艏艉线型优化对船舶阻力性能的影响

为提高母型船阻力性能,以船体阻力性能为优化对象,基于改造母型船法,研究船舶球鼻艏以及船尾线型的改变对船舶阻力性能的影响.采用高度集成化的Tribon系统、可视化绘图软件Auto CAD及CFD(Computational Fluid Dynamics)通用前处理软件ICEM联合建模的方法来建立船体模型.通过模拟计算结果与实验值的对比分析,验证CFD技术在船舶阻力性能预报中的合理性和有效性.通过对比3种不同球鼻艏时的船体阻力得知:从阻力性能方面考虑,对于低速丰满型船舶选用普通型球鼻艏以及中高速船舶采用上翘型球鼻艏均可以获取较好地减阻效果.同时比较不同航速下尾部线型对船体总阻力的影响表明,选优后的方形尾在相同的航速下阻力低、消耗的功率小、形状效应小、黏压阻力和摩擦阻力也相对较小.

Influence on the Ship Resistance Performance of the Lines Optimization of the Bow and Stern

In order to improve the performance of the original hull resistance,with the hull resistance as optimal object,the effect of varying bulbous stem and mold lines of stern to hull resistance was studied based on the modifying parent ship method.The highly integrated Tribon system,the visual mapping software Auto CAD and the current CFD pre-treatment software ICEM were used in the establishment of the hull model.The rationality and validity of the CFD technology used in the research of resistance performance was validated through the comparison of the results of simulation and experiment.Considered from the resistance performance aspect,the low speed plentiful ships selecting the popular type bulbous bow and the medium and high speed ships selecting the goes up bulbous bow may obtain the good effect of drag reduction through the comparison of the resistance of the ships with different kind of bulbous bow.Meanwhile,by comparing hull resistance of various mold lines stern under different speed show that the optimal ship hull featuring lower resistance and the minimum power consumption at the same speed,whose shape effect is smaller,the pressure resistance and friction resistance are relatively smaller than others through the effect of stern line on the hull resistance under different velocities.