Cavitation on hydrofoil
See also this video for a ship propeller cavitation experiment: https://www.youtube.com/watch?v=mUjxudQX9Wg Experiment carried out at the Cavitation Laboratory at Marintek, Trondheim, Norway. Link to similar experiment done in the same tunnel with a propeller: http://www.youtube.com/watch?v=mUjxudQX9Wg 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.
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