船尾変動圧力の推定に関する研究

概要

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Pressure fluctuation induced by unsteady cavitating propellers has been recognized as one of the most predominant sources of ship vibration and air/structure-borne noise. In order to predict vibration and noise intensities in full scale vessels, high accuracy in the measurement of pressure fluctuation in a cavitation tunnel is inevitable. Through comparative measurement at the Cavitation Committee of 18th International Towing Tank Conference, serious discrepancy was found among full scale measurements and model ones at various cavitation tunnels all over the world. This paper describes the measurement techniques employed in SRI, to improve such correlation between full scale and model measurement and to simulate the pressure field and velocity field around a cavitating propeller and ship stern in a cavitation tunnel reasonably and precisely. In the present paper, comparative model measurements were performed at SRI not only on a German container ship "Sydney Express" but also on various kinds of current ships built in Japanese ship builders. The correlation between full scale and model was examined in detail. Excellent agreements between them were obtained. Finally newly developed measurement techniques to essentially improve the measurement of pressure fluctuation are described.
独立行政法人海上技術安全研究所の論文
1991-07-30