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DOWNWASH DUE TO A FULLY CAVITATED HYDROFOIL BENEATH A FREE SURFACE.
HYDRONAUTICS INC LAUREL MD
Attention is paid to the downwash far downstream of the cavitated hydrofoil. This result should be of use in the estimation of the influence of the forward foil on the rear foil of the hydrofoil craft. Since the point where the downwash is calculated is far from the cavitated hydrofoil, the effect of the detailed shape of the hydrofoil is small. Therefore, for the sake of simplicity, the cavitated hydrofoil under the free surface is assumed to have the form of a simple model made of a vortex line and a uniform source plus a line sink. Due to the linearity of the potential, the downwash due to the vortex and due to the source are dealt with separately. Numerical computations made for the downwash at various downstream and spanwise positions at the same depth as the hydrofoil, and covering a large range of Froude numbers, are given in the form of curves. Author