좁은 채널 내부의 수직 혼합 경계층에 형성된 메탄-공기 에지-화염의 안정화 기초 실험

다국어 초록 (Multilingual Abstract)

Flame stabilization characteristics were experimentally investigated in a fuel-air cross flowing mixing layer. A combustor consists of a narrow channel of air steam and a cross flowing fuel. Depending on the flow rates of methane and air, flame can be stabilized in two modes. First is an attached flame which is formulated at the backward step where the methane and air streams meet. Second is a lifted-flame which is formulated within the mixing layer far down steam from backward step. The heights and flame widths of the lifted flames were measured. Flame shapes of the lifted flames were similar to an ordinary edge flame or a tribrachial flame, and their behavior could be explained with the theories of an edge flame. With the increase of the mixing time between fuel and air, the fuel concentration gradient decreases and the flame propagation velocity increases. Thus the flame is stabilized where the flow velocity is matched to the flame propagation velocity in spite of a significant disturbance in the fuel mixing and heat loss within the channel. This study provides many experimental results for a higher fuel concentration gradient, and it can also be helpful for the development and application of a smaller combustor.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 실험 장치 및 방법
• 3. 실험 결과 및 고찰
• 4. 결론
• 후기
• 참고문헌

참고문헌 (Reference)

1 Kim, N.I., "The Propagation of Tribrachial Flames in a Confined Channel" 146 : 168-179, 2006

2 Carnell Jr. W.F, "Stable Negative Edge Flame Formation In a Counterflow Burner" 141 : 350-359, 2005

3 Chung, S.H., "Stabilization, Propagation and Instability of Tribrachial Triple Flames" 31 : 877-892, 2007

4 Lee, B.J., "Stabilization of Lifted Tribrachial Flames in a Laminar Nonpremixed Jet" 109 : 163-172, 1997

5 Ko, Y.S., "Propagation of Unsteady Tribrachial Flames in Laminar Nonpremixed Jets" 118 : 151-163, 1999

6 Chung, S.H., "On the Characteristics of Laminar Lifted Flames in a Nonpremixed Jet" 86 : 62-72, 1991

7 Pernandez-Pello, A.C., "Micropower Generation Using Combustion: Issues and Approaches" 29 : 883-899, 2002

8 Won, S.H., "Lifted Flame Satbilization in Developing and Developed Regions of Coflow Jets for Highly Diluted Propane" 28 : 2093-2099, 2000

9 Kim, N.I, "Lift-off Characteristics of Triple Flame with Concentration Gradient" 30 : 367-374, 2005

10 Currie, I.G., "Fundamental Mechanics of Fluids" McGraw-Hill Inc. 266-291, 1974

11 Phillips, H., "Flame in a Buoyant Methane Layer" 10 : 1277-1283, 1965

12 Dold, J.W., "Flame Propagation in a Nonuniform Mixture: Analysis of a Slowly Varying Triple Flame" 76 : 71-88, 1989

13 Takita, K., "Experimental Study of Premixed Single Edgeflame in a Counterflow Field" 136 : 364-370, 2004

14 Ruetsch, G.R., "Effects of Heat Release on Triple Flames" 7 (7): 1447-1454, 1995

15 Buckmaster, J., "Edge-flames" 28 (28): 435-475, 2002

16 Miesse, C., "Diffusion Flame Instabilities in a 0.75 mm Non-premixed Microburner" 30 (30): 2499-2507,

17 Vican, J., "Development of a Microreactor as a Thermal Source for Microelectro- Mechanical Systems Power Generation" 29 : 909-916, 2002

18 Seo, J.I., "An Experimental Study of the Fuel Dilution Effect on the Propagation of Methane-Air Tribrachial Flames" 153 : 355-366, 2008