Laser-saturated fluorescence of nitric oxide and chemiluminescence measurements in premixed ethanol flames

Experiments and simulations of NOx formation in the combustion of hydroxylated fuels

“…The authors showed that for most butanol isomers lower levels of NO were formed, except for isobutanol, and assert that consistently lower NO was formed through both prompt and thermal mechanisms. Additionally, Marques et al [11] studied NO in ethanol flames using NO and CH⁄ laser-saturated fluorescence observing a strong correlation between CH⁄ and NO profiles and attribute the NO formed to the prompt NO mechanism. In these studies, the lower NO x formation observed in the alcohol flames is often attributed to a reduction in prompt NO and CH radical concentrations with little discussion of the cause of the reduced radical pool and few supporting experiments.…”

Effects of CH4 Content on NO Formation in One-Dimensional Adiabatic Flames Investigated by Saturated Laser-Induced Fluorescence and CHEMKIN Modeling

“…The standard error for 3 repetitions did not exceed 6% for all measurement points. According to existing research, 19,42,43 there is consumption of NO by the flame, which leads to a linear signal response at low NO mole fraction cases while saturated response at high NO mole fraction cases creates a plateau initiating around 100 ppm. 13 In this work, saturation limits were evaluated by increasing the NO mole fraction in 15 ppm per step from nonseeded to 90 ppm.…”

“…17 Gimeńez-Loṕez et al experimentally and numerically studied the HCN radical which is an important intermediate in NO formation and removal for O 2 −CO 2 atmosphere. 18 Marques et al found a strong connection between CH radical chemiluminescence and NO formation in premixed ethanol flames, 19 which led to the identification of prompt NO as the governing mechanism for NO production in their reaction system. Wang et al published results 20 of NO formation in an adiabatic H 2 −CO syngas flame, finding that several widely used mechanisms overpredict NO mole fraction in premixed combustion.…”

Variations in non-thermal NO formation pathways in alcohol flames

“…However, relatively little work has investigated the nature of NO formation specific to alcohol fuels. Several works have measured NO formation in premixed methanol [18] and ethanol [19,20] flames. Chung et al [21] conducted a comparison of NO formation in iso-and n-butanol isomers with those of butane.…”