Twin-skeg stern船型の推進性能に関する実験的研究 : 幅方向skeg位置の変化およびskeg間tunnel部の船底の傾斜の変化が推進性能におよぼす影響

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The propulsive performance on the ships with twin-skeg stern has not been clarified. This report deals with researches concerning the effect of variation in skeg's position and in skeg's tunnel between twin skegs upon the propulsive performance. The main results obtained from model tests are as follows: (1) Residuary resistance coefficient r_R increases with the increase of distance from skeg centerline to ship centerline. (2) Wake fraction W_T decreases with the increase of distance from skeg centerline to ship centerline. (3) The ship with twin-skeg stern has superior propulsive performance than ordinary twin screw ship with bossings. (4) In the range of the tests, inward rotation of propeller showed better propulsive performance for two twin-screw ships with ordinary bossings and with twin-skeg stern, and triple-screw ship. (5) Shaft horse power of ships under fully loaded condition and at ships speed 20 knots, are as follows: 1) Single-screw ship … 38,400SHP 2) Triple-screw ship … 37,100SHP 3) Twin-screw with twin-skeg stern … 34,450SHP 4) Twin-screw ship with ordinary bossings … 37,850SHP (6) The wake distribution is different at the inside and outside of skegs. The direction of flow is nearly upwards at inside of skeg, but, toward to a skeg at outside of skeg, especially horizontal near the skeg.
独立行政法人海上技術安全研究所の論文
1981-11-30