Abstract
Stripe structure in turbulent boundary layer has been clearly visualized by a combination of a shear stress imaging chip using MEMS (Micro-Electro-Mechanical-Systems) and discrete wavelets transform. In details, the structure in lower Reynolds number is shown clearly on the lower frequency wavelets level, the structure in high Reynolds number is done clearly on the higher frequency wavelets level. The MEMS shear stress sensor is designed and fabricated by surface micromachining technology, contributing to obtaining the time-space two dimensional shear stress data. The discrete wavelets transform is a software technique to decompose the frequency level with the time and space information of the wave. The experiments for shear stress distribution were carried out on Re = 6960, 12180 and 17400.
