stage of electric discharge device；Described puts The two-stage of electric installation is high-field electrode 5 and ground electrode respectively, and the two-stage of electric discharge device is parallel, the course of discharge of electric discharge device with Airflow direction is vertical；The high-field electrode 5 of electric discharge device is connect with the anode of high-frequency and high-voltage impulse power supply 4, the ground electricity of electric discharge device Pole is connect with the cathode of high-frequency and high-voltage impulse power supply 4；The ground electrode of electric discharge device is divided into upstream ground electrode 7 and downstream ground electrode 8, Upstream ground electrode 7 and downstream ground electrode 8 are in parallel, and upstream ground electrode 7 and downstream ground electrode 8 are arranged in juxtaposition along airflow direction, Upstream ground electrode 7 is close to air stream outlet, and downstream ground electrode 8 is far from air stream outlet；
Insulating supporting 9 is pasted below the high-field electrode 5, pastes insulating supporting 9 below ground electrode, insulating supporting 9 is Micarex；The entrance of gas transport pipeline 3 and the outlet of gas tank 1, are arranged valve between gas transport pipeline 3 and gas tank 1 2；
High-field electrode 5 is 70mm along the length of gas flow direction, between upstream ground electrode 7 and downstream ground electrode 8 Distance L2For 10mm, upstream ground electrode 7 along gas flow direction length L1For 30mm, downstream ground electrode 8 is flowed along gas The length L in direction3For 30mm；
The pulse frequency of high-frequency and high-voltage impulse power supply 4 is 1kHz, and the spacing of high-field electrode 5 and ground electrode is 5mm, electric discharge electricity Pressure amplitude value is 30kV, and air velocity range is 0m/s~100m/s；
Within the interpulse period of high-frequency and high-voltage impulse power supply 4, the transport distance of gas is more than or equal to L2And be less than etc. In L1+L2+L3, i.e. L2≤v·tp≤L1+L2+L3, v is the flowing velocity of gas, tpIt is the pulse week of high-frequency and high-voltage impulse power supply Phase, the parameter of this corresponding test, air velocity are 10m/s~70m/s, i.e., when air velocity is higher than 10m/s and is lower than 70m/s When, under conditions of the pulse period is 1ms, it can use the transport effect of air-flow, contain what upstream discharge region of discharge 6 generated Energy PARTICLE TRANSPORT FROM improves charged particle concentration in downstream area 10 to downstream discharge region 10；When next time, discharge pulse comes Temporarily, it is acted on using the Cascaded amplification of charged particle in downstream discharge region 10, forms high concentration energy-containing particle region, downstream Strength of discharge increases.
This test utilizes the electric discharge device of upstream and downstream structure, and two are generated in gas flow channel with certain density Heating region 6 and 10；Under conditions of Proper Match discharge frequency and air-flow transport time, work is transported using air-flow With the energy-containing particle that upstream discharge region 6 generates is transported in downstream discharge region 10, is improved in downstream discharge region 10 Initial energy-containing particle concentration；When next pulse is arrived, by the collision cascade amplification mechanism of charged ion, improve down The particle concentration in region of discharge 10 is swum, the raising of strength of discharge under flowing environment is realized.

Claims (5)

1.一种气体流动环境下利用双地电极强化等离子体放电的方法，其特征在于气体流动环境下利用双地电极强化等离子体放电的方法是按以下步骤进行的：1. the method that utilizes double earth electrodes to strengthen plasma discharge under a gas flow environment is characterized in that the method that utilizes double earth electrodes to strengthen plasma discharge under the gas flow environment is carried out according to the following steps: 将放电装置的两级设置在气流出口使得气体在放电装置的两级之间进行电离；所述的放电装置的两级分别是高压电极和地电极，且放电装置的两级平行，放电装置的放电方向与气流方向垂直；放电装置的高压电极与高频高压脉冲电源的正极连接，放电装置的地电极与高频高压脉冲电源的负极连接；放电装置的地电极分为上游地电极和下游地电极，上游地电极和下游地电极并联，且上游地电极和下游地电极沿着气流方向并列布置，上游地电极靠近气流出口，下游地电极远离气流出口；The two stages of the discharge device are arranged at the air flow outlet so that the gas is ionized between the two stages of the discharge device; the two stages of the discharge device are respectively the high voltage electrode and the ground electrode, and the two stages of the discharge device are parallel, and the two stages of the discharge device are parallel. The discharge direction is perpendicular to the airflow direction; the high-voltage electrode of the discharge device is connected to the positive electrode of the high-frequency high-voltage pulse power supply, and the ground electrode of the discharge device is connected to the negative electrode of the high-frequency high-voltage pulse power supply; the ground electrode of the discharge device is divided into an upstream ground electrode and a downstream ground electrode. Electrodes, the upstream ground electrode and the downstream ground electrode are connected in parallel, and the upstream ground electrode and the downstream ground electrode are arranged side by side along the airflow direction, the upstream ground electrode is close to the airflow outlet, and the downstream ground electrode is far away from the airflow outlet; 高压电极沿着气体流动方向的长度大于等于上游地电极沿着气体流动方向的长度L1、上游地电极与下游地电极之间的距离L2和下游地电极沿着气体流动方向的长度L3三个尺寸的总和；The length of the high voltage electrode along the gas flow direction is greater than or equal to the length L 1 of the upstream ground electrode along the gas flow direction, the distance L 2 between the upstream ground electrode and the downstream ground electrode, and the length L 3 of the downstream ground electrode along the gas flow direction the sum of the three dimensions; 在高频高压脉冲电源的脉冲间隔时间内，气体的输运距离大于等于L2且小于等于L1+L2+L3，即L2≤v·tp≤L1+L2+L3，v是气体的流动速度，tp是高频高压脉冲电源的脉冲周期。During the pulse interval of the high-frequency high-voltage pulse power supply, the gas transport distance is greater than or equal to L 2 and less than or equal to L 1 +L 2 +L 3 , that is, L 2 ≤v·t p ≤L 1 +L 2 +L 3 , v is the flow velocity of the gas, and t p is the pulse period of the high-frequency high-voltage pulse power supply. 2.根据权利要求1所述的一种气体流动环境下利用双地电极强化等离子体放电的方法，其特征在于所述的高频高压脉冲电源的脉冲宽度为纳秒～微秒级。2 . The method according to claim 1 , wherein the method for enhancing plasma discharge by using double ground electrodes in a gas flow environment is characterized in that the pulse width of the high-frequency high-voltage pulse power supply is in the order of nanoseconds to microseconds. 3 . 3.根据权利要求1所述的一种气体流动环境下利用双地电极强化等离子体放电的方法，其特征在于所述的高频高压脉冲电源的脉冲频率大于0且小于50KHz。3 . The method according to claim 1 , wherein the method of using double ground electrodes to strengthen plasma discharge in a gas flow environment is characterized in that the pulse frequency of the high-frequency high-voltage pulse power supply is greater than 0 and less than 50KHz. 4 . 4.根据权利要求1所述的一种气体流动环境下利用双地电极强化等离子体放电的方法，其特征在于所述的高压电极下方粘贴绝缘支撑，地电极下方粘贴绝缘支撑。4 . The method of using double ground electrodes to strengthen plasma discharge in a gas flow environment according to claim 1 , wherein an insulating support is pasted below the high-voltage electrode, and an insulating support is pasted below the ground electrode. 5 . 5.根据权利要求1所述的一种气体流动环境下利用双地电极强化等离子体放电的方法，其特征在于当气体的流动速度v为恒定时，且放电电装置的结构固定时，通过调节放电频率来调节输出强度，且满足L2≤v/f≤L1+L2+L3；5. The method of utilizing double-earth electrodes to strengthen plasma discharge under a gas flow environment according to claim 1, wherein when the flow velocity v of the gas is constant, and the structure of the discharge electrical device is fixed, by adjusting Discharge frequency to adjust output intensity, and satisfy L 2 ≤v/f≤L 1 +L 2 +L 3 ; 当放电频率固定时，通过改变放电装置结构的方式来调节输出强度，且满足L2≤v/f≤L1+L2+L3。When the discharge frequency is fixed, the output intensity is adjusted by changing the structure of the discharge device, and L 2 ≤v/f≤L 1 +L 2 +L 3 is satisfied.
CN201811604633.8A 2018-12-26 2018-12-26 Strengthen the method for plasma discharges under a kind of gas flowing environment using double ground electrodes Pending CN109462930A (en)

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