Observation of cavitation caused by the screw propeller

Observation of cavitation caused by the screw propeller

Observation of cavitation caused by the screw propeller

Shooting speed: 125,000 frames/sec
Courtesy of Dr. of Eng. Kawanami, National Maritime Research Institute JAPAN

When the screw propeller of a ship operates underwater, a swirling effect called cavitation occurs. This swirling effect is closely related to the ship's propulsive efficiency as well as propeller cracking and damage. As such, cavitation has been a topic of detailed research for many years.

t = 0μs Cloud cavitation generated on a propeller blade surface
t = 56μs Constriction of cavitation
t = 112μs Moment of cavitation collapse
t = 192μs Re-expansion (rebound) of cavitation

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