Carrivain Olivier, Orain Mikael, Dorval Nelly, Morin Celine, Legros Guillaume
1 ONERA - The French Aerospace Lab, Palaiseau, France.
2 ONERA - The French Aerospace Lab, Mauzac, France.
Appl Spectrosc. 2017 Oct;71(10):2353-2366. doi: 10.1177/0003702817709439. Epub 2017 May 19.
Two-photon excitation laser-induced fluorescence of carbon monoxide (CO-LIF) is investigated experimentally in order to determine the applicability of this technique for imaging CO concentration in aeronautical combustors. Experiments are carried out in a high temperature, high-pressure test cell, and in a laminar premixed CH/air flame. Influence of temperature and pressure on CO-LIF spectra intensity and shape is reported. The experimental results show that as pressure increases, the CO-LIF excitation spectrum becomes asymmetric. Additionally, the spectrum strongly shifts to the red with a quadratic dependence of the collisional shift upon pressure, which is different from the classical behavior where the collisional shift is proportional to pressure. Moreover, pressure line broadening cannot be reproduced by a Lorenztian profile in the temperature range investigated here (300-1750 K) and, therefore, an alternative line shape is suggested.
为了确定双光子激发激光诱导一氧化碳荧光（CO-LIF）技术在航空燃烧器中一氧化碳浓度成像方面的适用性，对其进行了实验研究。实验在高温、高压测试腔内以及层流预混CH/空气火焰中进行。报告了温度和压力对CO-LIF光谱强度和形状的影响。实验结果表明，随着压力增加，CO-LIF激发光谱变得不对称。此外，光谱强烈向红色方向移动，碰撞位移与压力呈二次方关系，这与碰撞位移与压力成正比的经典行为不同。而且，在此处研究的温度范围（300 - 1750 K）内，洛伦兹分布无法再现压力导致的谱线展宽，因此建议采用另一种谱线形状。
