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The axisymmetric screech tones of round twin jets examined via linear stability theory.
- Source :
- Journal of Fluid Mechanics; 6/25/2023, Vol. 965, p1-29, 29p
- Publication Year :
- 2023
-
Abstract
- Spatial linear stability analysis is used to study the axisymmetric screech tones generated by twin converging round nozzles at low supersonic Mach numbers. Vortex-sheet and finite-thickness models allow for identification of the different waves supported by the flow at different conditions. Regions of the frequency-wavenumber domain for which the upstream-propagating guided jet modes are observed to be neutrally stable are observed to vary as a function of solution symmetry, jet separation, S, and the velocity profile used. Screech-frequency predictions performed using wavenumbers obtained from both models agree well with experimental data. Predictions obtained from the finite-thickness model better align with the screech tones measured experimentally and so are seen to be an improvement on predictions made with the vortex sheet. Additionally, results from the finite-thickness model predict both symmetric and antisymmetric screech tones for low S that are found in the vortex-sheet model only at greater S. The present results indicate that the feedback loop generating these screech tones is similar to that observed for single-jet resonance, with equivalent upstream and downstream modes. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00221120
- Volume :
- 965
- Database :
- Complementary Index
- Journal :
- Journal of Fluid Mechanics
- Publication Type :
- Academic Journal
- Accession number :
- 164955359
- Full Text :
- https://doi.org/10.1017/jfm.2023.398