Refractive indices of soot particles deduced from in-situ laser light scattering measurements

Charalampopoulos, Tryfon T.; Felske, James D.

doi:10.1016/0010-2180(87)90005-8

Cited by 58 publications

(32 citation statements)

References 19 publications

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“…Although the flames treated in Ref. 41 were different from those that we consider here, we can use their evaluated values to estimate the uncertainty in particle size by choosing one value of the complex refractive index. When the factor ͓E͑m͒͒͑͞F͑m͔͒ 1͞3 in Eq.…”

Section: Discussionmentioning

confidence: 99%

“…The variations of the refractive index within a premixed methane-oxygen flat flame were investigated by Charalampopoulos and Felske. 41 They combined classical lightscattering with dynamic light-scattering measurements and evaluated the refractive index from these measurements. Their results showed, for increasing heights in the flame, an increase in the real part of the complex refractive index from 1.4 to 1.8 and in the imaginary part from 0.4 to 0.8.…”

Section: Discussionmentioning

confidence: 99%

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Laser-induced incandescence for soot particle size measurements in premixed flat flames

2000

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Measurements of soot properties by means of laser-induced incandescence ͑LII͒ and combined scatteringextinction were performed in well-characterized premixed ethylene-air flames. In particular, the possibility of using LII as a tool for quantitative particle sizing was investigated. Particle sizes were evaluated from the temporal decay of the LII signal combined with heat balance modeling of laser-heated particles, and these sizes were compared with the particle sizes deduced from scattering-extinction measurements based on isotropic sphere theory. The correspondence was good early in the sootformation process but less good at later stages, possibly because aggregation to clusters began to occur. A critical analysis has been made of how uncertainties in different parameters, both experimental and in the model, affect the evaluated particle sizes for LII. A sensitivity analysis of the LII model identified the ambient-flame temperature as a major source of uncertainty in the evaluated particle size, a conclusion that was supported by an analysis based on temporal LII profiles.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Laser-induced incandescence for soot particle size measurements in premixed flat flames

2000

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“…After passing the flame, it was coupled into a second fiber which was then mounted onto a second temperature stabilized photodiode. For the calculation of soot volume fractions with Lambert-Beer's law we used an index of refraction of l.6(M).59i [25] for both the extinction (1064 nm) and Lll detection wavelength (450 nm). The correlated LII image of the flame was corrected for self-absorption by an 'onion peeling' algorithm [26] as implemented into our data analysis routines [27].…”

Section: Oh Chemiluminescence and Lumentioning

confidence: 99%

Experimental Analysis of Soot Formation and Oxidation in a Gas Turbine Model Combustor Using Laser Diagnostics

Geigle

Zerbs

Köhler

et al. 2011

Journal of Engineering for Gas Turbines and Power

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Sooting ethylene I air flames were investigated experimentally in a dual swirl gas turbine model combustor with good optical access at atmospheric pressure. The goals of the investigations were a detailed characterization of the soot formation and oxidation processes under gas turbine relevant conditions and the establishment of a data base for the validation of numerical combustion simulations. The flow field was measured by stereoscopic particle image velocimetry, the soot volume fractions by laser-induced incandescence, the heat release by OH chemiluminescence imaging and the temperatures by coherent anti-Stokes Raman scattering. Two flames are compared: a fuel-rich partially premixed flame with moderate soot concentrations and a second one with the same parameters but additional injection of secondary air. Instantaneous as well as average distributions of the measured quantities are presented and discussed. The measured soot distributions exhibit a high temporal and spatial dynamic. This behavior correlates with broad temperature probability density functions. With injection of secondary air downstream of the flame zone the distributions change drastically. The data set, including PDFs of soot concentration, temperature and flow velocity, is unique in combining different laser diagnostics with a combustor exhibiting a more challenging geometry than existing validation experiments.

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“…We used the complex refractive index of 1.60-0.59i [20] for both the extinction wavelength (532 nm) and the LII signal wavelength (450 nm). Combination of Eq.…”

Section: LIImentioning

confidence: 99%

Investigation of laminar pressurized flames for soot model validation using SV-CARS and LII

Geigle

Schneider-Kühnle

Tsurikov

et al. 2005

Proceedings of the Combustion Institute

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Refractive indices of soot particles deduced from in-situ laser light scattering measurements

Cited by 58 publications

References 19 publications

Laser-induced incandescence for soot particle size measurements in premixed flat flames

Laser-induced incandescence for soot particle size measurements in premixed flat flames

Experimental Analysis of Soot Formation and Oxidation in a Gas Turbine Model Combustor Using Laser Diagnostics

Investigation of laminar pressurized flames for soot model validation using SV-CARS and LII

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