脊状表面水下航行器模型减阻实验与数值仿真

Drag reduction experiment and numerical simulation for riblets surface of underwater vehicle model

针对水下航行器提高航程和航速的需要,开展近壁面湍流边界层减阻的研究。在航行器模型外表面加工具有一定形状尺寸的脊状结构,导致湍流边界层的流动稳定性增强,壁面摩擦阻力降低。开展了轴对称航行器模型在高速水洞中的阻力测试并做了相应条件下的数值仿真,实验和数值仿真的结果基本一致。具有垂直流向脊状表面的航行器模型在一定来流速度范围内具有很好的减阻效果,脊状表面所受的压差阻力略有增大,占总阻力份额80%以上的粘性阻力显著降低,从而形成减阻效果。

The studies on drag reduction of near-wall turbulent boundary layer have been carried out to meet the requirement for increasing the voyage and speed of underwater vehicle. Riblets structure with certain shape and dimensions on the surface of underwater vehicle model can be machined, causing the flow stability of turbulent boundary layer to be enhanced and the friction drag on the wall to be educed. The drag test for the axial symmetrical vehicle model in the high speed water tunnel is made, and corresponding numerical simulation is performed. The results of experiment and numerical simulation are basically consistent. The underwater vehicle models with the vertical flow riblets surface have obvious drag reduction effects within certain incoming flow velocity range, pressure drag applied on the riblets surface is increased slightly, and viscous drag, which is 80% of total drag, is remarkably reduced compared with smooth surfaces, forming the drag reduction effect.