In an experimental investigation in a cavitation tunnel blade force measurements, cavitation observations, and measurements of hull pressure fluctuations have been performed in 4 systematically-varied wake fields. The primary difference in the wake fields lies in the velocity gradients of the circumferential inflow in the upper half of the propeller disc. The tests were performed on 2 propellers having different amounts of skew.

The most important result proved to be that small velocity gradients had an extremely beneficial effect on the hull pressure fluctuations induced on the shell plating of the propeller. The alternating loads on the individual blades, on the other hand, increased with increasing velocity gradient. A larger amount of skew proved to have a favorable effect on both cavitations cavitation and hull pressure fluctuations.

This content is only available via PDF.
You can access this article if you purchase or spend a download.