Flickering frequency and NO{sub x} and CO emission indexes of an unsteady laminar diffusion flame for varying gravitational force using a flamelet model
The effects of varying gravitational force on the natural flickering frequency and on the emission indexes of NO{sub x} and CO of an unsteady laminar methane diffusion flame are investigated numerically. A second-order time-accurate numerical scheme is developed for solving the transient Navier-Stokes equations with the low Mach number formulation. With the flamelet model, this numerical scheme provides an efficient tool for studying transient flame behavior. The computed flickering frequencies exhibit an approximate inverse square root dependence on Froude number. A linear stability analysis is performed to gain insight into the physical nature of the flickering behavior. The numerical model predicts a strong influence of gravitational force on instantaneous and time-averaged emission indexes of NO{sub x} and CO.
- Research Organization:
- Sandia Labs., Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 239319
- Report Number(s):
- SAND-96-8494C; CONF-960772-4; ON: DE96006488; TRN: 96:003412
- Resource Relation:
- Conference: 26. international symposium on combustion, Naples (Italy), 28 Jul - 2 Aug 1996; Other Information: PBD: 1996
- Country of Publication:
- United States
- Language:
- English
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