中文摘要：

针对超疏水表面功能材料在流动减阻方面的潜在应用，使用数值模拟方法研究了超疏水性圆管内的湍流流动特性．研究表明：其流场中存在临界RP，当RP大于此临界值时，超疏水性圆管内的湍流流动表现为减阻；反之，则表现为增阻．超疏水表面无滑移壁面与自由剪切面的综合效果是导致这一现象的主要原因．

英文摘要：

For the possible drag reduction application of superhydrophobie surface, the turbulent flow in circular pipe with a superhydrophobic wall was studied by numerical simulation. It is found that in turbulent flow, there is a critical Reynolds number. When the Reynolds number of flow is larger than the critical Reynolds number, the flow shows drag reduction and vice versa. The results of analysis of the fluid field show that the exit of no slip boundary and shear-free boundary on superhydrhobic surface is the key reason for this phenomena.