m 



UNCLASSIFIED 



^H AUG 



?n 



"JECUftlTY CLASSIFICATION OF THIS PAGE (Whan Data Enlarad) 



'i^79 



REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1. REPORT NUMBER 



DTNSRDC-79/051 



2. GOVT ACCESSION NO 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (and Subttlle) 



TIP VORTEX CAVITATION DELAY WITH APPLICATION 



TO MARINE LIFTING SURFACES 



A LITERATURE SURVEY 



5. TYPE OF REPORT ft PERIOD COVERED 



Research and Development 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORfJJ 



Gregory P. Platzer 

 William G. Souders 



8. CONTRACT OR GRANT NUMBERfsJ 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



David W. Taylor Naval Ship Research 

 and Development Center 

 Bethesda, Maryland 20084 



(See reverse side) 



n. CONTROLLING OFflCE NAME AND ADDRESS 



David W. Taylor Naval Ship Research 

 and Development Center 

 Bethesda, Maryland 20084 



12. REPORT DATE 



August 1979 



13. NUMBER OF PAGES 

 73 



14. MONITORING AGENCY NAME & ADOHESS(l I dl Iterant Irom Controlling Olllce) 



IS. SECURITY CLASS, (ol this report) 



UNCLASSIFIED 



16. DISTRIBUTION STATEMENT (ol Ihia Report) 



APPROVED FOR PUBLIC RELEASE: DISTRIBUTION UNLIMITED 



17. DISTRIBUTION STATEMENT (ot the abstract entered In Block 20, II dltteranl Irom Report) 



IB. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue i 



aide it neceaaary and identity by b/ock number) 



Tip Vortex Alleviation 



Tip Vortex Cavitation 



Tip Vortex Alleviation Concepts 



Performance 



Propeller 



Porous Tip 



Bulbous Tip 



Mass Injection Tip 



20. ABSTRACT (Continue on reverae aide It neceaaary and identity by block number) 



The generation of tip vortices from finite-span lifting surfaces degrades 

 the overall effectiveness of these surfaces. An extensive literature survey 

 pertaining to this viscous rollup phenomenon and the numerous concepts 

 advanced for its alleviation has been made. Those concepts which appear 

 applicable to delaying the formation of marine propeller tip vortex 

 cavitation are highlighted, and further experimental investigations are 

 recommended. 



DD ,:5 



EDITION OF 1 NOV 65 IS OBSOLETE 

 S/N 0102.LF-0I4-6601 



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