Accession Number : ADA180312

Title :   Research Program in Hydroacoustics.

Descriptive Note : Final technical rept.,

Corporate Author : MINNESOTA UNIV MINNEAPOLIS ST ANTHONY FALLS HYDRAULIC LAB

Personal Author(s) : Arndt, Roger E ; Higuchi, Hiroshi ; Kaveh, Mostafa ; Lambert, Robert ; Plunkett, Robert

PDF Url : ADA180312

Report Date : Apr 1987

Pagination or Media Count : 157

Abstract : This porgram is concerned with the nature of the low wavenumber characteristics of turbulent boundary layer pressure fluctuations including their relationship with structural vibration, and cavitation noise from tip vortices. There are four major tasks: a) Development of signal analysis techniques that permit accurate estimates of the low wavenumber portion of the wavenumber frequency pressure spectrum. b) Measurements of the pressure spectrum and comparison of experiment with a theoretical wave guide model. c) Determination of the structural response to wall layer pressure fluctuations and the influence of plate vibration on the structure of turbulence within the boundary layer. d) Measurement of the spectral characteristics and source distribution of cavitation noise in tip vortices in steady and nonsteady flow.

Descriptors :   *VORTICES, *UNDERWATER ACOUSTICS, *TURBULENT BOUNDARY LAYER, *CAVITATION, BOUNDARY LAYER, CAVITATION NOISE, COMPARISON, DISTRIBUTION, LAYERS, MODELS, PLATES, PRESSURE, SIGNALS, SOURCES, SPECTRA, STRUCTURAL PROPERTIES, STRUCTURAL RESPONSE, THEORY, TURBULENCE, VARIATIONS, VIBRATION, WALLS, WAVEGUIDES, PRESSURE DISTRIBUTION, ALGORITHMS, WATER TUNNELS, JET FLOW, MATHEMATICAL MODELS, STEADY FLOW, UNSTEADY FLOW, HYDRAULICS

Subject Categories : Fluid Mechanics
      Acoustics
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE