Measuring shear layer growth rates in aeroacoustically forced axisymmetric supersonic jets

Daniel Edgington-Mitchell, Daniel Duke, Omid Amili, Joel Weightman, Damon R. Honnery, Julio Soria

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


Underexpanded jets at a single pressure ratio and Reynolds number are studied in their free and impinging conditions. The influence of different kinds of aeroacoustic self-forcing is studied through Proper Orthogonal Decomposition and Dynamic Mode Decomposition analysis of high resolution Particle Image Velocimetry data. The free jet is primarily characterized by the presence of a strong helical instability, though a weaker axisymmetric instability is also present. The impinging jet shear layer is dominated by a fast-growing axisymmetric instability, with a weaker helical instability also evident. Ultra-high-speed schlieren imaging reveals a much more rapid instability growth close to the nozzle for the impinging jet case. Analysis of the streamwise growth rates via DMD suggests that the shear layer instability grows more than twice as fast in the near-nozzle region for the impinging jet. Further downstream the growth rate in the free jet case is higher.

Original languageEnglish (US)
Title of host publication21st AIAA/CEAS Aeroacoustics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103674
StatePublished - Jan 1 2015
Event21st AIAA/CEAS Aeroacoustics Conference, 2015 - Dallas, United States
Duration: Jun 22 2015Jun 26 2015

Publication series

Name21st AIAA/CEAS Aeroacoustics Conference


Other21st AIAA/CEAS Aeroacoustics Conference, 2015
Country/TerritoryUnited States


Dive into the research topics of 'Measuring shear layer growth rates in aeroacoustically forced axisymmetric supersonic jets'. Together they form a unique fingerprint.

Cite this