激光诱导荧光光谱燃烧测温技术研究

INVESTIGATION ON COMBUSTION TEMPERATURE MEASU-REMENT USING LASER INDUCED FLUORESCENCE

基于分子激发态振动能级粒子碰撞能量弛豫过程的理论,本文提出了一种可望实现瞬态燃烧温度测量的新技术——激光诱导分子热助振动荧光光谱技术。建立了分于激发态振动能级粒子碰撞能量弛豫过程的四能级系统模型,以BaCl分子为对象实验研究了激光诱导热助振动荧光光谱的特性,通过以5170波长选择激发BaCl的C^2Ⅱ_(1/2)(v=1)←→)X^2∑(v=0)能级跃迁,对液化石油气/空气预混火焰温度进行了实验测量。

Based upon the theory of collisional energy relaxation of populations among the vibratio-nal energy levels in the excited molecule state, a new method called Laser Induced Thermally-assisted Vibrational Fluorescence (LITVF), which is desired to be used for transient combustion temperature measurement, was proposed. The four-level system model for collisional energy relaxation process among the vibrational levels was established. By using 5170A to excite the transition of C2sssssssssssssssssssssssssssssss1/2(v= 1) X23333333333333333333333333333333(v= 0), the LITVF spectra of BaCl were obtained in the seeded premixed liquefied petroleum gas/air flame, from which the temperature were calculated.