Experimental measurements were made of the force characteristics of
a naturally ventilated hydrofoil of finite span submerged below a free surface
and equipped with a jet flap. Jet momentum coefficients up to 0.35
were attained. The increment of lift associated with action of the jet
flap was primarily dependent on the jet momentum coefficient and the flap
angle. Measured lift increments were considerably less than those calculated
by Ho from linearized theory for two-dimensional foils and zero cavitation
number. Thrust recovery was dependent on the jet momentum coefficient and
the flap angle, decreasing as these parameters were increased. In. all cases
thrust recovery was greater than the horizontal component of the jet reaction.
A brief series of tests was also conducted with a restrained, jet
flap foil moving through a regular wave train. For reduced frequencies,
based on the full chord, up to 0.7, the oscillatory force characteristics
were essentially the same as for the foil without the jet flap for otherwise
Wetzel, J. M.; Foerster, K. E..
Further Experiments on a Jet Flap Hydrofoil in Ventilated Flow.
St. Anthony Falls Laboratory.
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