Additives Injected Into the Boundary Layer of an Underwater Body 



figures are replotted in Figs. 8 to 12 to show the effect of polymer concentration 

 on the drag reduction for different tunnel velocities. It is usual when plotting 

 drag reduction to plot the percentage reduction. However, in this work we have 



100 200 300 400 500 600 700 



Tunnel Velocity -cnn/sec. 



Fig. 4 - Drag of body plus wing supports 

 and trip wire at nose 



Drag 

 Redudion -gms 



4 



0.25mm. Nose Slot 

 Flow Rote - 30 ml/sec 



100 200 300 400 500 600 700 



Tunnel velocity - cm/sec. 



Fig. 5 - Drag reduction using POLYOX WSR-35 



981 



