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.
- This report is available in microfiche form.
Pennsylvania State University, University ParkApplied Research Laboratory
University Park, PA United States 16802
- Thompson, D E
- Publication Date: 1976-5
- Features: References;
- Pagination: 226 p.
- TRT Terms: Force; Nonuniform flow; Propellers; Thrust
- Old TRIS Terms: Propeller forces; Propeller thrust
- Subject Areas: Marine Transportation; Vehicles and Equipment;
- 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