0.32 0.36 



LIFT COEFFICIENT C, 



Figure 33 - Tip Vortex Cavitation Inception Speed Ratio as a Function of Lift 

 Coefficient for the Active Mass Injection Foil 



approximately equivalent to the flow rate obtained using an average injection veloc- 

 ity U. equal to the freestream velocity U, U. = U, and area based on the injection 

 nozzel inside diameter. 



SUMMARY AND CONCLUSIONS 

 Several TVC delay concepts have been evaluated at high Reynolds number on a 

 three-dimensional lifting surface. The results indicate that all of the concepts 

 significantly delay TVC inception: increased TVC inception speeds of 94 percent 

 for the roughened tip, 38 percent for the bulbous tip, and 33 and 54 percent for 

 the passive and active mass injection tips, respectively. In most cases, the 



47 



