An Experiment Concerning Partly Closed Cavities Behind a Surface-Piercing Rod

Abstract

The post-base ventilation state, as described by P. Thomsen in TRG, Inc., report 156 SR-2, did not occur in the free surface water tunnel in a natural manner. It could be obtained by partial closure of the gap in the water surface with a plate. Removal of this plate resulted always in a restoration of the original base ventilated state if the velocity was high enough. It seems reasonable to suppose that in the case of A. D. Hay's experiments (Flow About Semi-Submerged Cylinders of Finite Length, Princeton U., 1 October 1947) such a plate or other spray cover near the surface must have been present, which became effective at high velocities, when the spray sheet could make good contact with it. At the transition of the pre-base ventilation state and the base ventilation state, stable cavities did exist which were nearly closed near the water surface, or at a lower point. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1964
Accession Number
AD0430179

Entities

People

  • M. C. Meijer

Organizations

  • California Institute of Technology

Tags

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  • Air Platforms
  • Weapons Technologies

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  • Aeronautical Engineering
  • California
  • Engineering
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  • Fluid Mechanics
  • Froude Number
  • Hydrodynamics
  • Marine Engineering
  • Measurement
  • Military Research
  • Naval Architecture
  • Navy
  • New York
  • Reynolds Number
  • Surface Waters
  • United States
  • Water Tunnels

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  • Marine Hydrodynamics
  • Marine Propulsion Engineering and Naval Architecture
  • Structural Dynamics.