模型船船尾伴流中とワイヤーメッシュ法による伴流中のプロペラキャビテーションの比較試験

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The large cavitation tunnel of the Ship Research Institute has two interchangeable working sections.The smaller one (No.1 working section) has a circular cross section of 0.75m in diameter in which propeller is tested in non-uniform flow simulated by wire mesh screen. The larger one (No.2 working section) has a rectangular section of 2m in width and 0.88m in depth in which propeller is tested in wake behind ship model.However, relationship between cavitation pattern of the propeller in non-uniform flow simulated by wire mesh screen and that in wake behind ship model has ever been compared scarecely.Therefore, the differences of cavitation patterns of the propellers, tested by means of the above mentioned different experimental techniques, have been investigated using three geosim ship models and corresponding three propeller models. Axial velocity distribution in the No.1 working section was simulated by wire mesh screen, which was almost similar to the axial velocity distribution behind ship model measured in the No.2 working section.As the results of the tests, following conclusions were obtained.1)At the same angular positions, extent of the sheet cavitation on the propeller blade in the No.1 working section was much larger than that in the No.2 working section.2)Processes of the appearance and desinence of the sheet cavitation and cloud cavitation between the No.1 and No.2 working section were also very much different.3)Many reasons can be considered with regard to the above mentioned phenomena. One of the main reason may be considered that the nominal wake distribution can be simulated, but the effective wake distribution become much different distribution when propeller is operated. However, this fact did not yet substanciate. In order to solve the problem, development of the flow measuring technique by using Laser Doppler Velocimeter is expected.
独立行政法人海上技術安全研究所の論文
1982-11-30

模型船船尾伴流中とワイヤーメッシュ法による伴流中のプロペラキャビテーションの比較試験

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