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Weekly Seminar: Spring 2018

Speaker : Prof. Thomas Juliano (University of Notre Dame)
Title:
"Flight & Quiet-Tunnel Measurements of Hypersonic Boundary-Layer Transition"
Hosted By: Tamer Zaki (ME)

Date: Friday, April 20, 2018
Time: 3:00 p.m.
Location: Gilman Hall # 132


Abstract

Understanding and predicting heating rates are crucial factors in the development of future high-speed flight vehicles.  HIFiRE-5 is a flight-test program, led by the U.S. Air Force Research Laboratory, designed to investigate the hypersonic aerothermodynamics of a three-dimensional geometry (in this case, an elliptic cone with a 2:1 aspect ratio).  The HIFiRE-5b flight vehicle was launched on a sounding rocket in 2016 and achieved a Mach number of 7.7 to 7.9 and freestream unit Reynolds number of 5*106 /m to 50*106 /m during descent.   A multi-lobed transition front was observed, with earliest transition at the centerline, on the leading edges, and part way in between.  It is suspected that a different mechanism is responsible for each of these lobes.  Although the centerpiece of the HIFiRE-5 program is the flight test, it also benefitted from pre- and post-flight computational analyses and wind-tunnel testing.  This talk will summarize highlights from the HIFiRE-5 program, focusing especially on the heat flux and boundary-layer transition measured in flight and in the Boeing/AFOSR Mach-6 Quiet Tunnel at Purdue University.

 

Bio

Thomas Juliano is an Assistant Professor in the Department of Aerospace and Mechanical Engineering at the University of Notre Dame.  Dr. Juliano’s primary research interest is in high-speed aerodynamics and aerothermodynamics.  His current projects include the design and construction of a large hypersonic quiet tunnel, plasma-actuated control of boundary-layer transition, improving heat-flux measurement techniques, and the analysis of hypersonic flight test data.

Previously, he was a National Academy of Sciences Research Associate in the Hypersonic Sciences Branch at the Air Force Research Laboratory and a post-doc at Ohio State University.  His M.S. and Ph.D. are from Purdue University and his B.S. is from Caltech.



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