6 u 

 6* = r (1 - -^)dn, [displacement thickness 

 o e (planar definition) ] 



Y = [1 + 5.5 (-J-) ] , (intermittency 



factor) , 



& - 6995 , (boundary-layer thickness), 



T , (wall shear stress) , 

 w 



Ug is the potential-flow velocity used in the 

 boundary-layer calculations , and at y^., , e^ is equal 

 to e . A computer code to solve for the values 

 Ug/Ug and v^/Ug has been developed by Cebeci and 

 Smith (1975) using Keller's numerical box scheme. 



The velocity components measured in the present 

 investigation are u^^ and v , the components in the 

 axial and the radial directions of the axisymmetric 

 body. The computed values of Uj. and Vj. are given 

 by 



u (r) u (n) U 

 X s e 



V (n) U 

 n e 



V (r) 

 r 



u (n) U 

 s e 



V (n) 



sina + 



sina, 



cosa, 



(4) 



(5) 



135 



where Ug/U and Vj^/U are computed by the CS method. 

 The potential-flow pressure is assumed to be con- 

 stant between the body surface and the displacement 

 surface and is equal to the pressure p^ computed on 

 the displacement body. The valu e of Ug used in Eqs. 

 (4) and (5) is equal to /l - p^ and U is assumed 

 to be parallel to the body surface. 



The displacement-body concept can be used to 

 improve the computed values of u^ and v outside 

 of the displacement surface of thick boundary layers, 

 e.g. , 



u (r) u (n) 

 X s 



U cos(e-a) 



-£ 



U U cos(e-a) 

 o p 



V (n) 

 n 



(6) 



U sin(e-a) 

 P 



U sin(e-a) 

 P 



sina. 



V (n) 

 r 



u (n) U cos (9-a) 

 _s p 



U COS (9-a) 

 P 



V (n) U sin(e-a) 



^ U sin(e-a) -^ ^°^^' (^' 



p o 



where the variation of the inviscid static pressure. 



0.05 



0.10 



0.15 



0.20 



KIGURK 7. Computed and measured static pressure distributions across near wake of afterbody 2. 



