UNCLASSIFIED 



0.E, APR 3 01981 



";ECU;';ITY classification of this page (tVhen Data En 



REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1 . REPORT NUMBER 



DTNSRDC-81/007 



2. GOVT ACCESSION NO. 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (and SubtUle) 



TIP VORTEX CAVITATION CHARACTERISTICS AND 

 DELAY OF INCEPTION ON A THREE- 

 DIMENSIONAL HYDROFOIL 



5. TYPE OF REPORT a PERIOD COVERED 



Research and Development 



6- PERFORMING ORG. REPORT NUMBER 



7. AUTHORfs; 



8. CONTRACT OR GRANT NUMBERfsJ 



William G. Souders 

 Gregory P. Platzer 



PERFORMING ORGANIZATION NAME AND ADDRESS 



David W. Taylor Naval Ship Research 

 and Development Center 

 Bethesda, Maryland 20084 



(See reverse side) 



II. CONTROLLING OFFICE NAME AND ADDRESS 



David W. Taylor Naval Ship Research 

 and Development Center 

 Bethesda, Maryland 20084 



12. REPORT DATE 



April 1981 



13. NUMBER OF PAGES 



65 



U. MONITORING AGENCY NAME ft ADDRESSf// different from Controlling Office) 



Naval Material Command 

 Washington, DC 20360 



15. SECURITY CLASS, (of (his report) 



UNCLASSIFIED 



16. DISTRIBUTION STATEMENT (of this Report) 



APPROVED FOR PUBLIC RELEASE: DISTRIBUTION UNLIMITED 



17. DISTRIBUTION ST A.TEMEHT (of the abstract entered In Block 20, II different from Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue on reverse side If necessary and Identify by block number) 



Tip Vortex Cavitation Mass Injected Tip 



Tip Vortex Cavitation Delay , Roughened Tip 



Marine Lifting Surfaces Bulbous Tip 

 Performance 



20. ABSTRACT (Continue on reverse side II necessary end Identify by block number) 



A research program was conducted to investigate both the fundame ^al 

 aspects of, and techniques for delaying, tip vortex cavitation on a three- 

 dimensional hydrofoil. The specific concepts considered for delaying tip 

 vortex cavitation included: a bulbous tip, an artifically roughened tip, and 

 a mass injected tip. The experiments were conducted in the David W. Taylor 



(Continued on reverse side) 



DD 



EDITION OF 1 NOV 65 IS OBSOLETE 

 S/N 0102-LF-0U-6601 



UNCLASSIFIED 



SECURITY CLASSIFICATION OF THIS PAGE (When Date Bnfred) 



