抄録
We carried out experiments to measure velocities within turbulent water flow over wavy plates fixed to the bottom of an open channel. We also have measured total drag acting on these plates. Wall-shear stress is evaluated from the gradient of mean velocity adjacent to the plate surface. The pressure drag is calculated from the difference between the total drag and friction drag. Results show that the friction drag for a symmetrical-wavy plate is 21% lower than that for a flat plate. The former, furthermore, offers benefits in reducing pressure-drag increases.
