Accession Number : AD0022779


Title :   THREE-DIMENSIONAL VORTEX-LINE THEORY OF A HYDROFOIL OPERATING IN WATER OF LARGE DEPTH. PART 1. THE WAVE DRAG OF A SINGLE HYDROFOIL WITH PRESCRIBED LIFT-DISTRIBUTION


Corporate Author : HYDROFOIL CORP ANNAPOLIS MD


Personal Author(s) : Meyer, R X


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/022779.pdf


Report Date : 07 Feb 1951


Pagination or Media Count : 41


Abstract : The bound-vortex drag was computed for different lift distributions of a single, straight bound-vortex line which, in conformance with Prandtl's airplane wing theory, replaced the hydrofoil. The bound-vortex line was parallel to the undisturbed interface and approximately at the centers of lift of the wing sections of the hydrofoil. The analysis neglected viscous forces and assumed irrotational fluid motion everywhere outside the bound vortex and trailing vortex sheet. Equations give the drag for cases of very short, very long, and arbitrary span. A curve shows the drag calculated for Froude number (NFr) of 10.85 and a rectangular lift distribution. The arbitrary span equations include the cases of very large and very small NFr's. The problem of the optimum lift distribution of a hydrofoil is qualitatively discussed.


Descriptors :   *HYDROFOILS , *NAVAL ARCHITECTURE , *TRAILING VORTICES , RECTANGULAR BODIES , DRAG , WINGS , LIFT , FROUDE NUMBER , SHEETS , DISTRIBUTION , OPTIMIZATION , EQUATIONS


Subject Categories : Marine Engineering


Distribution Statement : APPROVED FOR PUBLIC RELEASE