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Ship Powering

Resistance and self-propulsion tests

Measurements of resistance and propulsive factors of displacement hulls, high-speed marine vehicles, barges and barge trains in deep and shallow water.

Prediction of full-scale powering performance and attainable speed.


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Resistance and self-propulsion tests

Flow measurements and visualization

Streamline paint tests: Analysis of the flow, alignment of bilge keels and appendages.
Flow visualization with tufts: Analysis of the flow in the stern, detection of flow separation.
Hull pressure measurements: Pressure distribution on the hull.
3D nominal wake measurements: Data for wake-adapted propeller design, assessment of propeller induced vibrations.
Wave pattern and wake-wash measurements: Analysis of the wavemaking of the ship and data for its wave resistance reduction; Estimation of the impact of a moving ship on other floating objects and coastal structures.

 

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Tufts visualization
Wake distribution

 

 


Paint streamlines visualization

Propulsor tests

Open water tests in towing tanks and cavitation tunnel for determining the hydrodynamic characteristics of propellers.
Experimental observations and measurements of cavitation inception and erosion, propeller induced shaft forces and pressures on the hull.
Testing of unconventional propulsors - ducted propellers, water jets, flow-equalizing devices, etc.
Hydroacoustic tests.

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Propulsor tests

Computer aided analysis and optimum design of propulsors

Design of optimum propellers based on own systematic test results, including high-speed and supercavitating propellers in oblique flow.
Computer aided design of wake-adapted propellers based on lifting surface theory.
Numerical prediction of propeller induced unsteady forces and hull pressures.
Propeller strength calculations.

Computer aided analysis

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Optimum design of propulsors

 



Powering performance analysis and improvement

BSHC offers to ship designers, owners and operators consulting on the powering performance of ships using:

•  Validated methods for estimation of ship resistance and propulsion factors based on systematic and random empirical data;

•  Its abundant experimental data base comprising more 400 hull forms and 600 propellers;

•  The knowledge and expertise of the staff experienced in implementing various projects throughout the years.

On the basis of model test data, observations of the flow around the hull, analysis of historic data, CFD tools and the "art of design" of experienced experts hydrodynamic hull form design is carried out at the initial design stages or improvement of the hydrodynamic performance of existing ships is suggested.

Concept exploration models

Starting from, and not restricting to the hydrodynamic performance of the ship, concept exploration models and conceptual design tools have been developed for a variety of ship types, including sea-going and river-going containerships, SES, planing catamarans.

Full-scale trial analysis

BSHC has a team for full-scale trial analysis including survey of underwater hull and propeller fouling and corrosion, measurement data acquisition and processing, data analysis and model tests validation.

 

 


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Last updated 25 February 2010   

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