Accession Number:

ADA222492

Title:

Measurement of Multiple Blade Rate Unsteady Propeller Forces

Descriptive Note:

Final rept.

Corporate Author:

DAVID TAYLOR RESEARCH CENTER BETHESDA MD

Personal Author(s):

Report Date:

1990-05-01

Pagination or Media Count:

60.0

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.

Subject Categories:

  • Marine Engineering
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE