Measurement of Multiple Blade Rate Unsteady Propeller Forces

Abstract

An experimental investigation of unsteady propeller forces was conducted using model propellers operating in idealized axial wakes. Three- bladed propellers were operated behind 3-, 6-, 9- and 12-cycle wake screens generating blade rate and multiple axial wake inflow harmonics. The axial wake distributions were measured using a Pitot tube. Unsteady propeller bearing thrust and torque were measured with an unsteady force dynamometer. Measurements were compared to calculations using unsteady propeller lifting surface theory. Also, Laser Doppler Velocimetry (LDV) was used to measure the unsteady flow field about the propeller. LDV measurements were used to evaluate the effect of the propeller on the incoming wake. Keywords: Marine propellers; Unsteady loads; Bearing forces; Model tests; Propeller blades.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1990
Accession Number
ADA222492

Entities

People

  • Stuart D. Jessup

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Acquisition
  • Boundary Layer
  • Data Acquisition
  • Dynamic Response
  • Flow Fields
  • Fourier Series
  • Geometry
  • Hydrodynamics
  • Laser Beams
  • Marine Propellers
  • Measurement
  • Propeller Blades
  • Test Facilities
  • Turbulent Mixing
  • Two Dimensional
  • Unsteady Flow

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Fluid Dynamics.

Technology Areas

  • Directed Energy