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J. Ocean Eng. Technol. > Volume 26(5); 2012 > Article
J. Ocean Eng. Technol. 2012;26(5):1-4.    
DOI: https://doi.org/10.5574/KSOE.2012.26.5.001   

A study on the Development of Energy-Saving Device "Crown Duct"
Lee Kwi-Joo,An Jung-Sun,Yang Sun-Hee
Dept. of Naval Architecture & Ocean Engineering Chosun University,Dept. of Naval Architecture & Ocean Engineering Chosun University,Basic Planning Department SPP Shipbuilding Co. Ltd.
Copyright © 2012 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Key Words: Energy-saving device, Stator, Dual functioned energy saving device, Crown duct, Towing tank
Abstract
A energy saving device "Crown duct" has been developed and its efficiency gain has been verified experimentally in the towing tank of SSPA. The preswirl stator is well known as one of energy saving devices, which recovering the rotational energy of propeller slipstream. Crown duct has two functions of recovers the rotational energy by three blades on top of duct and of flow concentration by semi-duct. The model tests showed 4.4% efficiency gain with Crown Duct at full load condition and 6.9% at ballast condition compared with the bare hull ones for the middle class tanker.


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