本文選題：沿面放電 + 放電模式�。� 參考：《大連理工大學(xué)》2016年博士論文

【摘要】：與傳統(tǒng)的體相介質(zhì)阻擋放電相比,沿面型介質(zhì)阻擋放電更容易產(chǎn)生大面積等離子體層,并可以有效控制邊界層氣流分布,近年來在材料表面處理、等離子體流動控制、生物醫(yī)學(xué)等領(lǐng)域表現(xiàn)出良好的應(yīng)用前景。目前,放電模式轉(zhuǎn)換機(jī)理和均勻性控制是沿面型介質(zhì)阻擋放電研究中的兩個(gè)重要方向。本文通過發(fā)射光譜、高速圖像采集和數(shù)值仿真的方法對大氣壓空氣中沿面放電的模式轉(zhuǎn)換和均勻性等進(jìn)行了研究。主要研究內(nèi)容和結(jié)論如下：1.建立了一套大氣壓沿面型介質(zhì)阻擋放電裝置和光學(xué)診斷系統(tǒng),設(shè)計(jì)了一個(gè)延時(shí)僅為10ns的同步觸發(fā)控制系統(tǒng),用于實(shí)時(shí)觸發(fā)ICCD相機(jī)以捕捉瞬態(tài)放電過程。2.利用發(fā)射光譜技術(shù)和電流電壓探測技術(shù),研究了不同放電參數(shù)對發(fā)射光譜、電子激發(fā)溫度、轉(zhuǎn)振溫度的影響及其空間分布規(guī)律。結(jié)果表明,電子激發(fā)溫度沿軸向放電間隙變化不大,而沿徑向最大值出現(xiàn)在暴露電極邊緣。隨著峰值電壓升高,氧原子的電子激發(fā)溫度和氮分子的轉(zhuǎn)振溫度均隨之增大。3.利用ICCD高速相機(jī)對大氣壓空氣沿面型介質(zhì)阻擋放電的徑向發(fā)展和模式轉(zhuǎn)換過程進(jìn)行了研究,觀察到在正、負(fù)向電壓階段呈現(xiàn)出兩種不同的放電模式,即絲狀放電和彌散放電。利用時(shí)空分辨光譜測量的方法比較了絲狀放電模式和彌散放電模式的發(fā)射光譜和轉(zhuǎn)動溫度,并分析了兩種放電模式發(fā)生轉(zhuǎn)換的原因。結(jié)果表明,絲狀放電通道內(nèi)的高能電子數(shù)密度大于彌散放電；隨著絲狀放電向彌散放電的轉(zhuǎn)換,氮分子的轉(zhuǎn)動溫度減��；介質(zhì)板表面積累的帶電粒子以及表面二次電子發(fā)射,是導(dǎo)致正、負(fù)向電壓階段放電不對稱性的主要原因。4.通過提取閾值后統(tǒng)計(jì)圖像的像素點(diǎn),對放電區(qū)域的面積進(jìn)行了檢測。同時(shí),提出了一種利用數(shù)字圖像處理技術(shù)中的灰度頻率分布曲線來判定放電均勻性的方法,并討論了激勵(lì)頻率、氣體成分、氣速、介質(zhì)材料和厚度對沿面放電均勻性的影響。結(jié)果表明,本實(shí)驗(yàn)條件下電源頻率對沿面放電均勻性的影響較��；惰性氣體的加入有利于均勻放電的形成；氣速的增加對絲狀放電有一定的抑制作用；介電常數(shù)較大的陶瓷作為阻擋介質(zhì)時(shí)放電均勻性較好,介質(zhì)厚度的減小可以有效減弱絲狀放電的發(fā)展。5.利用大氣壓空氣沿面放電二維流體力學(xué)模型,對介質(zhì)表面電荷密度的周期演變過程及電場強(qiáng)度的時(shí)空分布進(jìn)行了詳細(xì)分析,驗(yàn)證了一個(gè)電壓周期內(nèi)放電的不對稱性,并模擬了激勵(lì)電壓、介質(zhì)材料及電極配置對空氣中沿面放電的影響。結(jié)果表明,放電區(qū)域中的電子雪崩導(dǎo)致初始電場分布發(fā)生改變；在電子密度最大位置處場強(qiáng)增大,反向電壓階段電子數(shù)密度最大可達(dá)3.6×10。6 m-3；最大電子密度隨電壓峰值的增大而增大,具有較高電子密度的區(qū)域也隨之?dāng)U大。介質(zhì)板二次電子發(fā)射系數(shù)的增加有效的減小了氣隙擊穿電壓�；瑒有脱孛娣烹娊Y(jié)構(gòu)有利于產(chǎn)生大面積等離子體層。
[Abstract]:Compared with the traditional bulk dielectric barrier discharge, the dielectric barrier discharge along the face type is more likely to produce a large area of plasma layer, and can effectively control the distribution of air flow in the boundary layer. In recent years, it has shown good application prospects in the fields of material surface treatment, plasma flow control, biomedicine and other fields. The uniformity control is the two important direction in the study of the surface dielectric barrier discharge. This paper studies the mode conversion and uniformity of the discharge along the surface of atmospheric pressure air through the emission spectrum, high speed image acquisition and numerical simulation. The main contents and conclusions are as follows: 1. a set of atmospheric pressure along the face type dielectric resistance is established. A synchronous trigger control system with time delay of only 10ns is designed to trigger a ICCD camera to capture transient discharge process in real time..2. uses emission spectrum technology and current voltage detection technology to study the influence of different discharge parameters on the emission spectrum, electron excitation temperature, and vibration temperature and its space. The results show that the electron excitation temperature varies little along the axial discharge gap, and the maximum value along the radial direction appears at the edge of the exposed electrode. With the increase of the peak voltage, the electron excitation temperature of oxygen atom and the transfer temperature of nitrogen molecules increase with the.3. ICCD high-speed phase machine. There are two different modes of discharge in the positive and negative voltage stages, that is, filamentous discharge and dispersion discharge. The firing and rotation temperatures of filamentous discharge mode and dispersion discharge mode are compared by means of space-time resolution spectroscopy, and two kinds of discharge modes are analyzed. The results show that the number density of high energy electrons in the filamentous discharge channel is larger than the dispersion discharge, and with the conversion of the filamentous discharge to the dispersion discharge, the rotational temperature of the nitrogen molecules decreases; the charged particles accumulated on the surface of the dielectric plate and the two electron emission on the surface lead to the asymmetry in the positive and negative voltage stages. The main reason for.4. is to detect the area of the discharge region by extracting the pixel points of the image after extracting the threshold value. At the same time, a method to determine the uniformity of discharge is proposed by using the gray frequency distribution curve in the digital image processing technology. The excitation frequency, the composition of the gas body, the gas velocity, the dielectric material and the thickness of the discharge are discussed. The results show that the influence of the power frequency on the uniformity of discharge along the surface is less; the addition of inert gas is beneficial to the formation of uniform discharge; the increase of gas velocity has a certain inhibitory effect on the filamentous discharge; the dielectric thickness is better and the dielectric thickness is better when the dielectric constant is larger. The reduction of the filamentous discharge can effectively reduce the development of the filamentous discharge.5. using the two-dimensional hydrodynamic model of the atmospheric pressure air discharge. The periodic evolution of the charge density on the surface of the medium and the spatial and temporal distribution of the electric field intensity are analyzed in detail. The asymmetry of the discharge in a voltage cycle is verified, and the excitation voltage and dielectric material are simulated. The effect of the electrode configuration on the discharge in the air along the surface shows that the electronic avalanche in the discharge region causes the change of the initial electric field distribution, the maximum electron density at the maximum electron density and the maximum electron density in the reverse voltage phase can reach 3.6 * 10.6 M-3, and the maximum electron density increases with the increase of the voltage peak, which is higher. The area of the electron density also expands. The increase of the two electron emission coefficient of the dielectric plate reduces the air gap breakdown voltage effectively. The sliding surface discharge structure is beneficial to the production of large area plasma layer.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：O461.2

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