The turbulence structure of the wake of a thin flat plate at post-stall angles of attack

2017 ◽  
Vol 58 (6) ◽  
Author(s):  
Meraj Mohebi ◽  
David H. Wood ◽  
Robert J. Martinuzzi
Keyword(s):  
Flat Plate ◽  
Turbulence Structure

Development of the turbulent near wake of a tapered thick flat plate

1988 ◽  
Vol 189 ◽  
pp. 135-163 ◽  
Author(s):  
A. Haji-Haidari ◽  
C. R. Smith
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Flat Plate ◽  
Wall Region ◽  
Turbulence Structure ◽  
Near Wake ◽  
Growth Region ◽  
Trailing Edge ◽  
Centreline Velocity ◽  
Hot Film

The velocity field and turbulence structure in the near wake of a thick flat plate with a tapered trailing-edge geometry are examined using both hydrogen-bubble flow visualization and hot-film anemometry measurements. Tests were conducted for Re1 = 8.5 × 105 in the region 0 < x+ < 6400 behind the trailing edge. The probe and visualization results indicate a similarity between both (i) velocity and turbulence structure variations wih x+ in the near wake, and (ii) the corresponding changes in similar flow characteristics with y+ within a turbulent boundary layer. In particular, visualization data in the vicinity of the wake centreline reveal the existence of strong streamwise flow structures in the region close (x+ < 270) to the trailing edge. The streamwise orientation of the observed structures diminishes as x+ increases. From hot-film measurements, two separate regions along the wake centreline can be distinguished: (i) a linear growth region which extends over 0 < x+ < 100, wherein the centreline velocity varies linearly with x+; and (ii) a logarithmic growth region for x+ > 270, wherein the centreline velocity varies as log x+. The similarity in behaviour between these regions and the comparable wall region of a turbulent boundary layer suggests the existence of a common functionality. This similarity is demonstrated by a simple linear relationship of the form y+ = Kx+, which is shown to approximately collapse the velocity behaviour both across a turbulent boundary layer and along the wake centreline to a unified set of empirical relationships.

scholarly journals Turbulence structure in the intermediate wake of a rotating flat plate. Phase-averaged structure of coherent and random components.

1987 ◽  
Vol 53 (487) ◽  
pp. 797-803
Author(s):  
Yasuhiro SUZUKI ◽  
Masaru KIYA ◽  
Tsuyoshi TAKAHASHI
Keyword(s):  
Flat Plate ◽  
Turbulence Structure ◽  
Random Components

scholarly journals Turbulence structure in the intermediate wake of a rotating flat plate. (Large-scale vortices)

1986 ◽  
Vol 52 (484) ◽  
pp. 3898-3904 ◽  
Author(s):  
Yasuhiro SUZUKI ◽  
Masaru KIYA ◽  
Tsuyoshi TAKAHASHI
Keyword(s):  
Flat Plate ◽  
Large Scale ◽  
Turbulence Structure

scholarly journals Turbulence structure near a sharp density interface

1988 ◽  
Vol 189 ◽  
pp. 189-209 ◽  
Author(s):  
Imad A. Hannoun ◽  
Harindra J. S. Fernando ◽  
E. John List
Keyword(s):  
Kinetic Energy ◽  
Flat Plate ◽  
Turbulent Kinetic Energy ◽  
Turbulent Velocity ◽  
Laser Doppler Velocimeter ◽  
Turbulence Structure ◽  
Vertical Velocity Component ◽  
Density Interface ◽  
Density Interfaces ◽  
Rigid Walls

The effects of a sharp density interface and a rigid flat plate on oscillating-grid induced shear-free turbulence were investigated experimentally. A two-component laser-Doppler velocimeter was used to measure turbulence intensities in and above the density interface (with matched refractive indices) and near the rigid flat plate. Energy spectra, velocity correlations, and kinetic energy fluxes were also measured. Amplification of the horizontal turbulent velocity, coupled with a sharp reduction in the vertical turbulent velocity, was observed near both the density interface and the flat plate. These findings are in agreement with some previous results pertaining to shear-free turbulence near rigid walls (Hunt & Graham 1978) and near density interfaces (Long 1978). The results imply that, near the density interface, the turbulent kinetic energy in the vertical velocity component is only a small fraction of the total turbulent kinetic energy and indicate that the effects of the anisotropy created by the density interface or the flat plate are confined to the large turbulence scales.

Examination of Rabbit Fc Crystals

1968 ◽  
Vol 26 ◽  
pp. 140-141
Author(s):  
J. P. Robinson ◽  
P. G. Lenhert
Keyword(s):  
Molecular Weight ◽  
Flat Plate ◽  
Phosphate Buffer ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
X Ray ◽  
Neutral Ph ◽  
Small Crystals ◽  
Carbon Coated ◽  
Diffraction Patterns

Crystallographic studies of rabbit Fc using X-ray diffraction patterns were recently reported. The unit cell constants were reported to be a = 69. 2 A°, b = 73. 1 A°, c = 60. 6 A°, B = 104° 30', space group P21, monoclinic, volume of asymmetric unit V = 148, 000 A°3. The molecular weight of the fragment was determined to be 55, 000 ± 2000 which is in agreement with earlier determinations by other methods.Fc crystals were formed in water or dilute phosphate buffer at neutral pH. The resulting crystal was a flat plate as previously described. Preparations of small crystals were negatively stained by mixing the suspension with equal volumes of 2% silicotungstate at neutral pH. A drop of the mixture was placed on a carbon coated grid and allowed to stand for a few minutes. The excess liquid was removed and the grid was immediately put in the microscope.

THE THERMAL MODEL OF A FLAT-PLATE SOLAR WATER-HEATING COLLECTOR

2016 ◽  
pp. 12-20 ◽  
Author(s):  
R. R. Avezov ◽  
N. R. Avezova ◽  
E. Yu. Rakhimov
Keyword(s):  
Flat Plate ◽  
Thermal Model ◽  
Water Heating ◽  
Solar Water Heating ◽  
Solar Water

A LOOK AT PRESTRESSED FLAT PLATE DESIGN AND CONSTRUCTION

PCI Journal ◽  
1969 ◽  
Vol 14 (6) ◽  
pp. 62-77
Author(s):  
George D. Nasser
Keyword(s):  
Flat Plate ◽  
Plate Design ◽  
Design And Construction
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