SUNMONTUEWEDTHUFRISAT
Events for the 1st week of April
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AME Seminar
Wed, Mar 31, 2021 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Joanna Austin, Caltech
Talk Title: Hypervelocity Spherically-Blunted Cone Flows in Mars Entry Ground Testing
Abstract: The intent to launch larger vehicles in future Mars missions increases the requirements for ground testing in the high-stagnation enthalpy environment encountered by the vehicle during the hypersonic phase of entry, descent and landing. During atmospheric entry, strong shock compression and high post-shock temperatures lead to significant chemical dissociation and vibrational excitation in the shock layer in front of a sphere-cone capsule, particularly near the stagnation region. For Mars missions, accurate thermochemical modeling of carbon dioxide, a principal component of the atmosphere with complex vibrational energy exchange, is particularly important. We examine the shock layer over sphere and spherically-blunted cone geometries through reacting Navier-Stokes simulations and experiments in two facilities capable of high-stagnation enthalpy, hypersonic flows simulating Mars planetary entry conditions: the T5 Reflected Shock Tunnel and the Hypervelocity Expansion Tube. A recently-developed unified model for sphere and sphere-cone behavior is first verified for high-stagnation enthalpy CO2 flows through simulations with thermal and chemical nonequilibrium. Shock standoff distance measurements in both facilities are in good agreement with model predictions. The need to account for the divergence of the streamlines in conical nozzles is highlighted and an existing model is extended to account for changes in shock curvature between parallel and conical flow. The contributions of vibrational and chemical nonequilibrium to the stagnation line density profile are quantified using the simulation results comparing three chemical kinetic models. Experimental measurement of fore- and aftbody MWIR radiation will also be discussed.
Biography: Joanna Austin is Professor of Aerospace at the Graduate Aerospace Laboratories, California Institute of Technology. She received B.E. (Mechanical and Space Engineering) and B.Sc. (Mathematics) degrees from the University of Queensland, Australia, and M.S. followed by Ph.D. (2003) degrees in Aeronautics from the California Institute of Technology. Austin then joined the faculty in the Aerospace Engineering department at the University of Illinois, becoming Associate Professor and Willett Faculty Scholar, before moving back to Caltech in 2014, where she is a co-PI in the Caltech Hypersonics Group. Austin's research is focused on fundamental problems in reactive, compressible flows across a broad range of applications including hypervelocity flight, supersonic combustion and detonation, bubble dynamics, and explosive geological events.
Host: AME Department
More Info: https://usc.zoom.us/j/99638511716
Webcast: https://usc.zoom.us/j/99638511716WebCast Link: https://usc.zoom.us/j/99638511716
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: https://usc.zoom.us/j/99638511716
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Advanced Manufacturing Seminar
Fri, Apr 02, 2021 @ 10:00 AM - 11:30 AM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Placid M. Ferreira, University of Illinois at Urbana-Champaign
Talk Title: Solid Ionics-Based Nanomanufacturing
Abstract: Mechanics and transport at the micro- and nanoscale offer a rich set of controllable phenomena that can be exploited for the development of manufacturing processes, compatible with these scales. Here, we exploit ionic transport in solids as the basis of highly controllable, efficient, high-resolution, high throughput nanomanufacturing processes for producing metallic (specifically silver and copper) nanostructures. This talk will focus on the exploitation of the high room-temperature ionic conductivity of silver and copper-based superionic glasses as the basis of subtractive and additive nano-manufacturing processes such as superionic imprinting/stamping, roll patterning and direct writing. Taking a traditional manufacturing perspective, the talk will discuss tooling and tool materials; process characterization and rates; and tool wear with such processes. Applications and future directions for solid ionics-based nanomanufacturing processes will also be discussed.
Biography: Dr. Placid M. Ferreira is the Tungchao Julia Lu Professor of Mechanical Science and Engineering at Illinois. From 2003 to 2009, he was the director of the Center for Chemical-Electrical-Mechanical Manufacturing Systems (Nano-CEMMS), an NSF-sponsored Nanoscale Science and Engineering Center after which he served as the Head of the Department of Mechanical Science and Engineering at Illinois until August 2015. He graduated with a PhD in Industrial Engineering from Purdue University in 1987, M.Tech (Mechanical) from IIT Bombay, 1982 and B.E. (Mechanical) for University of Bombay in 1980. He has been on the mechanical engineering faculty at Illinois since 1987, serving as the associate head for graduate programs and research from 1999 to 2002. Professor Ferreira's research and teaching interests are in precision manufacturing and includes computer-controlled machines, nano-manufacturing and metrology. Professor Ferreira received NSF's Presidential Young Investigator Award in 1990, SME's Outstanding Young Investigator Award in 1991, University of Illinois' University Scholar Award in 1994, the ASME Ennor Award for Manufacturing Technology in 2014. He is also a Fellow of ASME, SME and AAAS. He has served on the editorial board of a number of manufacturing-related journals.
Host: Center for Advanced Manufacturing
More Info: Please register for this webinar at: https://usc.zoom.us/webinar/register/WN_T8lmZM0nQhC8VeooLUjTaA
Webcast: Please register for this webinar at: https://usc.zoom.us/webinar/register/WN_T8lmZM0nQhC8VeooLUjTaAMore Information: Adv Mfg Seminar S21_Placid Ferreira.pdf
WebCast Link: Please register for this webinar at: https://usc.zoom.us/webinar/register/WN_T8lmZM0nQhC8VeooLUjTaA
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: Please register for this webinar at: https://usc.zoom.us/webinar/register/WN_T8lmZM0nQhC8VeooLUjTaA