Flow and mixing structures in bluff-body stabilized gas flames
The mixing and combustion process has been studied in a bluff-body stabilized, nonpremixed flame using direct flame photography and planar flow visualization. The burner consisted of a central jet of CH4 and an outer coflowing air stream. Direct flame photography was used to study the effects of fuel and air flowrate on the global characteristics of the flame. Planar flow visualization techniques using Mie scattering from seed particles added to the fuel jet and Raman scattering from C4 provided information on the interaction between turbulent mixing and combustion chemistry. The results show that the flow is highly three dimensional. Roll-up structures, which form randomly, are evident on the fuel and combustion air boundaries. Stabilization of the flame is dominated by large-scale turbulent mixing structures which are irregular and time-varying. 4 figs.
- Research Organization:
- Acurex Corp., Mountain View, CA (USA); Sandia National Labs., Livermore, CA (USA); Yale Univ., New Haven, CT (USA)
- DOE Contract Number:
- AC04-76DR00789
- OSTI ID:
- 6165354
- Report Number(s):
- SAND-85-8864; CONF-8509229-1; ON: DE86005648
- Resource Relation:
- Conference: International gas research conference, Toronto, Canada, 8 Sep 1985
- Country of Publication:
- United States
- Language:
- English
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