Five different flame states are identified in a compact combustion chamber that is fired by a 30 kW swirl-stabilized partially premixed natural gas burner working at atmospheric pressure. These flame states include a nozzle-attached tulip shaped flame, a nonattached torroidal-ring shaped flame (SSF) suitable for very low NOx emission in a gas turbine combustor and a Coanda flame (CSF) that clings to the bottom wall of the combustion chamber. Flame state transition is generated by changing the swirl number and by premixing the combustion air with 70% of the natural gas flow. The flame state transition pathways reveal strong hysteresis and bifurcation phenomena. The paper also presents major species concentrations, temperature and velocity profiles of the lifted flame state and the Coanda flame and discusses the mechanisms of flame transition and stabilization.

Issue Section:
Gas Turbines: Combustion and Fuels
Keywords:
flames, combustion, gas mixtures, pattern classification, chemically reactive flow, temperature distribution, stability, mixing
Topics:
Flames, Combustion
1.
Qi, S., Gupta, A. K., and Lewis, M. J., 1997, “Effect of Swirl on Combustion Characteristics in Premixed Flames,” ASME Paper No. 97-GT-276.
2.
Driscoll, J. F., Dahm, W. J. A., and Wu, M. S., 1993, “Scaling Characteristics of Aerodynamics and Low NOx Properties of Industrial Natural Gas Burners, The Scaling 400 Study, Part III: The 30 kW Test Results,” GRI Topical Report 93/0478 or IFRF Doc. No. F40/y/10, GRI, Chicago.
3.
Weber, R., Driscoll, J. F., Dahm, W. J. A., and Waibel, R. T., 1993, “Scaling Characteristics of Aerodynamics and Low NOx Properties of Industrial Natural Gas Burners, The Scaling 400 Study, Part I: Test Plan,” IFRF Doc. No. F40/y/8, IFRF, IJmuiden.
4.
Peters, A. A. F., and Weber, R., 1994, “Mathematical Modeling and Scaling of Fluid Dynamics and NOx Characteristics of Natural Gas Burners,” Int. ASME/EPRI Power Generation Conference, Phoenix, AZ.
5.
Sayre, A., Lallemant, N., Dugue´, J., and Weber, R., 1994, “Scaling Characteristics of Aerodynamics and Low NOx Properties of Industrial Natural Gas Burners, The Scaling 400 Study, Part IV: The 300 kW BERL Test Results,” GRI Topical report 94/0186 or IFRF Doc. No. F40/y/11, IFRF, IJmuiden.
6.
Bee´r, J. M., and Chigier, N. A., 1983, Combustion Aerodynamics, Robert E. Krieger, Melbourne, FL.
7.
Weber
,
R.
, and
Dugue´
,
J.
,
1992
, “
Combustion Accelerated Swirling Flows in High Confinements
,”
Prog. Energy Combust. Sci.
,
18
, pp.
349
–
367
.
8.
Borman, Gary L., and Ragland, Kenneth W., 1998, Combustion Engineering, WCB McGraw-Hill, New York, Chap. 6, pp. 216–221.
9.
Tummers, M. J., 1999, “Investigation of a Turbulent Wake in an Adverse Pressure Gradient Using Laser Doppler Anemometry,” Ph.D. thesis, T.U. Delft.
10.
Vanoverberghe, K., and Van den Bulck, E., 2000, “Low Swirl, Coanda Stabilized and Partially Premixed Natural Gas Flames,” ECSBT2, 2nd European Conference on Small Burner and Heating Technology, Stuttgart, Mar. 16-17, pp. 53–62.
11.
Leuckel, W., 1968, “Swirl Intensities, Swirl Types and Energy Losses of Different Swirl Generating Devices,” Doc. No. GO2/a/16, International Flame Research Foundation, IJmuiden, The Netherlands.
12.
http://www.allstar.fiu.edu/aero/coanda.htm
13.
Lieuwen, T., Torres, H., Johnson, C., and Zinn, B. T., 1999, “A Mechanism of Combustion Instability in Lean Premixed Gas Turbine Combustors,” ASME Paper No. 99-GT-003.
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