평판 위 흐름 Defect Law 영역의 난류 특성 연구

Abstract

To investigate the turbulence characteristics within the boundary layer over a flat plate, an experimental study was performed usinga PIV technique in a circular water channel. For two water velocities, 0.92 and 1.99 m/s, the water velocity profiles were taken and analyzed todetermine turbulent characteristics such as the Reynolds stress, Taylor micro-length scale, and Kolmogorov length scale within the defect law regionof the boundary layer. These analysis methods may be applied to research on the friction drag reduction technology using micro-bubbles or an airsheet over the surface of a ship’s hull, because the physical reason for the friction drag reduction could be found by understanding the variation ofthe turbulence characteristics and structures in the boundary layer.