Figure 2 - Cavitation on a Model Propeller Showing "Sheet" or 

 "Steady-State" Cavitation Near the Tip of the Uppermost Blade 



which on integration and evaluation at the center of the vortex gives the pres- 

 sure (see, e.g., Reference 9)- 



P„ = ? ~ 



111 



[3] 



where p is the pressure at the center of the vortex, 

 r is the circulation, and 

 v x is the radius of the vortex core. 



Here, again, the pressure may drop to very low values depending upon the 

 strength of the vortex. In the case of lifting surfaces, the conditions in 

 the tip vortices whose strengths are related to the lift distribution, may be 

 described approximately by Equation [3]. An example of cavitation in such a 

 flow is shown in Figure 5 in which the tip vortices of a model propeller are 

 clearly defined . 



