Accession Number : AD0732402

Title :   Measurement of the Boundary-Layer Pressure Fluctuations Associated with Turbulent Air Flow in a Rigid Pipe.

Descriptive Note : Final rept.,

Corporate Author : NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD

Personal Author(s) : DeMetz,Fred C. ; Jorgensen,Donald W.

Report Date : OCT 1971

Pagination or Media Count : 30

Abstract : The report gives the results of an experimental investigation of the pressure fluctuations associated with turbulent flow in a rigid pipe. Measurements were made of the power-spectral and cross-spectral densities of the pressure fluctuations on the pipe wall for fully developed turbulent air flow over a Reynolds number range of approximately 20 to 1. The variation in Reynolds number was achieved by variation in flow velocity. The spectral content of the pressure field was investigated for frequency components from 10 to 10,000 Hz. Special attention was given to obtaining spectral levels for the low-frequency components of the pressure field because power spectral density in the low wave-number region for turbulent pipe flow is still uncertain.

Descriptors :   (*FLUID FLOW, *PIPES), TURBULENCE, PRESSURE, WALLS, BOUNDARY LAYER, VELOCITY, TEST METHODS, STATISTICAL DISTRIBUTIONS

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE