A traversing system with a streamlined strut was mounted on a guide 

 plate that permitted the traverse to be locked in various stationary 

 positions parallel to the longitudinal model axis. 



COMPARISON OF EXPERIMENTAL AND THEORETICAL RESULTS 

 Two coordinate systems for an axisymmetric body are given in Figure 3, 

 The coordinate system used to experimentally measure the boundary-layer 



Figure 3 - Axisymmetric Coordinate Systems 



flow and to report the results is the x-r coordinate system. The axial 



coordinate x is measured from the nose of the body parallel to the axis of 



revolution. The radial component r is measured from the axis of revolution 



and is normal to the x-axis. The curvilinear s-n coordinate system is used 



in the Douglas C-S differential boundary layer method. The arclength 



coordinate s is measured parallel to the body meridian and the tangent 



coordinate n is measured normal to the body meridian. 



The Douglas C-S boundary layer method is used in conjunction with the 



displacement body concept to predict the flow over the body. Wang and 



3 

 Huang have made several modifications to the Douglas C-S code in an 



attempt to better model a thick stern boundary layer. A comparison of 



their original theory with experimental results is given by Huang et al. 



That comparison revealed several inadequacies in the theory. Wang and 



3 

 Huang subsequently modified their original method based on these experi- 

 mental comparisons. The new modifications are evaluated in the present 

 investigation. The mixing length in the thick stern boundary layer region 

 is modeled by a simple algebraic formula proposed by Huang et al. This 

 formulation includes only transverse curvature effects. The eddy viscosity 



