초록 ▼

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 pro

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.

대표청구항 ▼

A dualcavitating hydrofoil for providing dynamic lift to a marine vehicle, comprising: an upper surface having an aft upper segment; a lower surface wherein said upper and lower surfaces define a profile of said dualcavitating hydrofoil; and boundary layer circulation control means for generating a

A dualcavitating hydrofoil for providing dynamic lift to a marine vehicle, comprising: an upper surface having an aft upper segment; a lower surface wherein said upper and lower surfaces define a profile of said dualcavitating hydrofoil; and boundary layer circulation control means for generating a flow over said aft upper segment such that boundary layer separation over said upper surface is avoided during normal subcavitating operation; wherein said upper and lower surfaces function to provide a lift force sufficient to lift the marine vehicle above a water surface, said upper surface being adapted to efficiently produce said lift force during normal subcavitating operation at subcavitating speeds wherein said upper and lower surfaces are substantially fully wetted, and said profile being adapted to efficiently produce said lift force above normal subcavitating speeds wherein at least a portion of said upper surface is enveloped within a cavity generated by said profile and substantially all of said lower surface is wetted.