The Douglas C-S computer code is used to calculate the velocity 

 components u and v parallel to and normal to the body surface, respec- 

 tively. Wang and Huang modified these velocity components by using the 

 predicted potential flow velocities outside of the displacement body and 

 converted the normal and tangential velocity components to axial and radial 

 components for comparison with the experimental values. 



COMPARISON OF MEAN PROFILES 



Figure 7 shows a comparison of the theoretically predicted and 

 experimentally measured mean axial u and radial v velocity profiles at 

 various axial locations on the body. The velocity components are non- 

 dimensionalized by the free stream velocity U . The solid curves represent 

 the theoretical results, the open symbols are the "X" hot-film values, and 

 the solid symbols are the single element hot-wire values. The accuracies 

 of the experimental measurements of u /U and v /U were estimated to be 

 about 0.5 percent and 1.0 percent, respectively. 



Figure 7 shows the good agreement between the theoretical and the 



"X" hot-film experimental axial velocity profiles, and even better agreement 



3 

 with the theory for the single element sensor. Wang and Huang modified 



the eddy viscosity model, and this modeling plays an important role in 

 computations of axial velocity profiles near the wall. The agreement be- 

 tween theory and experiment is shown in Figure 7 to be very satisfactory 

 near the wall. 



The agreement between theory and experiment for the radial velocity 

 profiles is generally less satisfactory. This velocity component is small 

 and more difficult to measure accurately. Nevertheless, the maximum 

 difference between the computed and measured values of v /U is less than 

 0.03. 



COMPARISON OF MEASURED AND COMPUTED INTEGRAL PARAMETERS 

 The distributions of (radial) displacement thickness 6 and (radial) 

 boundary layer thickness 6 are given in Figure 8 along with the stern 

 profile of the axisymmetric body. The theoretical boundary layer thickness 



30 



