SECURITY CLASSIFICATION OF THIS PAGE fWhar, Dttm Enffd) REPORT DOCUMENTATION PAGE READ INSTRUCTIONS BEFORE COMPLETING FORM ). REPORT NUMBER 85-14 2. OOVT ACCESSION NO 1. RECIPIENT'S CATALOG NUMBER 4. TITLE (mnd Subtitle) HUB EFFECTS IN PROPELLER DESIGN AND ANALYSIS B. TYPE OF REPORT » PERIOD COVERED TECHNICAL REPORT (. PERFORMING ORC. REPORT NUMBER 7. AUTHORf«J MO-HWA WANG t. CONTRACT OR GRANT NUMBERfiJ N00014-82-K-0198 9. PERFORMING ORGANIZATION NAME AND ADDRESS DEPARTMENT OF OCEAN ENGINEERING MASSACHUSETTS INSTITUTE OF TECHNOLOGY 77 MASSACHUSETTS AVENUE, CAMBRIDGE, MA 02139 10. PROGRAM ELEMENT, PROJECT, TASK AREA a WORK UNIT NUMBERS M. CONTROLLING OFFICE NAME AND ADDRESS OFFICE OF NAVAL RESEARCH DEPARTMENT OF THE NAVY ARLINGTON, VA 22217 12. REPORT DATE JULY 1985 13. NUMBER OF PAGES 191 14. MONITORING AGENCY NAME « ADDRESS'// ditlmrtnl Irom Controttlng Olllc*) 16. SECURITY CLASS, (ol Ihit report) UNCLASSIFIED tSa. DEC LASSIFIC ATI ON/DOWN GRADING SCHEDULE 16. DISTRIBUTION STATEMENT (ol Ihit Report) APPROVED FOR PUBLIC RELEASE: DISTRIBUTION UNLIMITED 17. DISTRIBUTION STATEMENT (ol the mbtlrect erytered In Block 30, It dlllerent from Report) 18. SUPPLEMENTARY NOTES 19. KEY WORDS (Continue on reverte elde II neceeemry mnd Identity by block number) PROPELLER HUB STEADY FLOW VORTEX LATTICE LASER DOPPLER ANEMOMETRY HUB VORTEX 20. ABSTRACT (Continue on reveree tide It neceeemry me\d identity by block number) A numerical model is established for the design of propeller blade shape for a prescribed circulation distribution and a given hub geometry. The vorte:x lattice approach is adapted for blades and their wakes. The hub is representec by a distribution of dipoles which ends at the hub apex. It is shown that con- sideration of the hub results in a lower pitch and lower camber at the inner radii. (continued) DD 1 JAN "73 1473 EDITION OF 1 NOV 65 IS OBSOLETE S/N 0102-OM- 6601 SECURITY CLASSIFICATION OF THIS PAGE (When Dele Entered)