Optimization of a premixed low-swirl burner for industrial applications
This study was motivated by recent tests results showing that a 5cm i.d. low-swirl burner (LSB) stabilizes ultra-lean premixed turbulent flames up to 600kW. A parametric study has been performed to determine the optimum ultra-lean LSB configuration, i.e. one that will achieve low NOx and flame stability, for thermal input between 15kW to 150kW. Using Laser Doppler Velocimetry (LDV), non-reacting centerline velocity and rms fluctuation profiles were measured, and were found to show self-similar behavior. This self-similarity may explain why the flame remains stationary relative to the burner exit despite a change in bulk flow velocity from 5 to 90m/s. The recess distance of the swirler affects the shape of the mean and rms velocity profiles. Lean blow-off limits were also determined for various recess distances, and an optimum exit length was found that provides stable operation for ultra-lean flames.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Energy Efficiency and Renewable Energy. Office of Industrial Technologies (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 785291
- Report Number(s):
- LBNL-47802; R&D Project: 84AL01; TRN: AH200131%%255
- Resource Relation:
- Conference: 2nd Joint Meeting of the U.S. Section of the Combustion Institute, Oakland, CA (US), 03/25/2001--03/28/2001; Other Information: PBD: 1 Sep 2000
- Country of Publication:
- United States
- Language:
- English
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