Raman-LIF measurements of temperature, major species, OH, and NO in a methane-air bunsen flame

Nguyen, Quang‐Viet; Dibble, Robert W.; Carter, C.D.; Fiechtner, Gregory J.

doi:10.1016/0010-2180(96)00226-x

Cited by 118 publications

(47 citation statements)

References 28 publications

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“…Spatial resolution of measurements has been estimated to be approximately 750 μm [16,23,24]. A quick estimation of the chemical length scale tells us that it is of the same order of magnitude as the probe resolution:…”

Section: A Priori Validation Of Fgm Databasesmentioning

confidence: 99%

A Priori Testing of Flamelet Generated Manifolds for Turbulent Partially Premixed Methane/Air Flames

Ramaekers

Oijen

Goey

2009

Flow Turbulence Combust

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To reduce high computational cost associated with simulations of reacting flows chemistry tabulation methods like the Flamelet Generated Manifold (FGM) method are commonly used. However, H 2 , CO and OH predictions in RANS and LES simulations using the FGM (or a similar) method usually show a substantial deviation from measurements. The goal of this study is to assess the accuracy of low-dimensional FGM databases for the prediction of these species in turbulent, partially-premixed reacting flows. It will be examined to what extent turbulent, partially-premixed jet flames can be described by FGM databases based on premixed or counterflow diffusion flamelets and to what extent the chosen molecular transport model for the flamelet influences the accuracy of species mass fraction predictions in CFD-simulations. For LES and RANS applications a model that accounts for subgrid fluctuations has to be added introducing additional errors in numerical results. A priori analysis of FGM databases enables the exclusion of numerical errors (scheme accuracy, convergence) that occur in CFD simulations as well as the exclusion of errors originating from subgrid modeling assumptions in LES and RANS. Four different FGM databases are compared for H 2 O, H 2 , CO, CO 2 and OH predictions in Sandia Flames C to F. Species mass fractions will be compared to measurements directly and conditioned on mixture fraction. Special attention is paid to the representation of experimentally observed differential diffusion effects by FGM databases.

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Section: A Priori Validation Of Fgm Databasesmentioning

confidence: 99%

A Priori Testing of Flamelet Generated Manifolds for Turbulent Partially Premixed Methane/Air Flames

Ramaekers

Oijen

Goey

2009

Flow Turbulence Combust

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“…[1][2][3][4][5] The line-imaging Raman/Rayleigh scattering instrument at Sandia National Laboratories (SNL) provides instantaneous measurements of temperature and major species concentrations (N 2 , O 2 , CO 2 , CO, H 2 O, H 2 and CH 4 ) in flames, over a 6 mm probe line, with a spatial resolution of ~100 microns. The instrument is routinely applied to measurements in laboratory-scale flames that are specifically designed to advance the understanding of the turbulence-chemistry interaction, and to provide validation databases for computational models.…”

Section: Introductionmentioning

confidence: 99%

“…A weaker Raman signal from methane is located in the 1200-1900 cm -1 range resulting from a CH 2 bending mode, causing a crosstalk onto the CO 2 (1133-1489 cm -1 ) and O 2 (1489-1662 cm -1 ) Raman channels. The methane Raman signals in the CO 2 and O 2 channels are sensitive to the bowing effect, with ~10% changes in the integrated Raman scattering intensity between the center and the edge of the 6 mm probe line. Since the methane crosstalk is an order of magnitude weaker than the CO 2 and O 2 Raman signal, the error in the concentration caused by neglecting the bowing effect is less than 1% for typical methane-air flame compositions.…”

Section: Introductionmentioning

confidence: 99%

Raman spectra of methane, ethylene, ethane, dimethyl ether, formaldehyde and propane for combustion applications

Magnotti

Varghese

et al. 2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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Spontaneous Raman scattering measurements of temperature and major species concentration in hydrocarbon-air flames require detailed knowledge of the Raman spectra of the hydrocarbons present when fuels more complex than methane are used. Although hydrocarbon spectra have been extensively studied at room temperature, there are no data available at higher temperatures. Quantum mechanical calculations, when available are not sufficiently accurate for combustion applications. This work presents experimental measurements of spontaneous Stokes-Raman scattering spectra of methane, ethylene, ethane, dimethyl ether, formaldehyde and propane in the temperature range 300-860 K. Raman spectra from heated hydrocarbons jets have been collected with a higher resolution than is generally employed for Raman measurements in combustion applications. A set of synthetic spectra have been generated for each hydrocarbon, providing the basis for extrapolation to higher temperatures. The spectra provided here will enable simultaneous measurements of multiple hydrocarbons in flames. This capability will greatly extend the range of applicability of Raman measurements in combustion applications. In addition, the experimental spectra provide a validation dataset for quantum mechanical models.

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“…In this context, the available methods include laser-induced fluorescence (LIF) using excitation at 193 or 226 nm; [8][9][10][11][12][13] vibrational and pure-rotational coherent anti-Stokes Raman scattering (CARS) spectroscopy; [14][15][16][17] and spontaneous Raman scattering. [18][19][20][21][22] Assuming thermal equilibrium, it is possible to determine the population of excited oxygen from a combined measurement of the ground state population and the temperature. However, this assumption can hardly be justified in the vicinity of the reaction zone in a flame where the complex chemistry produces nonequilibrium species such as radicals in electronically excited states.…”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Fluorescence Detection of Hot Molecular Oxygen in Flames Using an Alexandrite Laser

et al. 2014

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The use of an alexandrite laser for laser-induced fluorescence (LIF) spectroscopy and imaging of molecular oxygen in thermally excited vibrational states is demonstrated. The laser radiation after the third harmonic generation was used to excite the B-X (0-7) band at 257 nm in the Schumann-Runge system of oxygen. LIF emission was detected between 270 and 380 nm, revealing distinct bands of the transitions from B(0) to highly excited vibrational states in the electronic ground state, X (v . 7). At higher spectral resolution, these bands reveal the common P-and R-branch line splitting. Eventually, the proposed LIF approach was used for single-shot imaging of the two-dimensional distribution of hot oxygen molecules in flames.

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Raman-LIF measurements of temperature, major species, OH, and NO in a methane-air bunsen flame

Cited by 118 publications

References 28 publications

A Priori Testing of Flamelet Generated Manifolds for Turbulent Partially Premixed Methane/Air Flames

A Priori Testing of Flamelet Generated Manifolds for Turbulent Partially Premixed Methane/Air Flames

Raman spectra of methane, ethylene, ethane, dimethyl ether, formaldehyde and propane for combustion applications

Laser-Induced Fluorescence Detection of Hot Molecular Oxygen in Flames Using an Alexandrite Laser

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