Statistical Analysis of Soot Volume Fractions, Particle Number Densities and Particle Radii in a Turbulent Diffusion Flame
作者:
H. GEITLINGER,
TH. STREIBEL,
R. SUNTZ,
H. BOCKHORN,
期刊:
Combustion Science and Technology
(Taylor Available online 1999)
卷期:
Volume 149,
issue 1-6
页码: 115-134
ISSN:0010-2202
年代: 1999
DOI:10.1080/00102209908952102
出版商: Taylor & Francis Group
关键词: optical technique;turbulent diffusion flame;soot formation;probability density function;autocorrelation function;turbulent length scales
数据来源: Taylor
摘要:
A recently developed two-dimensional optical technique has been applied for measuring two-dimensional maps of soot volume fractions, particle number densities and mean particle radii in a turbulent acetylene-air diffusion flame. The technique is based on the simultaneous detection of Rayjeigh-Scat-tering and Laser-Induced Incandescence (LII) in combination with the detection of the extinction from one single laser pulse (RAYLIX-technique). Single shot experiments in the investigated flame exhibit small particles in zones of high panicle number densities and vice versa. Mean values and standard deviations are obtained by averaging 1000 single laser shots. The results reveal large relative fluctuations of soot volume fractions, number densities and particle radius in the outer region of the flame due to its turbulent structure. Two-dimensional probability density functions (PDFs) of number density and particle radius are obtained, which provide a useful data basis for future modeling of turbulent flames by means of PDF-models. Finally turbulent length scales are determined from autocorrelation functions. This information is important for engineering and also modeling purposes.
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