Cavitation on hydrofoil

See also this video for a ship propeller cavitation experiment:    • Propeller cavitation experiment  

Experiment carried out at the Cavitation Laboratory at Marintek, Trondheim, Norway.

Link to similar experiment done in the same tunnel with a propeller:

   • Propeller cavitation experiment  

A model hydrofoil is submerged into the closed-loop cavitation tunnel, and exposed to moving water to produce cavitation. The water is moved by a ~2m diameter impeller powered by a 1.2 MW electric motor. The cavitation tunnel has a max speed of 18 m/s.

In this experiment, the water is accelerated from 0 m/s to 8 m/s. It is pumped through a flow laminator and a nozzle to produce the top speed of 8 m/s (15.6 knots).

Towards the end of the clip, tunnel pressure is reduced to 23 kPa to produce extreme cavitation. The foil is mounted with 6 degree pitch, and has a projected area of 0.1208 m^2.

The foil produced lift force of 2208 N and drag 147 N with a tunnel pressure of 83 kPa (7.8 m/s) and slight cavitation. Lift was reduced to 2182 N and drag increased to 177 N when the pressure was reduced to 23 kPa. Same fluid speed.