Abstract
High-speed shear flows are often characterized by some kind of aeroacoustic resonance phenomenon. Supersonic jets, particularly those that contain shock structures, produce high-intensity and discrete-frequency acoustic tones associated with an aeroacoustic feedback loop. While these jets and their associated resonances have been the subject of study for seventy years, our understanding of what physical mechanisms underpin the resonance has changed drastically in the past decade. In this talk, I will provide both a historical perspective on resonance in jets, as well as an overview of recent contributions from experiment, numerical simulation, and stability modelling, and how these techniques have combined to completely overturn our perception of aeroacoustic resonance. We will begin with the phased-array models of the 1950s and end with our current models based on triadic interaction, absolute instability, shock leakage, and the mysterious “guided-jet mode”.
Additionally, the talk will include a discussion of opportunities for postgraduate study in Australia supported by scholarships from the Australian Government, with the possibility of being co-supervised by an academic from U-M.
Bio
A/Prof. Daniel Edgington-Mitchell received his Ph.D. from Monash University in 2013, spending 18 months of his candidature working in the High-Temperature Gas-Dynamics Laboratory at Stanford via a Fulbright Fellowship. Daniel has worked on a range of topics in fluid mechanics: shock-tube diagnostics with Prof. Hanson at Stanford, asthma-puffer flows with the pharmaceutical industry and pressure-gain combustion with the Technical University of Berlin. His primary research focus is on the study of aeroacoustic resonance mechanisms in high-speed jets, using a combination of experimental techniques and reduced-order modeling. He is currently an Australian Research Council Future Fellow, focusing on resonance processes in rocket nozzles, and is also working with the US Office of Naval Research on resonance in rectangular jets. He serves as the Course Leader for Aerospace Engineering at Monash University and was the inaugural chair of the Faculty of Engineering Equity, Diversity, and Inclusivity committee.
