32 





TMB 24967 



Figure 22b -<r»0-5, Exposure Time: l/lO,000 

 Second 



Figure 22a - <7~0.5, Exposure Time: 2 Seconds 



Figure 22 - Vortex Cavitation Behind a Disc 



YMAX . 

 R 

























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1NCK 



DISC 



















7-1.5 INCH DISC 



















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f YMAX. 



■ + 

























*|H^- PRESSURE TAP 









'o 















V -~ 





































\? 







































o 



fe — 











r-'VORTEX" 

 CAVITATION 













V 





o 



/ 



V 



V 



■7 



o 







~~1 

















V v 



V 



r <$> 



& 







— ■ 



_ W -J 

















































































































1 



c 



.2 



C 



)3 



c 



A 



c 







To 



5 







6 







7 



C 



.8 





Figure 23 - Relation Between Maximum Cavity Ordinate and Cavitation 

 Number for Cavitation Behind a Disc — From Reference kO 



Pressure measurements taken along the center line of various cavi- 

 ties are shown in Figure 2k. The measurements in the upper part of Figure 24 

 were made in cavities within the region of "vortex" cavitation. The remaining 

 measurements were made in cavities of progressively lower maximum cavitation 

 number. It will be observed that for the highest cavitation number, the 



