This final technical report describes a research program carried out on two major problems in hydroacoustics; namely 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. The four main reports deal with the following main tasks of the research: development of signal analysis techniques that permit accurate estimates of the low wavenumber portion of the wavenumber-frequency pressure spectrum; measurements of the pressure spectrum and comparison of experiment with a theoretical wave guide model; 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; and measurement of the spectral characteristics and source distribution of cavitation noise in tip vortices in steady and non-steady flow. Experimental research on turbulent boundary layer pressure fluctuations was carried out in two facilities: a low noise recirculating water tunnel and a buoyant rising body facility. Refs.
|Title of host publication
|Project Report - University of Minnesota, St. Anthony Falls Hydraulic Laboratory
|Published - Apr 1987