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Graduate Seminar Series - Dr. Romain Buttay

Buttay,-Romain.pngRomain Buttay, Ph.D.

Aerospace and Mechanical Engineering Department, University of Arizona

Friday, February 24, 2023, 10:00 - 11:00 AM
In Person projection JH-109

Title: Highly under-expanded jets : a numerical analysis

ABSTRACT: High-speed jets may be found in a great deal of practical applications, especially in energy and propulsion systems. A few of these include the injection of gaseous fuel jets in a natural gas engine or a supersonic combustor, discharge of chimney gases into the atmosphere, and thrust control of rockets and V/STOL aircraft via jets. In most of these applications, an overall control of the fluid mechanics of the flow is required to improve the quality of the end process. Highly under-expanded jets releasing in the quiescent air atmosphere are studied using highly resolved numerical simulations accounting for complex multicomponent molecular transport phenomena. and turbulent scalar mixing. The seminar will present comparison between air and hydrogen jets, the influence of the molecular transport description and two inter-related issues : the closure of the mean scalar dissipation rate (SDR) and (ii) the turbulence–scalar interaction (TSI) term. The ignition processes in the turbulent reactive flow established downstream of highly under-expanded coflowing jets (configuration configuration is typical of a rocket engine igniter typical of a rocket engine igniter) will also be treated.

BIO: Dr. Romain Buttay earned his M.Sc. degrees in aerospace engineering at ISAE-ENSMA in Poitiers, France in 2011. He then joined the flame structure and turbulent combustion group at Institut Pprime/CNRS, where he received his Ph.D. in aerospace engineering in 2015. He spent 4 year in the Kingdom of Saudi Arabia as a postdoctoral fellowship working on flame propagation, wall-bounded compressible flow and turbulence. In 2019, he moved to Tucson to work on hypersonic boundary layer stability at the University of Arizona. His research interests comprise a wide range of topics in Aerospace Science from propulsion to external aerodynamics.