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Soot formation and oxidation in oscillating methane-air diffusion flames at elevated pressure.
Janbernd Hentschel1, Rainer Suntz, Henning Bockhorn
1Institut für Technische Chemie und Polymerchemie, Universität Karlsruhe (TH), Kaiserstrasse 12, 76128 Karlsruhe, Germany. hentschel@ict.uni-karlsruhe.de
Applied Optics
|November 8, 2005
Summary
Pulsating diffusion flames exhibit different soot tendencies compared to stationary ones. Soot production in oscillating flames is phase-shifted and asymmetric relative to fuel flow oscillations, impacting soot formation.
Area of Science:
- Combustion science
- Chemical engineering
- Aerosol science
Background:
- Soot formation in diffusion flames is a critical issue in combustion.
- Understanding soot behavior under dynamic conditions is essential for controlling emissions.
Purpose of the Study:
- To compare the sooting tendency of stationary diffusion flames with pulsating diffusion flames.
- To investigate the impact of oscillating fuel flow on soot particle properties and flame structure.
Main Methods:
- Utilized the RAYLIX method, combining Rayleigh scattering, laser-induced incandescence, and extinction measurements for time-resolved soot particle property determination.
- Monitored flame luminosity (590 nm) and OH*-chemoluminescence (310 nm) to analyze flame structure.
Main Results:
- Mean soot volume fractions in oscillating flames differed significantly from stationary flames at the same mean fuel flow rate.
- Oscillations in total soot amount were phase-shifted and asymmetric compared to fuel flow oscillations.
Conclusions:
- Fuel flow oscillations markedly alter soot production dynamics in diffusion flames.
- The findings provide insights into controlling soot emissions through modulated fuel supply.