バルブ付き肥大船型の推進性能に関する研究第2報

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No.1 Report of the Investigation into the Propulsive Performance of Super Tankers with Bulbous Bow, which was published in 1967 in the Report of Ship Research Institute, dealt with the effect of fore-body shape for two groups of models with C_B=0.80, L/B=6.0 and C_B=0.82, L/B=6.5.The present report consists of two parts.In part I was studied mainly the effect of l_<CB> for three groups of models with C_B=0.80 and L/B=5.5, C_B=0.82 and L/B=6.0, and C_B=0.84 and L/B=7.0.In part II was investigated the effect of bulb size at bow and stern shape for the models of C_B=0.80 and L/B=6.0.The principal results of these series tests are as follows;(1)Under the fully loaded condition, optimum l_<CB> for each group of C_B=0.80, 0.82 and 0.84 were found to be about -3.0, -2.7 and -2.3% of L_<PP>, respectively, at Fn=0.16.(2)Under the ballast condition, optimum l_<CB> were not always found at the ordinary speed range of tankers.(3)Wake fraction w, increases monotonously as l_<CB> moves aft for every group tested here, but thrust deduction coefficient t and relative rotative efficiency η_R do not show regular variation due to the change of l_<CB>.(4) The bigger bulb, whose sectional area at F.P. is 12% of midship sectional area A_M, shows lower resistance through the speed range tested under the fully loaded condition and at higher speed range than Fn=0.15 under the ballast condition.(5)Self-propulsion factors do not vary so much owing to the change of bulb size, but the hull efficiency of the model with the bigger bulb is rather worse as the increase of t is larger than the increase of w_T.(6)As expected, V shape of the aft body shows smaller values in both resistance and propulsive coefficient. Further works are being carried out in this field and Report No.3 will be published in near future.
独立行政法人海上技術安全研究所の論文
1969-03-31

バルブ付き肥大船型の推進性能に関する研究第2報

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バルブ付き肥大船型の推進性能に関する研究 第2報

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バルブ付き肥大船型の推進性能に関する研究第2報