Highly Skewed Propellerの研究 : 第2報船尾変動圧力

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In the previous paper 1), authors presented the results of propeller open test, self-propulsion test and cavitation test (cavity extent and thickness) which were performed by using MAU type conventional propeller (MPNO. 80-3), conventional 90° Highly Skewed Propeller (HSP) (MPNO. 80-4) and theoretically designed 72° HSP (MPNO. 80-5). They also described the outlines of simplified method to calculate Wake Adapted Skew Distribution (WASD) and non-linear lifting surface method to estimate propeller open characteristics which were applied to MPNO. 80-5 propeller design. The result of Propeller open test reveals utility of non-linear lifting surface method for high efficiency HSP design. In this report, the test results of fluctuating pressure induced by the above-mentioned three propellers and measured in cavitation tunnel are presented. Comparing with fluctuating pressure amplitude (1st blade frequency component) of MPNO. 80-3, that of MPNO. 80-4 is reduced to about 57% and that of MPNO. 80-5 is reduced to about 12%, which reveals that skew distribution as well as skew angle significantly effects on fluctuating pressure and simplified method to calculate WASD is useful for HSP design. Then, authors propose a practical method for calculating necessary skew angle to reduce propeller-induced fluctuating pressure amplitude to allowable level. The method is based on Holtrop's statistical method^<12)> for predicting vibratory hull forces and Holden's criterion^<l9)> for fluctuating pressure amplitude. Recommendable skew angles indicated by examples of numerical calculation for eight ships are as follows ; 030skew angle for bulk carrier 4060skew angle for pcc 5070skew angle for container
社団法人日本船舶海洋工学会の論文

Highly Skewed Propellerの研究 : 第2報船尾変動圧力

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Highly Skewed Propellerの研究 : 第2報 船尾変動圧力

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Highly Skewed Propellerの研究 : 第2報船尾変動圧力