NNT ® 02-Mar-2015 08:36

Ruddler Propeller and Hull Interaction


Year: 2000
Language: english
Author: Claus D. Simonsen
Publisher: Technical University of Denmark. Department of Naval Architecture and Offshore Engineering, ISH
ISBN: 8789502272
Format: PDF
Quality: eBook
Pages count: 236
Description: The flow field behind a ship in motion is disturbed by pressure and velocity fluctuations induced from the hull. Consequently, a propeller working behind the ship experiences a highly inhomogeneous inflow. This causes a varying load on the propeller blade during one revolution, resulting in a local pressure drop around the blade.
Depending on the operation conditions, e.g.,submergence of the propeller shaft or rotational speed, the pressure sags below vapour pressure and cavitation, i.e.,vapour pockets in the liquid, can be observed at the propeller. When again entering high pressure regions, the cavities collapse extremely rapidly and may cause noise and vibration, transferred to the ship‟s hull, and causing erosion on the propeller or the rudder.
 
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