The physical form of a buoyancy-propelled-test-body facility and some
preliminary test results are described. The facility is a 26-meter-high,
1.067-meter-diameter standpipe which can be filled with water or other
liquid. An axisymmetric body rises by buoyancy and is guided up the center
on a taut restraining cable. Sensors for measurement of velocity and displacement
are incorporated into the guide cable. The standpipe is also
equipped to provide pull-down and release of the test body, initial acceleration, and stopping. The confined space of a standpipe within
the laboratory permits controlled use of drag reducing polymer in the test
liquid and nucleus removal to reduce cavitation.
The minimal quantity of fluid in motion resulting from this configuration
and consequent low level of background noise allow surface pressure fluctuations
and radiated noise to be measured. Preliminary measurements of surface
pressure fluctuations are reported. The potential of this apparatus for
future use is outlined.
A Buoyancy-Propelled-Test-Body Laboratory Facility.
St. Anthony Falls Hydraulic Laboratory.
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