VENTILATION INCEPTION ON A SURFACE-PIERCING DIHEDRAL HYDROFOIL WITH PLANE-FACE WEDGE SECTION
STEVENS INST OF TECH HOBOKEN NJ DAVIDSON LAB
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A surface-piercing, dihedral hydrofoil was tested to investigate the inception and extent of ventilation. The foil of wedge-shaped cross-section and dihedral angle of 30 degrees was shown to ventilage under a number of operating conditions when the speed, draft, and angle of attack were varied. Stable regions of fully attached and fully ventilated flow are defined by ventilation inception boundaries which are shown to depend on the speed and angle of attack and not on the depth of submergence. Expressions for the forces experienced by the foil under these stable flow conditions are derived and are shown in good agreement with the experimental results.
- Marine Engineering