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REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1. REPORT NUMBER 



DTNSRDC-82/004 



2. GOVT ACCESSION NO 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (and Subtitle) 



A PRELIMINARY DESIGN THEORY FOR POLYPHASE 

 IMPELLERS IN UNBOUNDED FLOW 



5. TYPE OF REPORT & PERIOD COVERED 



Final 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORfsJ 



B. Yim 



B. CONTRACT OR GRANT NUMBERfsJ 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



David W. Taylor Naval Ship Research 



and Development Center 



Bethesda, Maryland 20084 



Task Area ZF43421001 

 Work Unit 1500-001 



1. CONTROLLING OFFICE NAME AND ADDRESS 



Naval Material Command 

 Washington, D.C. 20360 



12. REPORT DATE 



January 1982 



13. NUMBER OF PAGES 



27 



14. MONITORING AGENCY NAME a ADDRESSf/f dlllerent from Controlling Office) 



15. SECURITY CLASS, (of this report) 



UNCLASSIFIED 



16. DISTRIBUTION STATEMENT foflhis Repof!) 



APPROVED FOR PUBLIC RELEASE: DISTRIBUTION UNLIMITED 



17. DISTRIBUTION STATEMENT (of the abstract entered In Block 20, It different from Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue 



ssary and Identify by block number) 



Supercavita : taTi5_p_r^p_ell_ers, .cavitation^ cavitation number, 

 leading - edge cavity thickness, supercavitating cascades 



20. ABSTRACT (Continue on reverse aide It necessary and Identify by block number) 



The main role of preliminary design for supercavitating propellers is 

 to supply the basic data for the final design, such as: the hydrodynamic 

 pitch angle, the radial load distributions, the approximate cavity length 

 and the distribution of cavity-source strengths which will help determine 

 the three-dimensional cavity-source distribution. For this purpose, the 

 effective use of supercavitating cascade theory with lifting-line theory 



(Continued on reverse side) 



DD 1 JAN^73 1473 EDITION OF 1 NOV 65 IS OBSOLETE 



S/N 0102-LF-014-6601 



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