Abstract
The results of experimental and theoretical investigations on a supercavitating flat plate with an oscillating flap at zero cavitation number are presented. The experiment was carried out in a vertical free-jet water tunnel using 3-in. chord and 2-in. chord flat-plate hydrofoils, both having flap-chord ratios of 0.29. Various relative locations of the free surfaces were used and reduced frequency range of zero to four was covered. Amplitude and phase angle of lift, drag, and moment as well as the surface wave speed were measured. The problem was also solved analytically by means of a first-order perturbation theory and the results were compared with the experimental data.
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