Wake Adapted Propellerに関する実験的研究

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Conventional propellers and wake adapted propellers were designed based on the MAU propeller design chart and the Eckhardt-Morgan method respectively, in using the wake pattern of a ship model measured in the towing tank and the estimated wake pattern of an actual ship -270,000dwt. tanker. And then propeller open water tests in non-uniform flow as well as in uniform flow, cavitation tests in non-uniform flow and self-propulsion tests have been carried out to compare synthetically the performance between propellers. The erosion phenomena on actual propellers of 210,000dwt. tankers were also examined to clarify the relation between model tests and actual propellers' results. It may be concluded as follows: a) Wake adapted propellers show almost the same propeller efficiency as of conventional propellers in uniform flow. In non-uniform flow, however, efficiency of the wake adapted propellers is slightly higher. b) Propulsive efficiency is also almost the same each other under fully loaded condition and under ballast condition the wake adapted propellers give somewhat higher value. c) The extent of cavitation on the wake adapted propellers is fairly wider. It is advisable to reduce the pitch near the propeller tip in order to improve the above mentioned cavitation extent. d) Roughly speaking, erosion phenomena on actual ship propellers appear in the region near the leading edge at 0.5R〜propeller tip and between the midchord and trailing edge at 0.8R〜propeller tip.
社団法人日本船舶海洋工学会の論文
1978-08-15

Wake Adapted Propellerに関する実験的研究

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