Propeller Time-Dependent Forces Due to Nonuniform Flow.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
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The aability to accurately predict the magnitude and phase of the time-pendent forces and moments generated by the blades of a propulsor is important due to the possible resulting vibrations andor radiated sound. The present thesis considers the time-dependent thrust response of an open propeller due to operating in both spatially and temporally varying flows. The experimental investigation consisted of measuring, in a water tunnel, the time-dependent thrust generated by a series of propellers operating first in various spatially nonuniform inflows and then in various turbulent inflows. The spatial variations were generated by an upstream strut, and the turbulence was generated by square mesh grids placed upstream of the propeller. Three propellers were considered. Measurements were made with each propeller operating over a range of advance ratios for each nonuniform inflow condition considered.
- Marine Engineering
- Fluid Mechanics