You are invited to hear

Professor Emeritus of Aerospace and Ocean Engineering
Virginia Polytechnic Institute and State University

Montgomery Knight Rm 317, 11 a.m.  - 12 p.m.

Abstract

Recent advances in optics, photo detection, data acquisition hardware, and software provide opportunities to obtain low uncertainty time-dependent laser-Doppler velocimeter experimental data for high-speed turbulent flows, using only one access window. The innovation of using both parallel and diverging fringe patterns determines the particle position within 10 microns uncertainty and provides velocity profiles over a focal volume length. Small sub-micron seeding particles follow the high-speed turbulent eddies. A survey of applications of these advances to high-speed complex flows will be presented, including transonic, supersonic, and hypersonic flows. Miniature portable probe heads are being used inside wind tunnel models.  Galvanometer scanners have been used to survey large flow areas. 

About the speaker

BME, University of Virginia, 1964: MSME, 1965 and Ph.D., 1968, Stanford University. For 44 years at Southern Methodist University and Virginia Tech he developed and used experimental techniques such as laser-Doppler velocimetry for measurements of complex turbulent flows, such as various separated, wing-body junction, rough wall, and high-speed flows. His work includes over 50 government reports and 250 open literature publications and invited review articles on turbulent flows and their structure, separated flows, flow around buildings, laser-based measurement technologies, and several  restricted ONR reports on the control of turbulent flows.  He is a Fellow of AIAA and other professional societies and has served AIAA in a number of offices, including AIAA President (2005 – 2007) and Chair of the AIAA Foundation Board of Trustees (2008- 2009), as well as Chair of the American Association of Engineering Societies (2010).