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- W2316965602 abstract "Large-eddy simulations (LES) of imperfectly expanded jet flows from a convergent- divergent nozzle with a sharp contraction at the nozzle throat have been carried out. The flow field and near-field acoustics for various total pressure ratios from over-expanded to under-expanded jet flow conditions have been investigated. Spacing of the shock cells and the length of the potential core are in good agreement with experimental data and previous theoretical results. The velocity profiles are also in good agreement with data from experimental measurements. A normal shock wave is observed for over-expanded jet cases with nozzle pressure ratios much lower than the fully expanded value. It is found that this type of nozzle with a sharp turning throat has no shock-free condition for supersonic jet flows. The near-field intensities of pressure fluctuations show wavy structures for cases where screech tones are observed. The LES predictions of the near-field noise intensities show very good agreement with those obtained from experimental measurements. This good agreement shows that LES and measurements can play complementary roles in the investigation of the noise generation from supersonic jet flows." @default.
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- W2316965602 date "2009-01-05" @default.
- W2316965602 modified "2023-09-26" @default.
- W2316965602 title "Large-Eddy Simulation of a Supersonic Jet and Its Near-Field Acoustic Properties - Methodology and Validation" @default.
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- W2316965602 doi "https://doi.org/10.2514/6.2009-500" @default.
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