The Effect of Scale on Propeller Tip-Vortex Cavitation Noise

Abstract

Measurements made long ago of the underwater noise associated with propeller tip-vortex cavitation on a submerged WWII submarine underway at sea, combined with measurements of the noise from a geometrically scaled model of the same submarine running submerged and self propelled in our towing basin, are used to calculate the value of the exponent in McCormick's equation, (sigma (sub rho)/sigma (sub MU))=(Re(sub rho)/Re(sub MU))(exp n) , relating the ratio of full-scale to model cavitations numbers at cavitation inception to the ratio of the Reynolds numbers. The value of n is calculated to be 0.28, which is smaller than the usually assumed values ranging from 0.3 to 0.4. This provides evidence that n is not a constant, but decreases with increasing Reynolds number.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2003
Accession Number
ADA420392

Entities

People

  • Murray Strasberg
  • Young T. Shen

Organizations

  • Naval Surface Warfare Center Carderock Division

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Background Noise
  • Case Studies
  • Cavitation
  • Cavitation Noise
  • Data Acquisition
  • Data Sets
  • Engineering
  • Frequency
  • Frequency Analyzers
  • Frequency Bands
  • Measurement
  • Measuring Instruments
  • Model Tests
  • Noise
  • Propeller Noise
  • Propellers
  • Reynolds Number

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Marine Hydrodynamics