Study of Longitudinal Curvature Effects in Turbulent Boundary Layers with Application to Drag Reduction PDF Download
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Author: A. J. Smits
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Book Description
This work was concerned with a study of subsonic boundary layer behavior downstream of a 90 degree convex bend with a boundary layer thickness of radius-of-curvature ratio of approximately 0.1. Only mean flow results are available. They indicate that the boundary layer, severely distorted when it exits from the curved region, experiences several stages in the recovery process as it relaxes on the flat plate. These stages are described in detail. Keywords: Turbulence.
Author: A. J. Smits
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Book Description
This work was concerned with a study of subsonic boundary layer behavior downstream of a 90 degree convex bend with a boundary layer thickness of radius-of-curvature ratio of approximately 0.1. Only mean flow results are available. They indicate that the boundary layer, severely distorted when it exits from the curved region, experiences several stages in the recovery process as it relaxes on the flat plate. These stages are described in detail. Keywords: Turbulence.
Author:
Publisher: AIAA
ISBN: 9781600863783
Category : Boundary layer
Languages : en
Pages : 542
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Book Description
Author: Neal Tetervin
Publisher:
ISBN:
Category : Enthalpy
Languages : en
Pages : 92
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Book Description
The equations of motion and total enthalpy are derived for a compressible turbulent boundary layer on an axisymmetric or two-dimensional surface with non-negligible longitudinal curvature. From these equations are derived the integral-momentum, kinetic-energy, and total-enthalpy equations for non-negligible longitudinal curvature. Calculations indicate that if concave curvature increases the skin friction sufficiently separation is delayed although the boundary layer is thickened. Also, an increase in curvature in the direction in which the surface pressure rises acts to hasten separation for concave curvature and delay it for convex curvature. (Author).
Author: B. R. Ramaprian
Publisher:
ISBN:
Category :
Languages : en
Pages : 283
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Author: Albert H. Jeans
Publisher:
ISBN:
Category : Turbulent boundary layer
Languages : en
Pages : 176
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Book Description
Concave curvature has a relatively large, unpredictable effect on turbulent boundary layers. Some, but not all previous studies suggest that a large-scale, stationary array of counter-rotating vortices exists within the turbulent boundary layer on a concave wall. The objective of the present study was to obtain a qualitative model of the flow field in order to increase our understanding of the underlying physics. A large free-surface water channel was constructed in order to perform a visual study of the flow. Streamwise components of mean velocity and turbulence intensity were measured using a hot film anemometer. The upstream boundary was spanwise uniform with a momentum thickness to radius of curvature of 0.05. Compared to flat wall flow, large-scale, randomly distributed sweeps and ejections were seen in the boundary layer on the concave wall. The sweeps appear to suppress the normal mechanism for turbulence production near the wall by inhibiting the bursting process. The ejections appear to enhance turbulence production in the outer layers as the low speed fluid convected from regions near the wall interacts with the higher speed fluid farther out. The large-scale structures did not occur at fixed spanwise locations, and could not be called roll cells or vortices. (Author).
Author: S. A. Eide
Publisher:
ISBN:
Category : Turbulent boundary layer
Languages : en
Pages : 116
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Author: Ramakrishna Balasubramanian
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 28
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Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 360
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Book Description
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 696
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