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

Geigle, Klaus Peter; Schneider-Kühnle, Y.; Tsurikov, Michael; Hadef, Redjem; Lückerath, Rainer; Krüger, Volker; Stricker, W.; Aigner, Manfred

doi:10.1016/j.proci.2004.08.158

Cited by 35 publications

(27 citation statements)

References 26 publications

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“…The proportionality constant C cal , which is given by the optical system, may be obtained by calibration measurements of flames with a known soot volume fraction or by a single soot concentration value acquired by an independent technique, often based upon extinction measurements [49,50] or gravimetric analysis [51]. A self-calibrating LII procedure has also been described by Snelling et al [52] where absolute light intensity is measured and no independent calibration is required.…”

Section: Signal Evaluationmentioning

confidence: 99%

Soot characterization with laser-induced incandescence applied to a laminar premixed ethylene–air flame

Hadef

Geigle

Meier

et al. 2010

International Journal of Thermal Sciences

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a b s t r a c tLaser-induced incandescence (LII) has emerged as a promising non-invasive technique for measuring spatially and temporally resolved soot volume fraction and size. In this investigation we try to assess its performance in more detail by characterizing primary particle sizes using time-resolved LII and soot volume fractions by 2D LII. The experiments were performed at a fixed location in premixed ethylene/air flames burning on a sintered stainless-steel plug (McKenna) burner with varying values of the equivalence ratio for primary particle sizing and on the burner axis for concentration measurements. Maximum soot concentrations follow a power law behavior with equivalence ratio. The primary particle sizes obtained from LII decay curves are in good agreement with the values measured by other techniques and show a clear rise of particle size with equivalence ratio. The data analyzed with the help of a validated LII model will be useful for the further development of soot formation models.

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Section: Signal Evaluationmentioning

confidence: 99%

Soot characterization with laser-induced incandescence applied to a laminar premixed ethylene–air flame

Hadef

Geigle

Meier

et al. 2010

International Journal of Thermal Sciences

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“…In sooting flames, laser-based temperature measurements are problematic due to the presence of particles and large concentrations of aromatic compounds. One of the few techniques that perform reliably under such conditions is CARS in the version of shifted-vibrational CARS [14].…”

Section: Introductionmentioning

confidence: 99%

Investigation of soot formation in pressurized swirl flames by laser measurements of temperature, flame structures and soot concentrations

Geigle

Köhler

O'Loughlin

et al. 2015

Proceedings of the Combustion Institute

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Soot formation and oxidation were investigated in swirl flames operated with ethylene/air at elevated pressure in a gas turbine model combustor with optical access. Coherent anti-Stokes Raman scattering was used for temperature measurements, laser-induced incandescence for soot concentration and laserinduced fluorescence for the determination of OH radical distributions. A major focus of the experiments was the investigation of the influence of the injection of secondary oxidation air into the fuel-rich product gas of the primary combustion zone. Soot is mainly present in tiny filament-like regions left without OH signal. In the 3 bar flame with oxidation air injection these are found in a region separating the primary combustion zone, fed by combustion air and ethylene, and the secondary combustion induced by oxidation air and unburned hydrocarbons (UHC) that are transported into the inner recirculation zone. The different behavior of flames with and without oxidation air is most pronounced in the inner recirculation zone that is strongly influenced by the oxidation air admixture. This is reflected by changed OH distributions, mean temperatures and the shape of the temperature pdfs and results in significantly different soot distributions. The combined temperature statistics and correlated OH and soot distributions acquired at 3 and 5 bar are well suited to support the understanding of soot formation and oxidation and are expected to be a valuable input to soot model validation.

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“…For a more detailed description of the individual techniques see the relevant literature (e.g., for LII Santoro and Shaddix 2002, Michelsen 2003, and Schulz et al 2006. A basic description on the application of the method for 2D-measurements may be found in Will et al (1995Will et al ( , 1996, and information on the uncertainties of the technique is given in Will et al (1998) and Geigle et al (2005). The principle of two-color pyrometry and information on the uncertainty of measurement are reported by di Stasio and Massoli (1994) and Cignoli et al (2001).…”

Section: Methodsmentioning

confidence: 99%

Investigations on Soot Formation in Heptane Jet Diffusion Flames by Optical Techniques

Reimann

Kuhlmann

Will

2010

Microgravity Sci. Technol.

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Two-dimensional optical measurements were performed for the investigation of soot formation of nheptane laminar gas-jet diffusion flames under buoyant and non-buoyant conditions utilizing the Bremen Drop Tower. Techniques employed were laser-induced incandescence for the determination of soot concentration and primary particle sizes and two-color emission pyrometry with a three-point Abel inversion for the measurement of temperature fields. In line with former experiments for other hydrocarbon fuels the investigations revealed drastic differences in the sooting behavior between flames under normal and microgravity. With the lack of buoyancy maximum soot temperatures were reduced by roughly 300 K and maximum primary particle sizes were more than doubled.

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

Cited by 35 publications

References 26 publications

Soot characterization with laser-induced incandescence applied to a laminar premixed ethylene–air flame

Soot characterization with laser-induced incandescence applied to a laminar premixed ethylene–air flame

Investigation of soot formation in pressurized swirl flames by laser measurements of temperature, flame structures and soot concentrations

Investigations on Soot Formation in Heptane Jet Diffusion Flames by Optical Techniques

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