Laser Doppler Measurements of Turbulence in a Two-dimensional Wall Jet on a Flat Plate in Stagnant Surroundings PDF Download
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Author: Mark Edward Schneider
Publisher:
ISBN:
Category :
Languages : en
Pages : 708
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Author: Mark Edward Schneider
Publisher:
ISBN:
Category :
Languages : en
Pages : 708
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 836
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Author: A. J. Lightman
Publisher:
ISBN:
Category : Anemometer
Languages : en
Pages : 139
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A two-dimensional laser Doppler anemometer was designed to take measurements in a ducted coaxial flow system having a centerbody separating the jets. The measurements, made in isothermal flow, can be categorized as: central jet only (C02); annular jet only (air); and, combined central and annular jet flow. Radial profiles of the axial and radial/azimuthal velocity were obtained. The central jet only condition approximates a free jet since the central jet diameter is much smaller than the centerbody or duct diameter (1:29.3: 53.2). Measurements of the jet development (diameter, turbulence intensity, etc.) were compared with previous free jet studies. In a study of the isotropy of the turbulent fluctuations it was determined that fully developed turbulent flow begins further downstream than anticipated. Velocity profiles were combined with gas sampling measurements to ascertain jet entrainment. Results show a linear growth of the entrained mass starting at the entrance plane. Downstream (20 diameters) the rate of growth increases to match past studies in that region. The annular jet flow creates a recirculation vortex in the wake of the centerbody. The flowfield was mapped and the streamlines describing the flow were obtained throughout the recirculating flow and further downstream. The location and strength of the vortex center was determined. Velocity scanes were combined to obtain profiles of the average radial and azimuthal components that were directly measured. The interaction of the recirculating annular air jet and the central get was examined. Profiels of the velocity field were obtained for several central jet flow conditions. A normalization plot of the location of the central jet stagnation location agreed well with earlier measurements using a one-dimensional laser doppler anemometer and a different central jet nozzle.
Author: William Joseph Yanta
Publisher:
ISBN:
Category : Laser Doppler velocimeter
Languages : en
Pages : 104
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Turbulence measurements with a Laser Doppler Velocimeter (LDV) using the dual scatter or differential Doppler mode have been made in a subsonic, fully developed channel flow. The measurements were made using only those light scattering particles occurring naturally in air. Results include mean velocity profiles, turbulence intensities, Reynolds stress distributions and a skewness measurement of the velocity distribution function across the channel. Statistical techniques were used to obtain the various turbulence parameters. Guidelines have been established for the amount of data needed to obtain results with a specified accuracy and confidence level. Measurements have also been made to determine the particle-size distribution. An aerodynamic means was used to determine the size distribution, in contrast to the usual optical procedures. (Modified author abstract).
Author: Seung-Bae Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 406
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Author: P. Meyer
Publisher:
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Category :
Languages : en
Pages : 11
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Author:
Publisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages : 428
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 306
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Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 1264
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Author: Hyung Hee Cho
Publisher:
ISBN:
Category :
Languages : en
Pages : 610
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