Experiments on a Jet Flap in Supercavitating Flow

Experiments on a fully-cavitated, flat-plate hydrofoil equipped with a pure jet flap were conducted in the free-jet water tunnel at the St. Anthony Falls Hydraulic Laboratory. The foils were of 2-in. and 2.75-in. chord and were tested in 6-in., 10-in., and l4-in. wide free jets. Data were obtained on the increments in lift, drag, and moment coefficients and on the shift in center of pressure as a function of jet momentum coefficient C_j, cavitation number, and other variables.