不同形状长月池对钻井船阻力影响研究

Research on Resistance Performance of Drillship with Different Recessing Type Moonpools

针对某钻井船,在上海交通大学多功能拖曳水池进行模型试验,结合CFD数值模拟,研究长阶梯月池的增阻效应。研究发现,月池增阻明显,在高航速下,增阻幅度可能超过50%。比较该钻井船8.58m吃水下不同形状月池的阻力,可知阶梯后置式月池相较于阶梯前置式月池具有更好的阻力性能,而倾斜的月池前后壁也会带来一定的减阻效果。钻井船航行时月池内水体的周期性漩涡和由此引起的水体振荡是形成月池增阻的主要原因。月池形状优化后,月池内水体振荡较为和缓,从而减小了月池增阻。得到的结论能为月池减阻设计提供一定的参考。

Based on a drilling vessel,a model test was carried out in the multi-functional towing tank of Shanghai Jiao Tong University,combined with CFD numerical simulation,in order to study the added resistance of recessing type moonpools. It is found that additional resistance of moonpool is significant and may exceed 50% at high speed. Comparing the resistance of different recessing moonpools of this drillship under the draft of 8.53m,it shows that moonpool with postposition recess has better drag performance than that with preposition recess. Besides,inclined fore wall and rear wall of moonpool can bring a certain amount of drag reduction. Water oscillation caused by periodic eddy during the navigation of drillship is the main cause of added drag. After having optimized the shape of the moonpool,the water oscillation inside the moonpool is more gentle,which reduces the drag increase of the moonpool. These conclusions can provide reference for the drag reduction design of moonpool.