REPORT DOCUMENTATION PAGE AFRL-SR-BL-TR-01- Public reporting burden for this collection of Information Is Mlimated to average 1 hour per response, Including the «me I the data needed, and completinfl and reviewing thl» collection of Information. Send comment» regarding mil burden e»t reducing »i» burden to Washington Headquarters Service», Directorate for Information Operation« and Report». 1215 J« Management and Budget, Paperwork Reduction Project (0704-0188). Waahington. DC 20503 id maintaining igestion« for the Office of 1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE July 31, 2001 3. REPORT'»,. c mu UAI6S COVERED Final report, 4/2000 - 4/2001 4. TITLE AND SUBTITLE PIV DIAGNOSTICS FOR FLOW CONTROL APPLICATIONS 6. AUTHOR(S) Peter Vorobieff and C. Randall Truman 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) The University of New Mexico Department of Mechanical Engineering 122 Redondo Drive NE Albuquerque, New Mexico 87131 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESSES, The Air Force Office of Scientific Research 801 N Randolph St Arlington, VA 22203-1977 FUNDING NUMBERS F49620-00-1-0186 8. PERFORMING ORGANIZATION REPORT NUMBER N/A 10. SPONSORING / MONITORING AGENCY REPORT NUMBER 11. SUPPLEMENTARY NOTES 12a. DISTRIBUTION / AVAILABILITY STATEMENT Approved for public release; distribution uallaltad. 12b. DISTRIBUTION CODE 13. ABSTRACT (Maximum 200 Words) We have developed a flexible instrumentation system for quantitative velocity-field measurement in a variety of experiments. The system integrates lasers, digital cameras, and a translation stage for PIV (particle image velocimetry) diagnostics. Several flows have already been investigated: the onset of vortex shedding in a water tow tank, development of a far wake in a water tow tank, Kelvin-Helmholtz instability in a wind tunnel, and a flow from a long crack in a pipe. Among the most important new results obtained with the experimental equipment provided by this grant is the following. We have determined the Reynolds number (i.e., critical velocity) at which the second wake (a regular pattern emerging in the far wake of a bluff body) is destroyed by turbulence. 20011005 137 14. SUBJECT TERMS 17. SECURITY CLASSIFICATION OF REPORT UNCLASSIFIED NSN 7540-01-28Q-S500 18. SECURITY CLASSIFICATION OF THIS PAGE UNCLASSIFIED 19. SECURITY CLASSIFICATION OF ABSTRACT UNCLASSIFIED 15. NUMBER OF PAGES 16. PRICE CODE 20. LIMITATION OF ABSTRACT SAR Standard Form 298 (Rev. 2-89) Praecribed by ANSI Std. Z3S-18 298-102