Dual Cavitating Hydrofoil Structures for Multi-Speed Applications.
Patent, Filed 25 Jun 96, patented 11 Feb 97,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A hydrofoil structures for efficient operation over a wide speed range from subcavitating to supercavitating operation is provided. The dualcavitating hydrofoil overcomes cavitation problems associated with high speed operation of prior art subcavitating hydrofoils by providing a supercavitating profile shape in the lower surface to achieve a supercavitating condition at high speeds and overcomes performance related problems associated with low speed operation and structural problems associated with high speed operation of prior art supercavitating hydrofoils by providing a profile shape having a robust trailing edge that employs the Coanda effect to achieve a smooth flow exit at the trailing edge. The dualcavitating hydrofoil includes upper and lower surfaces defining a profile that includes a tapered section adjacent to and extending aft from the leading edge and a thick curved section adjacent to and extending forward of the trailing edge. The dualcavitating hydrofoil also includes boundary layer circulation control means for generating a flow over the trailing edge region such that boundary layer separation over the upper surface is avoided during normal subcavitating operation.
- Marine Engineering
- Fluid Mechanics