Accession Number:

AD0272131

Title:

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

Descriptive Note:

Corporate Author:

NAVY UNDERWATER SOUND LAB NEW LONDON CONN

Personal Author(s):

Report Date:

1961-08-17

Pagination or Media Count:

1.0

Abstract:

Certain measurements were made on some characteristics of the turbulent pressure field at the wall of a cylindrical pipe. In particular, data have been obtained concerning root-mean-square pressure levels, power spectra, longitudinal space-time correlations, and convection velocity over a limited range of Reynolds number. The similarity of these data to data obtained by other investigators working with the turbulent boundary layer is apparent. The root-mean-square pressure levels are proportional to the dynamic pressure and when non-dimensionalized by use of the dynamic pressure are observed to be independent of the Reynolds number and approximately equal to 0.008 over the Reynolds number range examined. This value is of the same order as that obtained for the turbulent boundary layer. Further, th measurements indicate the existence of an apparent downstream convection 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 is also dispersed. A limited st istical analysis of the pressure time history indicat s that the amplitude variation is Gaussian. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE