沟槽面湍流边界层减阻特性研究

在光滑平板中分别嵌入一段不同尺寸的沟槽板，通过分析构槽板前后流场速度分布、紊动特性等的变化，得出：沟槽板上粘性底层厚度比沟槽板上、下游光滑平板处增大，沟槽板上流速分布对数公式中的C值也比上、下游光滑平板的C值大，说明沟槽板上局部摩擦阻力较小，进而对沟槽板局部减阻特性进行了深入的探讨。

Drag-Reduction Characteristics of Turbulent Boundary Layer Flow over Riblets Surfaces

The riblet plates with different dimension are inserted in the smooth plate respectively. Based on the comparison between the distributions of velocity and turbulent intensity over the smooth plates down stream and up stream of the riblet plate and those over the riblet plate, it is found that both the thickness of viscous sublayer and the integral constant C in log law have larger values for riblet surfaces, and this implies that the local friction of the flow is reduced. Moreover, the local drag reduction characteristics is discussed in detail.