Abstract
This paper investigates the unsteady flow features of two-dimensional (2D) axisymmetric under-expanded supersonic impinging jet with a nozzle pressure ratio (NPR) of 3.5 and a distance ratio (z/D) of 2.5. A comparison between 2D axisymmetric, three-dimensional (3D) Large Eddy Simulation (LES) and experimental data is given. Good agreement can be seen in mean profiles and shock location data. Utilizing spectral and Proper Orthogonal Decomposition (POD) tools, two acoustic contributions of the 2D axisymmetric simulation are observed at the dominant tone frequency. The first one is responsible for acoustic waves propagating to the far field and the other one observed from the sides of the jet plume contributes to the feedback mechanism. Furthermore, the oscillation of the stand-off shock may be one of the triggers of the feedback mechanism of 2D axisymmetric simulation, which is consistent with Henderson and Powell’s hypothesis[4].
| Original language | English |
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| Title of host publication | Proceedings of the 21st Australasian Fluid Mechanics Conference |
| Editors | Timothy C.W. Lau, Richard M. Kelso |
| Publisher | Australasian Fluid Mechanics Society |
| ISBN (Electronic) | 9780646597843 |
| Publication status | Published - 2018 |
| Event | Australasian Fluid Mechanics Conference 2018 - Adelaide Convention Centre, Adelaide, Australia Duration: 10 Dec 2018 → 13 Dec 2018 Conference number: 21st https://aomevents.eventsair.com/QuickEventWebsitePortal/21st-australasian-fluid-mechanics-conference/afmc2018 |
Publication series
| Name | Proceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018 |
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Conference
| Conference | Australasian Fluid Mechanics Conference 2018 |
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| Abbreviated title | AFMC 2018 |
| Country | Australia |
| City | Adelaide |
| Period | 10/12/18 → 13/12/18 |
| Internet address |