Active flow control of a precessing jet is the focus of this work. A round jet confined by a round cavity exhibits a self-excited rotational motion, precession, for a specific range of cavity lengths. Active flow control of this unstable flow provides the ability to control near-field mixing of the precessing jet. Twelve micro-jets on the periphery of the nozzle inlet are used as actuation and near-field pressure data is measured by four pressure probes at the chamber exit to monitor the flow behavior. A phase plane, based on pressure signals, is used to find a Reynolds number and actuation frequency range where actuation stabilizes the flow motion. Phase-locked stereoscopic PIV is also used to validate the pressure processing tool. The results confirm the pressure measurement and micro-jet actuation can be employed to develop a future closed-loop flow control on a precessing jet.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:AEU.10048/1636 |
| Date | 06 1900 |
| Creators | Babazadeh, Hamed |
| Contributors | Koch, Charles Robert (Mechanical Engineering), Nobes, David S. (Mechanical Engineering), Flynn, Morris R. (Mechanical Engineering), Kresta, Suzanne M. (Chemical and Materials Engineering) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | 148687749 bytes, application/pdf |
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