Abstract
Measurement of Flow velocity distribution around a marine propeller was carried out by Laser Doppler Velocimeter in a cavitation tunnel. The LDV measurement system which can supply both velocity data and measuring position data relative to blade position was developed, and the information about instantaneous velocity distribution around propeller blades was obtained. Authors succeeded in revealing the vortex system around propellre blades. The effects of strong vortex extending from blade tip was found in the measured velocity data. Accelerated and contracted vortex extending from blade tip was found in the measured velocity data. Accelerated and contracted Flow behind blades was also appeared. Thrust and torque estimated from velocity distribution in slip stream ware compared with direct measurement results. Comparison between experimental results and ligting surface theory shows that the existence of strong tip vortex shown by the experiment can not be followed by the theory. It is necessary to investigate the separated Flow in the region near the blade tip, in order to improve the theoretical method.
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