Measurements of premixed-flame turbulence generation and modification in a Taylor–Couette burner

Turbulent, premixed lean methane–air flames were studied experimentally in a Taylor–Couette burner, extending the previous work of non-reacting turbulent-flow measurements. A laser-Doppler velocimetry system is employed to measure velocity fluctuations in the circumferential direction at the center...

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Bibliographic Details
Published in:Experimental thermal and fluid science 2007-10, Vol.32 (1), p.85-97
Main Authors: Arjomand-Kermani, Amir M., Aldredge, Ralph C.
Format: Article
Language:English
Subjects:
AIR
AMPLIFICATION
Applied sciences
AUGMENTATION
BURNERS
COMBUSTION
CYLINDERS
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
FLAMES
FLUCTUATIONS
Fluid dynamics
Fluid flow
FREQUENCY DEPENDENCE
Furnaces. Firing chambers. Burners
Gaseous fuel burners and combustion chambers
IGNITION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LENGTH
METHANE
MODIFICATIONS
Premixed flames
REYNOLDS NUMBER
ROTATION
SPECTRA
Taylor–Couette
TURBULENCE
TURBULENT FLOW
VELOCITY
Walls
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Summary:Turbulent, premixed lean methane–air flames were studied experimentally in a Taylor–Couette burner, extending the previous work of non-reacting turbulent-flow measurements. A laser-Doppler velocimetry system is employed to measure velocity fluctuations in the circumferential direction at the center of the annulus where mean velocities are nearly zero. Turbulence parameters such as the intensities, approximated integral and micro-time and length scales and one-dimensional frequency spectra are obtained for the flow-field ahead and behind the flame front. The frequency spectra exhibit a −5/3 slope reaffirming isotropic characteristics. It is found that there is an increase in intensity, turbulence Reynolds number and energy across a broad range of frequencies behind the flame along with a shift toward larger scales. However, there appears to be a decrease in amplification of the intensities and turbulence Reynolds number with increasing pre-ignition turbulence in the burner (generated by counter-rotation of the cylinder walls). Results suggest that the presence of flame-generated turbulence in the TC burner is sensitive to both pre-ignition turbulence and equivalence ratio.
ISSN:0894-1777
1879-2286
DOI:10.1016/j.expthermflusci.2007.02.002