Journal
OCEAN ENGINEERING
Volume 95, Issue -, Pages 183-194Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2014.11.019
Keywords
Ship; Drag reduction; Hydrofoil; Multiphase flow; Bubble
Funding
- New Energy and Industrial Technology Development Organization (NEDO) of Japan [08 B 36002]
- JSPS KAKENHI [24236033]
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We have developed a new power-saving device to reduce the drag of a ship's hull using small bubbles. The device reduces the energy required for bubble generation. The device, which consists of angled hydrofoils with air introducers, uses the low-pressure region produced above the hydrofoil as the ship moves forward to drive atmospheric air into the water. We describe the device principles obtained from simple fluid dynamic theory, and, through experiments performed in a small towing tank, show the fundamental air entrainment and bubble generation processes for the flow behavior around a hydrofoil beneath a free surface. We also present a semi-empirical scaling process for practical application to full-size ships to estimate the net drag reduction achieved by this device. Finally, the results of a series of full-scale tests are reported and show that, with correct operation, our device can produce a net power saving of 5-15% for ships. (C) 2014 The Authors. Published by Elsevier Ltd.
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