덕트형 연소기에서 화염의 동특성에 관한 실험적 연구

다국어 초록 (Multilingual Abstract)

The characteristics of flame dynamics occurring near the bluff body was experimentally investigated in a model combustor with V-gutter bluff body. Measurements of chemiluminescence with high speed camera and PIV were performed for visualization of flame structure. Flashback occurs due to the change of pressure gradient in the combustor, and the flashback distance depends on equivalent ratio. Unstable flames can be classified into three types depending on the flashback distance and structure. When the flame goes over the bluff body, an unusual flame structure occurs at the front of the bluff body. Re-stabilization takes place as the flame moves downstream of the combustor. This process is supported by a strong vortex structure behind the bluff body.

참고문헌 (Reference)

1 Prasad, A., "The instability of the shear layer separating from a bluff body" 333 : 375-402, 1997

2 Yamaguchi, S., "Structure and blow-off mechanism of rod-stabilized premixed flame" 62 (62): 31-41, 1985

3 Vaneveld, L., "Secondary Effects in Combustion Instabilities Leading to Flashback" 22 (22): 81-82, 1984

4 Bloxsidge, G. J., "Reheat buzz: an acoustically coupled combustion instability. Part 2. Theory" 193 : 445-473, 1988

5 Langhorne, P. J., "Reheat buzz: an acoustically coupled combustion instability. Part 1. Experiment" 19 (19): 417-443, 1988

6 Bush, S. M., "Reacting and Nonreacting Flowfields of a V-Gutter Stabilized Flame" 45 (45): 662-672, 2007

7 Roshko, A., "On the Development of Turbulent Wakes from Vortex Streets" California Institute of Technology 1953

8 Thibaut, D., "Numerical Study of Unsteady Turbulent Premixed Combustion: Application to Flashback Simulation" 113 (113): 53-65, 1998

9 Keller, J. O., "Mechanism of Instabilities in Turbulent Combustion Leading to Flashback" 20 (20): 254-252, 1982

10 Shanbhogue, S. J., "Lean blowoff of bluff body stabilized flames: Scaling and dynamics" 35 (35): 98-120, 2009

11 Sommerer, Y., "Large eddy simulation and experimental study of flashback and blow-off in a lean partially premixed swirled burner" 5 (5): 2004

12 Chandrasekhar, S., "Hydrodynamic and Hydromagnetic Stability" Oxford University Press 1961

13 Zukoski, E. E., "Flame Stabilization on Bluff Bodies at Low and Intermediate Reynolds Numbers" California Institute of Technology 1954

14 Longwell, J. P., "Flame Stability in Bluff Body Recirculation Zones" 45 (45): 1629-1633, 1953

15 Nauert, A., "Experimental analysis of flashback in lean premixed swirling flames: conditions close to flashback" 43 : 89-100, 2007

16 Chaudhuri, S., "Blowoff dynamics of bluff body stabilized turbulent premixed flames" 157 (157): 790-802, 2010

17 Birch, A. D., "An Experimental Study of a Turbulent Natural Gas jet in a Cross-Flow" 66 : 217-232, 1989

18 Dowling, A. P., "A kinematic model of a ducted flame" 394 : 51-72, 1999

19 Kiel, B., "A Detailed Investigation of Bluff Body Stabilized Flames" AIAA 2007