Low underwater radiated noise propellers design

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Customer: ARMON

Related services: CFD SIMULATIONS, SILENT PROPELLERS, PROPELLER OPTIMIZED DESIGN

Scope of work:

  • Viscous CFD ship resistance calculation
  • Nominal wake calculation
  • Self-propulsion computation
  • Propeller geometry design, adapted to vessel operational profile, and with special attention to noise and cavitation
  • Production drawings

Results:

Due to the specific requirements of oceanographic vessels, propellers must comply with extremely severe noise restrictions. ICES 209 guidelines for acceptable upper thresholds of radiated noise for newly built fishery survey vessels, were to be regarded in the design; apart from avoiding cavitation, special anti-singing edge geometry was used in order to avoid the apparition of singing phenomena at the blade.

Among other effects, low noise design gives also a lower vibration level and a better comfort for the crew.

 

The main particulars of the vessel are:

Loa = 52.8 m

B = 12.8 m

Main engine power = 2100 kW

 

For the propeller, main characteristics are:

Type : FPP

D = 3200 mm

Number of blades = 5

 

This propeller was approved by ABS.

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