Abstract
Impinging jets from a thin and infinite lipped nozzle at a Nozzle Pressure Ratio (NPR) of 3.4 and plate spacing of 5.0D are investigated. The dominant modes of the jets are studied using particle image velocimetry. First and second order statistics are generated for each flow to allow for a basic comparison. A peak in transverse variance at the shock cell locations is noted for the thin lip nozzle, but not for the infinite lip case. This is associated with the existence of a global asymmetric mode for the thin lip jet and an axisymmetric mode for the infinite lip nozzle. For the infinite lip jet, this correlates with a large region of high axial variance present at the standoff shock, which is indicative of an axisymmetric mode. This difference in modes is confirmed through proper orthogonal decomposition, which shows a dominant symmetric mode for the thin lip jet and an asymmetric mode for the infinite lip case. Using the high specific energy POD modes, triple decomposition is performed on the jet flows, allowing each high variance region to be associated with its respective dominant global mode for each of the jets.
| Original language | English |
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| Title of host publication | Proceedings of the 7th Australian Conference on Laser Diagnostics in Fluid Mechanics and Combustion |
| Editors | Damon Honnery, Daniel Edgington-Mitchell |
| Place of Publication | Clayton Victoria Australia |
| Publisher | Monash University Publishing |
| Pages | 167 - 172 |
| Number of pages | 6 |
| ISBN (Print) | 9780646948928 |
| Publication status | Published - 2015 |
| Event | Australian Conference on Laser Diagnostics in Fluid Mechanics and Combustion 2015 - Melbourne, Australia Duration: 9 Dec 2015 → 9 Dec 2015 Conference number: 7th |
Conference
| Conference | Australian Conference on Laser Diagnostics in Fluid Mechanics and Combustion 2015 |
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| Country/Territory | Australia |
| City | Melbourne |
| Period | 9/12/15 → 9/12/15 |