Abstract
The dynamics of the vortex core are investigated in a swirling jet at swirl numbers in the range of the critical swirl number for vortex breakdown. Vortex breakdown, a bifurcation in the structure of a swirling jet, results in the establishment of a stagnation point and recirculation region along the centerline of the jet. In this study, we explore the dynamics of the swirling jet near vortex breakdown. Investigation of time-averaged velocity fields and profiles leads to the identification of three flow regimes: pre-breakdown, near-breakdown, and post-breakdown. Velocity fields in these regimes are further analyzed using dynamic mode decomposition, Rankine-vortex fitting, and proper orthogonal decomposition to characterize jet dynamics with a particular focus on the development of the recirculation region characteristic of vortex breakdown. A precessing vortex core is also identified in the post-breakdown regime and its behavior is discussed.
Original language | English (US) |
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Title of host publication | AIAA Aerospace Sciences Meeting |
Publisher | American Institute of Aeronautics and Astronautics Inc, AIAA |
Edition | 210059 |
ISBN (Print) | 9781624105241 |
DOIs | |
State | Published - Jan 1 2018 |
Event | AIAA Aerospace Sciences Meeting, 2018 - Kissimmee, United States Duration: Jan 8 2018 → Jan 12 2018 |
Other
Other | AIAA Aerospace Sciences Meeting, 2018 |
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Country | United States |
City | Kissimmee |
Period | 1/8/18 → 1/12/18 |
ASJC Scopus subject areas
- Aerospace Engineering