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http://dx.doi.org/10.2478/IJNAOE-2013-0185

Experimental investigation of frictional resistance reduction with air layer on the hull bottom of a ship  

Jang, Jinho (SSMB (Samsung Ship Model Basin), Marine Research Institute, Samsung Heavy Industries Co., Ltd.)
Choi, Soon Ho (SSMB (Samsung Ship Model Basin), Marine Research Institute, Samsung Heavy Industries Co., Ltd.)
Ahn, Sung-Mok (SSMB (Samsung Ship Model Basin), Marine Research Institute, Samsung Heavy Industries Co., Ltd.)
Kim, Booki (SSMB (Samsung Ship Model Basin), Marine Research Institute, Samsung Heavy Industries Co., Ltd.)
Seo, Jong Soo (SSMB (Samsung Ship Model Basin), Marine Research Institute, Samsung Heavy Industries Co., Ltd.)
Publication Information
International Journal of Naval Architecture and Ocean Engineering / v.6, no.2, 2014 , pp. 363-379 More about this Journal
Abstract
In an effort to cope with recent high oil price and global warming, developments of air lubricated ships have been pursued to reduce greenhouse gas emissions and to save fuel costs by reducing the frictional resistance. In this study, reduction in the frictional resistance by air lubrication with air layers generated on the lower surface of a flat plate was investigated experimentally in the large water tunnel of SSMB. The generated air layers were observed, and changes in the local frictional drag were measured at various flow rates of injected air. The results indicated that air lubrication with air layers might be useful in reducing the frictional resistance at specific conditions of air injection. Accordingly, resistance and self-propulsion tests for a 66K DWT bulk carrier were carried out in the towing tank of SSMB to estimate the expected net power savings.
Keywords
Greenhouse gas emissions; Fuel costs; Frictional resistance; Air lubrication; Air layer; Air injection; Net power savings;
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