Accession Number : AD0264278

Title :   SOME MEASUREMENTS OF LONGITUDINAL SPACE-TIME CORRELATIONS OF WALL PRESSURE FLUCTUATIONS IN TURBULENT PIPE FLOW

Corporate Author : CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH

Personal Author(s) : VONWINKLE,WILLIAM ANTON

Report Date : SEP 1961

Pagination or Media Count : 1

Abstract : 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)

Descriptors :   *ACOUSTICS, *TURBULENCE, *TURBULENT BOUNDARY LAYER, EXPERIMENTAL DATA, FLUID FLOW, FLUID MECHANICS, MEASUREMENT, NOISE, PIPES, PRESSURE, STATISTICAL ANALYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE