Physical and theoretical modeling of surface-piercing hydrofoils for a high-speed unmanned surface vessel
The objective of this work is to investigate the performance of two pairs of negative dihedral surface-piercing (SP) hydrofoils designed especially for an unmanned surface vessel with a top speed of 120 knots in sea state two. Physical modeling of a 1/6-scaled model of the SP hydrofoil was conducted...
| Main Authors: | , |
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| Other Authors: | , |
| Format: | Conference Object |
| Language: | English |
| Published: |
ASME
2012
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| Subjects: | |
| Online Access: | http://hdl.handle.net/11567/788673 http://www.scopus.com/inward/record.url?eid=2-s2.0-84884478476&partnerID=40&md5=e3bdbc3583345c9eca92e0502991238c |
| Summary: | The objective of this work is to investigate the performance of two pairs of negative dihedral surface-piercing (SP) hydrofoils designed especially for an unmanned surface vessel with a top speed of 120 knots in sea state two. Physical modeling of a 1/6-scaled model of the SP hydrofoil was conducted at the free-surface cavitation tunnel at the Technical University of Berlin (TUB). The SP hydrofoil feature a new type of super-cavitating profile with an annex tapered trailing edge to achieve good efficiencies in foil born conditions (60-120 knots, super-cavitating/super-ventilated regimes), as well as at take-off speeds (25-40 knots, wetted and/or partial-cavitating regimes). Preliminary results showed interesting anomalies in the trends of the measured forces with respect to the cavitation number and angle of attack for a wide range of inflow speeds. Details of the experimental study are presented along with numerical predictions obtained using finite volume RANSE solver with a volume of fluid technique to allow for a mixture flow with air/vapor and water phases. Explanation of the anomalies in the hydrodynamic performance is given. Copyright © 2012 by ASME. |
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