Author: William Anton Von Winkle
Publisher:
ISBN:
Category : Fluid flow
Languages : en
Pages : 242
Book Description
Measurements made on some of the characteristics of the turbulent pressure field at the wall of a cylindrical pipe yielded root-mean-square pressure levels, power spectra, longitudinal space-time correlations, and convection velocity over a limited range of Reynolds number. The root-mean-square pressure levels were proportional to the dynamic pressure and when nondimensionalized by use of the dynamic pressure were observed to be independent of the Reynolds number and approximately equal to 0.008 over the Reynolds number range examined. The measurements indicate the existence of an apparent downstrea c nvection of the pressure field at a rate which is approximately the mean discharge velocity of the pipe flow. The pressure field in addition to being convected was also dispersed. Estimates of the scale of the turbulence were obtained. A limited statistical analysis of the pressure time history indicates that the amplitude variation is Gaussian. (Author).
Some Measurements of Longitudinal Space-time Correlations of Wall Pressure Fluctuations in Turbulent Pipe Flow
Author: William Anton Von Winkle
Publisher:
ISBN:
Category : Fluid flow
Languages : en
Pages : 242
Book Description
Measurements made on some of the characteristics of the turbulent pressure field at the wall of a cylindrical pipe yielded root-mean-square pressure levels, power spectra, longitudinal space-time correlations, and convection velocity over a limited range of Reynolds number. The root-mean-square pressure levels were proportional to the dynamic pressure and when nondimensionalized by use of the dynamic pressure were observed to be independent of the Reynolds number and approximately equal to 0.008 over the Reynolds number range examined. The measurements indicate the existence of an apparent downstrea c nvection of the pressure field at a rate which is approximately the mean discharge velocity of the pipe flow. The pressure field in addition to being convected was also dispersed. Estimates of the scale of the turbulence were obtained. A limited statistical analysis of the pressure time history indicates that the amplitude variation is Gaussian. (Author).
Publisher:
ISBN:
Category : Fluid flow
Languages : en
Pages : 242
Book Description
Measurements made on some of the characteristics of the turbulent pressure field at the wall of a cylindrical pipe yielded root-mean-square pressure levels, power spectra, longitudinal space-time correlations, and convection velocity over a limited range of Reynolds number. The root-mean-square pressure levels were proportional to the dynamic pressure and when nondimensionalized by use of the dynamic pressure were observed to be independent of the Reynolds number and approximately equal to 0.008 over the Reynolds number range examined. The measurements indicate the existence of an apparent downstrea c nvection of the pressure field at a rate which is approximately the mean discharge velocity of the pipe flow. The pressure field in addition to being convected was also dispersed. Estimates of the scale of the turbulence were obtained. A limited statistical analysis of the pressure time history indicates that the amplitude variation is Gaussian. (Author).
Wall-pressure Fluctuations and Pressure-velocity Correlations in a Turbulent Boundary Layer
Author: John S. Serafini
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 88
Book Description
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.
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 88
Book Description
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.
Wall Pressure Fluctuations in Boundary Layer Flow and Response of Simple Structures to Random Pressure Fields
Author: M. K. Bull
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 300
Book Description
Results are presented for r.m.s. pressure, spectra and broad and narrow band space-time correlations of the wall pressure field of a turbulent boundary layer and of correlations between wall pressure and longitudinal velocity fluctuations. Preliminary results of some similar measurements in the laminar-turbulent transition region of a boundary layer are also given. The report also includes results of measurements of panel response to turbulent boundary layer, jet and siren excitation.
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 300
Book Description
Results are presented for r.m.s. pressure, spectra and broad and narrow band space-time correlations of the wall pressure field of a turbulent boundary layer and of correlations between wall pressure and longitudinal velocity fluctuations. Preliminary results of some similar measurements in the laminar-turbulent transition region of a boundary layer are also given. The report also includes results of measurements of panel response to turbulent boundary layer, jet and siren excitation.
Turbulent Pressure Correlation in Pipe Flow: Relation Between Time and Space
Author: Samuel Joseph Cowan
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
Book Description
Measurements of the Correlation Between the Fluctuating Velocities and the Fluctuating Wall Pressure in a Thick Turbulent Boundary Layer
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Measurements of the Fluctuating Pressure at the Wall Beneath a Thick Turbulent Boundary Layer
Author: W. W. Willmarth, C. E. Wooldridge
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
Book Description
Properties of the Fluctuating Wall Pressure Field of a Turbulent Boundary Layer
Author: M. K. Bull
Publisher:
ISBN:
Category : Turbulent boundary layer
Languages : en
Pages : 34
Book Description
The results of measurements of various statistical properties of the fluctuating wall-pressure field associated with turbulent subsonic boundary layer flow in conditions covering a range of values of boundary layer thickness and flow speed are given. The measured quantities include overall rms pressures, frequency spectra, and longitudinal and lateral space-time correlations in both broad and narrow frequency bands. Some experimental values of space-time correlation between wall-pressure fluctuations and turbulent velocity fluctautions at various positions in the boundary layer are also presented. These experimental results and some of their implications on the structure of the wallpressure field and the nature of its convection and decay are discussed. (Author).
Publisher:
ISBN:
Category : Turbulent boundary layer
Languages : en
Pages : 34
Book Description
The results of measurements of various statistical properties of the fluctuating wall-pressure field associated with turbulent subsonic boundary layer flow in conditions covering a range of values of boundary layer thickness and flow speed are given. The measured quantities include overall rms pressures, frequency spectra, and longitudinal and lateral space-time correlations in both broad and narrow frequency bands. Some experimental values of space-time correlation between wall-pressure fluctuations and turbulent velocity fluctautions at various positions in the boundary layer are also presented. These experimental results and some of their implications on the structure of the wallpressure field and the nature of its convection and decay are discussed. (Author).
NASA Technical Report
Author:
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 722
Book Description
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 722
Book Description
Measurements of the Corelation Between the Fluctuating Velocities and the Fluctuating Wall Pressure in a Thick Turbulent Boundary Layer
Author: C. E. Wooldridge
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
Book Description
WALL PRESSURE FLUCTUATIONS BENEATH AN AXIALLY SUMMERTRIC TURBULEN BOUNDARY LAYER ON A CYLINDER
Author: CHI-SHENG YANG, WILLIAM W. WILLMARTH
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
Book Description