- Propulsor
A propulsor is a mechanical device that gives propulsion.
The word is commonly used in the marine vernacular, and implies a mechanical assembly that is more complicated than a
propeller . TheKort nozzle andPump-jet are examples.A propulsor, as can be seen in the accompanying picture has a shroud, which cuts down on blade-tip cavitation and radiated noise. It also has a rotor element and a stator. The stator concentrates the thrust in axial direction and reduces energy wasted in the tangential flow (therefore eliminating torque on the hull). The number of blades in the rotor & stator will typically be odd-numbered, and different prime numbers to avoid
standing wave s. The blades in the rotor or the stator may be angled to further reduce noise. The physical design and layout is very much similar to a single stageAxial-flow compressor .ee also
*
Z-drive <=>L-drive
*Voith-Schneider
*Axial-flow_compressor External links
* [http://www.rolls-royce.com/marine/products/propulsion/default.jsp Rolls-Royce Marine]
* [http://www.schottel.de/index_e.htm Schottel marine propulsion]
* [http://www.flowserve.com/vgnfiles/Files/Literature/ProductLiterature/Pumps/pss-90-8.1-e.pdf Pleuger Propulsion]
* [http://www.voithturbo.de/vt_en_pua_marine_vspropeller.htm Voith Schneider® propulsors]
* [http://marinepropulsion.net/kort/nozzle.htm Kort nozzles]
* [http://www.fairplay-tugs.com/main/faq-all.php Tug boat FAQ]
Wikimedia Foundation. 2010.