Two-dimensional imaging of OH in a lean burning high pressure combustor

Locke, Randy J.; Hicks, Yolanda R.; Anderson, Robert C.; Ockunzzi, Kelly A.; North, G. L.

doi:10.2514/6.1995-173

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Particularly challenging, then, will be the advance of PLEF-imaging of NO to the fuel-lean, high-pressure (>10atm), and high-temperature (-2000 K) environments of gas turbines combustors [11] or their experimental analogues [12], conditions for which an indiscriminate choice of excitation wavelength might severely restrict the measurement's sensitivity to NO concentration.…”

Section: Introductionmentioning

confidence: 99%

LIF spectroscopy of NO and O2 in high-pressure flames

Rosa

Klavuhn

Hanson

1996

34th Aerospace Sciences Meeting and Exhibit

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AIAA 34th Aerospace Sciences Meeting and Exhibit, Reno, NV Jan 15-18, 1996We report new models of absorption, excitation, and fluorescence spectra for joint excitations of the A-X (0,0) transition band of NO and the B-X bands of O2. Supporting measurements obtained from the burned regions of flames operated at pressures from 1 to 10 atm are also presented. As developed through these models, a strategy appropriate for imaging planar laser-induced fluorescence is proposed that, for lean combustion environments, should afford sensitive measurements of NO concentration through the use of a single excitation wavelength despite the photolytic interference from O2 that intensifies with increasing pressure and temperature. (Author) AbstractWe report new models of absorption, excitation, and fluorescence spectra for joint excitations of the A*-X (0,0) band of NO and the B<-X bands of O 2 . Supporting measurements obtained from the burned regions of flames operated at pressures from 1 to 10 atm are also presented. As developed through these models, a strategy appropriate for imaging planar laser-induced fluorescence is proposed that, for lean combustion environments, should afford sensitive measurements of NO concentration through the use of a single excitation wavelength despite the photolytic interference from O 2 that intensifies with increasing pressure and temperature.

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Section: Introductionmentioning

confidence: 99%

LIF spectroscopy of NO and O2 in high-pressure flames

Rosa

Klavuhn

Hanson

1996

34th Aerospace Sciences Meeting and Exhibit

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“…The size of the combustion systems under investigation range from a laboratory scale, mainly employing gaseous fuel and simple burner setups (Cheng et al (1992), Schefer et al (1990)), over model combustors e.g. with a supersonic flow (McMillin et al (1994), Honig et al (1996)), to industrial scale, characterized by using liquid fuel and complex burner geometry, occasionally operated under elevated pressure conditions (Versluis et al (1992), Arnold et al (1993), Koch et al (1993), Honig et al (1994), Locke et al (1995), Allen et al (1995), Upschulte et al (1996)).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Single-Shot LIF-Imaging of OH and UHC in a Prevaporized, Partially Premixed, Swirl-Stabilized n-Heptane Flame

Lachner

Theisen

Fink

et al. 1998

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

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The prevaporized, partially premixed, swirl-stabilized n-heptane flame in an atmospheric pressure combustor is investigated using a tuneable KrF excimer laser. Flashing the flame with a laser sheet tuned to the P2(8) line of OH (hydroxyl radical), single-shot images of the laser-induced signals are taken simultaneously with two ICCD-cameras aligned to the same measuring volume. One camera detects mainly the laser-induced fluorescence (LIF) from the 3→2 band of the OH plus signals from UHC (unburned hydrocarbons). Only broad-band emission from UHC is imaged onto the other camera. Comparing the two images, signals stemming from OH and UHC, respectively, can be distinguished. Pictures, taken in various planes along the main flow direction, reveal highly turbulent structures in the flame. High fluorescence signals from OH can obviously be found both in filament-like flame fronts lying between fresh combustible mixtures and hot combustion products as well as in broadened reaction regions.

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“…23 The 10 Hz, 532 nm output from a Continuum model ND-81C, Nd:YAG laser pumps a ND 60 dye laser, the output of which is doubled by a UVX ultra-violet wavelength extension system. The resulting 281 nm output, maintained at approximately 20 mJ for the experiments described herein, is delivered through 90 mm acrylic tubes to the test cell by a series of remotely controlled high damage threshold mirrors.…”

Section: Hardwarementioning

confidence: 99%