Noise from Tip Vortex and Bubble Cavitation

Abstract

This paper presents results from experiments designed to study the sound from different types of propeller cavitation. The propellers used in the tests produced tip vortex and travelling bubble cavitation. The spectral content, directivity, and waveform of the far-field sound were measured, in essentially free-field conditions up to 100 kHz. These data were then correlated with information about the cavity dynamics, obtained from visual observations. Vibrational modes on the tip vortex cavities produced sound at characteristic frequencies. Bubble cavitation by itself produced very broadband noise, and strongly affected the vortex cavitation noise mechanisms if the free bubbles entered the tip vortices. The noise from both kinds of cavitation was directional. Keywords: Propeller, Cavitation, Noise, Spectra, Directivity, Waveform, Canada.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1990
Accession Number
ADA221962

Entities

People

  • Neil C. Sponagle

Organizations

  • Defence Research and Development Canada

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Sensors

DTIC Thesaurus Topics

  • Acoustic Measurement
  • Acoustic Phenomena
  • Acoustic Propagation
  • Acoustic Properties
  • Acoustic Waves
  • Acoustics
  • Bandwidth
  • Cavitation Noise
  • Cross Correlation
  • Directional
  • Far Field
  • Field Conditions
  • Free Field
  • Frequency
  • Frequency Bands
  • Noise
  • Propellers

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Acoustics.
  • Aerodynamics.