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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v3.i1-6.360
pages 350-362

SOOT DIAGNOSTICS BASED ON SIMULTANEOUS MEASUREMENTS OF SOOT PARTICLE SIZE AND OF ITS TEMPERATURE-DEPENDENT OPTICAL CONSTANT IN FLAMES

B. Ineichen
Swiss Federal Institute of Technology, Internal Combustion Engines Laboratory Ch-8092 Zurich, Switzerland
B. Mandel
Swiss Federal Institute of Technology, Internal Combustion Engines Laboratory CH-8092 Zurich, Switzerland

RÉSUMÉ

To acquire a better understanding of soot particle origin and growth, it is necessary to measure particle sizes in a flame and compare this with theoretical investigations. Accurate determination of the complex temperature dependent refractive index is the major problem in the measurement of soot particles.
Two step procedures, one using an opto-acoustic laser beam deflection technique to measure the soot temperature and the other a light scattering polarization ratio method to measure the refractive index, were examined.
The change in optical properties and the underlying change in particle characteristics are determined by the scattering/polarization ratio method and the transmission/attenuation coefficient factor ratio method. By scattering and transmission measurements, the refractive index and the particle diameter can be accurately determined.
These combination of soot temperature measurement and optical properties of soot will be discussed by the determination of temperature profiles in a sooting flame.


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