Shock-tube study of pressure broadening of the A2∑+ - X2Π (0,0) band of OH by Ar and N2

Rea, Edward C.; Chang, Albert Y.; Hanson, Ronald K.

doi:10.1016/0022-4073(87)90015-x

Cited by 101 publications

(23 citation statements)

References 13 publications

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“…The absorption coefficient, k , is calculated using the line parameters from the recent work of Gillis et al [18], consistent with the study of Luque et al [19]. Collisionbroadening coefficients from the work of Rea et al [20] and collision-shift coefficients from that of Herbon and Hanson [16] were used to calculate line shape parameters. For all experiments, the laser was tuned near the peak of the well-characterized R 1 (5) line of the OH A 2 + -X 2 (0,0) band.…”

Section: Experimental Methodsmentioning

confidence: 99%

OH concentration time histories in n‐alkane oxidation

Davidson

Herbon

Horning

et al. 2001

Int J of Chemical Kinetics

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OH radical concentration time histories were measured behind reflected shocks in the oxidation of four n-alkanes: propane, n-butane, n-heptane, and n-decane. Initial reflected shock conditions of these measurements were 1357-1784 K, 2.02-3.80 atm, with fuel concentrations of 300-2000 ppm, and equivalence ratios from 0.8 to 1.2. OH concentrations were measured using narrow-linewidth ring-dye laser absorption of the R 1 (5) line of the A-X (0,0) transition at 306.5 nm. These concentration time-history measurements were compared to the modeled predictions of eight large n-alkane oxidation mechanisms currently available in the literature and the kinetic implications of these measurements are discussed. These data, in conjunction with recent measurements of n-alkane ignition times and ethylene yields in n-alkane pyrolysis experiments, also performed in this laboratory, provide a unique database of species concentration time histories for n-alkane mechanism validation.

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Section: Experimental Methodsmentioning

confidence: 99%

OH concentration time histories in n‐alkane oxidation

Davidson

Herbon

Horning

et al. 2001

Int J of Chemical Kinetics

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“…Line ratios were determined by first extracting the line intensities of each rovibronic line at various temperatures. The contribution to the line shape from collisional broadening was based on measurements performed by Rea et al [23]. The simulated fluorescence intensities of the desired line pairs were then compared with the experimentally measured ratio.…”

Section: A Line-peak-ratio Simulationsmentioning

confidence: 99%

Comparison of line-peak and line-scanning excitation in two-color laser-induced-fluorescence thermometry of OH

Kostka¹,

Roy²,

Lakusta³

et al. 2009

Appl. Opt.

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Two-line laser-induced-fluorescence (LIF) thermometry is commonly employed to generate instantaneous planar maps of temperature in unsteady flames. The use of line scanning to extract the ratio of integrated intensities is less common because it precludes instantaneous measurements. Recent advances in the energy output of high-speed, ultraviolet, optical parameter oscillators have made possible the rapid scanning of molecular rovibrational transitions and, hence, the potential to extract information on gas-phase temperatures. In the current study, two-line OH LIF thermometry is performed in a wellcalibrated reacting flow for the purpose of comparing the relative accuracy of various line-pair selections from the literature and quantifying the differences between peak-intensity and spectrally integrated line ratios. Investigated are the effects of collisional quenching, laser absorption, and the integration width for partial scanning of closely spaced lines on the measured temperatures. Data from excitation scans are compared with theoretical line shapes, and experimentally derived temperatures are compared with numerical predictions that were previously validated using coherent anti-Stokes-Raman scattering. Ratios of four pairs of transitions in the A 2 Σ+←X 2 Π (1,0) band of OH are collected in an atmospheric-pressure, near-adiabatic hydrogen-air flame over a wide range of equivalence ratios-from 0.4 to 1.4. It is observed that measured temperatures based on the ratio of Q 1( 14)/Q 1( 5) transition lines result in the best accuracy and that line scanning improves the measurement accuracy by as much as threefold at lowequivalence-ratio, low-temperature conditions. These results provide a comprehensive analysis of the procedures required to ensure accurate two-line LIF measurements in reacting flows over a wide range of conditions. Keywords coherent scattering, fluid structure interaction, fluorescene, gas absorption, laser produced plasmas, microlenses, scanning, temperature sensors, coherent anti-Stokes, collisional quenching, comprehensive analysis, energy output, equivalence ratios, gasphase, laser absorption, laser induced fluorescence, LIF thermometry, low temperatures, measurement accuracy, numerical predictions RightsThis paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: https://www.osapublishing.org/ ao/abstract.cfm?uri=ao-48-32-6332. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. Two-line laser-induced-fluorescence (LIF) thermometry is commonly employed to generate instantaneous planar maps of temperature in unsteady flames. The use of line scanning to extract the ratio of integrated intensities is less common because it precludes instantaneous measurements. Recent advances in the energy output of high-speed, ultraviolet, optical parameter oscillators have made p...

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“…The temperature dependence of the collisional broadening coefficient was described using the expression of Rea et al [47].…”

Section: Laser Induced Fluorescence Modelmentioning

confidence: 99%

“…The 2γ and n parameters were taken from available data [44,47,48,49,50] for the OH radical (0,0) band because of the lack of data for the (1,0) band. The rotational level dependence of the collisional broadening coefficient studied by Kessler et al…”

Section: Laser Induced Fluorescence Modelmentioning

confidence: 99%