Lean-Premixed, Swirl-Stabilized Flame Response: Flame Structure and Response As a Function of Confinement
| Autor: | Stephen Peluso, Alexander John De Rosa, Domenic A. Santavicca, Bryan D. Quay |
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| Rok vydání: | 2017 |
| Předmět: |
Premixed flame
Materials science Laminar flame speed Turbulence 020209 energy Mechanical Engineering Flame structure Energy Engineering and Power Technology Aerospace Engineering 02 engineering and technology Function (mathematics) Mechanics Fuel Technology 020401 chemical engineering Nuclear Energy and Engineering 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering Atomic physics Combustion chamber |
| Zdroj: | Volume 4A: Combustion, Fuels and Emissions. |
| DOI: | 10.1115/gt2017-63476 |
| Popis: | The effect of confinement (flame-wall interactions) on the response of a turbulent, swirl-stabilized flame is experimentally examined, with a focus on the shape and structure of these flames. A series of three cylindrical combustors of 0.11, 0.15 and 0.19 m diameter are used to vary the degree of confinement experienced by the flame. Using CH* chemiluminescence images, the shape of the flame in each combustor is described. These images are then further analyzed and reveal marked similarities in the geometry and location of these flames in a defined ‘flame base’ region near the combustor inlet. This similarity in location of the flame base leads to a similarity in the response of this portion of the flame to imposed oscillations. In particular, the phase of the fluctuations in this region are shown to be the same in each confinement. The nature of the fluctuations in the mean flame position are also shown to be similar in each confinement. These results indicate that the geometry of the flame in the base region is not a function of confinement and that the flames are responding to the same convective mechanisms, and in the same manner, in this region of the flame. |
| Databáze: | OpenAIRE |
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