Flow structure and combustion in nonpremixed turbulent bluff-body stabilized flames
Abstract
The flow structures and combustion characteristics of bluff-body stabilized flames were studied using planar flow visualization and direct flame photography. In the planar flow visualization the fuel was seeded with alumina particles and a thin sheet of laser light was used to illuminate the field of view. Mie scattering from the particles in the illuminated plane was then recorded on photographic film. For fixed fuel velocity and low air velocity the particle streak photographs showed a three-dimensional vortical flow structure near the burner face that acted to stabilize the flame at the bluff-body face. For high air velocity, the vortical structures were not observed and the flames were detached. In this case, the fuel jet stagnates on the axis, which stabilizes the flame away from the burner face. Short-exposure Mie scattering images were used to provide detailed information about the turbulent structures that occur in bluff-body flames. These structures can be large, irregular and time varying. It is concluded that instantaneous planar imaging diagnostic techniques are very useful for the characterization of these flames. The experimental results obtained in this study are anticipated to provide new insight into the combustion characteristics of bluff-body flames, insight that should prove useful inmore »
- Authors:
- Publication Date:
- Research Org.:
- Sandia National Labs., Livermore, CA (USA)
- OSTI Identifier:
- 7158813
- Report Number(s):
- SAND-86-8695; CONF-860804-17
ON: DE88011807
- DOE Contract Number:
- AC04-76DR00789
- Resource Type:
- Conference
- Resource Relation:
- Conference: 21. international symposium on combustion, Munich, F.R. Germany, 3 Aug 1986
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; FLAMES; COMBUSTION PROPERTIES; FLOW MODELS; FLOW VISUALIZATION; STREAK PHOTOGRAPHY; COMBUSTION; FLAME PROPAGATION; FUEL INJECTION SYSTEMS; FUEL-AIR RATIO; GAS FLOW; IGNITION; MIXING; TURBULENT FLOW; CHEMICAL REACTIONS; FLUID FLOW; FUEL SYSTEMS; MATHEMATICAL MODELS; OXIDATION; PHOTOGRAPHY; THERMOCHEMICAL PROCESSES; 421000* - Engineering- Combustion Systems
Citation Formats
Namazian, M, Kelly, J, Schefer, R W, and Johnston, S C. Flow structure and combustion in nonpremixed turbulent bluff-body stabilized flames. United States: N. p., 1986.
Web.
Namazian, M, Kelly, J, Schefer, R W, & Johnston, S C. Flow structure and combustion in nonpremixed turbulent bluff-body stabilized flames. United States.
Namazian, M, Kelly, J, Schefer, R W, and Johnston, S C. 1986.
"Flow structure and combustion in nonpremixed turbulent bluff-body stabilized flames". United States.
@article{osti_7158813,
title = {Flow structure and combustion in nonpremixed turbulent bluff-body stabilized flames},
author = {Namazian, M and Kelly, J and Schefer, R W and Johnston, S C},
abstractNote = {The flow structures and combustion characteristics of bluff-body stabilized flames were studied using planar flow visualization and direct flame photography. In the planar flow visualization the fuel was seeded with alumina particles and a thin sheet of laser light was used to illuminate the field of view. Mie scattering from the particles in the illuminated plane was then recorded on photographic film. For fixed fuel velocity and low air velocity the particle streak photographs showed a three-dimensional vortical flow structure near the burner face that acted to stabilize the flame at the bluff-body face. For high air velocity, the vortical structures were not observed and the flames were detached. In this case, the fuel jet stagnates on the axis, which stabilizes the flame away from the burner face. Short-exposure Mie scattering images were used to provide detailed information about the turbulent structures that occur in bluff-body flames. These structures can be large, irregular and time varying. It is concluded that instantaneous planar imaging diagnostic techniques are very useful for the characterization of these flames. The experimental results obtained in this study are anticipated to provide new insight into the combustion characteristics of bluff-body flames, insight that should prove useful in developing the next generation of computer models describing such flames. 8 refs., 6 figs., 4 tabs.},
doi = {},
url = {https://www.osti.gov/biblio/7158813},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 01 00:00:00 EST 1986},
month = {Tue Apr 01 00:00:00 EST 1986}
}