沿海双桨货轮低阻船型

本船型是一种节能船型,它的线型特点是首都为“上翘首”,尾部为双尾鳍。 船模试验表明:该船型与常规双桨船型相比,满载状态下,F_n=0.19时,实船裸体有效马力可降低10.5％,剩余阻力系数下降38.2％。 如采用同样的主机(2×6350ZC)方案,则在额定功率的条件下,本船型与常规双桨船型相比,实船航速可提高0.71节;如与同样主尺度的单桨Todd线型比较,航速也可提高0.23节。在航速11节时本船型与常规双桨船型和单桨Todd船型相比,主机功率分别可降低19.8％和3.8％。 实船试航结果与船模试验的预报相当一致。

AN ENERGY SAVING TWIN-SCREW COASTAL CARGO SHIP HULL FORM

The paper describes a kind of energy saving hull form. It consists of the forebody with upturned bow and afterbody with twin-skeg stern.The model experimental results show that when the Froude number equals to 0.19 in full load condition, in comparison with the conventional twin screw hull the ship hull's effective horse power, excluding shell and appendage, comes down 10.5 percent and its specific residuary resistance coefficient drops 38.2 percent.For same rated power of the same main engine type, the design speed can be 0.71 knot faster than that of the conventional twin screw hull; and can increase by 0.23 knot in comparison with that of single screw Todd hull under same dimensions and displacement.At the 11 knots speed of ship, main engine's power consumed by this new hull can be 19.8 percent and 3.8 percent lower than that consumed by the conventional twin-screw hull and the single screw Todd hull respectively.A result of the trial run of the "Zhe-hai 304" built by Shanghai Zhong-hua shipyard consists with the predictive speed based on model tests very well.