Temperature Measurement with a Conditional Two-line OH-PLIF Technique in an Actively Controlled Coaxial Jet Flame
Temperature Measurement with a Conditional Two-line OH-PLIF Technique in an Actively Controlled Coaxial Jet Flame
复制标题
在主动控制同轴射流火焰中采用条件两线 OH-PLIF 技术进行温度测量
DOI：
10.1299/kikaib.73.1678
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
N. Kasagi
中科院分区：
文献类型：
--
作者：
Y. Saiki;N. Kurimoto;Yuji Suzuki;N. Kasagi
提出了一种基于双线OH平面激光诱导荧光（PLIF）的火焰温度测量新技术。为了利用单激光器和单ICCD摄像机测量非稳态火焰的温度，提出了一种新的条件图像处理方法。在该方法中，系综平均OH荧光强度在火焰前锋，这是采取两条激发线，被用来计算在每个流向位置的平均温度。本测温应用于甲烷/空气同轴射流火焰，这是主动控制的周期性驱动的磁瓣致动器。在平均火焰温度为2000 K时，在95%覆盖率下的不确定度区间估计为+130 K和-120 K。控制火焰的实测平均温度与理论绝热火焰温度在不确定区间内相吻合。当供给化学计量的混合气时，平均火焰温度最高（-2200K），因此CO排放大大降低。当供给稀可燃极限混合气时，平均温度降低到1600K，导致CO排放增加。
A novel flame temperature measurement technique based on two-line OH planar laser-induced fluorescence (PLIF) is presented. In order to measure temperature of an unsteady flame using a single excitation laser and a single ICCD camera, a new conditional image processing method has been introduced. In this method, ensemble-averaged OH fluorescence intensities at the flame front, which are taken by two excitation lines, are used, and the mean temperature at each streamwise position is calculated. The present thermometry is applied to a methane/air coaxial jet flame, which is actively controlled by periodically driven magnetic flap actuators. The uncertainty interval at 95% coverage is estimated as +130 K and -120 K at the mean flame temperature of 2000 K. The measured mean temperatures of controlled flames coincide with the theoretical adiabatic flame temperatures within the uncertainty intervals. When the stoichiometric mixture is supplied, the mean flame temperature is the highest (-2200K), and thus CO emission is drastically reduced. On the other hand, when a lean flammable limit mixture is supplied, the mean temperature is decreased to 1 600 K, and this results in the increased CO emission.