WATER ENTRY AND EXIT OF A FULLY VENTILATED FOIL

The motion of a fully ventilated foil in water of both infinite and finite depth is considered. Part 1 deals with a two- dimensional, thin foil entering vertically into a deep ocean at high speeds. The foil is allowed to have small, time-dependent deformations, and the resulting flow around it is assumed to become fully ventilated. The problem is solved by linearized theory, the solution being divided into two different phases: initial entry and complete entry. The initial entry phase concerns the flow motion in which the foil is only partially submerged, and the complete entry phase concerns that in which the entire length of the foil becomes submerged. The pressure distribution on the foil is determined analytically up to a function of the time variable. The determination of the function depends on the solution of an integral equation. For illustration, the present theory is applied to a flat-plate foil in both uniform and nonuniform motions and to circular-arc foils in uniform motions. Part 2 considers the same foil in a layer of water of finite thickness. Here, the solution is divided into three different phases: the initial entry phase, the complete entry phase, and the exit phase. For the exit phase, the pressure distribution on the foil is explicity determined. The result obtained in this work is intended for use in the design of the partially submerged supercavitating propeller.

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  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  USA  07306-2907
  • Authors:
    • Wang, D P
  • Publication Date: 1977-3

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Filing Info

  • Accession Number: 00152333
  • Record Type: Publication
  • Source Agency: Society of Naval Architects and Marine Engineers
  • Files: TRIS
  • Created Date: Apr 13 1977 12:00AM