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  本文關鍵詞：激光誘導熒光技術診斷大氣壓介質阻擋放電中OH時空分布　出處：《大連理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 針-板DBD 放電模式 OH自由基 LIF ICCD成像 OH產生效率

【摘要】：本文主要介紹了使用時序非同步的激光誘導熒光(LIF)技術對大氣壓He-H20(0.4%)針-板介質阻擋放電(DBD)等離子體中基態(tài)OH自由基平均相對濃度進行測量,同時對OH平均相對濃度隨外加電壓的變化進行研究,并且利用ICCD成像系統(tǒng)對放電中的發(fā)射光譜和熒光光譜進行拍攝,通過發(fā)射光譜和熒光光譜的空間分布數(shù)據(jù)對OH自由基主要產生機制進行研究。本文主要研究內容包括：(1)設計和建立針-板介質阻擋放電系統(tǒng)和濕度調控系統(tǒng),并將其與激光誘導熒光診斷系統(tǒng)進行整合最終實現(xiàn)OH自由基診斷。(2)利用時序非同步的L1F技術對針-板介質阻擋放電中OH自由基濃度相對漲落程度進行測量,結果顯示所有的相對漲落均在±35%之內,其中約90%的熒光強度的相對漲落在±15%之內,并且隨著外加電壓的升高相對漲落逐漸減小,因此表明介質阻擋放電中OH平均相對濃度可以利用時序非同步的LIF技術進行測量。(3)在外加電壓從1.4KV增加到4.OKV的過程中放電出現(xiàn)四種不同的模式,通過對四種模式的電壓-電流波形圖和ICCD放電成像分析可知放電模式分別為：負電暈介質阻擋放電、輝光放電、多脈沖輝光放電和絲狀放電,并且對四種放電模式的放電機制進行了討論。(4)利用時序非同步的LIF技術研究OH平均相對濃度隨外加電壓的變化,發(fā)現(xiàn)OH平均相對濃度隨外加電壓的升高同樣分為四個區(qū)段,并且利用ICCD對放電中的發(fā)射光譜和OH熒光光譜進行成像,通過空間分布信息對四種放電模式中OH自由基產生機制進行研究,結果表明負電暈放電中OH自由基產生機制主要為電子直接碰撞解離過程,另外三種放電模式中OH自由基產生機制主要為He亞穩(wěn)態(tài)的潘寧電離過程。(5)定義單位注入功率下OH產生效率,同時研究OH產生效率隨外加電壓的變化趨勢,結果表明負電暈放電是單位注入功率下OH產生效率最高的放電模式,而絲狀放電是OH產生效率最低的放電模式。
[Abstract]:This paper mainly introduces the synchronization of laser induced fluorescence (LIF) using non timing technology on atmospheric He-H20 (0.4%) needle plate dielectric barrier discharge (DBD) measurement of the average relative concentration of free radicals in the plasma of the ground state of OH, while the OH average relative concentration varying with the applied voltage are studied, and the use of ICCD imaging system the emission spectrum and fluorescence spectrum of discharge for the film, through the emission spectrum and fluorescence spectrum of the spatial distribution of data on the OH radical main mechanism were studied. The main contents of this paper include: (1) design and build a needle plate dielectric barrier discharge system and humidity control system, and the laser induced fluorescence the diagnosis system integration and ultimately OH radical diagnosis. (2) the use of non synchronous L1F technology on the discharge in OH radical concentration fluctuation extent of measurement block needle plate dielectric timing results Show all the relative fluctuation is within 35%, which is about 90% of the fluorescence intensity relative fluctuation is within 15%, and with the increase of applied voltage fluctuation decreases gradually, so that the dielectric barrier discharge OH average relative concentration can use timing synchronization technology of non LIF were measured. (3) an increase in the discharge voltage from 1.4KV to 4.OKV during the four different modes, the voltage of the four modes of current waveform and ICCD imaging analysis of discharge discharge mode respectively: negative corona dielectric barrier discharge, glow discharge, multi pulse glow and filamentary discharge, and the discharge mechanism of four kinds of discharge mode are discussed. (4) the use of sequential non OH study of LIF synchronous average relative concentration with the applied voltage changes, found that the average relative OH concentration with the increase of applied voltage is also divided into four sections , and the use of ICCD imaging of emission spectra and fluorescence spectra of OH in the discharge, the spatial distribution information of four kinds of OH radicals generated in the discharge mode, mechanism research, results show that the formation mechanism of OH radical negative corona discharge mainly electronic direct impact dissociation process, the other three OH free radicals in discharge mode the main mechanism of He metastable Penning ionization process. (5) the definition of unit power injection of OH and OH on the production efficiency, production efficiency with the applied voltage changes, results show that the negative corona discharge is a unit of injection power under OH mode discharge efficiency is the highest, which is OH filamentary discharge discharge mode efficiency is the lowest.

【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN249;O461.2

【參考文獻】

相關博士學位論文 前1條

1 張家良;低溫等離子體發(fā)射光譜學研究[D];大連理工大學;2002年

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本文編號：1422526