AE Seminar

Some Aeroacoustic Issues in Model-Scale, Internally Mixed Jets

ft.

David Ramsey

GT-AE Post-Doctoral Fellow 

Thursday, October 17
3:30 - 4:30 p.m.
College of Computing, Room 102

About the Seminar: 
A re-commercialization of civil supersonic jet aircraft is on the horizon. These future aircraft will employ turbofan engines with lower bypass ratios than found on modern subsonic jets, which leads them to produce more thrust-specific jet noise. ‘Internally mixed’ exhaust systems may reduce this jet noise; however, experiments at the Georgia Tech Research Institute revealed that model-scale versions of these systems may produce unexpected aeroacoustic phenomena. These included a loud howling (acoustic tones which dominated over the typical, broadband jet noise) and other noise features tied to hydrodynamic instabilities. This seminar will outline some key findings, including theoretical results needed to interpret the experimental data.

About the Speaker: 
David (Nate) Ramsey began as a GT AE Post-Doctoral Fellow in September 2024, where he is conducting research in aeroacoustics and hypersonics as well as developing research experiences for undergraduates in collaboration with GTRI researchers. Nate earned his PhD in aerospace engineering from Georgia Tech where, as an NSF Graduate Research Fellow, he conducted experimental and theoretical research on issues in jet aeroacoustics under the advisement of Prof. Krish Ahuja. Nate also holds BS and MS degrees from the Georgia Tech School of Mechanical Engineering, where he conducted research on fluid-borne noise suppressors and completed an internship at BMW Group’s Research and Development Center in Munich where he researched structure-borne noise in automobiles.