PROPELLER TIME-DEPENDENT FORCES DUE TO NON-UNIFORM FLOW

The ability to accurately predict the magnitude and phase of the time-dependent forces and moments generated by the blades of a propulsor is important due to the possible vibrations and/or radiated sound. This Report considers the time-dependent thrust response of an open propeller due to operating in both spatially and temporarily varying flows. The measurements were carried out in a water tunnel, the time-dependent thrust generated by a series of propellers operating first in various spatially non-uniform inflows and then in various turbulent inflows. The analytical investigation considered several different methods for predicting the propeller response to both spatial and temporal variations in the inflow. A correlation of the experimental and analytical results indicates that the unsteady two-dimensional theory, with proper corrections, predicts the propeller time-dependent thrust more accurately than the unsteady, three-dimensional, lifting-surface theory for response to spatial variations. For response to temporal variations in the inflow, the analytical method, which considers blade-to-blade correlations, predicts the propeller time-dependent thrust response more accurately than the method without the blade-to-blade correlations.

  • Supplemental Notes:
    • This report is available in microfiche form.
  • Corporate Authors:

    Pennsylvania State University, University Park

    Applied Research Laboratory
    University Park, PA  USA  16802
  • Authors:
    • Thompson, D E
  • Publication Date: 1976-5

Media Info

  • Features: References;
  • Pagination: 226 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00172954
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: No. TM 76-48
  • Files: TRIS
  • Created Date: Apr 12 1978 12:00AM