本文關(guān)鍵詞： 平面激光誘導(dǎo)熒光 NO分布特性 平焰燃燒器 ICCD關(guān)鍵參數(shù)　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著社會(huì)文明和科學(xué)技術(shù)的快速發(fā)展,人類開始進(jìn)行大規(guī)模的物質(zhì)生產(chǎn)活動(dòng),生產(chǎn)活動(dòng)所產(chǎn)生的大量工業(yè)垃圾和生活垃圾,造成了嚴(yán)重的生態(tài)環(huán)境污染,其中非常值得關(guān)注的就是大氣污染。目前我國大氣污染問題尤為嚴(yán)重,尤其是北方各大城市出現(xiàn)的霧霾、PM2.5值偏高等現(xiàn)象已經(jīng)為人們敲響了警鐘。大氣污染主要來源于工業(yè)廢氣、生活燃煤、汽車尾氣等。其中以一氧化氮為主的氮氧化合物是主要的氣體狀態(tài)污染物之一。為了了解汽車尾氣和煤炭燃燒產(chǎn)生的NO氣體時(shí)空分布特性,進(jìn)一步改善控制氮氧化合物排放的燃燒設(shè)備,本文將應(yīng)用平面激光誘導(dǎo)熒光(Planar Laser-Induced fluorescence,簡稱PLIF)方法研究甲烷/空氣預(yù)混火焰尾焰中一氧化氮分子的時(shí)間和空間分布特性。PLIF測(cè)量方法主要是將激光整形成片狀光束,將粒子激發(fā)到高能態(tài),通過測(cè)量從高能態(tài)躍遷到低能態(tài)的熒光來獲取某個(gè)截面的信息,通過改變激發(fā)位置,即可獲取流場任意空間位置的熒光信息。NO-PLIF(Planar Laser-Induced fluorescence of Nitric Oxide,簡稱NO-PLIF)測(cè)量方法就是利用PLIF技術(shù)獲取流場中NO分子任意時(shí)間、空間位置的熒光信息。本文首先研究了NO分子躍遷能級(jí)系統(tǒng)的理論公式,確定了NO-PLIF信號(hào)強(qiáng)度與入射激光能量、NO分子數(shù)密度等變量和熒光輻射效率、探測(cè)系統(tǒng)常量的關(guān)系;同時(shí)應(yīng)用LIFBASE仿真軟件對(duì)NO分子X2∏→A2∑(0,0)躍遷能級(jí)的吸收系數(shù)進(jìn)行仿真,確定選擇NO分子激發(fā)波長的范圍,校正激光器波長的偏移量在1.9~4.2pm范圍內(nèi),選出了NO分子躍遷分支為Q1(12)+Q12(20)+Q2(20)(226.033nm),選出了激光器波長為226.029nm;根據(jù)棱鏡分光原理對(duì)入射激光能量進(jìn)行定標(biāo),實(shí)現(xiàn)了激光能量的實(shí)時(shí)檢測(cè);實(shí)驗(yàn)時(shí)首先令入射激光能量在0.1~1.1m J范圍內(nèi)變化,驗(yàn)證了NO-PLIF信號(hào)強(qiáng)度隨著入射激光能量的增加而增加,證明此時(shí)激光能量較弱,PLIF信號(hào)強(qiáng)度未飽和,滿足實(shí)驗(yàn)條件;其次通過控制變量法選出ICCD相機(jī)最佳延時(shí)為133ns,最佳門寬為20ns,最佳累計(jì)次數(shù)為20次;最后,在滿足NO-PLIF技術(shù)的最佳實(shí)驗(yàn)條件下,改變預(yù)混氣體當(dāng)量比0.7~1.3,實(shí)驗(yàn)結(jié)果表明NO-PLIF信號(hào)強(qiáng)度隨著當(dāng)量比的增加而增加,平行于燃燒器表面方向的NO分布較均勻,同時(shí)應(yīng)用羅丹明染料對(duì)激發(fā)激光能量的縱向分布進(jìn)行修正,修正后不同當(dāng)量比下NO-PLIF信號(hào)強(qiáng)度隨著高度的增加有微弱的下降趨勢(shì),說明此時(shí)NO濃度隨著高度的增加而減少。
[Abstract]:With the rapid development of social civilization and science and technology, human began to carry out large-scale material production activities, the production of a large number of industrial waste and domestic waste, resulting in serious ecological pollution. The problem of air pollution in China is especially serious at present, especially the haze that appears in the big cities in the north. The phenomenon of high PM2.5 value has sounded the alarm for people. Air pollution mainly comes from industrial waste gas and coal burning in daily life. In order to understand the spatial and temporal distribution characteristics of no gas produced by automobile exhaust and coal combustion, the nitrogen and oxygen compounds, which are mainly nitric oxide, are one of the main gaseous pollutants. To further improve the combustion equipment for nitrogen oxide emission control, planar laser-induced fluorescence planar Laser-Induced fluorescence will be used in this paper. The temporal and spatial distribution of nitric oxide in methane / air premixed flame tail flame is studied by PLIF.The main method of PLIF measurement is to shape the laser beam into a flake beam. The particle is excited to the high-energy state, the fluorescence from the high-energy state to the low-energy state is measured to obtain the information of a cross section, and the excitation position is changed. The fluorescence information of any spatial position of the flow field. NO-PLIFF can be obtained. Planar Laser-Induced fluorescence of Nitric Oxide. The measurement method of NO-PLIFI is to use PLIF technology to obtain the arbitrary time of no molecule in the flow field. In this paper, the theoretical formula of the transition level system of no molecule is studied, and the intensity of NO-PLIF signal and the incident laser energy are determined. No molecular number density and other variables and fluorescence radiation efficiency, detection system constant relationship; At the same time, the LIFBASE simulation software is used to simulate the no molecule X2 蟺. 鈫扵he absorption coefficient of A _ 2 鈭，

本文編號(hào)：1490261