Abstract
To meet the increasing energy-saving demand due to the rapid rise in fuel oil costs, a rudder bulb energy-saving device was developed. Compared with the present energy-saving devices of the rudder bulbs, the diameter was increase to 0.3 times of the propeller diameter and the rudder bulb was combined with the propeller hub to maximize its performance when located in the complex flow field around the stern, considering the hydrodynamic factors which govern the energy-saving effect. A number of model numerical predictions were carried out and the results indicated that the energy-saving for rudder bulb is around 2.03%. This paper describes the principle and procedure for the optimization design and energy saving effect prediction of the new type rudder bulb.
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