Vortex structures and temperature fluctuations in a bluff-body burner |
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| Authors: | T Nishimura T Kaga K Shirotani J Kadowaki |
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| Institution: | (1) Department of Mechanical Engineering, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA;(2) Department of Mechanical Engineering, New Mexico State University, Las Cruces, NM 88003, USA;(3) Sandia National Laboratories, Fire Sciences and Technologies, Albuquerque, NM 87123, USA |
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| Abstract: | Vortical and thermal structures of non-premixed propane flame in a bluff-body burner are studied experimentally in the transition
from laminar to turbulent flow. In particular, we focus attention on the effect of annular air flow on the flame. The small-scale
inner vortices inside the flame is stimulated by the annular air flow, and outside the flame, small eddies due to turbulence
rather than the large-scale outer vortices due to thermal buoyancy become dominant with increasing air velocity. The interrelation
between the vortical and thermal structures is analyzed by looking at the frequency spectrum and probability density function
of temperature fluctuations. |
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