
Nathalie LamoureuxUniversity of Lille · Laboratoire de Physicochimie des Processus de Combustion et de l'Atmophère (PC2A)
Nathalie Lamoureux
PhD, HDR
About
47
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Introduction
Nathalie Lamoureux currently works at the Laboratoire de Physicochimie des Processus de Combustion et de l'Atmophère (PC2A), Université de Lille. Nathalie does research in Spectroscopy, Chemical Kinetics and Experimental Physics.
Publications
Publications (47)
Oxygenated biofuels work as a promising renewable alternative. Despite the fact that biofuels tend to decrease the soot emissions, they may lead to new emission problems such as the formation of aldehydes (notably formaldehyde and acetaldehyde). In this study, experimental work is carried out to analyze the chemical processes involved during combus...
In recent years, two-photon laser-induced fluorescence (TPLIF) of inert gas krypton (Kr) has received much attention as a potential non-intrusive flow diagnostic, thermometry, and velocimetry technique. However, the interaction between the laser bandwidth and the atomic excitation transition at varying pressures, and the variation of the fluorescen...
The cyanonitrene radical, NCN, has been shown in the last two decades to play a crucial role in the formation of prompt-NO in combustion. This has stimulated a large number of experimental and theoretical studies on fundamental physico-chemical properties of NCN as well as on mechanistic and kinetic aspects of NCN reactions under combustion conditi...
Flame-sampling experiments allow describing the species profiles in function of the height above the burner. Even with microprobes as those generally used for Gas Chromatography measurements, the perturbations induced by the microprobe can be non-negligible. Not only the heat losses due to its presence will affect the temperature and the spatial po...
In this work, the two-photon laser-induced fluorescence technique (TPLIF) was applied to measure the concentration profile of atomic hydrogen in low-pressure laminar premixed flames. Excitation of H-atoms was performed by two-photon absorption at 205 nm and collecting the fluorescence at 656.3 nm. For the first time in flames, the TPLIF signals fro...
Lignocellulosic tetrahydrofuranic (THF) biofuels have been identified as promising fuel candidates for spark-ignition (SI) engines. To support the potential use as transportation biofuels, fundamental studies of their combustion and emission behavior are highly important. In the present study, the high-temperature (HT) combustion chemistry of tetra...
An automated spectral fitting algorithm (named Thermo NO-LIF) designed for the extraction of temperature information from experimental NO-LIF spectra is presented and analysed. With the aid of the Thermo NO-LIF, the high-accuracy (0.5%) of multi-line NO-LIF thermometry are demonstrated in the burnt-gases region of a near-adiabatic Bunsen-type premi...
Quantification of the O-atom concentration is particularly important for testing the detailed kinetic mechanisms in flames. In this work, relative concentrations of O-atoms are measured by using the two-photon Laser-Induced Fluorescence method (TPLIF). The direct calibration for determining the absolute O-atom mole fraction is achieved by comparing...
This paper presents an experimental and modelling study of NO formation in high pressure premixed flames. Experiments were performed in a high-pressure counterflow burner in which laminar premixed CH4/air flames were stabilised at equivalence ratios of E.R = 0.7, 1 and 1.2 and for pressures varying from 0.1 to 0.7 MPa. We report quantitative NO mol...
The present study introduces new laminar burning velocity data for ammonia/hydrogen/air mixtures measured by means of the outwardly propagating spherical flame method at atmospheric pressure, for previously unseen unburned gas temperatures ranging from 298 to 473 K, hydrogen fractions ranging from 0 vol% to 60 vol% in the fuel and equivalence ratio...
NH is a key short-lived radical involved in the prompt-NO formation. Quantification of NH is thus particularly important for testing the NO kinetic mechanisms. However, quantitative measurements of native NH in hydrocarbon/oxygen/nitrogen flames remain very scarce. Therefore, in this work, the mole fractions of native NH were obtained using a combi...
The impact of the methyl butanoate (MB) oxidation in NO formation is examined in stoichiometric low pressure (5.3 kPa) flames. Flame structure analysis in three CH4/MB/O2/N2 flames was performed by using GC measurements. Focus was put on the prompt-NO formation in these flames thanks to laser based diagnostics allowing CH, NO and temperature profil...
During the PHEBUS-FP integral severe accidents simulation tests, gaseous iodine was detected in earlier stages of the simulated accident, coming from the experimental circuit modelling a reactor coolant system. One possible explanation is the existence of some kinetic limitations which promote the persistence of gaseous iodine at low temperature. T...
Species profiles measurements were performed by using Molecular Beam Mass Spectrometry in low pressure CH4/O2/N2 flames doped with NO, NH3 or NH3+NO. The present paper aims to study NO/NH3 conversion in hydrocarbon flames. It is based on the analysis of CH2/CH3 radicals and NO, NH3 and HCN species profiles. In NO doped flame, NO-reburning prevails,...
In this paper a detailed sub-mechanism NOMecha2.0 for NOx chemistry at high temperature is validated on a large experimental database obtained in flames, a jet-stirred reactor (JSR) and a plug-flow reactor under sub-atmospheric and atmospheric conditions. This sub-mechanism mainly based on the one implemented in the GDFkin®3.0_NCN model for prompt-...
Bimolecular reactions of the NCN radical play a key role for modeling prompt-NO formation in hydrocarbon flames. The rate constant of the so far neglected reaction NCN + H2 has been experimentally determined behind shock waves under pseudo-first order conditions with H2 as the excess component. NCN3 thermal decomposition has been used as a quantita...
Laser-induced incandescence (LII) measurements were conducted in a laminar flat rich premixed CH4/O2/N2 flame at atmospheric pressure using a Nd:YAG laser operated at 1,064 nm. Time-resolved LII signals were measured at 610 nm (20 nm FWHM) at different heights above the burner exit surface and at different laser fluences. The averaged soot temperat...
In the present work, measurements of absolute mole fraction profiles of CN and HCN were jointly performed in low pressure (5.3 kPa) premixed CH4/O2/N2 flames of three equivalent ratios (ϕ = 0.8–1.25). These species were the missing link of the database comprising CH, NCN, NCO and NO species previously acquired in Lille to improve detailed mechanism...
The present work aims to quantitatively measure HCN in a low pressure premixed CH4/N2O/O2/N2 flame after gas probe sampling. For that purpose, the (0 0 3)–(0 0 0) band of HCN has been selected for the first time for HCN monitoring. This band was chosen because it lies in a wavelength range (1.036 μm) easily reachable by commercial dye laser combine...
This paper presents the study we carried out on the formation of soot particles in low-pressure premixed CH4/O2/N2 flames by using Laser-Induced Incandescence (LII). Flames were stabilised at 26.6 kPa (200 torr). Four different equivalence ratios were tested (Φ = 1.95, 205, 2.15 and 2.32), Φ = 1.95 corresponding to the equivalence ratio for which L...
The initiation reaction of the prompt-NO mechanism in flames (CH + N2 = NCN + H) involves the NCN radical. This radical is a very minor species reaching only a few hundreds of ppb in mole fraction in hydrocarbon/air flames, which makes the experimental determination of its absolute concentration profile challenging. The aim of this study is (1) to...
NCO is a short-lived species involved in NO(x) formation. It has never been quantitatively measured in flame conditions. In the present study, laser-induced fluorescence (LIF) and cavity ring-down spectroscopy (CRDS) were combined to measure NCO radical concentrations in premixed low-pressure flames (p = 5.3 kPa). NCO LIF excitation spectrum and ab...
We report an experimental and modeling study on prompt-NO formation in low-pressure (5.3 kPa) premixed flames. Special emphasis is given to the quantitative detection (and prediction) of NCN, whose role in prompt-NO formation has recently been confirmed in alkane flames. Here a rich ({phi} = 1.25) CH{sub 4}-O{sub 2}-N{sub 2} flame and rich ({phi} =...
The present work has been performed to quantitatively determine the NCN radical concentration profile in a laminar low-pressure CH4/O2/N2 (ϕ = 1.25) flame. Laser induced fluorescence (LIF) technique has been implemented in order to record a NCN spectrum in the 326.7–330.1 nm range in flame conditions, and secondly to measure the spatially resolved...
Temperature measurements have been performed in a low-pressure flame by the technique of diode laser induced atomic fluorescence.
The experiments were done in a near-stoichiometric flat-flame of premixed methane, oxygen and nitrogen, at a pressure of 5.3
kPa. Indium atoms were seeded to the flame and probed using blue diode lasers; the lineshapes o...
This poster presents spatially resolved temperature measurements in low-pressure sooting flames using diode laser two-line atomic fluorescence (TLAF). Accurate temperature measurements are crucial in sooting flames due to the high temperature sensitivity of soot formation processes. The study demonstrates that TLAF, a relatively simple technique, w...
In the present work, CH and NO profiles are determined using laser-induced fluorescence (LIF) measurements in eight low-pressure laminar flames of CH/O/N containing various amounts of methyl ethyl ketone or ethyl acetate with respect to the equivalence ratio. Relative CH LIF signals are calibrated using cavity ring-down spectroscopy (CRDS), while N...
Temperature and mole fraction profiles have been measured in laminar stoichiometric premixed CH4/O2/N2 and CH4/1.5%C6H5CH3/O2/N2 flames at low pressure (0.0519 bar) by using thermocouple, molecular beam/mass spectrometry (MB/MS), and gas chromatography/mass spectrometry (GC/MS) techniques. The present study completes our previous work performed on...
An experimental study of the detonation in gaseous nitromethane (NM) and nitromethane-oxygen mixtures has exhibited unambiguously the existence of a double cellular structure in the range of equivalence ratio
f\phi
from 1.3 to 1.75 (NM). Calculations of the reaction zone of the detonation in the same range of equivalence ratio, using a detailed ch...
Ignition delay times have been measured behind reflected shock waves using infrared and ultraviolet emission spectroscopies in the wide ranges of temperature (1485-1900 K), pressure (0.3-1.3 MPa), equivalence ratio (0.5-2) and dilution with argon (95-99%). For a mixture composed of several alkanes, it has been shown that the ignition delay can be e...
The present work reports experimental results on the determination of laminar flame velocities of hydrogen–air mixtures diluted or not by a mixture containing helium and carbon dioxide. The experimental setup consists of a spherical bomb coupled to a schlieren system and a high speed camera. The Markstein numbers are determined for all the investig...
The present work reports experimental results on the determination of laminar flame velocities of hydrogen– air - diluent mixtures initially at 100 kPa and for 2 different initial temperatures 298 and 353 K. The diluent was water vapor or a mixture containing helium and carbon dioxide. The data obtained in this study are compared with the literatur...
Ignition delays for low alkanes/oxygen mixtures highly diluted with argon were measured behind a reflected shock wave using
ultraviolet emission spectrometry in wide ranges of temperature (1200–2700 K), pressure (0.1–1.8 MPa), equivalence ratio (0.5–2)
and dilution (89–99%). For each alkane (methane, ethane and propane), a correlation between ignit...
Calculations of the reaction zone of the detonation of gaseous nitromethane, either pure or diluted with oxygen, in the range of equivalence ratio Φ between 0.1 and 1.75, show that for 1.75⩾Φ⩾1.3 the chemical energy is released in two main successive reaction steps characterized by very different induction times. These results corroborate the exper...