Ships – Hull or hull adjunct employing fluid dynamic forces to... – Having hydrofoil
Patent
1996-06-25
1997-02-11
Swinehart, Edwin L.
Ships
Hull or hull adjunct employing fluid dynamic forces to...
Having hydrofoil
114278, B63B 124
Patent
active
056010478
ABSTRACT:
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.
REFERENCES:
patent: 3065723 (1962-11-01), Tulin
patent: 3077173 (1963-02-01), Lang
patent: 4976349 (1990-12-01), Adkins
patent: 5158251 (1992-10-01), Taylor
Yim, B., "Finite Cavity Cascades With Low-Drag Pressure Distributions," Tsactions of the American Society of Mechanical Engineers, vol. 95, No. 1, Mar. 1973, pp. 8-16.
Englar, Robert J., "Circulation Control For High Lift and Drag Generation on STOL Aircraft," Journal of Aircraft, vol. 12, No. 5, May 1975, pp. 457-463.
Englar, Robert J. and Robert M. Williams, "Design of a Circulation Control Stern Plane for Submarine Applications," Naval Ship Research and Development Center Report ASED-200 (Mar. 1971).
Lang, T. G., "Base-Vented Hydrofoils," U.S. Naval Ordnance Test Station Report 6606 (Oct. 1959).
Borda Gary G.
Swinehart Edwin L.
The United States of America as represented by the Secretary of
LandOfFree
Dualcavitating hydrofoil structures for multi-speed applications does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dualcavitating hydrofoil structures for multi-speed applications, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dualcavitating hydrofoil structures for multi-speed applications will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-335165