PROPELLER SINGING ANALYSIS

Abstract

A theoretical investigation is presented of the phenomenon of singing of moving hydrofoil vanes or blades. The experimentally noted dependence of Strouhal frequency on blade thickness, bound-ARY LAYER THICKNESS AND VIBRATION AMPLITUDE IS TAKEN INTO CONSIDERATION IN FORMULATING AN EXPRESSION FOR THE HYDRODYNAMIC FORCES ACTING ON THE BLADE. The unsteady hydrodynamic forces associated with an oscillating blade are generalized by relinquishing the Kutta condition of boundedness of pressure jump at the blade trailing edge. Curves of frequency and amplitude versus velocity were obtained which bear good qualitative resemblance with available experiment. The effect of trailing edge thickness is also examined and indicates frequency and amplitude effects consistent with experiment. The sound field intensity and distribution is discussed and an estimate obtained. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1961
Accession Number
AD0257424

Entities

People

  • F. Lane
  • L. Arnold
  • S. Slutsky

Tags

DTIC Thesaurus Topics

  • Amplitude
  • Doppler Effect
  • Frequency
  • Frequency Shift
  • Hydrofoils
  • Intensity
  • Motion
  • Physical Properties
  • Pressure Distribution
  • Propellers
  • Thickness
  • Trailing Edges
  • Vibration

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Control Systems Engineering.
  • Theoretical Analysis.