A • TRANSITION FROM LAMINAR TO TURBULENT FLOW 



A 



- 12 







10 



2 4 6 8 



sic' 



Fig. A,12d. Pohlhausen pressure gradient parameter X of boundary- 

 layer for elliptic cylinder and Joukowsky I airfoil. 



10^ 

 8 



6 

 4 



(ResJc 



103 



8 

 6 



4 



102 



— 6-4-2 2 4 6 8 



X 



Fig. A,12e. Critical Reynolds number at which boundary layer oscillations 

 are amplified as function of pressure gradient parameter X. 



< 34 ) 



