1. Measurement of Pressure Distribution on a Full Scale Propeller : Measurement on a Conventional Propeller

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This paper describes the first development of sophisticated pressure measurement technique for a full scale propeller and the success of the measurement. The full scale measurements were carried out on the training ship "SEIUN-MARU'. Six pressure pick-ups were equipped at each of four propeller blades. The measured non-dimensionalized pressure distributions were similar at each condition, except cavitation regions on the blades. The measured pressure distributions were compared with the theoretical ones obtained by the existing lifting surface theory. In this calculation, the estimated nominal wake distribution calculated by Sasajima's method was employed. Excellent agreements with theory were found at most of the measurement points, especially at the fore part of the blades. These results clearly demonstrate that the use of this estimated wake and the lifting surface theory with the concept of the equivalent two-dimensional profile is quite reasonable for a conventional propeller in general. Near the top angular position, some discrepancies between the measurements and the theory were observed, probably due to the deformation of the nominal wake induced by the propeller. The present full scale measurements indicated that there still exist some problems on the lifting-surface theory and on the use of nominal wake. These measurements also confirmed that the measured pressure in the sheet cavitation region was nearly equal to the vapor pressure at each working condition. The present measurement has provided a number of invaluable standard data to validate the numerical computational techniques on marine propellers at high Reynolds number.
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1. Measurement of Pressure Distribution on a Full Scale Propeller : Measurement on a Conventional Propeller

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