Research output per year
Research output per year
Abstract
“The laser-induced incandescence (LII) signal is proportional to soot volume fraction” is an often used statement in scientific papers, and it has – within experimental uncertainties – been validated in comparisons with other diagnostic techniques in several investigations. In 1984 it was shown theoretically in a paper by Melton that there is a deviation from this
statement in that the presence of larger particles leads to some overestimation of soot volume fractions. In the present paper we present a detailed theoretical investigation of how the soot particle size influences the relationship between LII signal and soot volume fraction for different experimental conditions. Several
parameters have been varied; detection wavelength, time and delay of detection gate, ambient gas temperature and pressure, laser fluence, level of aggregation and spatial profile. Based on these results we are able, firstly, to understand how experimental conditions should be chosen in order to minimize the errors introduced when assuming a linear dependence between the signal and volume fraction and secondly, to obtain knowledge on how to use this information to obtain more accurate soot volume fraction data if the particle size is known.
statement in that the presence of larger particles leads to some overestimation of soot volume fractions. In the present paper we present a detailed theoretical investigation of how the soot particle size influences the relationship between LII signal and soot volume fraction for different experimental conditions. Several
parameters have been varied; detection wavelength, time and delay of detection gate, ambient gas temperature and pressure, laser fluence, level of aggregation and spatial profile. Based on these results we are able, firstly, to understand how experimental conditions should be chosen in order to minimize the errors introduced when assuming a linear dependence between the signal and volume fraction and secondly, to obtain knowledge on how to use this information to obtain more accurate soot volume fraction data if the particle size is known.
| Original language | English |
|---|---|
| Pages (from-to) | 109-125 |
| Journal | Applied Physics B: Lasers and Optics |
| Volume | 90 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2008 |
Subject classification (UKÄ)
- Atom and Molecular Physics and Optics
Free keywords
- Laser-induced incandescence Soot diagnostics Heat and mass transfer model
Fingerprint
Dive into the research topics of 'On the dependence of the laser-induced incandescence (LII) signal on soot volume fraction for variations in particle size'. Together they form a unique fingerprint.Research output
- 1 Doctoral Thesis (compilation)
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On the Use of Laser-Induced Incandescence for Soot Diagnostics: From Theoretical Aspects to Applications in Engines
Bladh, H., 2007, Avdelningen för Förbränningsfysik, Fysiska Institutionen, Lunds Tekniska Högskola. 220 p.Research output: Thesis › Doctoral Thesis (compilation)
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