Temperature measurements in a rapid compression machine using anisole planar laser-induced fluorescence

Tran, Khanh-Hung; Guibert, Philippe; Morin, Céline; Bonnety, Jérôme; Pounkin, Stoyan; Legros, Guillaume

doi:10.1016/j.combustflame.2015.07.033

Cited by 27 publications

(10 citation statements)

References 26 publications

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“…At 403 K, the fluorescence signal is 49% of the room-temperature value. This is qualitatively consistent with literature results from gaseous anisole in nitrogen or carbon dioxide [19,20]. For liquid anisole dissolved in isooctane Geiler [10] measured at 403 K a signal decrease to 50%, and in iso-dodecane Mueller et al [21] measured at the same temperature a decrease to 28%.…”

Section: Fluorescence Properties Of Anisole In Watersupporting

confidence: 90%

Imaging of water droplet clusters on glass with simultaneous laser-induced fluorescence and near-infrared absorption

Mirschinka

Geiler

Kaiser

et al. 2021

ICLASS

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Water films and droplets on surfaces are important in the design of various processes. In the present work, two complementary non-invasive imaging techniques, laser-induced fluorescence (LIF) and near-infrared absorption (NIRA), were used simultaneously to quantify the deposited water mass in a simple spray-onto-plate experiment. LIF was applied in epiillumination with optical access from only one direction, but it requires the addition of a marker substance to the non-fluorescing water. Here, anisole (methoxybenzene) was used for this purpose. The present implementation of NIRA is based on the intensity ratio of light transmitted through the sample at two wavelengths, 1450 and 600 nm. Since water itself is the IR absorber, a tracer is not required. In a first step, in a thin-film cuvette the influence of temperature and film thickness on the measurement accuracy was investigated for both techniques. In a second set of experiments, water was sprayed onto a hot or cold quartz glass plate and simultaneously imaged with both techniques. From the measurements, advantages and weaknesses of both approaches were identified.

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Section: Fluorescence Properties Of Anisole In Watersupporting

confidence: 90%

Imaging of water droplet clusters on glass with simultaneous laser-induced fluorescence and near-infrared absorption

Mirschinka

Geiler

Kaiser

et al. 2021

ICLASS

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“…Aerodynamics and temperature inside flat piston RCMs have been extensively studied with modeling [3] [5] and by experimentation [6] [7] [8] [9] [10] [11] [12] [13]. A few papers have experimentally studied the autoignition/turbulence interactions in RCMs.…”

Section: Introductionmentioning

confidence: 99%

Effects of low temperature heat release on the aerodynamics of a flat piston rapid compression machine: Impact on velocity and temperature fields

Houidi

Sotton

Bellenoue

et al. 2019

Proceedings of the Combustion Institute

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The study of auto-ignition under temperature stratification is of great interest. Indeed, further understanding of the thermo-kinetic interactions and its influence on the combustion propagation regime is needed. In a previous work [1], experiments in a flat piston Rapid Compression Machine (RCM) demonstrated that the apparent propagation of reaction fronts is highly influenced by the typical temperature stratification observed at inert conditions. Nevertheless, the influence of low temperature heat release (LTHR) on the internal aerodynamics and temperature of the RCM is not well understood. In the present study, we first address the LTHR-flow interaction then address the LTHR-temperature interaction. We performed 2D-PIV experiments at 10 kHz for inert and reactive lean isooctane mixtures. We averaged spatially the acceleration to present the time evolution during the cool flame period. We found that the normalized acceleration has a decreasing trend in both inert and reactive tests. No significant effect of the cool flame was observed on the trend. We performed temperature measurements using thin wire (7.6 µm) type K thermocouples at inert and reactive n-hexane mixtures (same test conditions of fig. 7 in [1]). The temperature evolution of the hot (adiabatically compressed) and the colder gases were recorded when cool flame occurs. The corrected gas temperature showed good agreement with the theoretical adiabatic core temperature as well as previous measurements with toluene LIF. In the tested case, we found that the cool flame induces an equal temperature rise of approximately 110 K in both the adiabatically compressed and the colder vortex gases. These results confirm quantitatively that LTHR does not significantly affect the mixing of the

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“…These diagnostics are based on gas chromatography (GC), laser-based absorption, emission, and fluorescence spectroscopy. 50,51 Recently, efforts to combine RCMs with universal mass spectrometric detection have been described. 52 Jet-stirred Reactors, Flow Reactors, and Laminar Flames.…”

Section: ■ Experimental and Modeling Methodsmentioning

confidence: 99%

“…Advanced diagnostics methods have been developed for allowing the determination of quantitative time-dependent species concentration profiles to provide chemically detailed insights. These diagnostics are based on gas chromatography (GC), laser-based absorption, emission, and fluorescence spectroscopy. , Recently, efforts to combine RCMs with universal mass spectrometric detection have been described …”

Section: Experimental and Modeling Methodsmentioning

confidence: 99%

Review of the Influence of Oxygenated Additives on the Combustion Chemistry of Hydrocarbons

et al. 2021

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This review summarizes the chemical impact of oxygenated additives on the combustion chemistry of hydrocarbons. Experimental studies in shock tubes, rapid compression machines, jet-stirred reactors, flow reactors, and premixed flames are summarized for additions of ethers, alcohols, esters, and other oxygenates to hydrocarbon fuels. Special emphasis is on the ignition behavior at low and high temperatures and on how molecule-specific intermediate chemistry impacts pollutant emissions by the addition of oxygenated components to hydrocarbon fuels. The literature work indicates that at high temperatures, i.e., in flames, the combustion chemistry of the oxygenate/hydrocarbon can be accurately modeled by merging the individual's submechanisms, excluding cross reactions. The observed trend in the intermediate species pool is largely due to a replacement effect, which describes a linear dependence of the intermediate concentration on the mixture composition. At low-temperatures, the chemistry is slightly more complex because of the fuel-specific reactivity in this temperature range. It was shown that unreactive fuels can undergo low-temperature oxidation processes when a highly reactive fuel component is present. As such, the sensitivities of specific reactions on ignition delay times varies.

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Temperature measurements in a rapid compression machine using anisole planar laser-induced fluorescence

Cited by 27 publications

References 26 publications

Imaging of water droplet clusters on glass with simultaneous laser-induced fluorescence and near-infrared absorption

Imaging of water droplet clusters on glass with simultaneous laser-induced fluorescence and near-infrared absorption

Effects of low temperature heat release on the aerodynamics of a flat piston rapid compression machine: Impact on velocity and temperature fields

Review of the Influence of Oxygenated Additives on the Combustion Chemistry of Hydrocarbons

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