推進法の差異が推進性能におよぼす影響について : その2:ダクテッド・プロペラ,3軸プロペラおよびコントラローティテング・プロペラの比較

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In succession to the first report which dealt with the comparison among single, twin and overlapping screw propellers, the comparison among ducted, triple and contrarotating screw propellers is dealt with in this paper. Furthermore, the relationship between stern shapes and a duct on a single screw ship is investigated. The main results obtained from the model tests are as follows : (1) The stern shape having "U" type of frameline has superior propulsive performance to "V" type in spite of disadvantage on resistance. (2) In the case of the ducted propeller, effect of "U" type and "V" type on propulsive performance is quite a similar to the case of the conventional propeller as stated in (1). The ducted propeller gives a higher propulsive performance than in the case of the conventional propeller under 44% loaded condition and both propellers show almost the same propulsive performance under the fully loaded condition. (3) Propulsive performance of the triple screw ship having wing propellers turning inward, is better than in the case of turning outward. (4) We have to pay much attention to the design methods of contrarotating propellers. (5) The estimated delivery horse power of the ship at V_S=18 knots (F_n=0.16), with a single screw (U type), single screw (U type) fitted with a duct, triple screw (wing propeller : outward turning) and contrarotating propellers, are 82,000 ps, 84,000 ps, 84,000 ps, and 89,000 ps respectively. (6) In comparing six propulsion devices, minimum power was achieved for the triple screw ship with inward-turning wing propellers.
独立行政法人海上技術安全研究所の論文
1979-03-31

推進法の差異が推進性能におよぼす影響について : その2:ダクテッド・プロペラ,3軸プロペラおよびコントラローティテング・プロペラの比較

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