Page 



20 - Flow from Left to Right Shows: (a) Some Details of 



Transition on a Two-Inch 1.5-Cal Ogive Body at 



30 ft/sec, (b) Desinent Cavitation at the Same 



Velocity, and (c) and (d) Similar Results at 



40 ft/sec. (Arakeri and Acosta 1974) 37 



21 - Inception and Desinent Cavitation Index for the NSRDC 



Body in the Caltech HSWT at an Air Content of 

 10.4 ppm (The numbers in parentheses repre- 

 sent the number of data points and the 

 height of the bars, the range of the 

 data. ) Laminar separation was not 

 observed greater than about 28 ft/ 

 sec. (Arakeri and Acosta 1976) 39 



22 - A Tripped Boundary Layer on a Two-Inch Hemisphere Body 



at a Subcritical Reynolds Number (The trip is located 



30 degrees from the nose and is 0.012 inches high, 



Arakeri and Acosta 1976) 41 



23 - A Two-Inch Hemisphere Body with Trips Showing the 



Disappearance of Cavitation as Tunnel Speed is 



Increased and the Cavitation Index Decreased 



(The left side sequence has a trip height of 



0.012 inches and the right side has a trip 



of 0.005 inches, Arakeri and Acosta 1976) 42 



24 - Cavitation Inception Index versus Tunnel Speed for a 



1.81-Inch Hemisphere Body with a 0.005-Inch Trip 



(The water tunnel is the Caltech HSWT: in every 



case inception occurs as an attached cavity. 



The numbers are the number of data points 



and the bars show the experimental range, 



Arakeri and Acosta 1976) 43 



25 - Cavitation on a Two-Inch Hemisphere Body (Speed = 43.5 



ft/sec with a 0.014-inch trip located 30 degrees from 



the nose spanning one-half the circumference. The 



cavitation index is 0.56. Downstream of the trip 



there is no cavitation (upper portion) and on 



the lower portion of the body the normal band 



cavitation can be seen. Photo courtesy of 



Professor J. W. Holl, Penn State 



University) 44 



