Wall Pressure Fluctuations Beneath An Axially Summertric Turbulen Boundary Layer On A Cylinder PDF Download
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Author | : Chi-Sheng Yang |
Publisher | : |
Total Pages | : 101 |
Release | : 1969 |
Genre | : Turbulence |
ISBN | : |
Download Wall Pressure Fluctuations Beneath an Axially Symmetric Turbulent Boundary Layer on a Cylinder Book in PDF, ePub and Kindle
Measurements of the turbulent pressure field on the outer surface of a 3 inch diameter cylinder were made at a point 24 feet downstream of the origin of the turbulent boundary layer. The root-mean square wall pressure was 2.42 times the wall shear stress. The normalized power spectrum at high frequencies contained twice the energy density of the spectrum beneath a plane boundary layer. The convection speed was the same as that in a plane boundary layer but the eddy size was smaller by a factor of two. The smaller eddy size and unchanged convection speed account for the greater energy in the spectrum at high frequencies. (Author).
Author | : CHI-SHENG YANG, WILLIAM W. WILLMARTH |
Publisher | : |
Total Pages | : 114 |
Release | : 1969 |
Genre | : |
ISBN | : |
Download WALL PRESSURE FLUCTUATIONS BENEATH AN AXIALLY SUMMERTRIC TURBULEN BOUNDARY LAYER ON A CYLINDER Book in PDF, ePub and Kindle
Author | : William W. Willmarth |
Publisher | : |
Total Pages | : 139 |
Release | : 1975 |
Genre | : |
ISBN | : |
Download Axially Symmetric Turbulent Boundary Layers on Cylinders: Mean Velocity Profiles and Wall Pressure Fluctuations Book in PDF, ePub and Kindle
Experimental studies of the mean velocity profiles and of the wall pressure fluctuations within the axially symmetric turbulent boundary layer on cylinders of various diameters have been made. The measurements include the mean velocity and shear stress on cylinders with diameters ranging from 0.02 to 2.0 inches. A very small hot wire probe and simple anemometer circuit was developed and acoustically calibrated. The hot-wire measurements were used to determine the wall shear stress on the smallest diameter cylinders. A Preston tube was used to measure the shear stress on the larger cylinders.
Author | : John S. Serafini |
Publisher | : |
Total Pages | : 88 |
Release | : 1963 |
Genre | : Fluid dynamics |
ISBN | : |
Download Wall-pressure Fluctuations and Pressure-velocity Correlations in a Turbulent Boundary Layer Book in PDF, ePub and Kindle
This experimental study was carried out at a free-stream Mach number of 0.6 and a Reynolds number per foot of 3.45 x 106. The magnitudes of the wall-pressure fluctuations agree with the Lilley-Hodgson theoretical results. Space-time correlations of the wall-pressure fluctuations generally agree with Willmarth's results for longitudinal separation distances. The convection velocity of the fluctuations is found to increase with increasing separation distances, and its significance is explained. Measurements with the longitudinal component of the velocity fluctuations indicate that the contributions to the wall-pressure fluctuations are from two regions, an inner region near the wall and an outer region linked with the intermittency.
Author | : W. W. Willmarth, C. E. Wooldridge |
Publisher | : |
Total Pages | : 60 |
Release | : 1962 |
Genre | : |
ISBN | : |
Download Measurements of the Fluctuating Pressure at the Wall Beneath a Thick Turbulent Boundary Layer Book in PDF, ePub and Kindle
Author | : M. V. Lowson |
Publisher | : |
Total Pages | : 36 |
Release | : 1965 |
Genre | : Atmospheric pressure |
ISBN | : |
Download Pressure Fluctuations in Turbulent Boundary Layers Book in PDF, ePub and Kindle
Author | : Carolyn Ceder Karangelen |
Publisher | : |
Total Pages | : 420 |
Release | : 1991 |
Genre | : Fluid dynamics |
ISBN | : |
Download Temporal and Spectral Features of Wall Pressure Fluctuations Beneath a Turbulent Boundary Layer Book in PDF, ePub and Kindle
Author | : Juan H. Agui |
Publisher | : |
Total Pages | : 200 |
Release | : 1989 |
Genre | : Turbulent boundary layer |
ISBN | : |
Download A Study of the Wall Pressure Fluctuations in a Turbulent Three-dimensional Boundary Layer Around a Cylinder and Plate Model Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 27 |
Release | : 1993 |
Genre | : |
ISBN | : |
Download The Effect of Transverse Curvature on the Fluctuating Wall Pressure and Structure of Boundary Layer Turbulence Book in PDF, ePub and Kindle
This document consists of the text and viewgraphs of a paper presented at the ONR Workshop on Nonequilibrium Turbulence held at Arizona State University in Tempe, Arizona, from 10-1 2 March 1993. This workshop was the first step of an ONR Accelerated Research Initiative (ARI) to establish the state-of-the-art for theory, computation, and experimentation relevant to turbulence in a nonequilibrium state, or, more generally, to turbulence in complex flows. The overall goal of the initiative is to understand the behavior of turbulence in such complex conditions in order to advance our prediction and control capabilities. When a cylinder in axial flow is sufficiently long and thin, the growth of the boundary layer results in its thickness exceeding the radius of the cylinder such that the three-dimensional effects due to transverse curvature cannot be neglected. With this condition, the wall of the cylinder provides less constraint on the outer flow and motion of eddies than is experienced in an equilibrium flat plate boundary layer, introducing an avenue for enhanced inner-layer/outer-layer interaction and modified turbulence activity. In this paper, we present results of measurements of the fluctuating wall pressure and turbulent streamwise velocity in the turbulent boundary layer on a cylinder in axial flow to identify the coherent structures that contribute to the fluctuating pressure at the wall. Determining the influence of transverse curvature on the relationship between the wall pressure and velocity field allows examination of its effect on the structure of equilibrium boundary layer turbulence.
Author | : Michigan. University. Gas dynamics laboratories |
Publisher | : |
Total Pages | : 129 |
Release | : 1975 |
Genre | : |
ISBN | : |
Download Axially Symetric Turbulent Boundary Layers on Cylinders Book in PDF, ePub and Kindle