船用梯形微沟槽表面减阻效应的仿真分析与实验验证

基于微沟槽减阻机理,采用改变船体表面微结构形貌尺寸的方法,以期降低船舶运行中的航行阻力,提高船舶航行效率,节约能源。利用流体软件FLUENT对梯形肋条和梯形沟槽两种微结构表面流场进行模拟仿真,分析了沟槽深宽比h/d1的减阻效果。仿真结果表明,对于梯形肋条,在h/d1时均具有减阻效果,当h/d为0.45时减阻效果最好;对于梯形沟槽,当h/d为0.30、0.36时表现为增阻,h/d为0.45、0.60、0.75时表现为减阻,其中当h/d为0.60时的减阻效果最好。为了验证模拟计算的规律,进行了阻力冲刷实验,实验结果与模拟计算结果的对比分析表明模拟计算与实验结论一致。

Simulation analysis and experimental validation of drag reduction performance of marine micro-trapezoidal groove surfaces

Based on micro-groove drag reduction mechanism, this study attempts to reduce the ship sailing resistance through changing the size of the ship surface microstructure so as to improve ship navigation efficiency and energy savings. The FLUENT software is used to conduct simulation analysis of drag reduction effect by two types of surface microstructures, trapezoidal ribs and trapezoidal grooves under the aspect ratio h/d<1. For trapezoidal ribs, they have drag reduction effect within the range of the aspect ratio h/d<1. When the aspect ratio h/d= 0.45, the drag reduction effect is the best. For trapezoidal grooves, when the aspect ratio h/d=0.3, 0.36, the resistance increases. When h/d= 0.45, 0.6, 0.75, the drag reduction effect occurs. When h/d=0.6, the drag reduction effect is the best. In order to verify the tendency of simulation calculation, the corresponding resistance experiments are conducted. The comparison results between the experimental results and simulation calculation show that they are consistent.