NDLI: Experimental investigation on the drag reducing efficiency of the outer-layer vertical blades

Content Provider	Springer Nature Link
Author	Park, Hyun An, Nam Hyun Hutchins, Nicholas Choi, Kwing So Chun, Ho Hwan Lee, Inwon
Copyright Year	2011
Abstract	An experimental assessment has been made of the drag reducing efficiency of the outer-layer vertical blades, which were first devised by Hutchins and Choi (Proceedings of ASME FEDSM’02 2002 ASME Fluids Engineering Division Summer Meeting, Montreal) and Hutchins (An investigation of larger-scale coherent structures in fully developed turbulent boundary layers, Hutchins N (2003), PhD thesis, University of Nottingham). The reported drag reduction efficiency, which was as much as 30%, was quantified only in terms of the reduction in the local skin-friction coefficient. The assessment of the drag reducing efficiency did not take the side effects of the inclusion of the blades into considerations. Those effects are the increase in the wetted surface area and the flow disturbances due to the presence of the blades. In the present study, a series of drag force measurements in towing tank has been performed toward the assessments of the total drag reduction efficiency of the outer-layer vertical blades. It was found that for the case of h 4.0 × z 4.0 (h/δ = 1.04), the outer-layer vertical blades array achieved about 9.6% drag reduction without considering the increase in the wetted surface area. A proper scaling method to give collapsed plot of drag reduction efficiency C F/C F0 was attempted, but the correlation remained limited. Of the two scaling methods, the outer scaling is found to be relevant one.
Starting Page	390
Ending Page	401
Page Count	12
File Format	PDF
ISSN	09484280
Journal	Journal of Marine Science and Technology
Volume Number	16
Issue Number	4
e-ISSN	14378213
Language	English
Publisher	Springer Japan
Publisher Date	2011-08-11
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Flow control Drag reduction Turbulent boundary layer Outer-layer vertical blades Engineering Fluid Dynamics Automotive Engineering Mechanical Engineering Engineering Design Offshore Engineering
Content Type	Text
Resource Type	Article
Subject	Oceanography Ocean Engineering Mechanics of Materials Mechanical Engineering

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Acknowledgements

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Acknowledgements

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