Active control of subharmonic transition of boundary layer

Tollmien-Schlichting-wave resonant mechanism for subharmonic-type transition

“…That explains the link between linear amplification of the most unstable wave and the location of transition. This speculation was supported by numerical results on a transitional airfoil (Zelman & Maslennikova 1987). Note, however, that the nature of the primary wave (crossflow instability, Gortler vortices, etc.)…”

“…The observed nonlinear growth of b(x) may be explained by the nonlinear influence of three-dimensional waves which were amplified in the interval x,) d x 6 xl. The efficiency of boundary-layer control was analysed by Zelman & Maslennikova (1987) on the basis of the present model.…”