The Use of Distributed Roughness for Scaling Cavitation Inception.

Abstract

Cavitation inception observations on a family of axisymmetric models were made in the 1.21 m water tunnel at the Applied Reserach Laboratory. Inception data were obtained on Schiebe headforms having diameters of 203.2 mm, 50.8 mm and 25.4 mm. The Schiebe headform has a C(pmin) = -0.75 and does not experience a separated boundary layer. Initially, cavitation inception data were obtained with no added roughness on the models. Then a distributed roughness of silicon carbide was glued to the nose of the two smaller models and additional cavitation inception data were obtained. Travelling-bubble cavitation was the type of cavitation observed near inception. Results show that it is possible to use a distributed roughness to increase the cavitation inception index to the indices found at higher Reynolds numbers. However the size and location of the roughness are very critical and the basic mechanisms which control this process need further investigation. This paper was presented at the 19th American Towing Tank Conference held in Ann Arbor, Michigan in July 1980. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Aug 21, 1980
Accession Number
ADA096769

Entities

People

  • J. W. Holl
  • Michael L. Billet

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Axisymmetric
  • Boundary Layer
  • Boundary Layer Transition
  • Engineering
  • Free Stream
  • Model Basins
  • Model Tests
  • Models
  • Navy
  • New York
  • Research Facilities
  • Reynolds Number
  • Ship Model Basins
  • Silicon Carbide
  • Tunnels
  • Universities
  • Water Tunnels

Readers

  • Academic Conference Management
  • Fluid Mechanics and Fluid Dynamics.
  • Underwater engineering and Marine Technology.