Abstract
Direct numerical simulation of underexpanded supersonic circular cold jet at typical state issuing from sonic nozzle is carried out through solving axisymmetric Navier-Stokes equations directly. Near field screech tones of axisymmetric modes are investigated using POD analysis. The corresponding velocity field POD modes of the dominant coherent structures and the flow structures associated with screech tones are obtained respectively according to their energy and frequency. The energy variation along streamwise of the two kinds of flow structures and their spatial evolution are studied. Numerical results demonstrate that the interactions between shock-cell structures and jet shear layer occurring in the energy release sub-region of the screech-associated flow structures’ saturation region generate one or two kinds of axisymmetric \(\text {A}_{1}\) and \(\text {A}_{2}\) screech tone modes.
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Li, H., Luo, Y., Zhang, S. (2021). The POD Analysis of Screech Tone in Low Mach Number Axisymmetric Supersonic Jet. In: Braza, M., Hoarau, Y., Zhou, Y., Lucey, A.D., Huang, L., Stavroulakis, G.E. (eds) Fluid-Structure-Sound Interactions and Control. FSSIC 2019. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-33-4960-5_2
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DOI: https://doi.org/10.1007/978-981-33-4960-5_2
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