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- W2891954509 abstract "Experimental evidence is provided to demonstrate that the upstream-travelling waves in two jets screeching in the A1 and A2 modes are not free-stream acoustic waves, but rather waves with support within the jet. Proper orthogonal decomposition is used to educe the coherent fluctuations associated with jet screech from a set of randomly sampled velocity fields. A streamwise Fourier transform is then used to isolate components with positive and negative phase speeds. The component with negative phase speed is shown, by comparison with a vortex-sheet model, to resemble the upstream-travelling jet wave first studied by Tam & Hu ( J. Fluid Mech. , vol. 201, 1989, pp. 447–483). It is further demonstrated that screech tones are only observed over the frequency range where this upstream-travelling wave is propagative." @default.
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- W2891954509 date "2018-09-20" @default.
- W2891954509 modified "2023-10-17" @default.
- W2891954509 title "Upstream-travelling acoustic jet modes as a closure mechanism for screech" @default.
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- W2891954509 doi "https://doi.org/10.1017/jfm.2018.642" @default.
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