Abstract
The objective of this work is to study the initial development of structures in a three-dimensional precessing jet. To encourage the roll up of the jet shear layer, the inlet velocity profile is perturbed temporally by a sinusoidal disturbance. The frequency of the perturbation corresponds to the most amplified frequency of an axisymmetric jet, which is determined by two-dimensional numerical simulations. For a jet of Reynolds number 650, the maximally amplified frequency corresponded to a Strouhal number of approximately 0.39. Three dimensional numerical simulations were carried out to study the formation of structures in a precessing jet. The initial wariness of the shear layer and downstream propagation of structures could be observed. The rotating cross flow tends to deflect the structures azimuthally as they propagate downstream. Two kinds of structures were observed in a precessing jet. The fast kind is related to the roll up of the shear layer, and the other is related to the formation of a horseshoe type vortex which is seen in jets in cross flow. It was found that the former structures are considerably stronger than the latter.
| Original language | English (US) |
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| Title of host publication | American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED |
| Editors | Anon |
| Publisher | ASME |
| State | Published - 1998 |
| Event | Proceedings of the 1998 ASME Fluids Engineering Division Summer Meeting - Washington, DC, USA Duration: Jun 21 1998 → Jun 25 1998 |
Other
| Other | Proceedings of the 1998 ASME Fluids Engineering Division Summer Meeting |
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| City | Washington, DC, USA |
| Period | 6/21/98 → 6/25/98 |
All Science Journal Classification (ASJC) codes
- General Engineering