Simultaneous phosphor and CARS thermometry at the wall–gas interface within a combustor

Brübach, J.; Hage, Michael; Janicka, J.; Dreizler, Andreas

doi:10.1016/j.proci.2008.05.017

Cited by 28 publications

(5 citation statements)

References 18 publications

(20 reference statements)

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“…The method is rather insensitive against the properties of the surface and robust against interference from scattered light, chemiluminescence or soot radiation. In general, the variable lifetime of the laser-induced luminescence is employed for thermometry purposes [6][7][8][9][10][11][12][13][14]. Furthermore, some phosphor materials exhibit temperaturesensitive emission spectra, which allows us to do two-line thermometry [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Gd₃Ga₅O₁₂:Cr—a phosphor for two-dimensional thermometry in internal combustion engines

Fuhrmann¹,

Kissel²,

Dreizler³

et al. 2011

Meas. Sci. Technol.

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The lifetime of thermographic phosphors needs to be short enough to resolve the temperature time scales and long enough to be properly resolved by the respective detector. Up until now, there has not been a thermographic phosphor that exhibits an adequate temperature lifetime characteristic for two-dimensional thermometry inside internal combustion engines using high speed cameras. Hence, this study suggests the material Gd 3 Ga 5 O 12 :Cr for this purpose. The emission spectra and the temperature lifetime characteristics were determined and the lifetime is shown to be independent of the composition and the absolute pressure of the surrounding gas phase.

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Section: Introductionmentioning

confidence: 99%

Gd₃Ga₅O₁₂:Cr—a phosphor for two-dimensional thermometry in internal combustion engines

Fuhrmann¹,

Kissel²,

Dreizler³

et al. 2011

Meas. Sci. Technol.

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“…Nevertheless it is important to ensure high accuracy and precision of the temperature measurement to minimize the CO concentration uncertainty. Therefore we used CARS (N 2 ro-vibrational coherent anti-Stokes Raman spectroscopy) in the planar BOXCARS configuration, which requires that the laser beam of a frequency doubled Nd:YAG laser (532 nm) and a modeless broadband dye laser (607 nm) are phase-matched within the surface [34]. With that technique we determined absolute, spatially resolved (x=65 µm) temperature profiles perpendicular to the burner surface along the vertical line through the stagnation point with relative temperature uncertainties of only 1.6 to 2 %.…”

Section: In-flame Tdlas Spectrometer Setupmentioning

confidence: 99%

Absolute, spatially resolved, in situ CO profiles in atmospheric laminar counter-flow diffusion flames using 2.3 μm TDLAS

et al. 2012

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We developed a new, spatially traversing, direct tunable diode laser absorption spectrometer (TDLAS) for quantitative, calibration free and spatially resolved in situ measurements of CO profiles in atmospheric, laminar, non-premixed CH 4 /air model flames stabilized at a Tsuji counter flow burner.The spectrometer employed a carefully characterized, room temperature distributed feedback diode laser to detect the R20 line of CO near 2313 nm (4324.4 cm -1 ), which allows to minimize spectral CH 4 interference and detect CO even in very fuel rich zones of the flame. The burner head was traversed through the 0.5 mm diameter laser beam in order to derive spatially resolved CO profiles in the only 60 mm wide CH 4 /air flame. Our multiple Voigt line Levenberg-Marquardt fitting algorithm and the use of highly efficient optical disturbance correction algorithms for treating transmission and background emission fluctuations as well as careful fringe interference suppression permitted to achieve a fractional optical resolution of up to 2.4x10 -4 OD (1) in the flame (T up to 1965 K). Highly accurate, spatially resolved, absolute gas temperature profiles, needed to compute mole fraction and correct for spectroscopic temperature dependencies, were determined with a spatial resolution of 65 µm using ro-vibrational N 2 -CARS (Coherent anti-Stokes Raman spectroscopy ). With this setup we achieved temperature dependent CO detection limits at the R20 line of 250 to 2000 ppmv at peak CO concentrations of up to 4 Vol.%. This permitted local CO detection with signal to noise ratios of more than 77. The CO TDLAS spectrometer was then used to determine absolute, spatially resolved in situ CO concentrations in the Tsuji flame, investigate the strain dependence of the CO Profiles and favorably compare the results to a new flame chemistry model.

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“…The direct injection engine had an 84 mm bore and a stroke of 90 mm. This results in an engine displacement of 500 cm 3 and a compression ratio of 10:1. The intake valves opened at −350 CAD (crank angle degree) for a duration of 190 CAD, whilst the exhaust valves opened at 190 CAD after top dead centre and closed at −320 CAD.…”

Section: Optically Accessible Internal Combustion Enginementioning

confidence: 99%

“…The emitted, time-resolved luminescence decay is a function of surface temperature and can therefore be employed for thermometry purposes [2][3][4]. A second popular approach relies on the temperature dependent ratio of two spectrally separated emission peaks of certain phosphor materials [5,6].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional cycle-resolved exhaust valve temperature measurements in an optically accessible internal combustion engine using thermographic phosphors

et al. 2011

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Phosphor thermometry was employed to measure the temperature distribution of the exhaust valves in an optically accessible direct injection internal combustion engine. A CMOS high-speed camera was used to twodimensionally resolve the temperature dependent luminescence decay of the phosphor Gd 3 Ga 5 O 12 :Cr. Measurements were performed under motored and fired conditions for several degrees crank angle to determine the temperature distributions within cycles. Additionally, several binders have been tested in terms of survivability and signal strength to guarantee ideal phosphor coating.

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Simultaneous phosphor and CARS thermometry at the wall–gas interface within a combustor

Cited by 28 publications

References 18 publications

Gd₃Ga₅O₁₂:Cr—a phosphor for two-dimensional thermometry in internal combustion engines

Gd₃Ga₅O₁₂:Cr—a phosphor for two-dimensional thermometry in internal combustion engines

Absolute, spatially resolved, in situ CO profiles in atmospheric laminar counter-flow diffusion flames using 2.3 μm TDLAS

Two-dimensional cycle-resolved exhaust valve temperature measurements in an optically accessible internal combustion engine using thermographic phosphors

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Simultaneous phosphor and CARS thermometry at the wall–gas interface within a combustor

Cited by 28 publications

References 18 publications

Gd3Ga5O12:Cr—a phosphor for two-dimensional thermometry in internal combustion engines

Gd3Ga5O12:Cr—a phosphor for two-dimensional thermometry in internal combustion engines

Absolute, spatially resolved, in situ CO profiles in atmospheric laminar counter-flow diffusion flames using 2.3 μm TDLAS

Two-dimensional cycle-resolved exhaust valve temperature measurements in an optically accessible internal combustion engine using thermographic phosphors

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Gd₃Ga₅O₁₂:Cr—a phosphor for two-dimensional thermometry in internal combustion engines

Gd₃Ga₅O₁₂:Cr—a phosphor for two-dimensional thermometry in internal combustion engines