Experimental Investigation on the Transition of Laminar Separated Layer

Transition of two-dimensional separated layer was investigated in detail. Mean velocity distribution of laminar layer shows a similar profile and agrees with Lin's calculation. In the transition region, hot-wire anemometer survey of velocity fluctuation revealed the existence of sinusoidal wave, the frequency of which lies in the unstable zone predicted by stability theory. Transition points determined by layer thickness and by fluctuation measurements are in good coincidence. A simple empirical relation was derived for transition distance.