Active control of laminar boundary layer

Institute of Fluid Science, Tohoku University- Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan qiu @ ifs. tohoku.ac.jp

Abstract

In this study, three types of surface motion of smart skins were proposed and used to control the Tollmien-Schlichting (T-S) wave in the laminar boundary layer of a plate. These three types of motion are standing transverse wave (with out-of-plane displacement), traveling transverse wave (with out-of-plane displacement) and standing longitudinal wave (with inplane displacement). The length of a smart skin was set to 1, 2 or 3 cycles of waveform. Numerical simulation was performed on the generation of T-S wave and its suppression with the three types of surface motion of the smart skin and the dependence of control effect on the amplitude and the phase of the surface motion, and the number of waveform was investigated