The effects of rapid heating of soot: Implications when using laser-induced incandescence for soot diagnostics
- NYMA Inc., Brookpark, OH (United States)
- Univ. of Illinois, Chicago, IL (United States). Dept. of Mechanical Engineering
Recent experimental efforts have exploited the high temporal and spatial resolution of laser-induced incandescence (LII) as both a qualitative and quantitative measure of soot volume fraction. As a relatively new diagnostic technique, issues remain as to appropriate excitation laser intensities and the potential intrusive characteristics of LII. The high temperatures to which the soot is heated may accelerate heterogeneous reactions between the soot and flame gases. Vaporization of soot by high energy pulsed laser light has been theoretically modeled and experimentally observed. Potential physical and/or chemical changes in the laser-heated soot raises the question of how the LII signal depends upon these changes as well as the inferred soot volume fraction. Thus the authors investigated the effects of high energy pulsed laser light on the soot particles. The results caution use of laser-induced incandescence without careful consideration of excitation laser intensity and possible variation in soot composition at different measurement locations.
- OSTI ID:
- 89637
- Journal Information:
- Combustion and Flame, Vol. 102, Issue 1-2; Other Information: PBD: Jul 1995
- Country of Publication:
- United States
- Language:
- English
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