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• W654502384 abstract "Oil prices have recently soared with the result that energy saving of ships is keenly required from the stand points of ship economy and environmental energy conservation. To date, improvements of ship performance have been made in propulsion devices and also in hull form refinement. It is a fact that there are some technologies which can save large amount of energy but few of them are justified economically or maintenance ability. In order to provide a solution for this problem, review of classical concepts of hydrodynamic principles such as Magnus effect, boundary layer control and so on. As a result, Column-type Circular Cylinder Propulsion Assistance System (C-PAS) was proposed for large vessels. The concept of C-PAS is to utilize commonly equipped column structures of dodger support as a sail by applying boundary layer control using air-suction. Usage of fans for supplying air into engine room is in the scope of our development to minimize additional energy for the new device in order to increase the economical value. ABSTRACT: Referring to the recent soared oil prices and the environmental requirements for saving energy, the requirement of ship energy saving has become a keen subject. Review of classical concepts of hydrodynamic principles such as Magnus effect, boundary layer control and so on. As a result, Column-type Circular Cylinder Propulsion Assistance System (C-PAS) was proposed for large vessels utilizing existing column structures of dodger support applying boundary layer control by air-suction. As a part of basic study, a preliminary design was made which is composed of a circular cylinder with a fin and air suction panel. Flow visualization by smoke test was conducted at a two dimensional wind-tunnel and the results showed the clear effect of air suction, permeability of suction panel. In this study, X-type hot-wire measurements was conducted to measure flow velocity and direction more in detail. The analyses and comparison with the results by a spherical probe indicated clearly the change of flow field around the circular body by air suction. The estimated lift by C-PAS implies a possibility of this system for assisting ship propulsion." @default.
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• W654502384 date "2006-07-14" @default.
• W654502384 modified "2023-09-23" @default.
• W654502384 title "Wind tunnel study of column-type circular cylinder propulsion assistance system (C-PAS) for Ships" @default.
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