Abstract
A marine propeller operating in non-uniform flow behind a ship accompanies in most cases unsteady cavitation on its blades. For the study on cavitation and its effect on erosion and radiated pressures, it is essential to observe and examine the behavior of the unsteady cavity changing rapidly with time.This paper describes a method to visualize the unsteady cavity on propeller bledes using a laser coupled with data processing system developed in the Nagasaki Experimental Tank of Mitsubishi Heavy Industries, Ltd. With this method, the cavity surface can be obtained by a series of reflecting points of the laser beam traversed in the chordwise direction. The results are illustrated on the graphic display as well as on digital plotter, and thus this method is expected to provide useful information for understanding of unsteady cavitation of marine propellers.
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