Annual Report 2004

The annual report gives a concise description of last year's activities.

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Cavitation tunnel data:

• Height between center lines: 10 metres
• Width between center lines: 22.22 metres
• Contraction area ratio: 6.25
• Diameter of working section: 1.20 metre
• Length of working section: 2.08 metres
• Type of working section: Closed throat
• Maximum water velocity: 18 m/sec.
• Maximum propeller RPM: 3000
• Propeller motor power: 50 KW
• Maximum working pressure: 6.0 atm.abs.
• Minimum working pressure: 0.1 atm.abs./sv~0.2
• Impeller motor power: 1150 KW
• Honeycomb for flow straightening

Test activities

• Open water tests with propeller (and duct) in axial or oblique flow
• Behind hull condition with single, twin or triple screw installations
• Azimuth thrusters
• Z-drive installations
• Underwater vehicles (submarines, ROV's etc.)
• Hydrofoils with or without remotely controlled flaps

Measurements and observations

• Cavitation observation (Documentation by sketches, photos and video recordi07.11.2005nt technique
• Measurements of propeller induced pressure fluctuations in the aftbody
• Measurements of propeller induced noise
• Six-component force measurements

MARINTEK's standard procedure for propeller cavitation testing in behind condition, is to use dummy aftbody model and simulation of estimated full scale wake distribution, based on the measured wake distribution in the towing tank.