Measurements of OH mole fraction and temperature up to 20 kHz by using a diode-laser-based UV absorption sensor

Meyer, Terrence R.; Roy, Sukesh; Anderson, Thomas N.; Miller, Joseph D.; Katta, Viswanath R.; Lucht, Robert P.; Gord, James R.

doi:10.1364/ao.44.006729

Cited by 58 publications

(13 citation statements)

References 27 publications

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“…1, which is similar to that used by Woolridge et al [17], Kulatilaka et al [18], Hancock et al [7], and Meyer et al [19]. The burner consists of a 24 mm square, Hastalloy honeycomb that supports hypodermic needles within a quarter of its cells.…”

Section: Methodsmentioning

confidence: 91%

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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Section: Methodsmentioning

confidence: 91%

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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“…Note that number densities ∼10 10 cm −3 of H, OH, and O radicals are being produced in an area of the preheat zone with a temperature of approximately 800 K through the dissociative recombination of flame positive chemi-ionization-produced ions at the burner head, which would far exceed the direct combustion-kinetics-driven production of OH and H [23,24] in this range of gas temperature. We propose that the radicals act to increase the concentrations of Table 1 Number densities of chemi-ionization-derived positive flame ions and electric-field-induced dissociative recombination produced radicals at the base of a premixed propane/air flame for the different current values on the I -V curve of Fig.…”

Section: Dissociative Recombination Derived Radical Number Density Esmentioning

confidence: 99%

Electrical control of the thermodiffusive instability in premixed propane–air flames

Wisman

Marcum

Ganguly

2007

Combustion and Flame

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This work focuses upon the effects of DC electric fields on the stability of downward propagating atmospheric pressure premixed propane-air flames under experimental conditions that provide close coupling of the electric field to the flame. With the appropriate electrode geometry, modest applied voltages are shown to drive a stable conical flame first into a wrinkled-laminar flamelet geometry, and then further toward either a highly unstable distributed flamelet regime or a collective oscillation of the flame front. Applied potentials up through +5 kV over a 40-mm gap encompassing the flame front have been used to force the above transition sequence in flames with equivalence ratios between 0.8 and 1.3 and flow velocities up to 1.7 m/s. Experiments are reported that characterize the field-induced changes in the geometry of the reaction zone and the structure of the resulting unstable flame. The former is quantified by combustion intensity enhancement estimates derived from high-speed two-dimensional direct and spectroscopic imaging of chemiluminescence signals. The flame fluid mechanical response to the applied field, brought about by forcing positive flame ions counter to the flow, drives the effective flame Lewis number to values suitable for the onset of the thermodiffusive instability, even near stoichiometric conditions. Possible field-driven flame ion recombination chemistry that would produce light reactants near the burner head and precipitate the onset of the thermodiffusive instability is proposed. Electrical measurements are also reported that establish that minimal electrical power input is required to produce the observed flame instabilities. Current continuity-based calculations allow estimates of the level of deficient light reactant necessary to cause the flame to become unstable. This applied-electric-field-induced modification of the thermodiffusive effect could serve as a potentially attractive means of controlling flame fluid-mechanical characteristics and validating combustion instability models over a wide range of equivalence ratios. Published by Elsevier Inc. on behalf of The Combustion Institute.

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“…This section gives a brief overview on high-speed PLIF and PIV in combustion related applications and summarizes combined PIV/PLIF applications at high data acquisition rates. PLIF at high sampling rates is an emerging technique and complements single or two-point techniques, as developed by [41][42][43][44]. The pioneering work by Kaminski et al [15] provided valuable insights into the dynamics of turbulence-chemistry interaction processes.…”

Section: Literature Review Of Planar High-speed Plif and Piv In Combumentioning

confidence: 99%

New Perspectives on Turbulent Combustion: Multi-Parameter High-Speed Planar Laser Diagnostics

Böhm

Heeger

Gordon

et al. 2010

Flow Turbulence Combust

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Over the past three decades laser combustion diagnostics have guided an improved understanding of turbulent combustion processes. Until recently, this was based on statistically independent sampling using sampling rates much slower than typical integral time-scales of turbulent flames. Recent developments in laser and camera technology enabled an increase in sampling rates by more than three orders of magnitudes. Using these new instruments for particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) at high sampling rates (high-speed diagnostics) allowed the resolution of integral time-scales of turbulent flames. This statistically dependent sampling is increasingly used to temporally track transients in turbulent combustion, such as flame extinction, ignition, flashback and cycle-tocycle variations in IC engines. The simultaneous application of flow and scalar field measurements makes insights into these transients possible that were not when using statistically independent sampling with low data acquisition rates. Conditioning on distinct flame features with high-speed diagnostics enables the inclusion of time as an additional dimension. This paper reviews the emerging field of multi-parameter, high-speed, planar laser diagnostics in combustion applications. The benefit of high data acquisition rates in turbulent combustion applications is discussed in detail as well as requirements and constraints imposed by the time-scales of the investigated phenomenon are addressed. Recent developments in laser and detector hardware

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Measurements of OH mole fraction and temperature up to 20 kHz by using a diode-laser-based UV absorption sensor

Cited by 58 publications

References 27 publications

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

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

Electrical control of the thermodiffusive instability in premixed propane–air flames

New Perspectives on Turbulent Combustion: Multi-Parameter High-Speed Planar Laser Diagnostics

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