基于阻力和伴流不均匀度的21万吨散货船线型优化

Lines optimization of 210000 DWT bulk carrier based on resistance and wake non-uniformity

[目的]基于船体绕流场计算分析,以阻力和伴流不均匀度为优化目标,对21万吨散货船线型进行优化设计。[方法]首先,借助计算流体动力学(CFD)工具对初始线型进行数值评估并计算船体绕流场,得到波形、压力分布、速度分布等流场特征。其次,根据CFD计算结果,构建优化策略,形成改型方案,并对改型方案进行CFD计算,评估阻力和伴流不均匀度优化效果。最后,开展优化后船型快速性模型试验,验证优化效果。[结果]CFD计算结果表明,改型相较于原型,有效功率降低了2.46%,伴流不均匀度降低了8.48%。模型试验结果表明,改型相较于原型,螺旋桨收到功率降低了3.49%。[结论]研究显示,所提出的优化方法可以获得阻力性能优良、伴流场均匀性好的船体线型,具有较强的工程适用性。

[Objectives]This study calculates and analyzes the flow field around the hull of a 210000 DWT bulk carrier in order to perform hull line optimization with resistance and wake non-uniformity as the optimization objectives.[Methods]Computational Fluid Dynamics(CFD)is used to evaluate the initial hull lines,calculate the flow field around the ship and obtain flow field characteristics such as the wave pattern,pressure distribution,velocity distribution,etc.According to the CFD calculation results,an optimization strategy is constructed to form the modified hull lines.CFD calculation is then carried out on the modified lines to evaluate the optimization effects on resistance and wake non-uniformity.Finally,a model test of the optimized hull form's power delivery performance is carried out to verify the optimization effects.[Results]The CFD calculation results show that compared with the initial hull form,the effective power of the modified hull form is reduced by 2.46%and the wake non-uniformity is reduced by 8.48%,while the model test results show that compared with the initial hull form,the delivered power of the modified hull form is reduced by 3.49%.[Conclusions]The proposed optimization method can obtain hull lines with excellent resistance performance and good wake field uniformity,giving it strong engineering applicability.