Aft Hull Lines of Positioning Bow Type Self-propelled Cutter Suction Dredger(CSD) and their Hydrodynamic Performance
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摘要: 【目的】定位艏型自航绞吸挖泥船船艉设有布置绞刀架的大开槽，导致该船型水动力性能与普通船型存在较大差异。通过研究双呆木艉和双尾鳍艉两种船艉型线的静水阻力性能、艉部流场、伴流分数与不均匀度等水动力性能，为合理选择和设计自航绞吸挖泥船船艉型线提供科学依据。【方法】采用CFD(Computational Fluid Dynamics，计算流体力学)方法，开展了船模阻力试验数值验证；在此基础上，对比分析了这2种船体型线的水动力性能。【结果】在各航速下，双尾鳍艉的总阻力系数均较双呆木船艉为小；在设计航速点，前者总阻力系数较后者小8.6%，而后者的伴流目标函数较前者小11.0%，轴向伴流场更均匀。【结论】研究结果对同类船型的型线设计和优化具有较强的参考价值。
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关键词:
- 定位艏型自航绞吸挖泥船 /
- 船艉型线 /
- 水动力性能 /
- 流场特征 /
- 伴流目标函数
Abstract: [Objectives] There is a large well in the stern to arrange cutter ladder for the positioning bow type Self-propellered CSD, which results in great difference on hydrodynamic performance from ordinary ships. By investigating hydrodynamic performance of two hulls with various stern shapes, namely twin deadwood and twin skeg, including calm water resistance behavior, stern wake field, wake fraction, and the nonuniform level of axial wake field, It provides scientific basic for rationally selecting and designing of stern lines for self-propelled CSD.[Methods] CFD(Computational Fluid Dynamics)method is applied to carry out simulation verification and validation of model resistance test. On this basis, hydrodynamic performance of the two hulls is compared and analyzed. [Results] At each of target speeds, the total resistance coefficient of twin skeg hull is lower than twin deadwood. At design speed, the total resistance coefficient of the former is 8.6% lower than the latter, while WOF(Wake Object Function) of the latter is judged to be better than the former by 11.0% from perspective of the nonuniform level of axial wake field.[Conclusions]The study results is of significant reference for lines design and optimization of similar hull type. -
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