Bessler Wolfgang G, Schulz Christof, Lee Tonghun, Jeffries Jay B, Hanson Ronald K
Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Germany.
Appl Opt. 2002 Jun 20;41(18):3547-57. doi: 10.1364/ao.41.003547.
Three different high-pressure flame measurement strategies for NO laser-induced fluorescence (LIF) with A-X(0,0) excitation have been studied previously with computational simulations and experiments in flames up to 15 bars. Interference from O2 LIF is a significant problem in lean flames for NO LIF measurements, and pressure broadening and quenching lead to increased interference with increased pressure. We investigate the NO LIF signal strength, interference by hot molecular oxygen, and temperature dependence of the three previous schemes and for two newly chosen excitation schemes with wavelength-resolved LIF measurements in premixed methane and air flames at pressures between 1 and 60 bars and a range of fuel/air ratios. In slightly lean flames with an equivalence ratio of 0.83 at 60 bars, the contribution of O2 LIF to the NO LIF signal varies between 8% and 29% for the previous schemes. The O2 interference is best suppressed with excitation at 226.03 nm.
先前已经通过计算模拟和在高达15巴的火焰中的实验，研究了三种不同的用于A-X(0,0)激发的NO激光诱导荧光（LIF）的高压火焰测量策略。在贫燃火焰中，O2 LIF的干扰是NO LIF测量中的一个重大问题，并且压力展宽和猝灭会导致随着压力增加干扰也增加。我们通过在1至60巴的压力和一系列燃料/空气比下，对预混甲烷和空气火焰进行波长分辨LIF测量，研究了之前三种方案以及两种新选择的激发方案的NO LIF信号强度、热分子氧的干扰和温度依赖性。在60巴下当量比为0.83的微贫火焰中，对于之前的方案，O2 LIF对NO LIF信号的贡献在8%至29%之间变化。在226.03 nm处激发时，O2干扰得到最佳抑制。
