Effect of Pressure Gradient on Cavitation Iception from an Isolated Surface Roughness

Abstract

An experimental investigation was carried out for the case of different triangular protrusions, to study the cavitation characteristics in the presence of a pressure gradient. The shape factor and wake parameter were calculated from the pressure gradient and the boundary layer parameters with the assistance of computer programs based on the method of E. Truckenbrodt. Limited cavitation numbers were obtained visually for the flow with different cases of zero, favorable and unfavorable pressure gradient. For the case of zero pressure gradient, a power law relationship was established between the limited cavitation number and the relative height and Reynold's number based on boundary layer thickness. In addition, the comparison of the power law obtained by the present investigation with that by Holl was carried out. Furthermore, a development of the characteristic velocity theory was made semi-empirically. For a flow with pressure gradient, the power law relationship was extended to include the influence of shape factor.

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Document Details

Document Type
Technical Report
Publication Date
Oct 18, 1982
Accession Number
ADA129998

Entities

People

  • Masaru Tada

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Layer
  • Computer Programs
  • Dynamic Pressure
  • Engineering
  • Experimental Data
  • Fluid Flow
  • Gases
  • Liquids
  • Mechanical Engineering
  • Pressure Distribution
  • Pressure Gradients
  • Pressure Measurement
  • Standards
  • Static Pressure
  • Surface Roughness
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Underwater engineering and Marine Technology.