Additives Injected Into the Boundary Layer of an Underwater Body 



40 



30 



~i r 



25rnm Nose Slot 

 Flow Rote SOTil/sec 



500 ppm 



375 ppm 



lOOOppm 



- 250ppm 



- 100 ppm 



50 ppm 

 25ppm 



7. 5ppm 



100 200 300 400 500 600 700 



Tunnel velocity - cm/sec 



Fig. 7 - Drag reduction using 

 POLYOX WSR-301 



Drog 



Reduction -gms 



Tunnel velocity- 300cm. /sec. 

 0.25mm. Nose Slot 

 Flow rote - 30ml/sec. 



- Polyox WSR-301 - 



•Polyox WSR-205 

 WSR-35 



50 100 150 200 250 300 



Polymer concentration - parts per million by weight. 



Fig. 8 - Drag reduction vs polymer concentration 



983 



