Results 171 to 180 of about 21,455 (208)

Mechanism of Flame Stabilization in Turbulent, Lifted-Jet Flames

Combustion and Flame, 1998
Particle image velocimetry was used to study the velocity field in the stabilization region of lifted, turbulent CH 4 -jet flames over a range of Reynolds numbers from 7000 to 19,500. Measured velocities at the flame base are considerably below the turbulent flame speeds derived from previous studies and show a dependence on the Reynolds number.
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Velocity fluctuations in turbulent jets and flames

Symposium (International) on Combustion, 1969
The aim of this work was to develop simple and reliable techniques for turbulence detection in flames. Two approaches were followed, one based on properties of the equations of motion and the other based on properties of impact probes with differing geometry.
H.A. Becker, A.P.G. Brown
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Experiments on axisymmetrically pulsed turbulent jet flames

AIAA Journal, 1990
An experimental study of the effects of strong axisymmetric pulsing on a free, vertical turbulent jet diffusion flame is presented. The jet flame was pulsed over the frequency range of 2-1300 Hz with amplitudes ranging from 0.13-0.89 of the centerline jet velocity.
Jeffery A. Lovett, Stephen R. Turns
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Turbulent jet diffusion flames: consolidation of flame height data

Combustion and Flame, 1999
Literature data on flame heights of turbulent jet diffusion flames are examined in ratios to flame heights of purely buoyant turbulent diffusion flames. The flame height ratio is found to be a function of the gas release momentum in ratio to the momentum generated by a purely buoyant flame.
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Scaling of buoyant turbulent jet diffusion flames

Combustion and Flame, 1991
Abstract Approximate solutions are derived for large buoyant jet diffusion flames into still and horizontally co-flowing air. The fuel jet issues at an angle to the horizontal varying from 0° to 90°. The approximation is based on top hat profiles for the axial velocity and the mixture fraction variable as well as on a simple differential equation for
N. Peters, J. Göttgens
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Concentration Fluctuations in Turbulent Jet Diffusion Flames

Combustion Science and Technology, 1974
Abstract A model for the concentration fluctuations in a turbulent diffusion flame is presented. It incorporates the features of intermittency, random fluctuations of stoichiometry within the turbulent fluid and of fuel and oxygen separation either side of the reaction front.
R. W. BILGER, J. H. KENT
openaire   +1 more source

Temporal Behavior of Lifted Turbulent Jet Flames

Combustion Science and Technology, 2000
Measurements of the fluctuating liftoff height of turbulent jet flames were made using a linear photo-diode array. A wide range of experimental conditions was investigated, including varying the fuel, nozzle diameter and liftoff height. The amplitudes of the fluctuations in h were found to be of the order of the local large scale of the jet.
Hammer, Jay A., Roshko, Anatol
openaire   +2 more sources

Stabilization in turbulent lifted deflected-jet flames

Proceedings of the Combustion Institute, 2002
The stabilization region of two turbulent lifted deflected-jet flames injected at 45° into a cross-flow is investigated. The two flames with the same jet Reynolds number ( Re d =6000), but with different crossflow speeds ( U cr =1.8 and 3.0 m/s), are compared to understand the stabilization mechanism of such jet flames.
Donghee Han, M.G. Mungal
openaire   +1 more source

Vortex-flame interactions and extinction in turbulent jet diffusion flames

Symposium (International) on Combustion, 1996
Unsteady vortex-flame interactions and subsequent local extinction have been investigated in double-concentric turbulent methane jet diffusion flames stabilized on a thick-walled fuel tube using joint Mie scattering/thin-filament pyrometry (MS/TFP) and two-color particle image velocimetry (PIV).
Fumiaki Takahashi, W. John Schmoll, Darryl D. Trump, Larry P. Goss   +3 more
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Large Eddy Simulation of a Turbulent Reacting Jet‐Flame

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 2001
AbstractThe high nonlinearity of the chemical reaction terms requires a closure model for the chemical source terms occurring in the spatially filtered scalar transport equations. Based on the Conditional Moment Closure hypothesis a new model was recently proposed for LES of non‐premixed combustion.
Steiner, H., Bushe, W. K.
openaire   +2 more sources