CAJ | 학술논문

基于TDLAS（tunable diode laser absorption spectroscopy）技术，以水汽作为目标气体，采用直接吸收的测量方式，探测了甲烷空气预混平焰炉燃烧区域水汽的吸收光谱信号，通过ART （algebraic reconstruc‐tion technique）代数迭代算法对燃烧场温度和水汽浓度分布进行了模拟重建和实验研究，模拟重建采取5×5共25个网格的正方形重建区域，假定25个网格的一个温度浓度二维分布，模拟28条激光束从不同的角度方位穿越重建区域，得到模拟射线下的投影值，经ART算法重建，结果显示温度场和水汽浓度场的重建偏差均在1％以内。实验采用分布反馈式激光器作为光源，选取 H2 O的7153.722，7153.748和7154.354 cm －1三条吸收线作为测温谱线，其中前两条线不区分作为一条吸收线来处理。使用平移台多方位平行扫描，共获取30路光谱吸收信号，经数据处理、算法重建和双线比值法测温原理得到了圆形平焰炉16个不同区域的温度浓度值，且炉面偏向中心区域温度浓度值较高，边缘较小，结果表明代数迭代算法能够很好地实现燃烧区域温度场和水汽浓度场的反演。
기우TDLAS（tunable diode laser absorption spectroscopy）기술，이수기작위목표기체，채용직접흡수적측량방식，탐측료갑완공기예혼평염로연소구역수기적흡수광보신호，통과ART （algebraic reconstruc‐tion technique）대수질대산법대연소장온도화수기농도분포진행료모의중건화실험연구，모의중건채취5×5공25개망격적정방형중건구역，가정25개망격적일개온도농도이유분포，모의28조격광속종불동적각도방위천월중건구역，득도모의사선하적투영치，경ART산법중건，결과현시온도장화수기농도장적중건편차균재1％이내。실험채용분포반궤식격광기작위광원，선취 H2 O적7153.722，7153.748화7154.354 cm －1삼조흡수선작위측온보선，기중전량조선불구분작위일조흡수선래처리。사용평이태다방위평행소묘，공획취30로광보흡수신호，경수거처리、산법중건화쌍선비치법측온원리득도료원형평염로16개불동구역적온도농도치，차로면편향중심구역온도농도치교고，변연교소，결과표명대수질대산법능구흔호지실현연소구역온도장화수기농도장적반연。
We specify water vapor among combustion products as the target gas based on tunable diode absorption spectroscopy in this paper .The direct absorption signals of water vapor after being processed can be used to calculate the gas concentration distributions and temperature distributions of the combustion region of methane and air flat flame furnace via algebraic recon‐struction technique (ART) .In the numerical simulation ,reconstruction region is a grid of five by five ,we assume a temperature and water vapor concentration distribution of 25 grid ,then simulate different direction laser rays which cross the combustion re‐gion ,generating projection of each ray ,by ART reconstruction algorithm ,it turns out that the temperature and water vapor dis‐tribution reconstruction error is less than 1% .In the experiment ,we chose a distributed‐feedback laser to scan the target gas H2O 7 153.722 ,7 153.748 and 7 154.354 cm-1 as absorbtion line pair to measure temperature of the flame ,we consider the for‐mer two line as one absorbtion line .By Stages multi‐directional scanning ,the authors abtain 16 different regions distributin of temperature and gas concentration of furnace when we collecte 30 different angle data by spectral data processing ,reconstruction algorithm ,two absorbtion line ratio method for temperature sensing ,finding the temperature and water concentration are higher in the center than in the edge ,it turns out that the reconstruction algorithm is good enough to achieve the distributions of gas concentration and temperature of the combustion region .